JPH0462151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is capable of playing back both a disk on which digital audio data is recorded and a disk on which both digital audio data and still image data are recorded. This invention relates to a disc playback device.

"Background technology and its problems" A system using an optical digital audio disk (referred to as a compact disk) uses an error correction code with high correction ability, and is a disk system that can reproduce high-quality stereo music. It is. By using the same error correction code and the same signal format as this compact disc, if you record data representing characters, still image data, and game programs along with stereo music data, you can enjoy stereo music playback. It is now possible to play still images such as paintings that match the music, display the composer, song title, etc., and play music that matches the game.
The range of applications of the compact disk system can be expanded. The data storage capacity of current compact discs is approximately 500 Mbytes per disc, making it possible to record both stereo music data and digital data on a single disc.

However, many types of current discs that only record stereo music data are already on the market, and as a disc playback device, it is possible to use both current discs and discs that record two types of data as described above. Furthermore, it is preferable that discs on which only digital data is recorded can also be played back. This allows the user to play a disc according to the purpose using a single disc playback device.

``Object of the Invention'' Therefore, the object of the present invention is to reproduce both the current compact disk on which only stereo music data is recorded and the disk on which two types of data, such as stereo music data and still image data, are recorded. The object of the present invention is to provide a disc playback device that can prevent noise from occurring even when playing back digital data other than audio data.

"Summary of the Invention" The present invention is capable of reproducing both a first disk on which first digital data is recorded and a second disk on which both first digital data and second digital data are recorded. In the disc playback device, a first playback processing circuit for the first digital data, a second playback processing circuit for the second digital data, and a playback process for identifying the first disk and the second disk are provided. and a control circuit to which control data is supplied, and the output of the control circuit switches the control of the playback operation of the pickup and also switches between the first playback processing circuit and the second playback processing circuit. This is a disc playback device.

"Embodiment" An embodiment of the present invention is an application of the present invention to a compact disk.

The data structure when the signal recorded on a compact disc is audio data will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows a data stream recorded on a compact disc. One frame consists of 588 bits of recorded data, and a frame synchronization pulse FS of a specific bit pattern is inserted into each frame. After the frame synchronization pulse FS, a 3-bit DC component suppression bit RB is provided, and further, After that, 14-bit data bits DB numbered 0 to 32 and 3-bit DC component suppression bits RB are alternately provided. The 0th bit in the data bit DB is called a sub-coating signal or user's bit, and is used for disc playback control, display of related information, etc. The 1st to 12th and 17th to 28th data bit DBs are allocated to the main channel audio data, and the remaining 13th to 16th and 29th to 32nd data bit DBs are allocated to the parity data of the main channel error correction code. It will be done. Each data bit DB is obtained by converting 8-bit data into 14-bit data by 8-14 conversion during recording.

FIG. 2 shows a state in which 98 frames are sequentially arranged in parallel, with each data bit DB being 8 bits, excluding the DC component suppression bit. The sub-coating signals P to W of frames 0 and 1 form a sync pattern which is a predetermined bit pattern. Regarding the Q channel, a CRC code for error detection is inserted into 16 frames on the terminal side out of 98 frames.

The P channel is a flag indicating pause and music, and has a low level for music, a high level for pause, and a pulse with a 2 Hz cycle in the readout section. Therefore, by detecting and counting the P channels, it becomes possible to select and reproduce designated music. The Q channel can perform the same type of control in a more complex manner, for example, by importing Q channel information into a microcomputer installed in the disk playback device, and immediately switching to playing other music even in the middle of playing music. Random selection of songs can be performed. Other R channels to W channels are:
Lyricists and composers of the songs recorded on the disc,
It is used to display explanations, poems, etc., and to provide audio explanations.

Of the 98 bits of the Q channel, the first 2 bits are used as a sync pattern, the next 4 bits are used as control bits, the next 4 bits are used as address bits, and the next 72 bits are used as data bits. and finally a CRC for error detection
A code is added. The 96 bits of the Q channel are the lead intratrack and have a data structure as shown in FIG. 3A. 72 data bits are inserted after the first to fourth control bits and the fifth to eighth address bits. The first 8 bits of the data bits are the track number TNR, and each 4 bits of the data bits change from 0 to 9 in decimal notation, and the track number TNR changes from (00) to (99). In the lead intratrack (TNR=00)
It is said that 8 after this track number TNR
A bit is considered a point, the next 4 bits are minutes, the next 4 bits are seconds, and the next 4 bits are frame data (75 frames = 1 second).
All 8 bits from the 49th bit are set to 0,
Each of the subsequent 4 bits is used as minute, second, and frame data for the point.

In the lead intratrack and music program,
Minute, second, and frame data that changes with the passage of time from 0 minutes, 0 seconds, and 0 frames to the end of the lead intratrack or music program is inserted.
In addition, TOC (Table of contents) data indicating the recorded contents of the disc is recorded in the lead intratrack.
Second and frame data is TOC data. In other words, the minutes, seconds, and minutes of the start position of each music program with the track number inserted as a point.
The frame value is inserted as Q channel data of the lead intratrack.

Furthermore, if the point data is A0 (hexadecimal notation), the data indicated by PMIN indicates the track number of the first music program on the disk, and the second and frame data at that time are set to zero. If the point data is A1, the minute data indicates the track number of the last music program on the disc, and the second and frame data at that time are set to zero. Furthermore, if the point data is A2, minutes,
It is assumed that the data in seconds and frames indicates the start position of the lead-out track.

As mentioned above, the lead intratrack has Q channel data recorded therein, but no main channel, ie, stereo music data. Similarly, the current compact disc standard, in which stereo music data is not recorded in the lead-out area, allows the presence of up to 4 bits of data, including the least significant bit of 16-bit data.

Further, the bit arrangement of Q channel data in the program area is shown in FIG. 3B. first 4
One bit is used as a control bit, the next four bits are used as an address bit, and the next eight bits are used as a track number TNR. As mentioned above, in the lead intra track, (TNR=00), in the program area, (TNR=01~99), and in the lead out track, (TNR=
AA). The lead-out track begins at the end of the last music program recorded on the disc.

The next 8 bits of the track number TNR are index X. The index further divides each music program, starting from 01 and increasing in increments of 1 up to 99. During the pause period, it is always (X=00). The minute, second, and frame data after index X indicates the elapsed time from the beginning to the end of each music program or pause. Furthermore, the minutes (A MIN.), seconds (A SEC.), and frame (A FRAME) data that follow the 8-bit all-0 data start from the beginning of the program area and end at the end of the lead-out track. This is absolute time data representing the elapsed time to end. Data recorded on a compact disc can be accessed using this absolute time code.

The control bits inserted into the Q channel mentioned above are determined as shown in FIG. 3C. In FIG. 3C, x means an undefined bit which may be either 0 or 1. The control bit (00x0) means 2-channel audio data that is not pre-emphasized, and (00x1) means 2-channel audio data that is pre-emphasized. Control bits (10××) (01×1) are not yet defined. (01×0) means that digital data such as still image data is recorded. (XX0×) means that copying the digital data as is is prohibited,
(XX1×) means that digital copying is allowed. In one embodiment of the present invention, the control bit is set to (01x1) in the case of a disc on which both stereo music data and digital data are recorded.

A current compact disc on which stereo music data and sub-coding signals as described above are recorded will be explained with reference to FIG. 4.

In FIG. 4, 1 indicates the current compact disc, and 2 indicates the center hole. The compact disc 1 is irradiated with a laser beam for reproduction from the lower surface thereof, and a reproduction operation is performed from the inner circumferential side to the outer circumferential side. The center hole 2 has a diameter of 15 mm. 3
indicates the clamping area where the compact disk 1 is supported when the compact disk 1 is attached or detached (range from a position with a diameter of 26 mm to this range of 33 mm), and 4 indicates the program area (with a diameter of 50 mm to 116 mm).
5 indicates the information area (with a diameter of 45 mm).
to 118mm). A lead-in track start position 6 (a position with a maximum diameter of 46 mm) is defined on the inner circumference side of the program area 4 within the information area 5, and a maximum lead-out position 7 is defined on the outer circumference side of the program area 4 within the information area 5. stipulated.

On a disk having the same thickness and diameter as the current compact disk 1, digital data is recorded together with stereo music as main channel data. The P channel and Q channel of the sub-coding signal and the data structure are the same as those of the compact disc.

FIG. 5 shows the recording format of digital data. The unit of digital data is (588 x 4 bytes = 2352 bytes), and this unit is defined as one block. In FIG. 5, the left channel and right channel indicate the correspondence with sample data of the left and right channels of stereo music data. As mentioned above, in the case of stereo music data, (6 x 2 x 2 = 24 bytes) of data is recorded within the interval specified by the frame synchronization signal, so the signal format is the same as the stereo music data. When digital data is recorded according to the method shown in FIG. 1, one block (2352 bytes) is recorded from the 0th frame to the 97th frame. Therefore, 98 of the period of change of the subcoating signal
Digital data can be recorded without breaking the frame.

The first byte of one block of digital data is all 0 bits, the next 10 bytes are all 1 bits, and the next 1 byte is all 0 bits. This 12-byte section is used as a header indicating the beginning of one block of digital data. After the header, 1 byte each,
Seconds, sectors, and mode data are added.
Minutes, seconds, and sectors are the addresses of one block, and like a frame, a sector is made up of 75 sectors and one second. The mode data indicates the type of digital data of the block. Digital data such as still image data is inserted into the remaining 2340 bytes, excluding the header, address (minutes, seconds, sectors), and mode.

Several examples of discs on which the above-mentioned digital data is recorded together with stereo music data will be described with reference to FIGS. 6 to 9.

The disk 11 shown in FIG.
1, and an information area 5 is set from a position on the inner circumferential side of this comprehensive information area 21 to a predetermined position on the outer circumferential side. Stereo music data is recorded in the first program area 4 within this information area 5. A first lead intratrack starting from the start position 6 of the first lead intratrack is provided on the inner circumferential side of the first program area 4, and a first lead intratrack starting from the first lead intratrack start position 6 is provided on the outer circumferential side of the program area 4 up to the maximum lead out position 7. A lead-out track is provided. The sub-coding signals recorded on the first lead-in track, the first lead-out track, and the first program area 4 are similar to those on current compact discs. However, the control bit in the Q channel data recorded on the first lead intratrack (track number TNR = 00) is (01 x 1), and both stereo music data and digital data are recorded. It is shown that it is a disk.

As described later, when this control data is read by a disc playback device, the playback start position is jumped to the start position of the first leadout track, and the track number TNR ( =AA)
is ignored, and furthermore, the disk playback operation is controlled so that playback is performed to the outer circumference of the disk.

A second lead-in area 22 is provided on the outer circumferential side of the information area 5 in the general information area 21, and a second program area 23 is provided on the outer circumferential side of this second lead-in area 22. Second program area 2
A second lead-out track is provided at a further outer circumferential side of 3 to a second maximum lead-out position 24. In the second program area 23, digital data such as still image data having the data structure shown in FIG. 5 is recorded. A Q channel sub-coding signal as shown in FIG. 3B is recorded in the second lead-in area 22 and the second lead-out track. The track number TNR of the second lead-in area 22 is set to AD, and the track number TNR of the second lead-out track is set to AE.

In the second lead-in area 22, the disk 11
Control information necessary for reproducing is recorded, and the disc reproducing device reproduces the first program area 4 and the second program area 23 in accordance with this control information. and the track number of the second leadout track.
TNR is considered as AE, and playback operation ends when this is detected.

FIG. 7 shows another configuration of the disk 12. In this disc 12, within the general information area 21, the second program area 23 where digital data is recorded is made sufficiently wider than the first program area 4 where stereo music data is recorded, and digital data is mainly recorded. It is a disc that has been used. In the first program area 4, there is a voice saying "This disc is not a music disc and cannot be played." in Japanese, English, German, and English.
It is also recorded in various languages such as French. This is effective in preventing the risk of mistaking the fact that music is not being played back to be a malfunction when playing back a disc on which digital data has been recorded using a current compact disc playback device. Furthermore, the new disc playback device that can play back the digital data in the second program area 23 performs an operation that omits the playback of the audio data described above based on the control information recorded in the second lead-in area 22. It's okay to get old.

The disk 13 shown in FIG. 8 is mainly used for reproducing stereo music data, similar to the disk 11 shown in FIG. Further, a second lead-in track start position 25 is defined on the inner circumferential side of the first lead-in track start position 6, and a second lead-in area 22 is defined between the two.

In this second lead-in area 22, a control bit (01x1) indicating that both stereo music data and digital data are recorded on the disc is recorded as Q channel data. Further, in the second program area 23, control information indicating the method of reproducing the first program area 4 and the second program area 23 is recorded at a position on the inner circumferential side that is first reproduced.

The disk 14 shown in FIG. 9 is mainly used for reproducing digital data, similar to the disk 12 shown in FIG. 7. Therefore, in the first program area 4, audio is recorded in a plurality of languages indicating that the disc is a disc on which digital data has been recorded and is not intended for music reproduction. This first program area 4
A first lead-in area is provided from the start position 6 of the first lead-in track on the inner circumference side, and a start position of the second lead-in track is provided further inward from the first lead-in area. From position 25 a second lead-in area 22 is provided.

Disk 1 shown in FIGS. 6 to 9 above, respectively.
Nos. 1, 12, 13, and 14 are capable of reproducing both audio data and digital data by a disk reproducing device with a new configuration to which the present invention is applied, and the current disk reproducing device can reproduce audio data. It is reproducible.

An example of a disc playback device according to the present invention will be explained with reference to FIG. In FIG. 10, 31 indicates a disk player, and the stereo music signal reproduced by the disk player 31 is processed (14→8) by demodulation, error correction, interpolation, D/A conversion, etc., and output terminals 32L, It is taken out at 32R. At the output terminals 32L and 32R of the disc player 31, left channel and right channel signals of the reproduced stereo signal are obtained, respectively. The audio signals of these channels are sent to speakers 34L and 3 through amplifiers 33L and 33R, respectively.
4R, the user can play stereo music.

Further, when the disc played by the disc player 31 records digital data other than stereo music signals, the reproduced data of this disc is supplied to the serial/parallel conversion circuit 35. Frame pulses and bit clocks synchronized with reproduced data are supplied from the disk player 31 to the serial/parallel converter 35, and data parallelized for each symbol (8 bits) appears from the serial/parallel converter 35. This parallel data is passed through the input switch 36 to the buffer memory 37,
38 are written alternately. Further, a control data extraction circuit 40 is provided in association with the serial/parallel conversion circuit 35.

41 indicates a controller consisting of a microcomputer. This controller 41 is supplied with control data from the extraction circuit 40 and also with sub-coding signals from the disc player 31. An identification code (control bit) indicating that the signal recorded on the disc to be reproduced is both a stereo music signal and digital data is inserted into the Q channel of the sub-coding signal. Based on this identification code, the controller 41 generates a control signal for controlling switching of the reproduction output signal path of the disc player 31, and supplies this control signal to the disc player 31.

Further, the outputs of the buffer memories 37 and 38 are alternately read out by the output switch 39 and supplied to the DMA controller 42. buffer memory 3
7 and 38 are provided because the reproduction data of compact discs is high speed. DMA controller 42 is controlled by controller 41.

The output of the DMA controller 42 is supplied to a data selector 43. The data selector 43 is
It is controlled by a controller 41 and supplies the output data of the DMA controller 42 to different circuits depending on the still image mode and digital data (game program, etc.) mode. In the still image mode, color image data consisting of Y, U, and V components is sent to the frame memory 4 via the still image data decoder 44.
5 is written. The operations of the decoder 44 and frame memory 45 are performed by the controller 41. The still image data repeatedly read out one frame at a time from the frame memory 45 is
The signal is converted into an analog color video signal by a D/A converter 46 and supplied to a CRT display 47.

Further, if the digital data is a game program, it is supplied from the data selector 43 to the data conversion circuit 48, where it is converted into serial data in a predetermined format, and further transferred to the interface 4.
9 to the microcomputer system 50.

The operation when, for example, the disk 11 shown in FIG. 6 is played back by the above-mentioned disk playback device will be explained. As an example, as shown in FIG. 11A, in the first program area 4 of the compact disk 11, pause sections are sandwiched between each
Songs M ₁ , M ₂ , M ₃ , M ₄ are recorded, and one frame of still image data D ₁ , D ₂ , D ₃ , D ₄ corresponding to each song is recorded in the second program area 23. has been done.

When the disc player 31 reproduces the first lead intratrack from the start position 6, it reproduces the TOC data of the Q channel of the sub-coding signal recorded in the lead intratrack, and this TOC data is transmitted to the system controller of the disc player 31 and The signal is supplied to the controller 41. When the control bit of the Q channel is set to (01×1), the pickup of the disk player 31 is performed in the program area 4, as shown in FIG. 11B.
Jump this area without playing the first
The playback operation starts again from the star position of the lead-out track.

When the first lead-out track is played, the second lead-in area 22 is played, and this area 22
The control data DR reproduced from is supplied to the controller 41 via the serial/parallel conversion circuit 35 and the extraction circuit 40. Next, the first still image data _D1 is reproduced. This still image data
The address and mode data of D ₁ are supplied to the controller 41 via the extraction circuit 40, and the reproduced digital data is supplied to the decoder 44 by the data selector 43. Still image data D ₁ is buffer 37 or 3
8, DMA controller 42 and data selector 4
3 and is written into the frame memory 45 via the decoder 44. When the TOC data is reproduced from the first lead-in area, muting is applied so that no audio output is generated while the second lead-in area 22 and the second program area 23 are being reproduced.

As shown in FIG. 11B, still image data D ₁
When it finishes playing, the pick-up will display the first song.
Return to the start position of _M1 and start playing song _M1 . In this case, as shown in FIG. 12, the still image data _D1 is repeatedly read out from the frame memory 45, and the still image is reproduced on the CRT display 47. Therefore, the still image reproduced on the CRT display 47 can be viewed while listening to the song _M1 . When the reproduction of the song _M1 is finished, the pickup is fast-forwarded to the outer circumferential side, and reproduction of the still image data _D2 in the second program area 23 is started, as shown in FIG. 11B.
The position of the still image data D ₁ to D ₄ in the second program area 23 is determined by the TOC data recorded in the first lead-in area or the TOC data recorded in the second lead-in area 22. Indicated by control data.

The reproduced still image data _D2 is processed in _the same manner as the still image data _D1 , and as shown in FIG.
is played by. Thereafter, in the same way, still image data D ₃ , song M ₃ , still image data D ₄ , and song M ₄ are sequentially processed.
After the song _M4 is played back and the second lead-out area is played back, it is determined that all the playbacks have been completed, and the playback operation is ended.

The disc 11 can also be played back by a playback device that plays back a disc on which only stereo music is recorded. In other words, starting position 6 of disk 11
Playback of the first lead intratrack is started from then, and TOC data is played back. Even if the control bit of the Q channel in the first lead intra track is set to (01×1), conventional disc playback devices cannot decode this control bit and ignore its meaning. Therefore, as shown in FIG. 13, after the first lead intra track, if the songs M ₁ , M ₂ , M ₃ , and M ₄ are sequentially played and the first lead out track is played, the playback operation will be The playback operation ends with the completion of the playback operation.
Therefore, there is no need to reproduce the outer circumferential side of the first lead-out track, and it is possible to prevent abnormal noise from being generated by reproducing the control data DR and still image data _D1 to _D4 .

Note that the disks 12, 1 shown in FIGS. 7 to 9
Reproduction of numbers 3 and 14 is performed in the same manner as described above.
Furthermore, the disc playback device shown in FIG. 10 can also play back discs on which only stereo music is recorded or discs on which only digital data is recorded. In other words, the control bits in the Q channel reproduced from the first lead-in area switch the reproduction signal processing circuit and mute the audio data reproduction system.

"Application Example" The present invention can be applied not only to optical disks but also to magnetic disks and capacitance disks.

"Effects of the Invention" According to the present invention, it is possible to reproduce a disc on which both first digital data and second digital data are recorded, and at the time of reproduction, digital data other than audio data can be used. It is possible to prevent noise from occurring. Furthermore, the present invention uses identification data to determine whether the data recorded on the disk is both the first and second digital data or only the first digital data. For example, a current compact disc on which only the first digital data is recorded can be reproduced without any problem.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams used to explain the data recorded on the disk, and FIG. 3 is a schematic diagram used to explain the Q channel of the sub-coding signal.
Figure 4 is a sectional view used to explain the current compact disk, Figure 5 is a schematic diagram used to explain the data structure of digital data, Figures 6, 7, and 8.
and FIG. 9 are cross-sectional views showing some examples of disks that can be reproduced according to the present invention, respectively.
FIG. 10 is a block diagram of one embodiment of a disc reproducing apparatus according to the present invention, and FIGS. 11, 12, and 13 are schematic diagrams used to explain the reproducing operation of one embodiment of the present invention. 4...First program area, 6...First lead intratrack start position, 7, 24...Maximum lead-out position, 11, 12, 13, 14...Disk, 22...Second lead-in Area, 23...
...Second program area, 31...Disk player, 34L, 34R...Speaker, 41...Controller, 43...Data selector, 45...
Frame memory, 47...CRT display,
50...Microcomputer system.

Claims (1)

[Claims] 1. A first disk on which first digital data is recorded, the first digital data, and a second disk.
A first reproduction processing circuit for the first digital data, and a second reproduction processing circuit for the first digital data; a second reproduction processing circuit, the first disk and the second disk;
a control circuit to which playback control data for identifying the disk of the first playback processing circuit and the second playback processing circuit are supplied;
A disc playback device characterized in that a playback processing circuit is switched. 2. The disc playback device according to claim 1, wherein the playback control data is subchannel data that is not supplied to either the first or second playback processing circuit. .