U.S. patent number RE37,501 [Application Number 09/313,382] was granted by the patent office on 2002-01-08 for apparatus and method for displaying caption broadcast and teletext on the screen of a double-wide television.
This patent grant is currently assigned to Samsung Electronics Co., Ltd.. Invention is credited to Kwon-Eui Song.
United States Patent |
RE37,501 |
Song |
January 8, 2002 |
Apparatus and method for displaying caption broadcast and teletext
on the screen of a double-wide television
Abstract
An apparatus and method for displaying a caption broadcast and
teletext on a wide screen of a double-wide television are provided
in which a televised picture and a caption broadcast or teletext
are separately displayed without any overlap. The apparatus
includes first and second comb filters for converting first and
second broadcast signals into luminance (Y) and chrominance (C)
signals. The apparatus also includes a signal separating circuit
for separating a second video signal output from the first comb
filter into a first picture signal and caption and teletext
signals, a switching circuit for selectively outputting a first
video signal output from the first comb filter and the caption and
teletext signals output from the signal separating circuit, a
double-picture processing circuit for processing the first picture
signal output from the signal separation circuit and the caption
and teletext signals output from the switching circuit so that
pictures corresponding to the first picture signal and the caption
and teletext signals can be displayed in left and right portions of
the wide screen, respectively.
Inventors: |
Song; Kwon-Eui (Suwon,
KR) |
Assignee: |
Samsung Electronics Co., Ltd.
(Kyungki-do, KR)
|
Family
ID: |
19415629 |
Appl.
No.: |
09/313,382 |
Filed: |
May 18, 1999 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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Reissue of: |
647662 |
May 15, 1996 |
05757437 |
May 26, 1998 |
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Foreign Application Priority Data
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May 27, 1995 [KR] |
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95-13548 |
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Current U.S.
Class: |
348/564;
348/468 |
Current CPC
Class: |
H04N
21/4884 (20130101); H04N 21/4316 (20130101); H04N
21/4888 (20130101); H04N 21/4312 (20130101); H04N
21/435 (20130101); H04N 21/47 (20130101); H04N
7/0122 (20130101); H04N 21/4263 (20130101) |
Current International
Class: |
H04N
5/445 (20060101); H04N 5/44 (20060101); H04N
005/445 () |
Field of
Search: |
;348/564,468,588,563,556,553,739,445 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Kostak; Victor R.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak &
Seas, PLLC
Claims
What is claimed is:
1. An apparatus for displaying a caption broadcast and teletext on
a wide-screen of a double-wide television that separates first and
second broadcast signals, including video information and caption
and teletext information, into luminance (Y) and chrominance (C)
signals using first and second comb filters which output said first
and second broadcast signals, said apparatus comprising:
a signal separating circuit for separating a second video signal
output from said second comb filter into a first picture signal and
caption and teletext signals;
a switching circuit for selectively outputting a first video signal
output from said first comb filter and said caption and teletext
signals output from said signal separating circuit;
a double-picture processing circuit for processing said first
picture signal output by said signal separation circuit and said
caption and teletext signals output from said switching circuit so
that pictures corresponding to said first picture signal and said
caption and teletext signals can be displayed without overlap in
left and right portions of said wide-screen respectively;
a controller for controlling said signal separating circuit to
separate said second video signal into said first picture signal
and said caption and teletext signals according to a key input,
controlling said switching circuit to selectively output said first
video signal output from said first comb filter and said caption
and teletext signals output from said signal separating circuit and
controlling said double-picture processing circuit;
a matrix circuit for converting a third video signal output from
said double-picture processing circuit, having first and second
luminance and chrominance components, into a fourth video signal
having RGB components; and
a CRT driver for driving a CRT using said fourth video signal
having RGB components.
2. The apparatus defined in claim 1, further comprising a
television signal receiver which produces said first and second
broadcast signals from a carrier wave and outputs said first and
second broadcast signals to said first and second comb filters,
respectively.
3. The apparatus defined in claim 2, further comprising an antenna
for receiving said carrier wave.
4. The apparatus defined in claim 2, further comprising an audio
signal processor for processing audio information included in said
first and second broadcast signals output by said television signal
receiver and outputting right and left channel audio signals.
5. The apparatus defined in claim 4, further comprising first and
second audio speakers which output soundwaves in response to said
right and left channel audio signals, respectively.
6. The apparatus defined in claim 1, wherein the controller
comprises a microcomputer.
7. The apparatus defined in claim 1, further comprising a key input
device into which said key input is entered.
8. The apparatus defined in claim 5, further comprising a key input
device into which said key input is entered.
9. A method for displaying a caption broadcast and teletext on a
wide-screen of a double-wide television, comprising the steps
of:
(a) displaying a picture corresponding to a broadcast signal
including caption and teletext signals on said wide-screen of said
double-wide television;
(b) segmenting said wide-screen into at least two distinct portions
if it is determined that a caption key is selected so that a
caption display mode is initiated;
(c) displaying without overlap a televised picture in one of said
at least two distinct portions and a picture corresponding to said
caption broadcast signal in another one of said at least two
distinct portions segmented in said step (b).
10. The method defined in claim 9 further comprising the step of
converting said caption display mode into a teletext display mode
if the caption key is selected during said step of displaying a
televised picture in one of at least two distinct portions so that
a picture corresponding to said teletext signal is displayed in
said another one of said at least two distinct portions.
11. The method defined in claim 10 further comprising the step of
returning to said step of displaying a picture corresponding to a
broadcast signal if the caption key is selected again when said
teletext signal is displayed in said another one of said at least
two distinct portions..Iadd.
12. A method for displaying a video signal and a text signal on a
wide screen of a double.Iaddend.-.Iadd.wide television, comprising
the steps of:.Iaddend.
.Iadd.(a) displaying a picture corresponding to said video signal
on said wide screen of said television; .Iaddend.
.Iadd.(b) segmenting said wide screen into at least two distinct
portions; .Iaddend.
.Iadd.(c) displaying without overlap said picture corresponding to
said video signal in one of said distinct portions and a picture
corresponding to said text signal in another one of said at least
two distinct portions segmented in said step
(b)..Iaddend..Iadd.
13. The method as claimed in claim 12 wherein said segmenting step
is activated by a user controlled switch..Iaddend..Iadd.
14. The method as claimed in claim 13 wherein a consecutive
actuation of said switch initiates consecutive displaying of a
plurality of different types of said text
signal..Iaddend..Iadd.
15. The method as claimed in claim 14 wherein said different types
of said text signal comprises of teletext or
caption..Iaddend..Iadd.
16. The method as claimed in claim 13 wherein after said switch is
actuated a predetermined number of times, said displaying step (c)
is terminated..Iaddend..Iadd.
17. The method as claimed in claim 12 wherein said video signal is
a broadcast signal..Iaddend..Iadd.
18. The method as claimed in claim 17 wherein said video signal and
said text signal is received by said television in a single
broadcast channel..Iaddend..Iadd.
19. The method as claimed in claim 18 further comprising the step
of separating said text signal from said video
signal..Iaddend..Iadd.
20. The method as claimed in claim 12 wherein said text signal
contains supplemental information having a predetermined
relationship to said video signal..Iaddend..Iadd.
21. The method as claimed in claim 12 wherein said text signal
contains information which have no relationship to said video
signal..Iaddend..Iadd.
22. A method for displaying a video signal and a text signal on a
wide screen of a double-picture display television, comprising the
steps of:
(a) receiving the video signal and the text signal;
(b) segmenting said wide screen into at least two distinct
portions;
(c) displaying without overlap a picture corresponding to said
video signal in one of said at least two distinct portions
segmented in said step (b) and a picture corresponding to said text
signal in another one of said at least two distinct portions
segmented in said step (b)..Iaddend.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus and method for
displaying a caption broadcast and teletext on the screen of a
double-wide television, and more particularly, to an apparatus and
method for displaying a caption broadcast and teletext on the
screen of a double-wide television in which a televised picture can
be displayed concurrently with a separate caption broadcast picture
or teletext picture.
2. Description of Prior Art
When using a conventional television including a remote controller
having a key panel which incorporates a caption button, if the
caption button is selected by a user while a broadcast including
caption and teletext signals is being received, caption information
will be displayed over a televised picture. Also, if the key panel
of the remote controller includes a teletext button which is
selected by a user, a blanking-processed teletext signal block will
be displayed over the televised picture.
Thus, when viewing a current broadcast having caption and teletext
signals on a conventional television, the caption broadcast picture
of teletext picture will overlap the televised picture, so that the
televised picture is partially obscured.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus
and method for displaying a caption broadcast and teletext on the
screen of a double-wide television in which a televised picture can
be displayed concurrently with the caption broadcast or teletext
picture without their being any overlap between the pictures.
According to one embodiment of the invention, there is provided an
apparatus for displaying a caption broadcast and teletext on the
wide screen of a double-wide television. The apparatus separates
first and second broadcast signals including a video signal and
caption and teletext signals into luminance (Y) and chrominance (C)
signals using first and second comb filters which output said first
and second broadcast signals. The apparatus includes a signal
separating circuit for separating a second video signal output from
the second comb filter into a first picture signal and caption and
teletext signals.
The apparatus also includes a switching circuit for selectively
outputting a first video signal output from the first comb filter
and the caption and teletext signals output from the signal
separating circuit. Additionally, a double-picture processing
circuit is included in the apparatus for processing the first
picture signal output by the signal separation circuit and the
caption and teletext signals output from the switching circuit so
that pictures corresponding to the first picture signal and the
caption and teletext signals can be displayed on corresponding left
and right portions of the wide screen, respectively.
A controller is also included in the apparatus for controlling the
signal separating circuit to separate the second video signal into
the first picture signal and the caption and teletext signals
according to a key input, controlling the switching circuit to
selectively output the first video signal output from the first
comb filter and the caption and teletext signals output from the
signal separating circuit and controlling the double-picture
processing circuit. A matrix circuit included in the apparatus
converts a third video signal output from the double-picture
processing circuit having first and second luminance and
chrominance components, into a fourth video signal having RGB
components. A CRT driver circuit is also included in the apparatus
for driving a CRT using the fourth video signal having RGB
components.
According to another embodiment of the invention there is provided
a method for displaying a caption broadcast and teletext on the
wide screen of a double-wide television. The method comprises the
steps of displaying a picture corresponding to a broadcast signal
including caption and teletext signals on the wide screen of a
double-wide television and segmenting the wide-screen into at least
two distinct portions if it is determined that a caption key is
selected so that a caption display mode is initiated.
The method also includes the step of displaying a televised picture
in one of the at least two distinct portions and a picture
corresponding to the caption broadcast signal in another one of the
at least two distinct portions segmented in the segmenting
step.
According to another aspect of the present invention, the method
may also include the step of converting the caption display mode
into a teletext display mode if the caption key is selected during
the step of displaying a televised picture in one of the at least
two portions so that a picture corresponding to the teletext signal
is displayed in the another one of the at least two distinct
portions.
According to yet another aspect of the present invention, the
method may also include the step of displaying a picture
corresponding to a broadcast signal if the caption key is selected
when the picture corresponding to the teletext signal is displayed
in the another one of the at least two distinct portions.
BRIEF DESCRIPTION OF THE DRAWINGS
The above objects and advantages of the present invention will
become more apparent by describing in detail a preferred embodiment
thereof with reference to the attached drawings in which:
FIG. 1 is a block diagram of an apparatus for displaying a caption
broadcast and teletext on the wide screen of a double-wide
television according to one embodiment of the present invention;
and
FIG. 2 is a flowchart illustrating a method for displaying a
caption broadcast and teletext on the screen of a double-wide
television according to another embodiment of the present
invention.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, an exemplary apparatus for displaying a caption
broadcast and teletext on the screen of a double-wide television
according to one embodiment of the present invention includes a
television signal receiver 20, an audio signal processor 70, left
(L) and right (R) speakers 72 and 74, a microcomputer 71, a video
signal processor 30, a matrix portion 40, a cathode-ray tube (CRT)
driver 50 and a CRT 60.
The television signal receiver 20 includes first and second tuners
21 and 22 for converting a carrier wave introduced via an antenna
10 into an intermediate-frequency signal, and first and second
demodulators 23 and 24 for demodulating video and audio signals
from the intermediate-frequency signal. The audio signal processor
70 processes the audio signal output from the first and second
demodulators 23 and 24 and then outputs the result to left and
right channels. The left (L) and right (R) speakers 72 and 74 are
driven by the audio signal and the microcomputer 71 outputs control
signals CNT1, CNT2 and CNT3 in accordance with the input of a key
input circuit or portion 72.
The video signal processor 30 includes first and second comb
filters 31 and 32 for separating first and second video signals
output from the first and second demodulators 23 and 24 into
luminance (Y) and the chrominance (C) signals, a signal separating
circuit or portion 34 for separating the luminance (Y) and
chrominance (C) signals output from the second comb filter 32 into
a right picture signal (d) and caption and teletext signals (e) in
accordance with the control signal CNT3 generated by the
microcomputer 71, a switch SW1 for selectively outputting the
luminance (Y) and the chrominance (C) signals output from the first
comb filter 31 and the caption and teletext signals (e) output from
the signal separating circuit 34 as a left picture signal according
to the control signal CNT2 of the microcomputer 71, a
double-picture processing circuit 33 for processing the left and
right picture signals respectively output from the switch SW1 and
the signal separating circuit 34 into a double-picture. A matrix
circuit 40 converts the luminance (Y) and chrominance (C) signals
output from the double-picture processing portion 33 into RGB
signals, and the CRT driver 50 drives the CRT.
FIG. 2 is a flowchart illustrating a method of displaying caption
broadcast and teletext on a screen of a double-wide television
according to the present invention.
As shown in FIG. 2, the method of displaying a caption broadcast
and teletext includes the steps of inputting a caption broadcast
signal and displaying a picture corresponding to the broadcast
signal on a wide screen of a double-wide television (step 80), and
selecting a caption key (first caption key selecting step 81).
The method also includes the steps of segmenting a wide-screen into
at least two separate portions capable of displaying at least two
distinct pictures so that a caption display mode is initiated (step
82), displaying a televised signal and a caption signal in right
and left screens (step 83), respectively, selecting the caption key
again (second caption key selecting step 84), and converting the
caption display mode into the teletext display mode so that a
picture corresponding to the teletext signal is displayed on
another one of the at least two distinct portions of the
wide-screen (step 85). The method also includes the step of
selecting the caption key for returning the double-picture mode to
the initial wide-picture mode (third caption key selecting step
86).
Hereinafter, a preferred embodiment of the present invention will
be described with reference to FIGS. 1 and 2.
A double-wide television is provided according to a preferred
embodiment of the present invention for displaying a video signal
on a wide-screen (16:9 aspect ratio) and for simultaneously
displaying two image signals introduced from each different signal
source on left and right portions of the screens which are formed
by dividing the wide-screen.
As shown in FIG. 1, in the television signal receiver 20, the first
and second tuners 21 and 22 generate intermediate-frequency signals
from a carrier wave introduced via the antenna 10, and the first
and second demodulators 23 and 24 receives the
intermediate-frequency signals generated from the first and second
tuners 21 and 22 to generate first and second video signals and the
audio signals for the left and right channels. The audio signals of
the left and right channels output from the first and second
demodulators 23 and 24 are reproduced as an audio signal having
various modes by the audio signal processor 70. Subsequently, the
audio signals are output as sound waves via the left (L) and right
(R) speakers 72 and 74.
The first and second video signals respectively output from the
first and second demodulators 23 and 24 are input to the video
signal processor 30 in which the first and second video signals are
processed so as to be displayed as two corresponding pictures in
separate portions of the wide-screen. Here, the first and second
video signals include the caption and teletext signals.
In the video signal processor 30, in order to simultaneously
display pictures corresponding to two video signals on left and
right portions of the wide-screen in a double-picture mode, the
horizontal and vertical scanning periods of each video signal
before being coupled to each other and the horizontal and the
vertical scanning periods of the coupled video signal should be
matched. Here, it is assumed that the horizontal and vertical
scanning periods of the two video signals being coupled to each
other are the same.
The video signals output from the first and second demodulators 23
and 24 are input to the first and second comb filters 31 and 32 in
order to be output as left and right picture signals which each are
separated into luminance (Y) and the chrominance (C) signals.
Also, the audio signals output from the first and second
demodulators 23 and 24 are processed by the audio signal processor
70 and then output to the left and right channel speakers. Then,
the audio signals are output as sound waves via the left (L) and
right (R) speakers 72 and 74.
On the other hand, a first video signal (f) having the luminance
(Y) and the chrominance (C) components output from the first comb
filter 31 is output as the left picture signal via contact points a
and c of the switch SW1.
A second video signal output from the second comb filter 32 is
input to the signal separating circuit 34 and then output as the
right picture signal. Here, when a caption key is selected in a key
input device or panel 72, the microcomputer 71 outputs the control
signal CNT3 to the signal separating portion 34. Thus, the second
video signal output from the second demodulator 24 is separated
into a video signal (d) and the caption and teletext signals (e) by
the signal separating circuit 34.
The video signal (d) separated by the signal separating circuit 34
is output as a right picture signal, and the caption and teletext
signals (e) are output to the contact point b of the switch SW1.
Also, in the switch SW1, the contact point b is connected to the
contact point c by the control signal (CNT2) of the microcomputer
71 to output the caption and teletext signals (e) output from the
signal separating circuit 34 as a left picture signal.
The left and right picture signals output from the switch SW1 and
the signal separating portion 34 are processed by the
double-picture processing circuit 33 according to the control
signal CNT1 of the microcomputer 71, and then the double-picture
processing circuit 33 outputs the double-picture signal having the
luminance (Y) and chrominance (C) signals.
Subsequently, matrix-processing is performed with respect to the
luminance (Y) and the chrominance (C) signals output from the
double-picture processing circuit 33 in the matrix circuit 40 which
outputs RGB signals. The CRT driver 50 receives the RGB signals and
drives a CRT 60 to display an image including the two separate
pictures on right and left portions of the wide screen.
Next, the method for display a caption broadcast and teletext on
separate portions of the wide screen of a double-wide television
will be described with reference to FIG. 2.
As shown in FIG. 2, a video signal of a broadcast channel,
including a caption signal, is input to the double-wide television
to be displayed on a wide-screen (step 80). Subsequently, the
microcomputer 71 determines whether a caption key of the key input
device or panel 72 is selected by scanning the output of the key
input device or panel 72 which reflects different key strokes input
by a user (step 81).
If the caption key is selected, the microcomputer 71 outputs the
control signal CNT1 to the double-picture processing circuit 33 to
convert a single wide screen of the double-wide television into two
distinct portions so that two pictures may be displayed without any
overlap (step 82).
After the single screen is converted into two distinct portions the
switch SW1 is switched to the contact point b by a control signal
CNT2 generated by the microcomputer 71 and the signal (f) output
from the first comb filter 31 is blocked. Also, the caption signal
(e) output from the signal separating circuit 34 is output as the
left picture signal and the video signal (d) from which the caption
signal is eliminated is output as the right picture signal. As a
result, the video signal (d) is displayed on the right portion of
the wide screen and the caption information signal is displayed in
the left portion of the wide-screen (step 83).
However, one of ordinary skill in the art will appreciate that the
video signal (d) may be displayed on the right portion of the wide
screen and the caption information signal displayed on the left
portion thereof. Subsequently, the microcomputer 71 scans the keys
to determine whether the caption key has been selected a second
time (step 84). The caption key is selected a second time if the
image signal includes a teletext signal. As a result, the caption
display mode is converted into the teletext display mode in the
signal separating circuit 34 so that a picture corresponding to the
teletext signal can be displayed in the left portion of the
wide-screen.
Next, the microcomputer 71 determines whether the caption key has
been selected a third time by scanning the output of the key input
device 72 (step 86). If the caption key is selected, the
microcomputer 7 removes the caption or teletext picture displayed
in the left portion of the wide-screen and restores the original
wide screen by generating the control signal CNT2 again. Thus, a
picture corresponding to a video signal of a broadcast channel
including a caption signal may be displayed, as per step 80
described above.
By employing the apparatus and method of displaying a caption
broadcast and teletext of the present invention, the televised
picture and the caption broadcast or teletext picture can be
displayed in two separate portions of the wide-screen of a
double-wide television so that the pictures do not overlap each
other.
* * * * *