KR930000989B1 - Apparatus for reproducing disk-shaped recording medium - Google Patents

Abstract

No content.

Description

[Name of invention]

Reproducing apparatus of disc type recording medium

[Brief Description of Drawings]

1 and 2 are schematic diagrams for explaining the data recorded on the disk.

3A to 3C are schematic diagrams for explaining the data of the Q channel of the sub-coating signal.

4 is a cross-sectional view for explaining the current compact disc.

5 is a schematic diagram for explaining a data configuration of digital data.

6, 7, 8, and 9 are cross-sectional views each showing some examples of the disk to which the present invention is applied.

10 is a block diagram of an example of a disc reproducing apparatus to which the present invention is applied.

11, 12, and 13 are schematic diagrams for explaining the reproducing operation of the disc reproducing apparatus shown in FIG.

Detailed description of the invention

[Technical Field]

The present invention relates to an apparatus for reproducing a disc-shaped recording medium suitable for use, for example, for a digital audio disc.

[Background]

A system using an optical digital audio disc (called a compact disc) uses an error correcting code with high correction ability and is a disc system capable of reproducing high quality stereo music. By using the same error correction code as the compact disc, the characters are represented together with the stereo music data in the same signal format, and the data, still image data, and game programs are recorded. It is possible to play still images, display composers, song names, etc., and play music suitable for games, thereby extending the application of the compact disc system. The data storage capacity of the current compact disc is about 500M bytes per disc, and both stereo music data and digital data can be recorded on one disc.

However, many types of current discs in which only stereo music data is recorded have already been sold. Discs in which both stereo music data as described above and other digital data are recorded are recorded with existing stereo music data. It is preferable that the conventional disc reproducing apparatus capable of reproducing compact discs can reproduce stereo music data without any problem.

On the other hand, as the disc reproducing apparatus as described above, it is preferable that both the current disc and the disc on which the two kinds of data as described above are recorded can be reproduced, and furthermore, the disc on which only digital data is recorded can also be reproduced. . In other words, only one type of disc that records stereo music of the same program is manufactured, and a person who has already purchased a disc playback device can enjoy high-quality stereo music playback as before, and a display device or the like A person having a new type of disk player added to the disk player can enjoy both stereo music playback and still picture playback depending on the purpose.

However, the existing disc reproducing apparatus is for the purpose of reproducing stereo music only. Therefore, if a disc containing digital data other than music data such as still data is recorded as it is, a large level of noise is generated and the speaker is damaged. Problems occur. Therefore, it is necessary to ensure that digital data other than stereo music is not reproduced even when reproduced by an existing disc reproducing apparatus. As one method, it is conceivable to record digital data in a pause section of a grain stem. However, in the pause section, it is not only soundless, and the fade in / out process is sometimes performed. Therefore, the existing disc playback apparatus is not configured to mute the pause section. Therefore, digital data cannot be recorded in the pause section.

[Initiation of invention]

Accordingly, an object of the present invention is to reproduce, for example, any of a current digital disc in which only stereo music data is recorded and a disc in which two types of data, for example, stereo music data and still-recorded data, are recorded. An object of the present invention is to provide a disc reproducing apparatus capable of preventing the generation of noise even when reproducing digital data.

In order to achieve these technical problems, in the present invention, a first disc-shaped recording medium in which only a first data signal is recorded, and a second disc-type in which both the first data signal and the second data signal are recorded. A reproducing apparatus for a disc-shaped recording medium in which any of the recording media is reproduced, comprising: a first reproducing processing circuit for reproducing the first data signal and a second reproducing process for reproducing the data signal of the second circuit A circuit and a control circuit to which reproduction control data for identifying the first disc-shaped recording medium and the second disc-shaped recording medium obtained by reproducing the identification data recorded on the innermost circumference of the disc is supplied. The output of the control circuit switches the control of the reproducing operation to the pickup and switches between the first regeneration processing circuit and the second regeneration processing circuit. To configure a playback device of a disk-shaped recording medium as set.

Best Mode for Carrying Out the Invention

One embodiment of the present invention applies the present invention to a compact disc.

The data structure when the signal recorded on the compact disc is audio data will be described with reference to FIGS.

1 shows a data stream recorded on a compact disc. 588 bits of the recording data is used as one frame, and a frame synchronization pulse FS of a specific bit pattern is inserted for each one frame, followed by a 3-bit DC voltage dividing bit RB after the frame synchronization pulse FS. The 14-bit 0-32th data bit DB and the 3-bit DC voltage divider bit RB are alternately arranged. This data bit is called a sub-coding signal or a user bit in the 0th of the DB, and is used for disc playback control and display of related information. The 1st to 12th, 17th and 28th data bits DB are allocated to the audio data of the main channel, and the remaining 13th to 16th and 29th to 32nd data bits DB are allocated to the parity data of the error correction code of the main channel. In each data bit DB, 8-bit data is converted into 14 bits by 8-14 conversion at the time of recording.

FIG. 2 shows a state in which each data bit DB is 8 bits except 98 DC suppression bits, and 98 frames are sequentially reduced in parallel. The sub-coding signals P to W of the frames 0 and 1 form a sync pattern which is a predetermined bit pattern. For the Q channel, the CRC code for error detection is inserted in 16 frames on the end side of 98 frames.

The P-channel is a flag indicating poses and music, which are low level in music, high level in pose, and pulses of 2 Hz period in the lead-out section. Therefore, by detecting and counting these P-channels, the specified music can be selected and played back. The Q channel can further complicate the same kind of control, for example, by inputting the information of the Q channel to a microcomputer installed in the disc playback apparatus, and immediately shifting to another music playback even during music playback. I can choose a song. The other R channels to W channels are used to display the writer, composer, commentary, lyrics, and the like of the disc-recorded song, or to explain the voice.

Of the 98 bits of the Q channel, the first two bits become the sync pattern, the next four bits become the control bits, the next four bits become the address bits, the next 72 bits become the data bits, and finally for error detection. The CRC code of is added. The 96 bits of the Q channel have a data structure as shown in FIG. 3A in the lead-in track. A 72-bit data bit is inserted after the first to fourth control bits and the fifth to eighth address bits. The first 8 bits of the data bit are the track number TNR, of which 4 bits each change from 0 to 9 in decimal, and the track number TNR changes from (00) to (99). In lead-in track, it becomes (TNR = 00). The 8 bits after this track number TRN are the points, followed by 4 bits for the minute, the next 4 bits for the second, and the next 4 bits for the frame (75 frames for 1 second). do. From the 49th bit, all 8 bits become 0, and the next 4 bits are data of minutes, seconds, and frames.

In lead-in track and music programs, data of minutes, seconds, and frames that change with elapse of time from 0 minute 0 second 0 frame to the end of the lead in track or music program are inserted. In the lead-in track, TOC (Table of Contents) data indicating the recording contents of the disc is recorded, and data in points, minutes, seconds, and frames of points are TOC data. In other words, the start position of each music program of the track number inserted as a point is inserted into the Q channel data of the lead-in track in minutes, seconds and frame values.

If the data of the point is A0 (hexadecimal display), the data represented by PMIN represents the track number of the first music program on the disc, and the seconds and frames at that time become zero. If the data of the point is A1, the minute data represents the track number of the last music program on the disc, and the data of seconds and frames at that time become zero. If the data of the point is A2, minutes, seconds, and frame data are represented by the start position of the lead-out track.

As described above, the Q-channel data is recorded in the lead-in track, but no main channel, that is, stereo music data is recorded. Stereo music data is also not recorded in the lead-out area. The current compact disc specification permits the presence of up to four bits of data, including the least significant of 16 bits.

3B shows the bit arrangement of the data of the Q channel in the program area. The first 4 bits are the control bits, the next 4 bits are the address bits, and the next 8 bits are the track number TNR. As described above, in the lead-in track (TNR = 00), in the program area (TNR = 01 to 99), and in the lead-out track (TNR = AA). The lead-out track is started at the end position of the last music program recorded on the disc.

The next 8 bits of the track number TNR are index X. The index divides each music program again, starting from 01 and can be changed up to 99 by one. In the pause period, it is always (X = 00). The data of the next minute, second, and frame after index X represents the elapsed time from the start to the end of each music program or pose. In addition, each data of minute (A MIN.), Second (A SEC.), And frame (A FRAME) following all zero-bit data of 8 bits starts from the beginning of the program area and ends at the end of the readout track. Absolute time data indicating elapsed time. The data recorded on the compact disc can be accessed using this absolute time code.

The control bits inserted in the above-described Q channel are determined as shown in FIG. 3C. In FIG. 3C, X means an undefined bit which may be either 0 or 1. The coat roll bit (00x0) means 2-channel audio data that is not pre-emphasized, and (00x1) means 2-channel audio data that is pre-emphasized. The control bit (10xx) (01x1) is not defined yet. (01 × 0) means that digital data, for example stills data, is recorded. (×× 0 ×) means prohibiting copying of the digital data as it is, and (×× 1 ×) means allowing digital copying. In one embodiment of the present invention, the control bit is set to (01 x 1) in the case of a disc on which both stereo music data and digital data are recorded.

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

In Fig. 4, 1 represents the current compact disc, and 2 represents the central hole. The compact disc 1 is irradiated with laser light for reproduction from the bottom surface thereof, and a reproduction operation is performed from the inner circumference side to the outer circumference side. The center hole 2 is 15 mm in diameter. (3) shows the clamping area (the range from 26mm in diameter to 33mm in this position) in which the compact disc 1 is supported when the compact disc 1 is attached or detached, and (4) the program area (50mm in diameter to 116mm). Range), and (5) indicates an information area (range from 45 mm in diameter to 118 mm in diameter). On the inner circumferential side of the program area 4 in the information area 5, the start position 6 of the lead in track (at most 46 mm in diameter) is defined, and from the program area 4 in the information area 5, The maximum lead out position 7 is defined on the outer circumferential side.

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

5 shows a recording format of digital data. Digital data is (588 x 4 bytes 235 bytes), which is one block. In FIG. 5, the left channel and the up channel show correspondence with sample data of left and right channels of stereo music data. As described above, in the case of stereo music, since 6 x 2 x 2 = 24 bytes of data are recorded in the section defined by the frame synchronizing signal, the digital data is generated according to the same signal format (FIG. 1) as the stereo music data. Is recorded, one block (2352 bytes) is recorded from the 0th frame to the 97th frame. Therefore, the digital data can be recorded without disturbing 98 frames of the period of change of the sub-coding signal.

The first one byte of one block of digital data is all zero bytes, the next ten bytes are all one bit, and the next one byte is all zero bits. This 12-byte section serves as a header indicating the head of one block of digital data. After the header, one minute of each minute, second, sector, and mode data is added. Minutes, seconds, and sectors are addresses of one block, and sectors, like frames, are one sector at 75 sectors. Digital data such as still data is inserted into the remaining 2340 bytes except for the header, address (minutes, seconds, sectors) and mode.

Some examples of the disk to which the present invention is applied to record the above-mentioned digital data together with the stereo music data will be described with reference to FIGS.

The disc 11 shown in FIG. 6 sets the grand total information area 21, and sets the information area 5 from the position on the inner circumferential side of the grand total information area 21 to a predetermined position on the outer circumferential side. Stereo music data is recorded in the first program area 4 in the information area 5. The first lead-in track starting at the start position 6 of the first lead-in track is disposed on the inner circumferential side of the first program region 4, and the maximum lead-out is provided on the outer circumferential side of the program region 4. The first lead-out track is disposed up to the position 7. The sub lead signals recorded in the first lead in track, the first lead out track, and the first program area 4 are the same as the current compact disc. However, the control bit in the Q channel data recorded on the first lead-in track (track number TNR = 00) is (01 × 1), and the disc is recorded with both stereo music data and digital data. Is displayed.

As will be described later, when the control data is read by the disc reproducing apparatus, the playback start position jumps to the start position of the first lead-out track, and the track number TNR (= AA) of the first lead-out track is The reproduction operation of the disc is controlled so as to be ignored and reproduced to the outer peripheral side of the disc.

The second lead-in area 22 is disposed on the outer circumferential side of the information area 5 in the total information area 21, and the second program area 23 is provided on the outer circumferential side of the second lead-in area 22. ) Is excreted. On the outer circumferential side of the second program area 23, a second lead out track is disposed up to the second maximum lead out position 24. As shown in FIG. In the second program area 23, digital data of the data structure shown in FIG. 5, for example, still data is recorded. In the second lead-in area 22 and the second lead-out track, the sub-coded signals of the Q channel as shown in FIG. 3B are recorded. The track number TNR of the second lead-in area 22 is AD, and the track number TNR of the second lead-out track is AE.

In the second lead-in area 22, control information necessary for reproducing the disc 11 is recorded, and the disc reproducing apparatus has a first program area 4 and a second program area 23 in accordance with this control information. Play). The track number TNR of the second lead-out track is set to AE, and the reproduction operation is terminated by detecting this.

7 shows a disc 12 of another configuration. In the integrated information area 21, the disc 12 has a second program area 23 in which digital data is recorded, which is wider than the first program area 4 in which stereo music data is recorded. Are mainly recorded discs. In the first program area, the voice "This disc is not a disc for music and cannot be reproduced" is recorded in various languages such as Japanese, English, German, and Lancer. This is effective to prevent the possibility that the music may not be mistaken when a disc on which digital data has been recorded by the current compact disc reproducing apparatus is mistaken. Further, the new disc reproducing apparatus capable of reproducing the digital data of the second program area 23 may perform the operation of omitting the above-described reproduction of the audio data by the control information recorded in the second lead-in area 22. good.

The disk 13 shown in FIG. 8 mainly plays stereo music data like the disk 11 shown in FIG. The starting position 25 of the second lead in track is defined on the inner circumferential side of the starting position 6 of the first lead in track, and the second lead in area 22 is defined therebetween.

In the 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 the data of the Q channel. In the second program area 23, control information indicating a reproduction method of the first program area 4 and the second program area 23, and the like, are recorded at a position on the inner circumferential side to be reproduced first.

The disc 14 shown in FIG. 9 mainly plays back digital data like the disc 12 shown in FIG. Therefore, in the first program area 4, the disc is a disc in which digital data is recorded, and audio having contents indicating that it is not for music reproduction is recorded in multiple languages. The first lead-in area is disposed on the inner circumferential side of the first program area 4 from the start position 6 of the first lead-in track, and the second lead-in is further located on the inner circumferential side from the first lead-in area. The second lead-in area 22 is provided from the start position 25 of the track.

Discs 11, 12, 13, and 14 shown in Figs. 6 to 9, respectively, can reproduce both audio data and digital data by a disc reproducing apparatus of a new configuration. Audio data can be reproduced by the disc reproducing apparatus.

An example of a disc reproducing apparatus to which the present invention is applied will be described with reference to FIG. In Fig. 10, reference numeral 31 denotes a disc player, and the stereo music signal reproduced by the disc player 31 is subjected to 8-14 modulation (EFM) demodulation, error correction, interpolation, and D / A conversion. And the like, and are output to the output terminals 32L and 32R. In each of the output terminals 32L and 32R of the disc player 31, signals of the left channel and right channel of the reproduction stereo signal are obtained. The audio signal of each channel is supplied to the speakers 34L and 34R through the amplifiers 33L and 33R, respectively, and the user can reproduce stereo music.

When the disc reproduced by the disc player 31 is recorded with digital data other than a stereo music signal, the reproduced data of this disc is supplied to the serial and parallel conversion circuit 35. The serial / parallel conversion circuit 35 is supplied with a frame pulse and a bit clock synchronized with the playback data by the disc player 31, and data parallelized for each symbol (8 bits) is shown by the serial-parallel conversion circuit 35. These parallel data are alternately joined to the buffer memories 37 and 38 via the input switch 36. In addition, in connection with the serial and parallel conversion circuit 35, a control data separation circuit 40 is provided.

Reference numeral 41 denotes a controller made of a microcomputer. The controller 41 is supplied with control data from the separation circuit 40 and a sub-coding signal from the disc player 31. An identification code control bit indicating that the signal recorded on the disc reproduced in the Q channel of the sub-coding signal is both a stereo music signal and digital data) is inserted. The controller 41 generates a control signal for controlling the switching to the reproduction output signal of the disc player 31 based on this identification code, and supplies this control signal to the disc player 31.

The outputs of the buffer memories 37 and 38 are alternately read by the output switch 39 and supplied to the DMA controller 42. The buffer memories 38 and 38 are provided because the playback data of the compact disc is high speed. The DMA controller 42 is controlled by the controller 41.

The output of the DMA controller 42 is supplied to the data selector 43. The data selector 43 is controlled by the controller 41, and supplies the output data of the DMA controller 42 to other circuits according to the mode of the still picture mode and the digital data (program for games, etc.). In the still picture mode, the frame memory 45 is written to the frame memory 45 through the decoder 44 of the color picture data composed of the Y, U, and V components. The operation of the decoder 44 and the frame memory 45 is performed by the controller 41. The still image data repeatedly read out one frame to this frame memory 45 is converted into an analog color video signal by the D / A converter 46 and supplied to the CRT display 47.

In addition, when the digital data is a game program, the data is supplied from the data selector 43 to the data conversion circuit 48, converted into serial data of a predetermined format, and then the microcomputer system 50 via the interface 49. Supplied to.

The operation when the disc 11 shown in FIG. 6 is reproduced by the above-described disc reproducing apparatus, for example, will be described. As an example, as shown in FIG. 11A, four songs M ₁ , M ₂ , M ₃ , and (M ₃ ), (M ₃ ), with a pause interval in the first program area 4 of the compact disc 11, are provided. M ₄ ) is recorded, and still-frame data D ₁ , D ₂ , D ₃ , and D ₄ corresponding to each frame are recorded in the second program area 23. have.

When the disc player 31 reproduces the first lead-in track from the start position 6, it reproduces the TOC data of the Q channel of the sub-coded signal recorded in the lead-in track, and this TOC data is used for the disc player 31. It is supplied to the system controller and controller 41 of. If the control bit of the Q channel is (01 × 1), the pickup of the display 31 does not reproduce the program area 4 as shown in Fig. 11B, but jumps to this area to make the first read. The playback operation starts again from the start position of the outtrack.

When the first lead-out track is reproduced, the second lead-in area 22 is reproduced, and the control data DR reproduced in this area 22 is passed through the serial-parallel conversion circuit 35 and the separation circuit 40. It is supplied to the controller 41. Next, the first still data D ₁ is reproduced. Data of the address and mode in the still data D ₁ is supplied to the controller 41 through the separation circuit 40, and the reproduced digital data is supplied to the decoder 44 by the data selector 43. The still data D ₁ is written into the frame memory 45 through the buffer 37 or 38, the DMA controller 42, the data selector 43, and the decoder 44. When TOC data is reproduced from the first lead-in area, muting is performed in which no audio output occurs during reproduction of the second lead-in area 22 and the second program area 23.

When the as shown in Figure 11b, ends the reproduction of the still screen data (D ₁₎ the pick-up to come back to the start position of the music of ₁ (M 1) and reproduces a song (M _1). In this case, as shown in FIG. 12, the still image data D ₁ is repeatedly read from the frame memory 45, and the still image is reproduced by the CRT display 47. FIG. Thus, while listening to the song M ₁ , it is possible to view the still image reproduced by the CRT display 47. When the reproduction of the song M ₁ is finished, the pickup is rapidly transported to the outer circumferential side as shown in FIG. 11B, and the reproduction of the still data D _{2 in} the second program area 23 is started. Where in the second program area 23 is the still data (D ₁ ) to (D ₄ ) recorded is the TOC data recorded in the first lead-in area or the second lead-in area 22. This is indicated by the control data recorded in.

The reproduced still data D ₂ is processed in the same manner as the still data D ₁ , and the music M ₂ is reproduced by the speakers 34L and 34R as shown in FIG. The artist is reproduced by the CRT display 47. In the same manner, the still data D ₃ , the music M ₃ , the still data D ₄ , and the music M ₄ are sequentially reproduced, and the second lead-out area is reproduced after the music M ₄ is reproduced. Upon reproducing, it is determined that all reproducing is completed, and the reproducing operation ends.

The disc 11 can also be reproduced by a reproducing apparatus for reproducing a disc on which only stereo music is recorded. That is, reproduction of the first lead-in track is started from the start position 6 of the disc 11, and TOC data is reproduced. Even if the control bit of the Q channel in this first lead-in track is set to (01 × 1), the conventional disc player cannot read this control bit, and its meaning is ignored. Therefore, after the first lead-in track, the songs M ₁ , M ₂ , M ₃ , and M ₄ are sequentially reproduced as shown in FIG. 13, and the first lead-out track is reproduced. Upon reproducing, the reproducing operation is finished as the reproducing operation is completed. Therefore, by reproducing control data DR or still data D ₁ to D ₄ without reproducing the outer circumferential side of the first lead-out track, it is possible to prevent noise from occurring. .

The discs 12, 13, and 14 shown in Figs. 7 to 9 are also played back as described above.

The disc reproducing apparatus shown in Fig. 10 can also reproduce a disc on which only stereo music is recorded or a disc on which only digital data is recorded. That is, the reproduction signal processing circuit is switched by the control bits in the Q channel reproduced from the first lead-in area, and the muting of the reproduction system of the audio data is performed.

The present invention can be applied not only to optical disks but also to magnetic disks and capacitive disks.

According to the present invention, it is possible to reproduce a disc on which both the first digital data and the second digital data are recorded, and to prevent noise from being generated by digital data other than audio data at the time of reproduction. In the present invention, since the identification data determines whether the data recorded on the disc is both the first and second digital data or only the first digital data, the example in which only the first digital data is recorded is recorded. For example, the current compact disc can be played without any problems.

Claims (2)

Disc-type recording in which either of the first disc-shaped recording medium in which only the first data signal is recorded and the second disc-shaped recording medium in which both of the first data signal and the second data signal are recorded are redone. A medium reproducing apparatus comprising: a first reproducing processing circuit for reproducing the first data signal, a second reproducing processing circuit for reproducing the second data signal, and the innermost circumference of the disc; And a control circuit to which reproduction control data for identifying the first disc-shaped recording medium and the second disc-shaped recording medium obtained by reproducing the identification data is supplied, and the output of the control circuit is adapted to the pickup operation. And the second reproducing processing circuit is switched over at the same time as the control is switched. The apparatus of claim 1, wherein the playback control data is data of subchannels which are not supplied to any of the first and second playback processing circuits.