Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
1998-12-11
2004-04-13
Young, W. R. (Department: 2652)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S047200, C369S047230, C369S053370, C386S349000, C386S349000
Reexamination Certificate
active
06721249
ABSTRACT:
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 Time 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 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 CD 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.
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Jung Han
Kim Ki Won
LG Electronics Inc.
Young W. R.
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