U.S. patent application number 09/046677 was filed with the patent office on 2003-01-23 for communication support system for providing security of telephone services of a data processing device for a telephone user.
Invention is credited to AZAMI, TOSHIHIRO, FURUKAWA, KIMIKAZU, KAKUTA, JUN, SATO, YASUO, TAKEBAYASHI, TOMOYOSHI, YANO, KATSUTOSHI.
Application Number | 20030016802 09/046677 |
Document ID | / |
Family ID | 17283775 |
Filed Date | 2003-01-23 |
United States Patent
Application |
20030016802 |
Kind Code |
A1 |
FURUKAWA, KIMIKAZU ; et
al. |
January 23, 2003 |
COMMUNICATION SUPPORT SYSTEM FOR PROVIDING SECURITY OF TELEPHONE
SERVICES OF A DATA PROCESSING DEVICE FOR A TELEPHONE USER
Abstract
A communication support system includes a command signal
recognition unit which discretely detects a command signal sent by
a telephone unit and a command signal sent from a telephone
network, and determines whether the command signal is from the
telephone unit, the command signal from the telephone unit
indicating one of a plurality of telephone services of a data
processing device. A signal transmission inhibition unit inhibits
transmission of a signal from the telephone unit to the telephone
network. A telephone service processing unit performs a telephone
service processing of the data processing device for the telephone
service indicated by the command signal from the telephone unit,
the telephone service processing unit starting execution of the
telephone service processing when the command signal recognition
unit determines that the command signal is from the telephone
unit.
Inventors: |
FURUKAWA, KIMIKAZU;
(KAWASAKI-SHI, JP) ; TAKEBAYASHI, TOMOYOSHI;
(KAWASAKI-SHI, JP) ; AZAMI, TOSHIHIRO;
(KAWASAKI-SHI, JP) ; YANO, KATSUTOSHI;
(KAWASAKI-SHI, JP) ; KAKUTA, JUN; (KAWASAKI-SHI,
JP) ; SATO, YASUO; (KAWASAKI-SHI, JP) |
Correspondence
Address: |
STAAS & HALSEY LLP
700 11TH STREET, NW
SUITE 500
WASHINGTON
DC
20001
US
|
Family ID: |
17283775 |
Appl. No.: |
09/046677 |
Filed: |
March 24, 1998 |
Current U.S.
Class: |
379/188 ;
379/207.02 |
Current CPC
Class: |
H04M 11/007 20130101;
H04M 1/82 20130101; H04M 1/652 20130101; H04M 1/656 20130101 |
Class at
Publication: |
379/188 ;
379/207.02 |
International
Class: |
H04M 003/00; H04M
003/42 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 19, 1997 |
JP |
9-255797 |
Claims
What is claimed is:
1. A communication support system which is adapted to connect a
telephone unit through a communication control device to a data
processing device and adapted to connect a telephone network to the
communication control device, the communication support system
comprising: a command signal recognition unit for discretely
detecting a command signal sent by the telephone unit and a command
signal sent from the telephone network, and for determining whether
the command signal is from the telephone unit, the command signal
from the telephone unit indicating one of a plurality of telephone
services of the data processing device; a signal transmission
inhibition unit for inhibiting transmission of a signal from the
telephone unit to the telephone network; and a telephone service
processing unit for performing a telephone service processing of
the data processing device for the telephone service indicated by
the command signal from the telephone unit, the telephone service
processing unit starting execution of the telephone service
processing when the command signal recognition unit determines that
the command signal is from the telephone unit.
2. The communication support system according to claim 1, wherein
the signal transmission inhibition unit comprises: a first
converter unit for separating a data signal sent from the telephone
network into a dual-tone multiple frequency signal and a voice
signal; a second converter unit for separating a data signal sent
by the telephone unit into a dual-tone multiple frequency signal
and a voice signal; and a switch provided on a connection line of
the first converter unit and the second converter unit for
switching on or off the connection line to selectively provide one
of connection of the telephone unit and the telephone network
through the switch and disconnection of the telephone network from
the telephone unit.
3. The communication support system according to claim 1, wherein
the command signal recognition unit detects a dual-tone multiple
frequency DTMF signal sent by the telephone unit, the command
signal recognition unit determining that the command signal is from
the telephone unit when said DTMF signal indicates one of a
plurality of defined values allocated to the plurality of telephone
services.
4. The communication support system according to claim 3, wherein
the command signal recognition unit detects a dual-tone multiple
frequency DTMF signal sent from the telephone network, the command
signal recognition unit distinguishing between the DTMF signal from
the telephone network and the DTMF signal from the telephone
unit.
5. The communication support system according to claim 3, wherein
the telephone service processing unit performs a telephone service
processing of the data processing device for the telephone service
indicated by the DTMF signal from the telephone unit.
6. The communication support system according to claim 1, wherein
the communication control device comprises a line switching unit
for selectively providing one of connection of the telephone unit
and the telephone network through the line switching unit and
disconnection of the telephone network from the telephone unit.
7. The communication support system according to claim 1, wherein
the command signal recognition unit comprises: a first DTMF
detection unit for detecting a dual-tone multiple frequency DTMF
signal sent from the telephone network; and a second DTMF detection
unit for detecting a dual-tone multiple frequency DTMF signal sent
by the telephone unit.
8. The communication support system according to claim 7, wherein
the communication control device comprises a DTMF generator unit
for generating a dual-tone multiple frequency DTMF signal based on
the DTMF signal sent by the telephone unit, the DTMF generator unit
transmitting the DTMF signal from the communication control device
to the telephone network before the transmission of a signal from
the telephone unit to the telephone network is inhibited by the
signal transmission inhibition unit.
9. The communication support system according to claim 1, wherein
the telephone service processing unit performs one of a voice
recording processing, a voice playback processing, a file
transmission processing and a telephone number entry processing
based on the telephone service indicated by the command signal from
the command signal recognition unit.
10. A communication control device adapted to connect a telephone
unit and a data processing device through the communication control
device and adapted to connect a telephone network to the
communication control device, comprising: a line switching unit for
selectively providing one of connection of the telephone unit and
the telephone network through the line switching unit and
disconnection of the telephone network from the telephone unit; a
command signal recognition unit for discretely detecting a command
signal sent by the telephone unit and a command signal sent from
the telephone network, and for determining whether the command
signal is from the telephone unit, the command signal from the
telephone unit indicating one of a plurality of telephone services
of the data processing device; and a signal transmission inhibition
unit for inhibiting transmission of a signal from the telephone
unit to the telephone network by controlling the line switching
unit.
11. The communication control device according to claim 10, wherein
the signal transmission inhibition unit comprises: a first
converter unit for separating a data signal sent from the telephone
network into a dual-tone multiple frequency signal and a voice
signal; a second converter unit for separating a data signal sent
by the telephone unit into a dual-tone multiple frequency signal
and a voice signal; and a switch provided on a connection line of
the first converter unit and the second converter unit for
switching on or off the connection line to selectively provide one
of connection of the telephone unit and the telephone network
through the switch and disconnection of the telephone network from
the telephone unit.
12. The communication control device according to claim 10, wherein
the command signal recognition unit detects a dual-tone multiple
frequency DTMF signal sent by the telephone unit, the command
signal recognition unit determining that the command signal from
the telephone unit is detected when said DTMF signal indicates one
of a plurality of defined values allocated to the plurality of
telephone services.
13. The communication control device according to claim 12, wherein
the command signal recognition unit detects a dual-tone multiple
frequency DTMF signal sent from the telephone network, the command
signal recognition unit distinguishing between the DTMF signal from
the telephone network and the DTMF signal from the telephone
unit.
14. The communication control device according to claim 10, wherein
the command signal recognition unit comprises: a first DTMF
detection unit for detecting a dual-tone multiple frequency DTMF
signal sent from the telephone network; and a second DTMF detection
unit for detecting a dual-tone multiple frequency DTMF signal sent
by the telephone unit.
15. The communication control device according to claim 14, further
comprising a DTMF generator unit for generating a dual-tone
multiple frequency DTMF signal based on the DTMF signal sent by the
telephone unit, the DTMF generator unit transmitting the DTMF
signal to the telephone network before the transmission of a signal
from the telephone unit to the telephone network is inhibited by
the signal transmission inhibition unit.
16. A method of executing a telephone service processing in a
communication support system which is adapted to connect a
telephone unit through a communication control device to a data
processing device and adapted to connect a telephone network to the
communication control device, the method comprising the steps of:
discretely detecting a command signal sent by the telephone unit
and a command signal sent from the telephone network; determining
whether the command signal is from the telephone unit, the command
signal from the telephone unit indicating one of a plurality of
telephone services of the data processing device; inhibiting
transmission of a signal from the telephone unit to the telephone
network; and starting execution of a telephone service processing
of the data processing device for the telephone service indicated
by the command signal from the telephone unit when it is determined
in said determining step that the command signal is from the
telephone unit.
17. A computer readable medium storing program code for causing a
processor to execute a telephone service processing in a
communication support system which is adapted to connect a
telephone unit through a communication control device to a data
processing device and adapted to connect a telephone network to the
communication control device, comprising: first program code means
for causing the processor to discretely detect a command signal
sent by the telephone unit and a command signal sent from the
telephone network; second program code means for causing the
processor to determine whether the command signal is from the
telephone unit, the command signal from the telephone unit
indicating one of a plurality of telephone services of the data
processing device; third program code means for causing the
processor to inhibit transmission of a signal from the telephone
unit to the telephone network; and fourth program code means for
causing the processor to start execution of a telephone service
processing of the data processing device for the telephone service
indicated by the command signal from the telephone unit when it is
determined by said third program code means that the command signal
is from the telephone unit.
Description
BACKGROUND OF THE INVENTION
[0001] (1) Field of the Invention
[0002] The present invention relates to a communication support
system which is adapted to connect a telephone unit through a
communication control device to a data processing device and
adapted to connect a telephone network to the communication control
device, when the user transmits a command signal from the telephone
unit to the data processing device to obtain a computer-assisted
telephone service from the data processing device. Further, the
present invention relates to a computer readable medium which
stores program code instructions for causing a processor to execute
a telephone service processing in response to a command signal sent
by the telephone unit.
[0003] Personal computers for home use are becoming widespread.
Modems have now been shrunk to a chip size, enhancing the
popularity in personal computers. The increasing prevalence of the
personal computers having a built-in modem makes it easier to
access the Internet or other communication networks through
telephone lines. In recent years, the telephone lines have been
shared by the computers and the telephones.
[0004] In recent developments, there is a demand for a useful,
advanced communication support system which enables a telephone
user to use a telephone unit to remotely control a personal
computer (or a data processing device) in order to obtain
computer-assisted telephone services. Currently, the
computer-assisted telephone services are provided only by locally
operating the data processing device, and the telephones and the
computers are separately used. Further, it is desired to provide a
communication support system which allows the telephone user to
easily transmit data to or receive data from other communication
media.
[0005] (2) Description of the Related Art
[0006] A conventional communication support system which provides
existing telephone services by executing an application program
installed in the system is known. The conventional communication
support system provides the telephone services only when the user
locally operates an input device (such as a keyboard or a mouse) of
a personal computer. That is, when one of the telephone services is
obtained from the conventional communication support system, the
user must be located in front of the personal computer and locally
operate the input device of the personal computer.
[0007] FIG. 20 shows such a conventional communication support
system.
[0008] As shown in FIG. 20, in the conventional communication
support system, an existing telephone unit 301, a data processing
device 304, and a line unit 303 are provided. The telephone unit
301 is connected through the line unit 303 to the data processing
device 304, and the telephone unit 301 is connected through the
line unit 303 to a telephone network 302. The data processing
device 304 is, for example, a personal computer. The telephone
network 302 is, for example, a public switched telephone
network.
[0009] In the above-described conventional system, a voice
input/output unit 305, a dialing unit 306 and a signal detection
unit 307 are connected to the line unit 303. Further, a
personal-computer (PC) interface unit 308 is provided between the
data processing device 304 and the units 305, 306 and 307.
[0010] The voice input/output unit 305 supplies a voice signal sent
from one of the telephone unit 301 and the telephone network 302,
to the data processing device 304 via the PC interface unit 308,
and supplies a voice signal derived from digital data stored in the
data processing device 304, to one of the telephone unit 301 and
the telephone network 302. The dialing unit 306 provides an
existing dialing function to transmit a call to a destination
terminal over the telephone network 302 according to a telephone
number input by an input device (such as a keyboard or a mouse) of
the data processing device 304. The signal detection unit 307
detects various signals sent from a telephone line, such as a busy
tone signal, a ring tone signal, a ring back tone signal, an
on-hook signal, and an off-hook signal.
[0011] In the above-described conventional system, telephone
services are provided by an existing telephone service application
program executed by the data processing device (or the personal
computer). Such telephone services include, for example, voice
recording and playback, file transmission, and telephone number
entry.
[0012] In the above-described conventional system, when a user of
the data processing device 304 sends a call to a destination
terminal in the telephone network 302, the application program
installed in the data processing device 304 is executed. The user
inputs the telephone number of the destination terminal and presses
a dialing button on a monitor of the data processing device 304 by
manipulating the keyboard or the mouse of the data processing
device 304. In this case, the user goes to the location of the
telephone unit 301 apart from the data processing device 304, and
lifts a handset of the telephone unit 301. Then the off-hook signal
from the telephone unit 301 is detected by the signal detection
unit 307. The telephone unit 301 is connected to the telephone
network 302 (or the destination terminal) by the line unit 303, and
this enables the user of the telephone unit 1 to communicate with a
person of the destination terminal over the telephone network 302
by voice.
[0013] However, in the above-described conventional system, it is
impossible for the telephone user to transmit a call to the
destination terminal in the telephone network 302 by using only the
telephone unit 301 to remotely control the application program in
the data processing device 304.
[0014] In the above-described conventional system, when a voice
recording function, as one of the telephone services, is obtained
by executing the application program in the data processing device
304, the user of the data processing device 304 presses a recording
start button on the monitor by operating the input device of the
data processing device 304. In this case, the data processing
device 304 acquires voice data from the telephone unit 301 or the
telephone network 302 through the voice input/output unit 305. The
application program in the data processing device 304 converts the
voice data into digital data in a computer-readable format and
stores the digital data in a memory of the data processing device
304. The application program continues to provide the voice
recording until a recording end button on the monitor is pressed by
the user.
[0015] However, in the above-described conventional system, it is
impossible for the telephone user to start the voice recording
processing by using the telephone unit 301 to remotely control the
application program in the data processing device 304.
[0016] In the above-described conventional system, when a playback
function, as one of the telephone services, is obtained by
executing the application program in the data processing device
304, the user of the data processing device 304 presses a playback
start button on the monitor by operating the input device. In this
case, the application program in the data processing device 304
converts the digital data stored in the memory of the device 304
into voice data, and supplies the voice data to the voice
input/output unit 305. A voice signal is derived from the voice
data by the voice input/output unit 305, and the voice signal is
supplied to the telephone unit 301 or the telephone network 302 via
the line unit 303. The application program continues to provide the
playback function until a playback end button on the monitor is
pressed by the user or the end of the data stored in the memory is
detected.
[0017] However, in the above-described conventional system, it is
impossible for the telephone user to start the playback processing
by using the telephone unit 301 to remotely control the application
program in the data processing device 304.
[0018] Further, in the above-described conventional system, when a
telephone number entry function, as one of the telephone services,
is obtained by executing the application program in the data
processing device 304, the user of the data processing device 304
inputs a telephone number by operating the input device. In this
case, the application program in the data processing device 304
stores the input telephone number in the memory. The application
program is executed to carry out the telephone number entry
processing when the user operates the keyboard or the mouse in
connection with the monitor in an interactive manner.
[0019] However, in the above-described conventional system, it is
impossible for the telephone user to start the telephone number
entry processing by using the telephone unit 301 to remotely
control the application program in the data processing device 304.
It is impossible for the conventional system to detect a telephone
number input by the telephone unit 301.
SUMMARY OF THE INVENTION
[0020] An object of the present invention is to provide an improved
communication support system in which the above-mentioned problems
are eliminated.
[0021] Another object of the present invention is to provide a
communication support system which enables a user of a telephone
unit to transmit a command signal to a communication control device
to obtain a telephone service from a data processing device while
inhibiting transmission of a signal from the telephone unit to the
telephone network when the data processing device is remotely
controlled by the telephone user.
[0022] Still another object of the present invention is to provide
a communication control device for a communication support system
including a telephone unit, a telephone network and a data
processing device, which enables a user of the telephone unit to
transmit a command signal to the communication control device to
obtain a telephone service from the data processing device while
inhibiting transmission of a signal from the telephone unit to the
telephone network when the data processing device is remotely
controlled by the telephone user.
[0023] A further object of the present invention is to provide a
method of executing a telephone service processing in a
communication support system, which enables a user of a telephone
unit to transmit a command signal to a communication control device
to obtain a telephone service from a data processing device while
inhibiting transmission of a signal from the telephone unit to a
telephone network when the data processing device is remotely
controlled by the telephone user.
[0024] Another object of the present invention is to provide a
computer readable medium storing program code instructions which
causes a processor to execute a telephone service processing in a
communication support system in response to a command signal sent
by a telephone unit while inhibiting transmission of a signal from
the telephone unit to a telephone network when a data processing
device is remotely controlled by the telephone user.
[0025] The above-mentioned objects of the present invention are
achieved by a communication support system adapted to connect a
telephone unit through a communication control device to a data
processing device and adapted to connect a telephone network to the
communication control device, the communication support system
comprising: a command signal recognition unit which discretely
detects a command signal sent by the telephone unit and a command
signal sent from the telephone network, and determines whether the
command signal from the telephone unit is detected, the command
signal from the telephone unit indicating one of a plurality of
telephone services of the data processing device; a signal
transmission inhibition unit which inhibits transmission of a
signal from the telephone unit to the telephone network; and a
telephone service processing unit which performs a telephone
service processing of the data processing device for the telephone
service indicated by the command signal from the telephone unit,
the telephone service processing unit starting execution of the
telephone service processing when the command signal recognition
unit determines that the command signal from the telephone unit is
detected.
[0026] The above-mentioned objects of the present invention are
achieved by a communication control device adapted to connect a
telephone unit and a data processing device through the
communication control device and adapted to connect a telephone
network to the communication control device, the communication
control device comprising: a line switching unit which selectively
provides one of connection of the telephone unit and the telephone
network through the line switching unit and disconnection of the
telephone network from the telephone unit; a command signal
recognition unit which discretely detects a command signal sent by
the telephone unit and a command signal sent from the telephone
network, and determines whether the command signal from the
telephone unit is detected, the command signal from the telephone
unit indicating one of a plurality of telephone services of the
data processing device; and a signal transmission inhibition unit
which inhibits transmission of a signal from the telephone unit to
the telephone network by controlling the line switching unit.
[0027] The above-mentioned objects of the present invention are
achieved by a method of executing a telephone service processing in
a communication support system which is adapted to connect a
telephone unit through a communication control device to a data
processing device and adapted to connect a telephone network to the
communication control device, the method comprising the steps of:
discretely detecting a command signal sent by the telephone unit
and a command signal sent from the telephone network; determining
whether the command signal from the telephone unit is detected, the
command signal from the telephone unit indicating one of a
plurality of telephone services of the data processing device;
inhibiting transmission of a signal from the telephone unit to the
telephone network; and starting execution of a telephone service
processing of the data processing device for the telephone service
indicated by the command signal from the telephone unit when it is
determined in said determining step that the command signal from
the telephone unit is detected.
[0028] The above-mentioned objects of the present invention are
achieved by a computer readable medium storing program code
instructions which cause a processor to execute a telephone service
processing in a communication support system adapted to connect a
telephone unit through a communication control device to a data
processing device and adapted to connect a telephone network to the
communication control device, the computer readable medium
comprising: a first program code unit which causes the processor to
discretely detect a command signal sent by the telephone unit and a
command signal sent from the telephone network; a second program
code unit which causes the processor to determine whether the
command signal from the telephone unit is detected, the command
signal from the telephone unit indicating one of a plurality of
telephone services of the data processing device; a third program
code unit which causes the processor to inhibit transmission of a
signal from the telephone unit to the telephone network; and a
fourth program code unit which causes the processor to start
execution of a telephone service processing of the data processing
device for the telephone service indicated by the command signal
from the telephone unit when it is determined by said third program
code means that the command signal from the telephone unit is
detected.
[0029] In the communication support system of the present
invention, it is possible for the telephone user to easily obtain a
computer-assisted telephone service from the data processing device
by transmitting a command signal from the telephone unit to the
communication control device regardless of whether a telephone call
between the telephone unit and the telephone network is in progress
or not. In the communication support system of the present
invention, the command signal recognition unit discretely detects a
command signal sent by the telephone unit and a command signal sent
from the telephone network, and the signal transmission inhibition
unit inhibits the transmission of a signal from the telephone unit
to the telephone network. Therefore, the communication support
system of the present invention can provide adequate security of
the telephone service of the data processing device for the
telephone user, and can safely prevent erroneous execution of the
telephone service processing of the data processing device as well
as erroneous execution of another processing of a remote system in
the telephone network.
[0030] The communication support system of the present invention
can correctly determine whether a command signal from the telephone
unit is locally supplied to the communication control device or a
command signal from the telephone network is remotely supplied. The
communication support system of the present invention allows the
telephone user to easily transmit data to or receive data from
other communication media such as the data processing device.
Further, the communication support system of the present invention
allows the telephone user to use a cordless telephone to remotely
control the data processing device. It is not necessary that the
user be located in front of the data processing device when
obtaining the computer-assisted telephone services from the
communication support system.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The above and other objects, features and advantages of the
present invention will be more apparent from the following detailed
description when read in conjunction with the accompanying drawings
in which:
[0032] FIG. 1 is a block diagram of a communication support system
of the present invention;
[0033] FIG. 2 is a diagram for explaining allocation of defined
values to DTMF command signals;
[0034] FIG. 3 is a diagram for explaining a construction of
elements of the communication support system;
[0035] FIG. 4 is a diagram for explaining another construction of
elements of the communication support system;
[0036] FIG. 5 is a diagram for explaining still another
construction of elements of the communication support system;
[0037] FIG. 6 is a diagram for explaining a further construction of
elements of the communication support system;
[0038] FIG. 7 is a diagram for explaining another construction of
elements of the communication support system;
[0039] FIG. 8 is a block diagram of one embodiment of the
communication control device in the communication support
system;
[0040] FIG. 9 is a flowchart for explaining a main routine of a
telephone service processing executed by a central processing unit
of the communication control device of FIG. 8;
[0041] FIG. 10 is a flowchart for explaining a PC interface
initialization in the main routine of FIG. 9;
[0042] FIG. 11 is a flowchart for explaining a CCD initialization
in the main routine of FIG. 9;
[0043] FIG. 12 is a flowchart for explaining a portion of a CCD
control processing routine in the main routine of FIG. 9;
[0044] FIG. 13 is a flowchart for explaining the remaining portion
of the CCD control processing routine;
[0045] FIG. 14 is a flowchart for explaining an on-hook processing
in the CCD control processing routine of FIGS. 12 and 13;
[0046] FIG. 15 is a flowchart for explaining a DTMF processing and
a DTMF notification in the CCD control processing routine of FIGS.
12 and 13;
[0047] FIG. 16 is a flowchart for explaining a defined value
comparison processing in the CCD control processing routine of
FIGS. 12 and 13;
[0048] FIG. 17 is a flowchart for explaining a coincidence
processing in the CCD control processing routine of FIGS. 12 and
13;
[0049] FIG. 18 is a flowchart for explaining an interrupt
processing executed by the central processing unit of the
communication control device of FIG. 8;
[0050] FIG. 19 is a flowchart for explaining a detection signal
reading in the CCD control processing routine of FIGS. 12 and 13;
and
[0051] FIG. 20 is a block diagram of a conventional communication
support system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0052] A description will now be given of the preferred embodiments
of the communication support system of the present invention with
reference to the accompanying drawings.
[0053] FIG. 1 shows a communication support system of the present
invention.
[0054] As shown in FIG. 1, the communication support system
generally has a telephone unit (TU) 1, a communication control
device (CCD) 2, a data processing device (DPD) 3, and a telephone
network (TN) 4. The communication support system is adapted to
connect the telephone unit 1 through the communication control
device 2 to the data processing device 3, and adapted to connect
the telephone network 4 to the communication control device 2.
[0055] The telephone unit 1 provides existing voice transmission
and reception functions and an existing dialing function. The
telephone network 4 is, for example, a public switched telephone
network.
[0056] The communication control device (CCD) 2 generally has a
line switching unit 5, a command signal recognition unit 6, and a
signal transmission inhibition unit 8. The line switching unit 5
selectively provides one of connection of the TU 1 and the TN 4
through the line switching unit 5 and disconnection of the TN 4
from the TU 1. Therefore, the communication control device (CCD) 2
selectively provides connection of the TU 1 to the TN 4 and
connection of the DPD 3 to the TN 4 through the line switching unit
5.
[0057] In the communication control device 2, the command signal
recognition unit 6 discretely detects a DTMF (dual-tone multiple
frequency) command signal sent by the TU 1 and a DTMF command
signal sent from the TN 4. The command signal recognition unit 6
determines whether the DTMF command signal is from the TU 1, the
DTMF command signal from the TU 1 indicating one of a plurality of
telephone services of the DPD 3. The signal transmission inhibition
unit 8 inhibits transmission of a DTMF signal from the TU 1 to the
TN 4 by controlling the line switching unit 5.
[0058] In the communication support system of FIG. 1, the data
processing device (DPD) 3 includes a telephone service processing
unit 7. The telephone service processing unit 7 performs a
telephone service processing of the DPD 3 for the telephone service
indicated by the DTMF command signal from the TU 1. The telephone
service processing unit 7 starts execution of the telephone service
processing when the command signal recognition unit 6 of the CCD 2
has determined that the DTMF command signal is from the TU 1.
[0059] In the communication support system of FIG. 1, when power is
not supplied to the CCD 2, the line switching unit 5 connects the
TU 1 and the TN 4. When power is supplied to the CCD 2, the line
switching unit 5 connects the TU 1 through the CCD 2 to the DPD 3
and disconnects the TN 4 from the CCD 2. At this time, the TU 1 is
connected through the line switching unit 5 to the signal
transmission inhibition unit 8. The command signal recognition unit
6 discretely detects a DTMF command signal sent by the TU 1 and a
DTMF command signal sent from the TN 4. The command signal
recognition unit 6 determines whether the DTMF command signal is
from the TU 1, the DTMF command signal from the TU 1 indicating one
of the plurality of telephone services of the DPD 3. When the DTMF
command signal from the TU 1 is detected, the command signal
recognition unit 6 notifies the telephone service processing unit 7
of the DPD 3 that the DTMF command signal from the TU 1 is detected
in the CCD 2. The telephone service processing unit 7 starts
execution of a telephone service processing of the DPD 3 for the
telephone service indicated by the DTMF command signal from the TU
1.
[0060] In the communication support system of FIG. 1, it is
possible for the telephone user to easily obtain a
computer-assisted telephone service from the DPD 3 by transmitting
a command signal from the TU 1 to the CCD 2 regardless of whether a
telephone call between the TU 1 and the TN 4 is in progress or not.
In the communication support system of the present invention, the
command signal recognition unit 6 discretely detects a command
signal sent by the TU 1 and a command signal sent from the TN 4,
and the signal transmission inhibition unit 8 inhibits the
transmission of a signal from the TU 1 to the TN 4. Therefore, the
communication support system of FIG. 1 can provide adequate
security of the telephone service of the DPD 3 for the telephone
user, and can safely prevent erroneous execution of the telephone
service processing of the DPD 3 as well as erroneous execution of
another processing of a remote system in the TN 4.
[0061] The communication support system of FIG. 1 can correctly
determine whether a command signal from the TU 1 is locally
supplied to the CCD 2 or a command signal from the TN 4 is remotely
supplied. The communication support system of FIG. 1 allows the
telephone user to easily transmit data to or receive data from
other communication media such as the DPD 3. Further, the
communication support system of FIG. 1 allows the telephone user to
use a cordless telephone to remotely control the DPD 3. It is not
necessary that the user be located in front of the DPD 3 when
obtaining the computer-assisted telephone services from the
communication support system.
[0062] FIG. 2 shows an allocation table in which defined values are
allocated to DTMF command signals which correspond to a plurality
of telephone services of the data processing device in the
communication support system of the present invention.
[0063] In the communication support system of the present
invention, a DTMF (dual-tone multiple frequency) pulse is used by
the telephone unit (TU) to transmit a command signal to the
communication control device (CCD). More specifically, as shown in
FIG. 2, defined values related to a ten-key pad ("0"-"9", "#"and
"*") of the telephone unit are allocated to a plurality of DTMF
command signals corresponding to the plurality of telephone
services of the data processing device (DPD). The defined values
may be suitably selected from those that are not ordinarily used to
indicate a telephone number of a destination terminal in the
telephone network. The defined values used by the communication
support system of the present invention include, for examples, "*1"
through "*4" and "*7" through "*9" as shown in FIG. 2.
[0064] According to the allocation table of FIG. 2, a DTMF command
signal sent by the telephone unit (TU) is detected by the
communication control device (CCD). The DTMF command signal
indicates a specific one of the plurality of telephone services. As
shown in FIG. 2, the plurality of telephone services provided by
the data processing device (DPD) in the communication support
system of the present invention include, for example, voice
recording start ("*1"), voice recording end ("*2"), voice playback
start ("*3"), voice playback end ("*4"), file transmission start
("*7"), file transmission end ("*8"), and telephone number entry
("*9"). In the communication control device (CCD), it is possible
to determine which of the plurality of telephone services is
indicated by the DTMF command signal sent by the telephone unit
(TU).
[0065] Alternatively, in a case in which a dial pulse is used by
the telephone unit 1 to transmit a command signal to the
communication control device 2, other defined values related to the
ten-key pad of the telephone unit 1 may be allocated to a plurality
of dial-pulse command signals instead of the example of FIG. 2. In
such a case, the plurality of dial-pulse command signals
respectively correspond to the plurality of telephone services.
[0066] In addition, in the case of the DTMF pulse used by the
telephone unit (TU) 1 to transmit a command signal to the
communication control device (CCD) 2, a plurality of
specifically-designed keys ("A", "B", . . . ) of the telephone unit
1 may be allocated to the plurality of DTMF command signals,
instead of the ten-key pad of the telephone unit 1. In such a case,
the plurality of specifically designed keys respectively correspond
to the plurality of telephone services.
[0067] In the communication support system of the present
invention, as shown in FIG. 1, the communication control device 2
may be considered a modem or a terminal adapter that connects both
the telephone unit 1 and the data processing device 3 to the
telephone network 4. FIG. 3 through FIG. 7 show various examples of
construction of the elements of the communication support system.
In the examples of FIGS. 3-7, a modem, a telephone system having a
built-in modem, and a personal computer having a built-in telephone
and modem are used to construct the communication support system of
the present invention.
[0068] The examples of FIG. 3 and FIG. 4 have a construction that
is essentially the same as the construction of the elements of the
communication support system of FIG. 1. In the examples of FIG. 3
and FIG. 4, a modem 41 is substituted for the communication control
device 2 in the communication support system of the present
invention. In the example of FIG. 4, the telephone unit 1 includes
a radio circuit 11 and a cordless telephone 12. The cordless
telephone 12 provides existing radio signal transmission and
reception functions at a remote location of the radio circuit 11.
The radio circuit 11 provides conversion of a radio signal from the
cordless telephone 12 into voice data and conversion of voice data
from the telephone line into a radio signal.
[0069] The example of FIG. 5 utilizes a telephone system 42 having
a built-in modem. In this example, the modem 41 contained in the
telephone system 42 is substituted for the communication control
device 2 in the communication support system of the present
invention.
[0070] The example of FIG. 6 utilizes a telephone system 43 having
a built-in modem. In the example of FIG. 6, the modem 41 contained
in the telephone system 43 is substituted for the communication
control device 2 in the communication support system of the present
invention. Also, the radio circuit 11 in the telephone system 43
forms a part of the communication control device 2, and the
cordless telephone 12 is substituted for the telephone unit 1.
[0071] The example of FIG. 7 utilizes a personal computer 44 having
a built-in telephone and a built-in modem. In the example of FIG.
7, the modem 41 and the data processing device 3, contained in the
personal computer 44, are substituted for the communication control
device 2 and the data processing device 3 in the communication
support system of the present invention. Also, the radio circuit 11
in the personal computer 44 forms a part of the communication
control device 2, and the cordless telephone 12 is substituted for
the telephone unit 1.
[0072] Next, FIG. 8 shows one embodiment of the communication
control device in the communication support system of the present
invention.
[0073] In the present embodiment, one of the telephone services,
including the voice recording and playback, file transmission and
telephone number entry, is provided when the user of the telephone
unit transmits a DTMF command signal from the telephone unit to the
communication control device to remotely control the data
processing device.
[0074] As shown in FIG. 8, the communication support system
generally has a telephone unit (TU) 101, a communication control
device (CCD) 200, a data processing device (DPD) 115, and a
telephone network (TN) 102. The communication support system is
adapted to connect the TU 101 through the CCD 200 to the DPD 115,
and adapted to connect the TN 102 to the CCD 200. A PC interface
unit (PC/I) 114 is provided between the CCD 200 and the DPD
115.
[0075] The CCD 200 in the present embodiment comprises a relay 103,
a relay control unit 104, a 2-line/4-line converter unit 105, a
2-line/4-line converter unit 106, a DTMF detection unit 107, a data
modulator/demodulator unit (DATA MODEM) 108, a DTMF detection unit
109, a signal detection unit 110, a DTMF generator unit 111, a
central processing unit (CPU) 112, a bus 113, a direct-current (DC)
detection unit 116, a direct-current (DC) detection unit 117, and a
switch (SW) 118.
[0076] In the above-described communication support system, the
execution of one of the telephone services, including voice
recording and playback, file transmission and telephone number
entry, is requested of the DPD 115 by the CCD 200 based on a
corresponding one of the plurality of DTMF command signals sent
from the telephone unit 101.
[0077] The TU 101 provides the existing voice signal transmission
and receiving functions and the existing dialing function. The TU
101 transmits a DTMF command signal to the CCD 200 to remotely
control the DPD 115. The TN 102 is, for example, a public switched
telephone network. The user of the TU 101 may communicate with a
person of a destination terminal over the TN 102 by voice.
[0078] The CPU 112 receives signals from the elements of the CCD
200 connected through the bus 113, performs control processing
based on the received signals, and controls the elements of the CCD
200. The DC detection unit 117 provides detection of an on-hook
condition of the TU 101. The DC detection unit 116 provides
detection of a disconnection of the TN 102 from the CCD 200.
[0079] In the CCD 200 of the present embodiment, a telephone
service processing related to the flowcharts of FIGS. 9-19 (which
will be described later) is program code instructions stored in a
memory (not shown) of the CCD 200. The memory of the CCD 200 is,
for example, a ROM (read-only memory). The memory corresponds to a
processor readable medium in the claims. The processor readable
medium may be any one of instruction storage devices, such as, for
example, magnetic disks including floppy disks, optical disks
including CD-ROMs, magneto-optical disks including MOs,
semiconductor memory cards, such as PC cards and miniature cards,
and other types of computer usable devices and media.
[0080] Further, in the present embodiment, the memory of the CCD
200 may store encoded or non-encoded instructions. The instructions
may be installed from a floppy disk (or a CD-ROM) to a hard disk
drive (not shown) of the CCD 200 first, transferred to a RAM (not
shown) of the CCD 200 and then read by the CPU 112. The memory of
the CCD 200 may store either all or a part of the instructions
related to the flowcharts of FIGS. 9-19.
[0081] The relay control unit 104 controls the relay 103 under the
control of the CPU 112. The relay 103 switches on or off a
connection line between the TU 101 and the TN 102 when the relay
103 is controlled by the relay control unit 104. In the present
embodiment, when power is supplied to place the CCD 200 in an
initial condition, the relay 103 is set in an off-state by the
relay control unit 104 so that the TU 101 is disconnected from the
TN 102. When a control signal from the CPU 112 is sent to the relay
control unit 104, or when power is not supplied to the CCD 200, the
relay 103 is set in an on-state by the relay control unit 104 so
that the TU 101 is connected to the TN 102 through the relay
103.
[0082] The 2-line/4-line converter unit 105 separates a data signal
sent from the TN 102 into a DTMF signal and a voice signal.
Similarly, the 2-line/4-line converter unit 106 separates a data
signal sent by the TU 101 into a DTMF signal and a voice signal.
Also, the 2-line/4-line converter unit 106 supplies power to the
CCD 200.
[0083] The DTMF detection unit 107 provides detection of a DTMF
signal sent by the TN 102. The DTMF detection unit 109 provides
detection of a DTMF signal (including the DTMF command signal) sent
by the TU 101. The DATA MODEM 108 provides modulation and
demodulation of the voice signal on the line from the TN 102 or the
line from the TU 101.
[0084] The signal detection unit 110 provides detection of various
signals sent from or to the telephone line (the TU 101 and the TN
102), the signals including a busy-tone signal, a ring-tone signal,
a ring-back-tone signal, an on-hook signal, and an off-hook signal.
The busy-tone signal, when detected by the signal detection unit
110, indicates that a telephone call between the TU 101 and the TN
102 is in progress. The ring-tone signal, when detected by the
signal detection unit 110, indicates that a call from a telephone
in the TN 102 is being received by the TU 101. The ring-back-tone
signal, when detected by the signal detection unit 110, indicates
that a telephone call from the TU 101 is being received by a
telephone in the TN 102.
[0085] The DTMF generator unit 111 generates a DTMF signal
(indicating a telephone number) under control of the CPU 112, and
transmits the DTMF signal from the CCD 200 to the TN 102.
[0086] The PC interface unit 114 provides a personal-computer
interface to connect the CCD 200 and the DPD 115. The DPD 115
provides execution of the telephone service processing in order to
provide the telephone service for the user of the TU 101.
[0087] The switch 118 switches on or off a connection line of the
converter unit 105 and the converter unit 106 under control of the
CPU 112, and switches on or off a connection line of the converter
unit 105 and the DTMF generator unit 111 under control of the CPU
112. When a telephone call between the TU 101 and the TN 102 is in
progress, the switch 118 switches on the connection line of the
converter unit 105 and the converter unit 106 in order to connect
the TU 101 and the TN 102, and switches off the connection line of
the converter unit 105 and the DTMF generator unit 111. When a DTMF
command signal from the TU 101 is detected, the switch 118 switches
off the connection line of the converter unit 105 and the converter
unit 106 in order to disconnect the TN 102 from the TU 101. When a
DTMF signal (indicating a telephone number) from the CCD 200 is
transmitted to the TN 102 in order to transmit a telephone call,
the switch 118 switches on the connection line of the converter
unit 105 and the DTMF generator unit 111 in order to connect the
DTMF generator unit 111 and the TN 102.
[0088] Next, a description will be given of an operation of the
communication support system of the above-described embodiment of
FIG. 8 when a telephone call between the TU 101 and the TN 102 is
not in progress.
[0089] In the communication support system of FIG. 8, when a
telephone call between the TU 101 and the TN 102 is not in
progress, the switch 118 is controlled by the CPU 112 so that the
switch 118 switches off the connection line of the converter unit
105 and the converter unit 106 to disconnect the TN 102 from the TU
101. At this time, in the communication support system of FIG. 8,
power is supplied to the CCD 200, and the relay 103 is set in the
off-state by the relay control unit 104.
[0090] When the communication support system of FIG. 8 is placed in
the above-mentioned condition, the user of the TU 101 transmits a
DTMF command signal from the TU 101 to the CCD 200 to remotely
control the DPD 115 and obtain a desired telephone service of the
DPD 115. In the CCD 200, the DTMF detection unit 109 detects the
DTMF command signal sent by the TU 101. The CPU 112 is notified
that the DTMF command signal from the TU 101 is detected by the
DTMF detection unit 109. Then, the CPU 112 notifies the DPD 115
that an event has occurred in the CCD 200 due to the DTMF command
signal sent by the TU 101.
[0091] When the DPD 115 is notified that the event has occurred due
to the DTMF command signal sent by the TU 101, a telephone service
application program provided in the DPD 115 is performed by the DPD
115 based on the content of the DTMF command signal, so that the
desired telephone service of the DPD 115 is provided for the user
of the TU 101.
[0092] In the communication support system of FIG. 8, the user of
the TU 101 presses either the ten-key pad or one of the
specifically-designed keys of the TU 101 to transmit a DTMF command
signal (indicating one of the defined values) to the DPD 115. Since
the DTMF command signal sent by the TU 101 indicates a specific one
of the defined values for the plurality of telephone services, it
is possible for the CCD 200 to distinguish the DTMF command signal
(indicating one of the defined values) from a different DTMF signal
(indicating a telephone number of a destination terminal).
Erroneous execution of the telephone service processing by the DPD
115 in response to the different DTMF signal can be avoided. It is
possible to provide the telephone service of the DPD 115 for the
telephone user when the telephone call between the TU 101 and the
TN 102 is not in progress and the telephone user transmits a DTMF
command signal from the TU 101 to remotely control the DPD 115.
[0093] On the other hand, in the communication support system of
FIG. 8, when the switch 118 is set in the off-state of the
connection line of the converter unit 105 and the converter unit
106, the user of the TU 101 transmits a DTMF signal (which
indicates a telephone number of a destination terminal and is
different from the DTMF command signal) through the CCD 200 to the
TN 102 in order to transmit a telephone call to a destination
terminal in the TN 102. At this time, the switch 118 is controlled
by the CPU 112 so that the switch 118 switches on the connection
line of the converter unit 105 and the DTMF generator unit 111 to
connect the DTMF generator unit 111 and the TN 102. The DTMF
generator unit 111 generates a DTMF signal based on the content of
the DTMF signal sent by the TU 101, and transmits the generated
DTMF signal from the CCD 200 to the TN 102. After the DTMF signal
(indicating the telephone number) is transmitted to the TN 102, the
DTMF generator unit 111 notifies the CPU 112 that the transmission
of the DTMF signal has ended. Then the switch 118 is controlled by
the CPU 112 so that the switch 118 switches off the connection line
of the converter unit 105 and the DTMF generator unit 111.
Therefore, the CPU 112 inhibits transmission of a DTMF signal from
the TU 101 to the TN 102.
[0094] In the communication support system of FIG. 8, the DTMF
detection unit 109 provides not only detection of a DTMF command
signal (indicating one of the defined values) sent by the TU 101
but also detection of a different DTMF signal (indicating a
telephone number) sent by the TU 101.
[0095] Next, a description will be given of an operation of the
communication support system of the above-described embodiment of
FIG. 8 when a telephone call between the TU 101 and the TN 102 is
in progress.
[0096] When the telephone call from the TU 101 is received by the
destination terminal in the TN 102, a ring-back-tone signal from
the TN 102 is sent to the CCD 200. In the CCD 200, the
ring-back-tone signal is detected by the signal detection unit 110.
The signal detection unit 110 notifies the CPU 112 that the
ring-back-tone signal from the TN 102 is detected. The switch 118
is controlled by the CPU 112 so that the switch 118 switches on the
connection line of the converter unit 105 and the converter unit
106 to connect the TN 102 and the TU 101. When the CCD 200 is
placed in this condition, the telephone call between the TU 101 and
the TN 102 is in progress and the user of the TU 101 can
communicate with a person of the destination terminal over the TN
102 by voice.
[0097] During the telephone call between the TU 101 and the TN 102,
the user of the TU 101 transmits a DTMF command signal from the TU
101 to the CCD 200, and the DTMF command signal from the TU 101 is
detected by the DTMF detection unit 109. The DTMF detection unit
109 notifies the CPU 112 that the DTMF command signal sent by the
TU 101 is detected. The switch 118 is controlled by the CPU 112 so
that the switch 118 switches off the connection line of the
converter unit 105 and the converter unit 106 to disconnect the TN
102 from the TU 101. Therefore, the CPU 112 inhibits transmission
of a DTMF signal from the TU 101 to the TN 102 through the switch
118. The CPU 112 notifies the DPD 115 that an event has occurred in
the CCD 200 due to the DTMF command signal sent by the TU 101.
[0098] When the DPD 115 is notified that the event has occurred due
to the DTMF command signal sent by the TU 101, a telephone service
processing program in the DPD 115 is executed by the DPD 115 based
on the content of the DTMF command signal, so that the desired
telephone service of the DPD 115 is provided for the user of the TU
101. Therefore, it is possible to provide the telephone service of
the DPD 115 for the telephone user even when the telephone call
between the TU 101 and the TN 102 is in progress and the telephone
user transmits a DTMF command signal from the TU 101 to remotely
control the DPD 115.
[0099] On the other hand, in the communication support system of
FIG. 8, when the telephone call between the TU 101 and the TN 102
is in progress, a person of the destination terminal in the TN 102
may transmit a DTMF command signal (or a different DTMF signal) to
the CCD 200. At this time, the DTMF signal from the TN 102 is
detected by the DTMF detection unit 107. The DTMF detection unit
107 notifies the CPU 112 that the DTMF signal sent from the TN 102
is detected. The CPU 112 notifies the DPD 115 that an event has
occurred in the CCD 200 due to the DTMF signal sent from the TN
102. The DPD 115 executes an invalid-access prevention processing
program (different from the telephone service processing program)
in the DPD 115 based on the content of the DTMF signal sent from
the TN 102, so that a warning message from the DPD 115 is provided
for the person of the destination terminal in the TN 102.
[0100] In the communication support system of FIG. 8, it is
possible to correctly distinguish between the DTMF signal
(indicating either one of the defined values or a telephone number)
from the TU 101 and a different DTMF signal from the TN 102.
Erroneous execution of the telephone service processing program by
the DPD 115 due to the different DTMF signal is avoided. It is
possible to provide adequate security of the telephone service of
the DPD 115 for the telephone user.
[0101] Next, FIG. 9 shows a main routine of a telephone service
processing program executed by the CPU 112 of the CCD 200 of FIG. 8
to remotely control the DPD 115 and obtain a desired telephone
service of the DPD 115. FIG. 10 shows a PC interface initialization
in the main routine of FIG. 9. FIG. 11 shows a CCD initialization
in the main routine of FIG. 9.
[0102] In the main routine of FIG. 9, power is supplied to the CCD
200 upon start-up, and the program code instructions, stored in the
memory of the CCD 200, cause the CPU 112 to perform an
initialization of the CCD 200 (S1). After the CCD initialization of
the above S1 is performed, the program code instructions cause the
CPU 112 to perform an initialization of the PC interface 114 (S2).
After the PC interface initialization of the above S2 is performed,
the program code instructions cause the CPU 112 to perform a CCD
control processing routine (S3) based on a signal sent by the TU
101, which will be described later.
[0103] As shown in FIG. 11, during the CCD initialization, the
program code instructions cause the CPU 112 to initialize all
internal flags of the CCD 200 (S11). After the initialization of
the internal flags of the above S11 is performed, the program code
instructions cause the CPU 112 to set the relay 103 in the on-state
by controlling the relay control unit 104 (S12). In this case, the
relay 103 switches on the connection line of the TU 101 and the TN
102 so that the TU 101 is connected through the CCD 200 to the TN
102. After the setting of the relay 103 of the above S12 is
performed, the CCD initialization of FIG. 11 is finished.
[0104] As shown in FIG. 10, during the PC interface initialization,
the program code instructions cause the CPU 112 to set a status
portion of the memory of the CCD 200 at a predetermined value
(S21). After the setting of the status portion of the above S21 is
performed, the program code instructions cause the CPU 112 to set a
data portion of the memory of the CCD 200 at "00" (S22). After the
setting of the data portion of the above S22 is performed, the
program code instructions cause the CPU 112 to set a data strobe
signal in an on-state (S23). After a given time period, the program
code instructions cause the CPU 112 to set the data strobe signal
in an off-state (S23). In this case, setting the status portion at
the predetermined value indicates that data is currently included
in the data portion of the memory. After the setting of the data
strobe signal of the above S23 is performed, the PC interface
initialization of FIG. 10 is finished.
[0105] As described above, in the CCD 200 of the communication
support system of FIG. 8, when power is supplied to place the CCD
200 in the initial condition, the relay 103 is set in the off-state
by the relay control unit 104 so that the TN 102 is disconnected
from the TU 101.
[0106] During the main routine of FIG. 9, the CPU 112 of the CCD
200 executes an interrupt processing routine in response to an
interrupt signal, and the execution of the interrupt processing
routine occurs simultaneously with the execution of the main
routine of FIG. 9. In the communication support system of the
present embodiment, the interrupt signal is supplied to the CPU 112
by either the DPD 115 or the CCD 200, which causes the interrupt
processing routine to be executed. In the CCD 200, the DTMF
detection unit 107, the DTMF detection unit 109, or the signal
detection unit 110 supplies a detection signal to the CPU 112 as
the interrupt signal which causes the execution of the interrupt
processing routine. The DPD 115 supplies a control command to the
CPU 112 as the interrupt signal which causes the execution of the
interrupt processing routine, and this control command includes a
defined value comparison mode setting command, a defined value
comparison mode resetting command, a DTMF command transmission
setting command, a secret number setting command, and a line
switching command.
[0107] FIG. 18 shows the interrupt processing routine executed by
the CPU 112 of the CCD 200.
[0108] As shown in FIG. 18, when an interrupt signal is received by
the CPU 112, the program code instructions cause the CPU 112 to
determine whether the interrupt has occurred due to a control
command sent by the DPD 115 (S161).
[0109] When the interrupt has occurred due to the control command
from the DPD 115 (the result of the above S161 is affirmative), the
program code instructions cause the CPU 112 to determine whether
the control command sent by the DPD 115 is a defined value
comparison mode setting command (S164). When the result of the
above S164 is affirmative, the program code instructions cause the
CPU 112 to set the CCD 200 in a defined value comparison mode
(S165). After the setting of the CCD 200 of the above S165 is
performed, the interrupt processing routine of FIG. 18 is
finished.
[0110] When the control command sent by the DPD 115 is not the
defined value comparison mode setting command (the result of the
above S164 is negative), the program code instructions cause the
CPU 200 to determine whether the control command is a defined value
comparison mode resetting command (S166). When the result of the
above S166 is affirmative, the program code instructions cause the
CPU 112 to set the CCD 200 in a non-comparison mode (S167). After
the setting of the CCD 200 of the above S167 is performed, the
interrupt processing routine of FIG. 18 is finished.
[0111] When the control command sent by the DPD 115 is not the
defined value comparison mode resetting command (the result of the
above S166 is negative), the program code instructions cause the
CPU 112 to determine whether the control command sent by the DPD
115 is a DTMF command transmission setting command (S168). When the
result of the above S168 is affirmative, the program code
instructions cause the CPU 112 to store the content of the DTMF
command signal in the memory of the CCD 200 (S169). When the DTMF
command transmission setting command is received, the CCD 200
transmits the content of the DTMF command signal, stored in the
memory of the CCD 200, to the DPD 115. After the storing of the
DTMF command signal of the above S169 is performed, the interrupt
processing routine of FIG. 18 is finished.
[0112] When the control command sent by the DPD 115 is not the DTMF
command transmission setting command (the result of the above S168
is negative), the program code instructions cause the CPU 200 to
determine whether the control command is a secret number setting
command (S170). When the result of the above S170 is affirmative,
the program code instructions cause the CPU 112 to store the
content of the control command in the memory of the CCD 200 as the
secret number (S171). After the storing of the secret number of the
above S171 is performed, the interrupt processing routine of FIG.
18 is finished.
[0113] When the control command sent by the DPD 115 is not the
secret number setting command (the result of the above S170 is
negative), the program code instructions cause the CPU 200 to
determine whether the control command is a line switching command
(S172). When the result of the above S172 is affirmative, the
program code instructions cause the CPU 112 to control the switch
118 so that the switch 118 switches on the connection line of the
converter unit 105 and the converter unit 106 to connect the TN 102
and the TU 101 (S173). After the above S173 is performed, the
program code instructions cause the CPU 112 to set a coincidence
processing end signal (S174). After the setting of the coincidence
processing end signal of the above S174 is performed, the interrupt
processing routine of FIG. 18 is finished.
[0114] When the command signal sent by the DPD 115 is none of the
above-mentioned commands (all the results of the above S164, S166,
S168, S170 and S172 are negative), the interrupt processing routine
of FIG. 18 is finished.
[0115] When the interrupt has occurred due to a signal other than
the control command from the DPD 115 (the result of the above S161
is negative), the program code instructions cause the CPU 112 to
determine whether the interrupt has occurred due to a detection
signal sent by one of the DTMF detection unit 107, the DTMF
detection unit 109, and the signal detection unit 110 (S162). When
the result of the above S162 is negative, the interrupt processing
routine of FIG. 18 is finished. When the result of the above S162
is affirmative, the program code instructions cause the CPU 112 to
store the content of the detection signal (or one of the DTMF
command signal, the busy-tone signal, the ring-tone signal,
ring-back-tone signal, the on-hook signal and the off-hook signal)
in the memory of the CCD 200 (S163). After the storing of the
detection signal of the above S163 is performed, the interrupt
processing routine of FIG. 18 is finished.
[0116] The DPD 115 provides execution of the telephone service
processing in order to provide the telephone service for the user
of the TU 101 based on a previous stored condition and the DTMF
command signal sent by the TU 101. The telephone service is, for
example, one of the voice recording, the voice playback, the file
transmission, and the telephone number entry.
[0117] When a detection signal from one of the DTMF detection unit
107, the DTMF detection unit 109, and the signal detection unit 110
is detected during the interrupt processing routine of FIG. 18, the
CPU 112 of the CCD 200 performs the CCD control processing routine
S3 in the main routine of FIG. 9.
[0118] FIG. 12 and FIG. 13 show the CCD control processing routine
S3 in the main routine of FIG. 9. As described above, the PC
interface initialization of FIG. 10 and the CCD initialization of
FIG. 11 are already performed. The program code instructions cause
the CPU 112 to perform the CCD control processing routine of FIGS.
12 and 13 when a detection signal from one of the units 107, 109
and 110 is detected during the interrupt processing routine of FIG.
18.
[0119] As shown in FIG. 12, the program code instructions cause the
CPU 112 to control the switch 118 so that the switch 118 switches
off the connection line of the converter unit 105 and the converter
unit 106 to disconnect the TN 102 from the TU 101 (S101). After the
above S101 is performed, the program code instructions cause the
CPU 112 to perform a detection signal reading (S102).
[0120] FIG. 19 shows the detection signal reading in the CCD
control processing routine of FIGS. 12 and 13.
[0121] As shown in FIG. 19, the program code instructions cause the
CPU 112 to read out the detection signal (which has been stored in
the above S163 in the interrupt processing of FIG. 18) from the
memory of the CCD 200 (S69). After the reading of the detection
signal of the above S69 is performed, the program code instructions
cause the CPU 112 to determine whether the detection signal can be
actually read out from the memory of the CCD 200 (S70). When the
result of the above S70 is negative, the detection signal reading
of FIG. 19 is finished.
[0122] When the result of the above S70 is affirmative, the program
code instructions cause the CPU 112 to initialize a corresponding
portion of the memory of the CCD 200 in which the detection signal
was stored during the interrupt processing of FIG. 18 (S71). After
the initialization of the above S71 is performed, the program code
instructions cause the CPU 112 to return a code indicating the
content of the detection signal read out in the above S69 (S72).
After the returning of the code of the above S72 is performed, the
detection signal reading of FIG. 19 is finished.
[0123] Referring back to FIGS. 12 and 13, after the detection
signal reading S102 is performed, the program code instructions
cause the CPU 112 to determine whether the off-hook signal is
indicated by the return code obtained by the detection signal
reading S102 (S103).
[0124] When the result of the above S103 is negative, the program
code instructions cause the CPU 112 to determine whether the
ring-tone signal is indicated by the return code obtained by the
detection signal reading S102 (S104).
[0125] When the result of the above S104 is negative, the program
code instructions cause the CPU 112 to return to the detection
signal reading of the above S102. The CPU 112 waits for a next
detection signal to be detected within the CCD 200 and read out
from the memory of the CCD 200 during the detection signal reading
of the above S102.
[0126] When the result of the above S104 is affirmative, the
program code instructions cause the CPU 112 to set a corresponding
portion of the memory of the CCD 200 at a predetermined value, the
predetermined value indicating that the ring-tone signal was
previously stored in the memory of the CCD 200 (S105). After the
above S105 is performed, the program code instructions cause the
CPU 112 to return to the detection signal reading of the above
S102. The CPU 112 waits for a next detection signal to be detected
within the CCD 200 and read out from the memory of the CCD 200
during the detection signal reading of the above S102.
[0127] When the result of the above S103 is affirmative, the
program code instructions cause the CPU 112 to determine whether
the predetermined value (indicating that the ring-tone signal was
previously stored in the memory of the CCD 200) is already set in
the corresponding portion of the memory of the CCD 200 (S106).
[0128] When the result of the above S106 is negative, the program
code instructions cause the CPU 112 to perform the detection signal
reading of FIG. 19 (S107). The CPU 112 waits for a next detection
signal to be detected within the CCD 200 and read out from the
memory of the CCD 200 during the detection signal reading of the
above S107. On the other hand, when the result of the above S106 is
affirmative, the program code instructions cause the CPU 112 to
delete the predetermined value (which has been stored in the above
S105) in the corresponding portion of the memory of the CCD 200
(S112). After the above S112 is performed, the program code
instructions cause the CPU 112 to control the switch 118 so that
the switch 118 switches on the connection line of the converter
unit 105 and the converter unit 106 to connect the TU 101 and the
TN 102 (S111).
[0129] After the control of the switch 118 of the above S111 is
performed, the program code instructions cause the CPU 112 to
perform the detection signal reading of FIG. 19 (S121) as shown in
FIGS. 12 and 13. The CPU 112 waits for a next detection signal to
be detected within the CCD 200 and read out from the memory of the
CCD 200 during the detection signal reading of the above S121.
[0130] After the detection signal reading of the above S107 is
performed, the program code instructions cause the CPU 112 to
determine whether the DTMF signal (which is locally sent by the TU
101 and detected by the DTMF detection unit 109) is indicated by
the return code obtained by the detection signal reading S107
(S108).
[0131] When the result of the above S108 is affirmative, the
program code instructions cause the CPU 112 to perform a DTMF
processing (S113). The DTMF processing will be described later with
reference to FIG. 15. After the DTMF processing of the above S113
is performed, the program code instructions cause the CPU 112 to
return to the detection signal reading of the above S107. The CPU
112 waits for a next detection signal to be detected within the CCD
200 and read out from the memory of the CCD 200 during the
detection signal reading of the above S107.
[0132] When the result of the above S108 is negative, the program
code instructions cause the CPU 112 to determine whether the
on-hook signal is indicated by the return code obtained by the
detection signal reading S107 (S109). When the result of the above
S109 is affirmative, the program code instructions cause the CPU
112 to perform an on-hook processing (S114). The on-hook processing
will be described later with reference to FIG. 14. After the
on-hook processing of the above S114 is performed, the program code
instructions cause the CPU 112 to return to the above S101.
[0133] When the result of the above S109 is negative, the program
code instructions cause the CPU 112 to determine whether the
ring-back-tone signal is indicated by the return code obtained by
the detection signal reading S107 (S110). When the result of the
above S110 is negative, the program code instructions cause the CPU
112 to return to the detection signal reading of the above S107.
The CPU 112 waits for a next detection signal to be detected within
the CCD 200 and read out from the memory of the CCD 200 during the
detection signal reading of the above S107.
[0134] When the result of the above S110 is affirmative, the
program code instructions cause the CPU 112 to perform the above
S111 in which the switch 118 is controlled by the CPU 112 so that
the switch 118 switches on the connection line of the converter
unit 105 and the converter unit 106 to connect the TU 101 and the
TN 102. After the control of the switch 118 of the above S111 is
performed, the program code instructions cause the CPU 112 to
perform the detection signal reading of the above S121. The CPU 112
waits for a next detection signal to be detected within the CCD 200
and read out from the memory of the CCD 200 during the detection
signal reading of the above S121.
[0135] Referring to FIG. 13, after the detection signal reading
S121 is performed, the program code instructions cause the CPU 112
to determine whether the on-hook signal is indicated by the return
code obtained by the detection signal reading S121 (S122). When the
result of the above S122 is affirmative, the program code
instructions cause the CPU 112 to perform the on-hook processing
(S133). The on-hook processing will be described later with
reference to FIG. 14. After the on-hook processing of the above
S133 is performed, the program code instructions cause the CPU 112
to return to the above S101.
[0136] When the result of the above S122 is negative, the program
code instructions cause the CPU 112 to determine whether the DTMF
signal (which is remotely sent from the TN 102 and detected by the
DTMF detection unit 107) is indicated by the return code obtained
by the detection signal reading S121 (S123).
[0137] When the result of the above S123 is affirmative, the
program code instructions cause the CPU 112 to perform a DTMF
notification (S124). The DTMF notification processing will be
described later with reference to FIG. 15. After the DTMF
notification processing of the above S124 is performed, the program
code instructions cause the CPU 112 to return to the detection
signal reading of the above S121. The CPU 112 waits for a next
detection signal to be detected within the CCD 200 and read out
from the memory of the CCD 200 during the detection signal reading
of the above S121.
[0138] When the result of the above S123 is negative, the program
code instructions cause the CPU 112 to determine whether the DTMF
signal (which is locally sent by the TU 101 and detected by the
DTMF detection unit 109) is indicated by the return code obtained
by the detection signal reading S121 (S125). When the result of the
above S125 is negative, the program code instructions cause the CPU
112 to return to the detection signal reading of the above S121.
The CPU 112 waits for a next detection signal to be detected within
the CCD 200 and read out from the memory of the CCD 200 during the
detection signal reading of the above S121.
[0139] When the result of the above S125 is affirmative, the
program code instructions cause the CPU 112 to determine whether
the CCD 200 is set in the defined value comparison mode (S126).
When the result of the above S126 is negative, the program code
instructions cause the CPU 112 to return to the detection signal
reading of the above S121. The CPU 112 waits for a next detection
signal to be detected within the CCD 200 and read out from the
memory of the CCD 200 during the detection signal reading of the
above S121.
[0140] When the result of the above S126 is affirmative, the
program code instructions cause the CPU 112 to perform a defined
value comparison processing (S127). The defined value comparison
processing will be described later with reference to FIG. 16. After
the defined value comparison processing of the above S127 is
performed, the program code instructions cause the CPU 112 to
determine whether the defined value comparison processing has
normally ended (S128).
[0141] When the result of the above S128 is negative, the program
code instructions cause the CPU 112 to perform the detection signal
reading of FIG. 19 (S129). The CPU 112 waits for a next detection
signal to be detected within the CCD 200 and read out from the
memory of the CCD 200 during the detection signal reading of the
above S129.
[0142] After the detection signal reading of the above S129 is
performed, the program code instructions cause the CPU 112 to
determine whether the DTMF signal (which is locally sent by the TU
101 and detected by the DTMF detection unit 109) is indicated by
the return code obtained by the detection signal reading S129
(S130).
[0143] When the result of the above S130 is affirmative, the
program code instructions cause the CPU 112 to return to the
defined value comparison processing of the above S127. The defined
value comparison processing will be described later with reference
to FIG. 16.
[0144] When the result of the above S130 is negative, the program
code instructions cause the CPU 112 to determine whether the
on-hook signal is indicated by the return code obtained by the
detection signal reading S129 (S131). When the result of the above
S131 is affirmative, the program code instructions cause the CPU
112 to perform the on-hook processing (S132). The on-hook
processing will be described later with reference to FIG. 14. After
the on-hook processing of the above S132 is performed, the program
code instructions cause the CPU 112 to return to the above
S101.
[0145] When the result of the above S131 is negative, the program
code instructions cause the CPU 112 to return to the defined value
comparison processing of the above S127.
[0146] On the other hand, when the result of the above S128 is
affirmative, the program code instructions cause the CPU 112 to
determine whether coincidence is indicated by a return code
obtained by the defined value comparison processing S127 (S134).
When the result of the above S134 is affirmative, the program code
instructions cause the CPU 112 to perform a coincidence processing
(S135). The coincidence processing will be described later with
reference to FIG. 17.
[0147] After the coincidence processing of the above S135 is
performed, the program code instructions cause the CPU 112 to
determine whether the off-hook signal is indicated by the return
code obtained during the coincidence processing S135 (S136). When
the result of the above S136 is affirmative, the program code
instructions cause the CPU 112 to return to the above S101. When
the result of the above S136 is negative, the program code
instructions cause the CPU 112 to return to the above S121. The CPU
112 waits for a next detection signal to be detected within the CCD
200 and read out from the memory of the CCD 200 during the
detection signal reading of the above S121.
[0148] When the result of the above S134 is negative, the program
code instructions cause the CPU 112 to perform the above S136, and
the above coincidence processing S135 is not performed.
[0149] FIG. 14 shows the on-hook processing in the CCD control
processing routine of FIGS. 12 and 13.
[0150] As described above, when it is determined during the CCD
control processing of FIGS. 12 and 13 that the on-hook signal is
detected, the on-hook processing of FIG. 14 is performed by the CPU
112 of the CCD 200. As shown in FIG. 14, the program code
instructions cause the CPU 112 to control the switch 118 so that
the switch 118 switches on the connection line of the converter
unit 105 and the converter unit 106 to connect the TU 101 and the
TN 102 (S141). After the control of the switch 118 of the above
S141 is performed, the program code instructions cause the CPU 112
to terminate the telephone call between the TU 101 and the TN 102.
That is, the telephone call between the TU 101 and the TN 102 is
finished. After the above S142 is performed, the program code
instructions cause the CPU 112 to return back to the CCD control
processing routine of FIGS. 12 and 13.
[0151] FIG. 15 shows the DTMF processing and the DTMF notification
in the CCD control processing routine of FIGS. 12 and 13.
[0152] As described above, when the CPU 112 is notified during the
CCD control processing of FIGS. 12 and 13 that the DTMF signal from
the TU 101 is detected by the DTMF detection unit 109, the DTMF
processing is performed by the CPU 112.
[0153] As shown in FIG. 15, the program code instructions cause the
CPU 112 to determine whether the content of the DTMF signal from
the TU 101 is included in the allocation table of FIG. 2 (S151).
When the result of the above S151 is negative, the program code
instructions cause the CPU 112 to control the switch 118 so that
the switch 118 switches on the connection line of the converter
unit 105 and the DTMF generator unit 111 to connect the DTMF
generator unit 111 to the TN 102 (S152). After the above S152 is
performed, the program code instructions cause the CPU 112 to
control the DTMF generator unit 111 so that the DTMF generator unit
111 generates a DTMF signal based on the content of the DTMF signal
sent by the TU 101, and transmits the DTMF signal to the TN 102
(S153). After the above S153 is performed, the program code
instructions cause the CPU 112 to control the switch 118 so that
the switch 118 switches off the connection line of the converter
unit 105 and the DTMF generator unit 111 to disconnect the DTMF
generator unit 111 from the TN 102 (S154). After the above S154 is
performed, the DTMF processing of FIG. 15 is finished. Therefore,
the CPU 112 inhibits transmission of a DTMF signal from the TU 101
to the TN 102 when the content of the DTMF signal from the TU 101
is not included in the allocation table containing the defines
values of the DTMF command signals for the plurality of telephone
services of the DPD 115.
[0154] When the result of the above S151 is affirmative, the
program code instructions cause the CPU 112 to set the status
portion of the memory of the CCD 200 at the predetermined value
(S155). After the setting of the status portion of the above S155
is performed, the program code instructions cause the CPU 112 to
set the data portion of the memory at a value indicated by the DTMF
signal from the TU 101 (or from the TN 102) (S156). After the
setting of the data portion of the above S156 is performed, the
program code instructions cause the CPU 112 to set the data strobe
signal in the on-state (S157). The DPD 115 is notified by the CCD
200 that the event has occurred due to the DTMF command signal sent
by the TU 101. After a given time period, the program code
instructions cause the CPU 112 to set the data strobe signal in the
off-state (S157). After the setting of the data strobe signal of
the above S157 is performed, the DTMF processing of FIG. 15 is
finished.
[0155] Further, as described above, when the CPU 112 is notified
during the CCD control processing of FIGS. 12 and 13 that the DTMF
signal from the TN 102 is detected by the DTMF detection unit 107,
the DTMF notification is performed by the CPU 112. During the DTMF
notification, the program code instructions cause the CPU 112 to
perform the above-mentioned steps S155-S157 as shown in FIG. 15.
Similarly, when the above S157 is performed by the CPU 112, the DPD
115 is notified by the CCD 200 that the event has occurred due to
the DTMF signal sent from the TN 102.
[0156] FIG. 16 shows the defined value comparison processing in the
CCD control processing routine of FIGS. 12 and 13.
[0157] As described above, during the CCD control processing of
FIGS. 12 and 13, the CPU 112 is notified that the DTMF signal from
the TU 101 is detected by the DTMF detection unit 109, and that the
CCD 200 is set in the defined value comparison mode, and then the
defined value comparison processing is performed by the CPU
112.
[0158] As shown in FIG. 16, the program code instructions cause the
CPU 112 to get the character (or the defined value) from the
defined value comparison mode setting command (S181). After the
above S181 is performed, the program code instructions cause the
CPU 112 to determine whether the content of the DTMF signal from
the TU 101 accords with the character of the defined value
comparison mode setting command (S182).
[0159] When the result of the above S182 is affirmative, the
program code instructions cause the CPU 112 to determine whether
the defined value comparison has normally ended (S183). When the
result of the above S183 is affirmative, the program code
instructions cause the CPU 112 to increment the comparison pointer
and returns a code indicating that the defined value comparison
yields coincidence and normal end (S184). After the above S184 is
performed, the defined value comparison processing of FIG. 16 is
finished.
[0160] When the result of the above S182 is negative, the program
code instructions cause the CPU 112 to initialize the comparison
pointer and returns a code indicating that the defined value
comparison yields non-coincidence (S185). After the above S185 is
performed, the defined value comparison processing of FIG. 16 is
finished. When the result of the above S183 is negative, the
program code instructions cause the CPU 112 to initialize the
comparison pointer and returns a code indicating that the defined
value comparison yields coincidence and abnormal end (S186). After
the above S186 is performed, the defined value comparison
processing of FIG. 16 is finished.
[0161] FIG. 17 shows the coincidence processing in the CCD control
processing routine of FIGS. 12 and 13.
[0162] As described above, during the CCD control processing of
FIGS. 12 and 13, the CPU 112 is notified that the return code
obtained by the defined value comparison processing indicates
coincidence, and then the coincidence processing is performed by
the CPU 112.
[0163] As shown in FIG. 17, the program code instructions cause the
CPU 112 to control the switch 118 so that the switch 118 switches
off the connection line of the converter unit 105 and the converter
unit 106 to disconnect the TN 102 from the TU 101 (S191). After the
above S191 is performed, the program code instructions cause the
CPU 112 to perform the detection signal reading of FIG. 19
(S192).
[0164] After the detection signal reading of the above S192 is
performed, the program code instructions cause the CPU 112 to
determine whether the on-hook signal is indicated by the return
code obtained by the detection signal reading (S193).
[0165] When the result of the above S193 is affirmative, the
program code instructions cause the CPU 112 to perform the on-hook
processing of FIG. 14 (S197). After the on-hook processing of the
above S197 is performed, the program code instructions cause the
CPU 112 to control the switch 118 so that the switch 118 switches
on the connection line of the converter unit 105 and the converter
unit 106 to connect the TU 101 and the TN 102 (S198). After the
above S198 is performed, the coincidence processing of FIG. 17 is
finished.
[0166] When the result of the above S193 is negative, the program
code instructions cause the CPU 112 to determine whether the DTMF
signal is indicated by the return code obtained by the detection
signal reading (S194).
[0167] When the result of the above S194 is affirmative, the
program code instructions cause the CPU 112 to determine whether
the end signal is detected (S195). When the result of the above
S195 is affirmative, the program code instructions cause the CPU
112 to perform the above S198. After the above S198 is performed,
the coincidence processing of FIG. 17 is finished.
[0168] When the result of the above S195 is negative, the program
code instructions cause the CPU 112 to perform the DTMF
notification of FIG. 15 (S196). After the above S196 is performed,
the program code instructions cause the CPU 112 to return to the
detection signal reading of the above S192.
[0169] On the other hand, when the result of the above S194 is
negative, the program code instructions cause the CPU 112 to return
to the detection signal reading of the above S192.
[0170] Further, the present invention is not limited to the
above-described embodiments, and variations and modifications may
be made without departing from the present invention.
* * * * *