U.S. patent number RE42,297 [Application Number 11/058,630] was granted by the patent office on 2011-04-19 for apparatus and method for processing audio signals recorded on a medium.
This patent grant is currently assigned to LG Electronics Inc.. Invention is credited to Han Jung, Ki Won Kim.
United States Patent |
RE42,297 |
Jung , et al. |
April 19, 2011 |
**Please see images for:
( Certificate of Correction ) ** |
Apparatus and method for processing audio signals recorded on a
medium
Abstract
.[.This invention relates to a karaoke CD format and a device
for controlling audio signals utilizing the karaoke CD format which
provides a user with selective reproduction of the voice of a
player. The karaoke CD format includes a CD format divided into
video sectors and audio sectors. The audio sectors are further
divided into a part for recording accompaniment sound and playing
sound at the same time and a part for recording accompaniment sound
only. There is provided record coding information for
distinguishing the parts..]. .Iadd.A device, method and recording
medium for reproducing digital data, are discussed. According to an
embodiment, the recording medium includes digital audio data
recorded thereon, the digital audio data comprising data units
corresponding to at least one of: a first type of digital audio
data, and a second type of digital audio data which includes at
least one content different from the first type of digital audio
data. Each data unit includes supplementary information, which has:
a) coding information indicating a coding mode of the digital audio
data, b) identification information, different than the coding
information, identifying the data unit as one of the first type of
digital audio data or the second type of digital audio, and c) time
information controlling a presentation timing of data units of the
first or second type..Iaddend.
Inventors: |
Jung; Han (Seoul,
KR), Kim; Ki Won (Kyungki-do, KR) |
Assignee: |
LG Electronics Inc. (Seoul,
KR)
|
Family
ID: |
19363845 |
Appl.
No.: |
11/058,630 |
Filed: |
February 16, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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10848616 |
May 19, 2004 |
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08735572 |
Oct 23, 1996 |
6535467 |
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08307288 |
Sep 16, 1994 |
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Reissue of: |
09209280 |
Dec 11, 1998 |
06721249 |
Apr 13, 2004 |
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Foreign Application Priority Data
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Sep 17, 1993 [KR] |
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93-18841 |
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Current U.S.
Class: |
369/47.16;
369/53.37; 386/240; 369/47.23; 386/338; 369/47.2 |
Current CPC
Class: |
G11B
20/1251 (20130101); G11B 27/329 (20130101); G10H
1/363 (20130101); G11B 27/105 (20130101); G11B
27/10 (20130101); G11B 2220/255 (20130101); G10H
2240/066 (20130101); G11B 2220/2545 (20130101) |
Current International
Class: |
G11B
7/005 (20060101) |
Field of
Search: |
;369/47.16,47.2,47.23,53.37,124.01,124.15 ;386/240,338 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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0 710 491 |
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May 1996 |
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EP |
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01-232573 |
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Sep 1989 |
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JP |
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2-235260 |
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Sep 1990 |
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JP |
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2-296413 |
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Dec 1990 |
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JP |
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3-128586 |
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May 1991 |
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JP |
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4-265569 |
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Sep 1992 |
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JP |
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5-12831 |
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Jan 1993 |
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JP |
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05-236009 |
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Sep 1993 |
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JP |
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7-152391 |
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Jun 1995 |
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JP |
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WO-93/13626 |
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Jul 1993 |
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WO |
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WO-01/39836 |
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Jun 2001 |
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WO |
|
Other References
Sugahara et al., MPEG1 CD, "An application of MPEG1 coding
technology for Karaoke-CD moving picture," ITEJ Technical Report,
The Institute of Television Engineers of Japan, vol. 17, No. 20,
Mar. 1993, pp. 13-18. cited by other.
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Primary Examiner: Edun; Muhammad N.
Attorney, Agent or Firm: Birch, Stewart, Kolasch &
Birch, LLP
Parent Case Text
.Iadd.CROSS-REFERENCES TO RELATED APPLICATIONS.Iaddend.
.[.This is a division of application Ser. No. 08/735,572, filed
Oct. 23, 1996, now U.S. Pat. No. 6,535,467, which is a continuation
of 08/307,288, filed Sep. 16, 1994, now abandoned.--all of which
are incorporated herein by reference..].
.Iadd.This application is a continuation of U.S. Reissue
application Ser. No. 10/848,616 filed on May 19, 2004 (now
abandoned), which is a reissue of U.S. Pat. No. 6,721,249
(application Ser. No. 09/209,280 filed Dec. 11, 1998), which is a
divisional of U.S. application Ser. No. 08/735,572 filed Oct. 23,
1996 (U.S. Pat. No. 6,535,467), which is a continuation of U.S.
application Ser. No. 08/307,288 filed Sep. 16, 1994 (now
abandoned). The present application also claims foreign priority
benefits of Korean Patent Application No. 93-18841 filed Sep. 17,
1993 in The Republic of Korea. The entirety of each of the
above-identified documents is hereby incorporated by reference.
Note: More than one reissue application has been filed for the
reissue of U.S. Pat. No. 6,721,249. The reissue applications are
application Ser. No. 10/848,616 (parent of the present
application); Ser. No. 11/058,630 (the present application); Ser.
No. 10/848,617 (now abandoned); Ser. Nos. 11/905,506; 12/142,642;
12/142,658; 12/142,663; 12/142,674; 12/142,680; and 12/142,684
which are continuations of the present application..Iaddend.
Claims
What is claimed is:
1. A device for reproducing a digital .[.signal.]. .Iadd.data
.Iaddend.recorded on a medium, the digital .[.signal.]. .Iadd.data
.Iaddend.including a video .[.signal.]. .Iadd.data .Iaddend.and an
audio .[.signal.]. .Iadd.data.Iaddend., the audio .[.signal.].
.Iadd.data .Iaddend.being composed of data units, the data units
corresponding to at least one of: 1) a first type of digital audio
data, and 2) a second type of digital audio data which includes at
least one content different from the first type of digital audio
data; each data unit including attribute information, which has: a)
first information indicating a coding mode of the digital audio
data, and b) second information, different than said first
information, identifying the data unit as one of the first type of
digital audio data or the second type of digital audio data; the
data units of .Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data
.Iaddend.being interleaved between data units of .Iadd.digital
.Iaddend.video .[.signal.]. .Iadd.data.Iaddend., .Iadd.the device
.Iaddend.comprising: a demodulator .[.for demodulating.].
.Iadd.configured to demodulate .Iaddend.the digital .[.signal.].
.Iadd.audio data .Iaddend.to restore an original signal; a signal
processor .[.for receiving.]. .Iadd.configured to receive
.Iaddend.the .Iadd.digital .Iaddend.audio .[.signal.].
.Iadd.data.Iaddend., demodulated by the demodulator,
.[.extracting.]. .Iadd.extract .Iaddend.the second information,
.[.separating.]. .Iadd.and separate .Iaddend.the data units
corresponding to .[.a.]. .Iadd.the .Iaddend.first type of
.Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data .Iaddend.from
data units corresponding to .[.a.]. .Iadd.the .Iaddend.second type
of .Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data
.Iaddend.based on the extracted second information, said signal
processor including a system time clock, a memory .[.for storing.].
.Iadd.configured to store .Iaddend.the data units corresponding to
the first .[.type.]. and .[.the.]. second .[.type.]. .Iadd.types
.Iaddend.of .Iadd.digital .Iaddend.audio .[.signal.].
.Iadd.data.Iaddend., and .[.first or second.]. .Iadd.an
.Iaddend.audio presentation .[.parts receiving.]. .Iadd.part
configured to receive .Iaddend.the system time clock to control a
presentation timing of the first .[.type.]. or .[.the.]. second
.[.type.]. .Iadd.types .Iaddend.of .Iadd.digital .Iaddend.audio
.[.signal.]. .Iadd.data.Iaddend.; and a controller, coupled to the
signal processor, .[.controlling.]. .Iadd.configured to control
.Iaddend.the signal processor to output the data units
corresponding to the first .[.type.]. or .[.the.]. second
.[.type.]. .Iadd.types .Iaddend.of the .Iadd.digital .Iaddend.audio
.[.signal.]. .Iadd.data .Iaddend.designated by a user input,
wherein the first or second .[.type.]. .Iadd.types .Iaddend.of
.Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data.Iaddend.,
designated by the user input, is identified using the second
information.
2. A device as claimed in claim 1, wherein the first type of
.Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data
.Iaddend.corresponds to accompaniment sound.
3. A device as claimed in claim 1, wherein the audio signal is
encoded by an MPEG coding mode, wherein the signal processor
further comprises: an MPEG audio decoder .[.for decoding.].
.Iadd.configured to decode .Iaddend.the audio .[.signal.].
.Iadd.data.Iaddend..
4. A method for reproducing a digital .[.signal.]. .Iadd.data
.Iaddend.recorded on a medium, said digital .[.signal.]. .Iadd.data
.Iaddend.including a video .[.signal.]. .Iadd.data .Iaddend.and an
audio .[.signal.]. .Iadd.data.Iaddend., the audio .[.signal.].
.Iadd.data .Iaddend.being composed of data units, the data units
corresponding to at least one of: 1) a first type of digital audio
data, and 2) a second type of digital audio data which includes at
least one content different from the first type of digital audio
data; each data unit including attribute information, which has: a)
first information indicating a coding mode of the digital audio
data, and b) second information, different than said first
information, identifying the data unit as one of the first type of
digital audio data or the second type of digital audio data; the
data units of .Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data
.Iaddend.being interleaved between data units of .Iadd.digital
.Iaddend.video .[.signal.]. .Iadd.data.Iaddend., the method
comprising .[.the steps of.]. : demodulating the digital
.[.signal.]. .Iadd.audio data .Iaddend.to restore an original
signal; receiving the demodulated audio .[.signal.].
.Iadd.data.Iaddend.; extracting the second information; separating
the data units corresponding to .[.a.]. .Iadd.the .Iaddend.first
type of .Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data
.Iaddend.from .Iadd.the .Iaddend.data units corresponding to
.[.a.]. .Iadd.the .Iaddend.second type of .Iadd.digital
.Iaddend.audio .[.signal.]. based on the extracted second
information, by storing the first and second types of .Iadd.digital
.Iaddend.audio .[.signals.]. .Iadd.data .Iaddend.in a memory,
receiving the data units corresponding to the first .[.and.].
.Iadd.or .Iaddend.second types of .Iadd.digital .Iaddend.audio
.[.signals.]. .Iadd.data .Iaddend.in .[.first and second.].
.Iadd.an .Iaddend.audio presentation .[.parts.]. .Iadd.part
.Iaddend.along with a system time clock to control a presentation
timing of the first or second .[.type.]. .Iadd.types .Iaddend.of
.Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data.Iaddend.; and
outputting one of the first or second types of audio .[.signals.].
.Iadd.data .Iaddend.in response to a user input designating one of
the first or second types of audio .[.signals.].
.Iadd.data.Iaddend., wherein the first or second type of
.Iadd.digital .Iaddend.audio .[.signal.]. .Iadd.data.Iaddend.,
designated by the user input, is identified using the second
information.
5. The method of claim 4, wherein the step of separating includes
separating the first type of the .Iadd.digital .Iaddend.audio
.[.signal.]. .Iadd.data .Iaddend.representing accompaniment
sound.
6. A device for processing a digital .[.signal.].
.Iadd.data.Iaddend., comprising: an audio .[.signal.]. .Iadd.data
.Iaddend.processor .[.receiving.]. .Iadd.configured to receive
.Iaddend.data units of digital audio data, the data units
corresponding to at least one of: 1) a first type of digital audio
data, and 2) a second type of digital audio data which includes at
least one content different from the first type of digital audio
data; each data unit .[.including.]. .Iadd.being specified by
.Iaddend.attribute information, which has: a) coding information
indicating a coding mode of the digital audio data, and b)
identification information, different than said coding information,
identifying the data unit as one of the first type of digital audio
data or the second type of digital audio data; the audio
.[.signal.]. .Iadd.data .Iaddend.processor .[.extracting.].
.Iadd.configured to extract .Iaddend.the identification
information, and .[.separating.]. .Iadd.separate .Iaddend.the data
units of the first type from the data units of the second type
using the identification information, said .[.signal.]. .Iadd.audio
data .Iaddend.processor including a system time clock, a memory
.[.for storing.]. .Iadd.configured to store .Iaddend.the data units
of the first type and the second type, and .[.first and second.].
.Iadd.an .Iaddend.audio presentation .[.parts receiving.].
.Iadd.part configured to receive .Iaddend.the system time clock to
control a presentation timing of the data units of the first type
or the second type; and a control circuit .[.controlling.].
.Iadd.configured to control .Iaddend.the audio .[.signal.].
.Iadd.data .Iaddend.processor to output .[.an.]. audio .[.signal.].
.Iadd.data .Iaddend.corresponding to the data units of one of the
first or second types, based on the identification information.
7. The device of claim 6, wherein the audio data of the first type
includes accompaniment sound.
8. The device of claim 6, wherein the data units of digital audio
data are interleaved with digital video data, and wherein the audio
data of the first type includes accompaniment sound and vocals,
which are associated with the digital video data.
9. The device of claim 6, wherein the audio .[.signal.]. .Iadd.data
.Iaddend.processor .[.compares.]. .Iadd.is configured to compare
.Iaddend.the system time clock to timing information in the digital
audio data, and .[.outputs.]. .Iadd.output .Iaddend.audio data with
a timing based on the comparison.
10. The device of claim 6, wherein the audio .[.signal.].
.Iadd.data .Iaddend.processor .[.MPEG decodes.]. .Iadd.is
configured to decode .Iaddend.the audio data .Iadd.encoded in MPEG
format.Iaddend..
11. The device of claim 6, further comprising: a demodulator
.[.demodulating.]. .Iadd.configured to demodulate .Iaddend.the
digital audio data prior to receipt by the audio .[.signal.].
.Iadd.data .Iaddend.processor.
12. A method for processing a digital .[.signal.].
.Iadd.data.Iaddend., comprising: receiving data units of digital
audio data, the data units corresponding to at least one of: 1) a
first type of digital audio data, and 2) a second type of digital
audio data which includes at least one content different from the
first type of digital audio data; each data unit .[.including.].
.Iadd.being specified by .Iaddend.attribute information, which has:
a) coding information indicating a coding mode of the digital audio
data, and b) identification information, different than said coding
information, identifying the data unit as one of the first type of
digital audio data or the second type of digital audio data;
extracting the identification information; separating the data
units of the first type from the data units of the second type
using the identification information by storing the data units of
the first and second types in a memory, receiving the data units of
the first .[.and.]. .Iadd.or .Iaddend.second types in .[.first or
second.]. .Iadd.an .Iaddend.audio presentation .[.parts.].
.Iadd.part .Iaddend.along with a system time clock to control a
presentation timing of data units of the first or second type; and
outputting audio data corresponding to the data units of the first
or second type in response to the identification information.
13. The method of claim 12, wherein the audio data of the first
type includes accompaniment sound.
14. The method of claim 12, wherein the data units of digital audio
data are interleaved with digital video data, and wherein the audio
data of the first type includes accompaniment sound and vocals,
which are associated with the digital video data.
15. The method of claim 12, further comprising: comparing the
system time clock to timing information in the digital audio data;
and outputting the audio data with a timing based on the
comparison.
16. The .[.device.]. .Iadd.method .Iaddend.of claim 12, wherein the
separating step includes .[.MPEG decoding.]. .Iadd.decoding
.Iaddend.the audio data .Iadd.encoded in MPEG format.Iaddend..
17. The device of claim 1, wherein the .[.signal.]. .Iadd.audio
data .Iaddend.processor includes a switch .[.that.].
.Iadd.configured to .Iaddend.selectively .[.outputs.]. .Iadd.output
.Iaddend.the data units of the first type or the second type.
.Iadd.18. A recording medium on which digital audio data is
recorded, the digital audio data comprising of data units
corresponding to at least one of: 1) a first type of digital audio
data, and 2) a second type of digital audio data which includes at
least one content different from the first type of digital audio
data; each data unit including supplementary information, which
has: a) coding information indicating a coding mode of the digital
audio data, and b) identification information, different than said
coding information, identifying the data unit as one of the first
type of digital audio data or the second type of digital audio data
wherein the identification information being used for separating
the data units of the first type from the data units of the second
type stored in a memory and selectively outputting audio data
corresponding to the data units of the first or second type, and c)
time information controlling a presentation timing of data units of
the first or second type..Iaddend.
.Iadd.19. The recording medium of claim 18, wherein the data unit
corresponds to a sector..Iaddend.
.Iadd.20. The recording medium of claim 18, wherein the
supplementary information is included in a header of the data
unit..Iaddend.
.Iadd.21. The recording medium of claim 18, wherein the first or
the second type of audio data is interleaved with digital video
data..Iaddend.
.Iadd.22. The recording medium of claim 18, wherein the data units
correspond to packets that are multiplexed with each
other..Iaddend.
.Iadd.23. The recording medium of claim 18, wherein the coding mode
is a coding mode for indicating a MPEG format..Iaddend.
.Iadd.24. The recording medium of claim 18, wherein the time
information includes a PTS (Presentation Time Stamp)..Iaddend.
.Iadd.25. The recording medium of claim 18, wherein the digital
audio data of the first type includes accompaniment
sound..Iaddend.
.Iadd.26. The recording medium of claim 18, wherein the digital
audio data of the second type includes accompaniment sound and
vocal sound..Iaddend.
.Iadd.27. The recording medium of claim 18, wherein the first and
second types of digital audio data are decoded based on the coding
information..Iaddend.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a karaoke CD system, more particularly to
a karaoke CD format and a device for processing audio signals
utilizing the karaoke CD format which provides a user with
selective reproduction of the voice of a player.
2. Description of Related Art
As shown in FIG. 1, a general disc data layout of a karaoke CD
includes lead in/lead out areas 1 and 6 formed at the lead in and
lead out of the CD for encoding CD-ROMXA data containing empty
sectors of mode 2/form 2 therein, and program areas 2, 3, 4, and
5.
The program areas include a volume descriptor area 2 formed next to
the lead in area 1 containing the path name of a CDI application
program described in compact disc bridge system description. The
basic data area 3 is for recording the title of a song, the name of
the singer, the composer of the song, and the songwriter. The CDI
application program area 4 is for recording an application program
required for converting into compact disc bridge system description
which will facilitate the operation of a disc in CD-RTOS (Real Time
Operating System) in a CD-I/FMV player. The MPEG data area 5 is for
recording MPEG (Moving Picture Experts Group) video and audio
data.
The lead in area 1 has records of the number of songs, the period
of time of each song and total period of time, and the lead in part
and index part of each song. The lead out area 6 has record of the
end of the program.
As shown in FIG. 2, a conventional karaoke CD system includes a
first demodulation part 11 for demodulating EFM (Eight to Fourteen
Modulation) signals. A second modulation part 12 for demodulating
signals recorded in interleaved sectors for a CD-ROM upon receiving
signals from the first demodulation part 11. A CPU 16 for
demultiplexing system flow on receiving signals from the second
demodulation part 12. A first, and a second memory 17 and 18 for
storing video and audio data received from the CPU 16 respectively.
A MPEG video decoder 19 and a MPEG audio decoder 20 for decoding
MPEG video signals and MPEG audio signals of the video and audio
data stored in the first and the second memories 17 and 18
respectively. A STC (System Time Clock) 23 for clocking the system
time under the control of the CPU 16. A video and audio signal
processing part 13 having a video presentation part 21 for
comparing the STC of the STC part 23 to PTS (Presentation Time
Stamps) in the bit stream received from the MPEG video decoder 19.
An audio presentation part 22 for comparing the STC of the STC part
23 to PTS (Presentation Tune Stamps) in the bit stream received
from the MPEG audio decoder 20. A control part 10 for controlling
both the first and the second demodulation parts 11 and 12 and for
controlling the video and audio signal processing part 13 according
to a key signal applied thereto. A Digital-to-Analog (D/A)
converter 14 for converting the video signal received from the
video presentation part 21 and outputting the converted signal to a
monitor under the control of the control part 10, and a D/A
converter 15 for converting the audio signal received from the
audio presentation part 22 and applying the converted signal to a
speaker under the control of the control part 10.
The interleaving of a conventional MPEG video and MPEG audio
sectors is as shown in FIG. 3.
Since the quantity of MPEG video data is much greater than the
quantity of MPEG audio data, an MPEG audio sector A is periodically
positioned in between MPEG video sectors V. For example, one MPEG
audio sector A may be present in every four MPEG video sectors
V.
Shown in Table 1 is the audio channel encoding, which is to be
explained in detail hereinafter.
TABLE-US-00001 TABLE 1 Stereo Music Program Special Music Program
CH 0 Left mono without vocal CH 1 Right mono with vocal
The karaoke CD format includes a stereo music program having a left
audio channel for encoding on MPEG audio channel 0 and a right
audio channel for encoding on MPEG audio channel 1, and a special
music program having one channel for encoding music accompaniment
sound without vocal and the other channel for encoding music
accompaniment sound with vocal.
Operation of the conventional karaoke CD system is to be explained
hereinafter.
The karaoke data is read in through a pick-up, having EFM
demodulated and CD errors corrected through the first demodulation
part 11 which is an EFM/CIRC (Cross Interleave Read Solomon Code)
decoder. The data interleaved at encoding is demodulated through
the second demodulation part 12 which is a CD-ROM decoder. The data
is divided into audio data and video data through the video and
audio signal processing part 13 under the demultiplexing operation
of the CPU 16 and applied to the MPEG video decoder 19 and MPEG
audio decoder 20 through the first and the second memories 17 and
18 respectively.
The MPEG video decoder 19 and the MPEG audio decoder 20, restore
the compressed data, and compare the STC from the STC part 23 to
the PTS in the restored data to control the presentation time of
the data.
However, such a conventional karaoke-CD system has the disadvantage
of being unable to obtain stereophony sound in the case where music
without vocal and music with vocal of a specific music program is
carried on the first channel (Left) and the second channel
(Right).
SUMMARY OF THE INVENTION
The object of this invention is to provide a user with selective
reproduction of playing sound, i.e., voice (song of a singer) and
accompaniment sound.
These and other objects and features of this invention can be
achieved by providing a karaoke CD format which is divided into
video sectors and audio sectors, and the audio sectors are further
divided into a part for recording accompaniment sound and vocal
sound at the same time and another part for recording accompaniment
sound only. The audio sectors are further provided to record coding
information for distinguishing between the audio data stored in the
two parts. There is provided a device for controlling audio signals
using a karaoke CD format including a control means for controlling
the entire system according to signals applied from outside the
system. There is provided a demodulation means for demodulating a
signal read in from a CO which distinguishes between a part
containing recorded accompaniment sound and vocal sound at the same
time, and another part containing recorded accompaniment sound only
under the control of the control means. There is provided an audio
signal processing means for processing audio signals using signals
received from the demodulation means and transmitting data
corresponding to a first data signal corresponding to the
accompaniment sound and playing sound and a second data signal
corresponding to the playing sound only, a switching means for
selecting one of the first or second data signals and outputting
the selected data under the control of the control means, and a D/A
converting means for converting the data received from the
switching means and applying the converted data to a speaker under
the control of the control means.
.Iadd.According to one embodiment, the present invention is
directed to a device for reproducing a digital data recorded on a
medium, the digital data including a video data and an audio data,
the audio data being composed of data units, the data units
corresponding to at least one of: 1) a first type of digital audio
data, and 2) a second type of digital audio data which includes at
least one content different from the first type of digital audio
data; each data unit including attribute information, which has: a)
first information indicating a coding mode of the digital audio
data, and b) second information, different than the first
information, identifying the data unit as one of the first type of
digital audio data or the second type of digital audio data; the
data units of digital audio data being interleaved between data
units of digital video data, the device comprising: a demodulator
configured to demodulate the digital audio data to restore an
original signal; a signal processor configured to receive the
digital audio data, demodulated by the demodulator, extract the
second information, and separate the data units corresponding to
the first type of digital audio data from data units corresponding
to the second type of digital audio data based on the extracted
second information, the signal processor including a system time
clock, a memory configured to store the data units corresponding to
the first and second types of digital audio data, and an audio
presentation part configured to receive the system time clock to
control a presentation timing of the first or second types of
digital audio data; and a controller, coupled to the signal
processor, configured to control the signal processor to output the
data units corresponding to the first or second types of the
digital audio data designated by a user input, wherein the first or
second types of digital audio data, designated by the user input,
is identified using the second information.
According to one embodiment, the present invention is directed to a
method for reproducing a digital data recorded on a medium, the
digital data including a video data and an audio data, the audio
data being composed of data units, the data units corresponding to
at least one of: 1) a first type of digital audio data, and 2) a
second type of digital audio data which includes at least one
content different from the first type of digital audio data; each
data unit including attribute information, which has: a) first
information indicating a coding mode of the digital audio data, and
b) second information, different than the first information,
identifying the data unit as one of the first type of digital audio
data or the second type of digital audio data; the data units of
digital audio data being interleaved between data units of digital
video data, the method comprising: demodulating the digital audio
data to restore an original signal; receiving the demodulated audio
data; extracting the second information; separating the data units
corresponding to the first type of digital audio data from the data
units corresponding to the second type of digital audio based on
the extracted second information, by storing the first and second
types of digital audio data in a memory, receiving the data units
corresponding to the separated first or second types of digital
audio data in an audio presentation part along with a system time
clock to control a presentation timing of the first or second types
of digital audio data; and outputting one of the first or second
types of audio data in response to a user input designating one of
the first or second types of audio data, wherein the first or
second type of digital audio data, designated by the user input, is
identified using the second information.
According to one embodiment, the present invention is directed to a
device for processing a digital data, comprising: an audio data
processor configured to receive data units of digital audio data,
the data units corresponding to at least one of: 1) a first type of
digital audio data, and 2) a second type of digital audio data
which includes at least one content different from the first type
of digital audio data: each data unit.Iaddend..[.including.].
.Iadd.being specified by attribute information, which has: a)
coding information indicating a coding mode of the digital audio
data, and b) identification information, different than the coding
information, identifying the data unit as one of the first type of
digital audio data or the second type of digital audio data; the
audio data processor configured to extract the identification
information, and separate the data units of the first type from the
data units of the second type using the identification information,
the audio data processor including a system time clock, a memory
configured to store the data units of the first type and the second
type, and an audio presentation part configured to receive the
system time clock to control a presentation timing of the data
units of the first type or the second type; and a control circuit
configured to control the audio data processor to output audio data
corresponding to the data units of one of the first or second
types, based on the identification information.
According to one embodiment, the present invention is directed to a
method for processing a digital data, comprising: receiving data
units of digital audio data, the data units corresponding to at
least one of: 1) a first type of digital audio data, and 2) a
second type of digital audio data which includes at least one
content different from the first type of digital audio data; each
data unit.Iaddend..[.including.]. .Iadd.being specified by
attribute information, which has: a) coding information indicating
a coding mode of the digital audio data, and b) identification
information, different than the coding information, identifying the
data unit as one of the first type of digital audio data or the
second type of digital audio data; extracting the identification
information; separating the data units of the first type from the
data units of the second type using the identification information
by storing the data units of the first and second types in a
memory, receiving the data units of the first or second types in an
audio presentation part along with a system time clock to control a
presentation timing of data units of the first or second type; and
outputting audio data corresponding to the data units of the first
or second type in response to the identification information.
According to one embodiment, the present invention is directed to a
recording medium on which digital audio data is recorded, the
digital audio data comprising of data units corresponding to at
least one of: a first type of digital audio data, and a second type
of digital audio data which includes at least one content different
from the first type of digital audio data; each data unit including
supplementary information, which has: a) coding information
indicating a coding mode of the digital audio data, b)
identification information, different than the coding information,
identifying the data unit as one of the first type of digital audio
data or the second type of digital audio data wherein the
identification information being used for separating the data units
of the first type from the data units of the second type stored in
a memory and selectively outputting audio data corresponding to the
data units of the first or second type, and c) time information
controlling a presentation timing of data units of the first or
second type..Iaddend.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a layout of a karaoke CD data.
FIG. 2 is a block diagram of a conventional karaoke CD system.
FIG. 3 is a diagram showing a conventional interleaving of MPEG
audio/video sectors.
FIG. 4 is a diagram of a subheader in accordance with this
invention.
FIG. 5 is a diagram showing an interleaving of MPEG audio/video
sectors in accordance with this invention.
FIG. 6 is a schematic block diagram of a device for controlling
karaoke CD audio signal in accordance with this invention.
FIG. 7 is an operational flow diagram of a device for controlling
karaoke CD audio signals.
FIG. 8 is an MPEG audio format in accordance with this
invention.
DETAILED DESCRIPTION OF THE INVENTION
This invention is to be explained in detail hereinafter, referring
to the attached drawings.
A subheader in accordance with this invention is shown in FIG. 4.
To distinguish audio data Aa, containing both vocal sound and
accompaniment sound, and audio data Ab, containing only
accompaniment data, there is provided subheader information in an
audio packet, the subheader includes coding information encoded
therein with a distinguishing value applied thereto.
The coding information is, included into a subheader of each sector
at data encoding as a distinguishing value, standardized as $0 F in
case of MPEG video, and $7 F in case of MPEG audio, wherein new
coding information (for example 3F) is added to use for a
distinguishing signal for the audio data sector Aa, having both
vocal sound and accompaniment sound, and the audio data sector Ab
having only accompaniment sound.
Interleaving of MPEG video and MPEG audio sectors is as shown in
FIG. 5. The interleaving of video data and audio data sectors, in
general has 4 to 5 consecutive video sectors V with one audio
sector A added thereto, where coding information is used to
distinguish a sector containing the encoded Aa and Ab.
Since the increase of buffer size due to the newly added audio
sectors Aa and Ab is infinitesimal compared to the image data, it
can be ignored.
That is, the karaoke CD format in accordance with this invention
includes a CD format divided into video sectors and audio sectors,
and the audio sectors are further divided into a part Aa for
recording both accompaniment sound and vocal sound at the same time
and a part Ab for recording accompaniment sound only, and the audio
sectors are further provided to record coding information for
distinguishing between audio data stored in the two parts.
As shown in FIG. 6, a device for controlling a karaoke CD audio
signal in accordance with this invention in a state having the
audio data interleaved as explained above, includes a control part
30, a demodulation part 40, an audio signal processing part 70, a
switch 50, and a D/A converting part 60.
The control part 30 controls the entire system according to the
signal applied through a key matrix 80.
The demodulation part 40 includes a first demodulator 41 for
carrying out EFM demodulation from the CD format provided to
distinguish a part Aa for recording accompaniment sound and vocal
sound at the same time, and a part Ab for recording accompaniment
sound only, where the part is under the control of the control part
30, and a second demodulator 42 for demodulating signals recorded
in interleaved sectors for a CD-ROM from the signal received from
the first demodulator 41 and applying the second demodulated signal
to the audio processing part 70 under the control of the control
part 30, thereby demodulating the signal read in from the CD format
provided to distinguish a part Aa, for recording accompaniment
sound and vocal sound at the same time, and a part Ab, for
recording accompaniment sound only, under the control of the
control part 30.
The audio signal processing part 70 includes a CPU 71 for
separating audio data and time data from the signal received from
the second demodulator 42 under the control of the control part 30,
a STC (System Time Clock) part 77 for generating a synchronizing
signal using time information received from the CPU 71, a memory 72
for storing the audio data received from the CPU 71, an MPEG audio
decoder 73 for decoding the MPEG audio data stored in the memory
72, a demultiplexer 74 for separating data received form the MPEG
audio decoder 73 into data corresponding to accompaniment sound and
vocal sound and data corresponding to accompaniment sound and
outputting the separated data under the control of the CPU 71, a
first audio presentation part 75 for comparing the PTS
(Presentation Time Stamp) in the data corresponding to the
accompaniment sound received from the demultiplexer 74 to the
signal received from the STC 77 to control presentation time of the
data, and a second audio presentation part 76 for comparing the PTS
(Presentation Time Stamp) in the data corresponding to
accompaniment sound and vocal sound received from the demultiplexer
74 to the signal received from the STC 77 to control presentation
time of the data, thereby processing the audio signal using signals
received from the demodulation part 40 to separate the data into
data corresponding to a first data containing accompaniment sound
only, and outputting the separate data.
The switch 50 selects one of the data corresponding to the
accompaniment sound and vocal sound, or to only the accompaniment
sound received from the first and the second audio presentation
parts 75 and 76 of the audio signal processing part 70 and
transmits the selected data under the control of the control part
30.
The D/A converter 60 converts the data received from the switch 50
under the control of the control part 30.
The system and operation for processing a video signal is the same
as for a conventional karaoke CD system.
Operation of the device for controlling a karaoke CD audio signal
in accordance with this invention as described above is to be
explained hereinafter.
The encoded karaoke-CD data having coding information applied
thereto is added with a distinguishing value and has EFM signals
demodulated through the first demodulation part 41 which is a
EFM/CIRC (Cross Interleave Read Solomon Code) and errors of the CD
are corrected. The interleaved data at encoding is demodulated
through the second demodulation part 42 which is a CD-ROM decoder,
and is separated into audio, video, and time data in the CPU
71.
In the instant, of audio data, the demultiplexing signal coming in
at the reading in of the coding information is applied to the
demultiplexer 74 for operation of the demultiplexer 74.
Of the data demultiplexed in the CPU 71, the MPEG audio data is
stored in the memory 72 temporarily, has the compression restored
through the MPEG audio decoder 73, and is transmitted. The
demodulated audio data received from the MPEG audio decoder 73 is
separated into audio data carrying accompaniment sound only and
audio data carrying accompaniment sound and vocal sound through the
demultiplexer 74, and applied to the first audio data presentation
part 75 and the second audio presentation part 76 respectively
under the control of the CPU 71.
The audio demultiplexing signal received from the CPU 71 controls
the first audio presentation part 75 to compare the received audio
data Ab, carrying accompaniment sound only out of the audio signal
applied thereto, to a PTS to control the presentation time and
controls the second audio presentation part 76 to compare the
received audio data Aa, carrying voice, i.e., vocal sound and
accompaniment sound out of the audio signal applied thereto to a
PTS to control the presentation time. The audio data received from
the first and the second audio presentation parts 75 and 76 is
applied to the D/A converter 60 through a switching operation of
the switch 50 under the control of the control part 30, where it is
converted in the D/A converter 60 and output to a speaker.
In this instant, the switch 50 is operated under the control of the
control part 30 which is operated according to the key signal
applied through the key matrix 80.
Operation of a karaoke CD audio system is to be explained
hereinafter, referring to FIG. 7.
First, a subheader and packet header are read 100, and
demultiplexing is carried out to separate into an audio
demultiplexing signal and a MPEG audio signal 101. The separated
MPEG audio signal is decoded to separate into audio signals
containing accompaniment sound only, and audio signals containing
both vocal sound and accompaniment sound using the audio
demultiplexing signal 102, and the PTS of each packet is read to
synchronize and transmit signals 103.
The MPEG audio format, as shown in FIG. 8, generates separated MPEG
audio signals Aa and Ab, and audio demultiplexing signals by
extracting coding information from the subheaders of each sector,
and by reading the packet header and comparing it to the STC,
thereby the presentation time of the data can be controlled.
As has been explained, this invention for a karaoke CD system
increases the enjoyment of karaoke by reproducing audio data
containing a player's voice, i.e., vocal sound and accompaniment
sound, and audio data containing accompaniment sound selectively,
which permits stereophony sound corresponding to the CD sound.
Although the invention has been described in conjunction with
specific embodiments, it is evident that many alternatives and
variations will be apparent to those skilled in the art in light of
the foregoing description. Accordingly, the invention is intended
to embrace all of the alternatives and variations that fall within
the spirit and scope of the appended claims.
* * * * *