JPH07272402A - Optical disc apparatus - Google Patents

Abstract

PURPOSE:To form an optical disc apparatus which enables common reproduction for a new-scale 7cm CD having am audio data alone in conformity to MPEG recorded therein, a normal 8cm/12cm CD (CD-DA) and a VCD by altering the basic format of video CD (VCD) standard. CONSTITUTION:A signal processing circuit 11 has a CD-ROM decoder 22 and an MPEG decoder 26 built thereinto in a circuitry which enables the setting of a through pass mode with switching circuits 24 and 28. Whether the CD is a CD-DA or a CD-ROM is judged based on a control bit of TOC information of an optical disc 1 and further, in the case of the CD-ROM, whether it is 7cm CD or VCD is checked from an information section of a first track. A CPU 14 controls the switching circuits 24 and 28 based on the results of the judgment and checking to set up a decoding state corresponding to individual discs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device,
MPEG (Moving Picture Image Coding Experts Grou
In an optical disc device for recording / reproducing a new standard optical disc dedicated to audio by changing the video CD (Video Compact Disc; hereinafter referred to as “VCD”) standard for performing data compression by p. , An ordinary CD with an outer diameter of 8 cm and / or 12 cm (hereinafter referred to as "CD-D
A)) and VCD related improvements.

[0002]

C as an optical disk for audio reproduction
About 10 years have passed since D (Compact Disc) was put on the market,
As a recording medium for audio information, it has already outstripped conventional cassette tapes and has been remarkably popular. The physical / logical format of a digital disc, CD, has been established as an EFM modulation recording method of 8-bit fixed data length symbols and a data format method of subcode, audio data, CRC, etc., and various application functions are added. CD players have been developed.

Further, the CD is identified by the control bit (4 bits) of the Q channel in the subcode, and the CD-ROM (Read Only Memor) for data is identified.
It is also used as y), and its use is expanding in the field of electronic publishing by effectively utilizing the large capacity and high-speed accessibility of digital disks. In particular, among the usage modes as a CD-ROM, karaoke CD (CD moving image karaoke) standard discs for the purpose of playing music and simple moving images have been widely distributed with the spread of karaoke.

By the way, recently, the karaoke CD (C
The VCD standard, which is an extension of the D movie karaoke standard, has been compiled, and while the karaoke CDs up to that point have been mainly used for business purposes, they are expected to be applied to household karaoke devices. This VCD standard is summarized by the following specifications, and it is possible to provide not only simple video playback but also music / education / electronic publishing software that combines video and still images. Has a range of use. Physical format: CD-ROM (XA) Digital video: ・ MPEG1 compliant ・ Pixel size (number of pixels) / frame frequency; 352 × 240 / 29.97Hz (NTSC), 352 × 240 / 23.976Hz (film), 352 × 288 / 25Hz (PAL) ・ Data transfer rate; Max. 1.152Mbit / sec ・ Video pack; 2296 bytes Digital audio: ・ MPEG1 ・ Layer 2 ・ Sampling frequency; 44.1kHz ・ Data transfer rate: 224kbit / sec ・ Audio pack ; 2279 bytes Playback time: Up to 74 minutes Number of still picture pixels: Standard level; 352 x 240, high definition level; 704 x 480 Playback specification: Menu playback using normal playback, slow, pause, etc. playback control Video signal output : NTSC / PAL Application fields: movies, karaoke, music, education, photo albums, etc.

The VCD has the following specific characteristics. (1) MPEG decoder and RAM in conventional CD player
Can be supported by the system with the addition of. In addition, the existing CD-I FMV (CD-Interactive Full Motion Vide
It is compatible with o). (2) The data of the entire disc has the structure (C
It complies with Form 1 of the D-ROM XA specification), and file management is performed according to the ISO9660 format. In particular, a VCD information (INF / VCD) portion is provided in the first track portion, and various disc information can be recorded. (3) The recording format of video data and audio data complies with MPEG1, and the video side has about 1.2.
M bit / sec and about 0.2 M bit / sec are allocated to the audio side. (4) The audio data recording format is MPEG
1-Layer 2 is used and the coding rate is set to 224 kbit / sec. (5) The track structure is as shown in FIG. 5, and on the disc, the video sector and the audio sector are interleaved and recorded in the MPEG data part at an average ratio of about 6: 1. (6) The video and audio sector formats are as shown in Figures 6 and 7 (the numbers in parentheses indicate the number of bytes), and packed in 2324 bytes, which is the user data area of one sector of the CD-ROM. One pack is composed of a header and pack data. Therefore, the MPEG video sector (VS) and audio sector (AS) are interleaved, for example, as shown in FIG. 8, and the average ratio of each sector VS and AS is about 6: 1 as described above.

On the other hand, in addition to the above-mentioned CD and an audio disc such as a karaoke CD which is a variation of the above-mentioned CD, MD (Mini Disc) which is a digital disc capable of recording / reproducing.
Disc) has been developed and high-quality audio information similar to that of a CD can be recorded / reproduced by a smaller disc device, so that its spread is expected in parallel with the CD and the like. In this MD, a unique data compression technique and data format different from those of the CD and its variations are adopted. That is, in MD, ATRAC (Adaptive
Data compression by Transform Acoustic Coding) is performed, and link sector (3 sectors), sub data (1 sector), compressed audio data (32 sectors) are recorded with 36 sectors (1 sector is 2352 bytes) as 1 cluster. And its unique data compression method
The outer diameter size of a normal CD is 120 mm, while M
In D, by adopting ATRAC, audio information equivalent to CD (recording / playback time:
You can record up to 74 minutes.

By the way, in the above VCD and MD,
VCD is an international standard method for data compression, M
While the PEG is adopted and the playback device can be constructed with the improvement of adding an MPEG decoder to the CD player, the MD is a dedicated format because it uses the original format and special compression technology of the proposing organization. It can only be played on the playback device.

The VCD, which records video data and audio data as described above, is MPEG.
Therefore, if converted into the data amount of only audio data, it becomes possible to record the same amount of audio information in an area much smaller than the recording area of the normal CD standard. In other words, although it becomes compressed data, a disc having an outer diameter much smaller than that of a normal CD can record audio information equivalent to that of a CD, and an audio disc comparable to an MD can be constructed. .

From such a viewpoint, the applicant of the present invention has
A new standard audio disc that is a variation disc of CD with a very high recording density of audio information and is capable of recording / reproducing equivalent audio information of a size comparable to that of MD. Was proposed (Japanese Patent Application No. 6-24728). The disc has an outer diameter of about 7 cm, and the VCD standard data format is used as a basic format, and an audio-only code is recorded in the information section of the first track in the basic format, and is recorded in the second and subsequent tracks. This is an optical disc (hereinafter referred to as "7 cm CD") in which all sectors are audio sectors of a data compression method compliant with MPEG. More specifically, FIG.
There is a standard related to the size, etc., and the outer diameter is 70 mm.
The area of 50 to 66 mm in diameter is used as the data area, and the sectors on and after the second track are MPE as shown in FIG.
The G audio sector makes it possible to record about 74 minutes of audio data in the data area.

[0010]

By the way, the above-mentioned 7 cm
When playing a CD on an optical disk device, an MPEG decoder is naturally required in the signal processing circuit because the audio sector is MPEG data, but the CD-DA, which has already become widespread for users, is also shared and played. It is convenient if possible, and since the 7 cm CD uses the VCD standard data format as the basic format,
It is easy to play back D as well.

Therefore, according to the present invention, 7 cm CD and CD- which have different data formats within the range of CD variation.
It was created for the purpose of providing an optical disk device capable of loading DA and VCD, discriminating and confirming the types of these disks and automatically reproducing them.

[0012]

[Means for Solving the Problems] The first invention is a 7 cm CD.
In an optical disc device capable of reproducing a CD
-A discriminating means for discriminating between a CD-ROM and a CD-DA based on the control bit of TOC (Table of Contents) information read from the loaded optical disc and a CD-ROM by the discriminating means. If it is determined that the loaded optical disk is 7 cmC
A confirmation means for confirming whether or not an audio-only code exists in the information section on the assumption that it is D, and a CD.
MP with decoder for signal processing and MPEG decoder
A signal processing means capable of switching the EG decoder between a decoding mode and a through-pass mode and the discrimination means discriminates that it is a CD-ROM, and the confirmation means confirms the existence of the audio exclusive code of the information section. In this case, the MPEG decoder of the signal processing means is set to the decode mode, and the discriminating means is the CD-DA.
If it is determined that the MPE of the signal processing means
The present invention relates to an optical disk device characterized by being provided with a switching means for setting the G decoder to the through-pass mode and enabling reproduction of 7 cm CD and CD-DA.

According to a second aspect of the present invention, in the optical disc device of the first aspect, a VCD can be loaded, and the signal processing means is a C
A CD-ROM (XA) decoder for decoding format data of the D-ROM (XA) standard is provided, and an MPEG decoder and a CD-ROM (XA) are provided by a switching means.
When the decoder can be set to the decode mode and the through-pass mode respectively, the discriminating means discriminates that it is a CD-ROM, and the confirming means confirms the audio exclusive code of the information section, the switching means performs the signal processing. When the CD-ROM (XA) decoder of the means is set to the through-pass mode and the MPEG decoder is set to the decode mode, the discriminating means discriminates that it is a CD-ROM, and the confirming means confirms the VCD code of the information section. The switching means sets both the CD-ROM (XA) decoder and the MPEG decoder of the signal processing means to the decode mode, and the discriminating means sets the CD.
-When it is determined to be DA, both the CD-ROM (XA) decoder and the MPEG decoder are set to the through-pass mode, and the reproduction of 7 cm CD, VCD and CD-DA is enabled. The present invention relates to an optical disk device.

[0014]

[Action]

About the first invention; This invention is 7cmCD and CD-DA
The present invention relates to an optical disc device for sharing and reproducing. The discriminating means discriminates whether the loaded optical disk is a CD-ROM or a CD-DA. However, since the CD-ROM includes a VCD and the like, the CD-
If it is determined to be a ROM, the confirmation means confirms that the information section of the optical disc is an audio-only code and certifies that it is a 7 cm CD.

By the way, for CD-DA, CIRC
While the (Cross Interleave Read Solomon Code) code can be decoded and directly reproduced, the 7 cm CD audio data is compressed by the MPEG system, and therefore the signal processing means is provided with an MPEG decoder. And
If the discriminating means discriminates CD-DA, MPE
Since it is not necessary to perform G decoding, the switching means sets the MPEG decoder to the through-pass mode so that only the normal CD signal decoding processing is executed, while the discriminating means and confirming means certify that the CD is 7 cm CD as described above. If so, the MPEG decoder is set to the decode mode to decode and reproduce the MPEG audio data.

Regarding the second invention: The present invention relates to an optical disk device capable of reproducing a 7 cm CD and a CD-DA according to the first invention as well as a VCD.
Since the data format of the VCD is the specification of the CD-ROM (XA) format, a CD-ROM (XA) decoder is further added to the signal processing means, and the decoder is the decoding mode and the through-pass mode like the MPEG decoder. Can be set.

When the discriminating means discriminates the CD-ROM and the confirming means confirms that the information portion of the optical disk is the VCD code, the switching means makes the CD-ROM of the signal processing means. (X
A) Both the decoder and the MPEG decoder are set to the decode mode to decode and reproduce the audio / video data of VCD.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the optical disk device of the present invention will be described in detail below with reference to FIGS. First, FIG. 1 shows a system circuit diagram of an optical disk device. In the figure, 1
Is a CD-DA standard or 7 cm CD standard or VCD standard optical disk (a phase change disk in this embodiment) loaded in the apparatus, 2 is a spindle motor, 3 is a read / write section, 4 is a spindle servo section, and 5 is Focus / tracking servo unit for the read / write unit 3, 6 is a servo control circuit, 7 is an RF amplifier for amplifying the read signal of the read unit 3, 8 is a reproduction decoder for EFM demodulating the amplified read signal, and 9 is a laser A laser driving unit that performs power control (constant during reproduction, modulated by recording information during recording), 10 a recording encoder that EFM-modulates signal-processed data, 11
Is a signal processing circuit, 12 is an audio / video signal output analog system circuit including a D / A converter, 13 is an audio / video signal input analog system circuit including an A / D converter, and 14 is a signal processing circuit 11. CPU to control, 15 is C
An operation unit provided with various operation buttons including a D-DA / 7 cm CD / VCD selection button, 16 is a display unit, and 17 is a CPU for controlling the entire system.

As shown in FIG. 1, the feature of the apparatus of the present embodiment is that a signal processing circuit 11 and a CD-DA signal processing section 20 for executing CIRC encoding / decoding, error detection and correction,
The encoder 21 and the decoder 22 related to the CD-ROM (XA) format, the switch circuits 23 and 24 forming the through-pass circuits of the encoder 21 and the decoder 22, the encoder 25 and the decoder 26 related to the MPEG, and the encoder 25 and the decoder 26 Switch circuits that make up the through path circuit 27, 28
In the recording mode, the CD-DA signal processing unit 20 is used in the reproducing mode by inputting a selection instruction from the operating unit 15.
The connection state of each switch circuit 23, 24, 27, 28 is switched by the control of the CPU 14 based on the decoding processing data obtained from the above.

First, in the recording mode, when the operator sets the recording mode from the operation section 15 and turns on the format selection button corresponding to the standard and recording format of the loaded optical disk 1, the CPU 17 sends the selection signal. CD-D that notifies CPU14 and CPU14 is selected
Switch circuit 23,27 corresponding to A / 7cmCD / VCD
Control the connection status of. That is, the switch circuits 24 and 28 of the output system are set in the floating state by the setting of the recording mode, and when the CD-DA format is selected, the switch circuit 23 is connected to the e side and the switch circuit 27 is connected to the g side. When both encoders 21 and 25 are set to the through pass mode and the 7 cm CD format is selected, the switch circuit 23 is set to the e side and the switch circuit 27 is set.
Are connected to the h side, the encoder 21 is set to the through-pass mode, the encoder 25 is set to the encode mode, and V
Switch circuit when CD format is selected
23 is connected to the f side and the switch circuit 27 is connected to the h side so that both encoders 21 and 25 are set to the encode mode.

Further, by setting the recording mode, the servo control circuit 6 sets the rotation speed of the SP motor 2 and the focus of the reading unit 3 to the optimum values by the spindle servo unit 4 and the focus / tracking servo unit 5, and the reading / writing unit. The position of 3 is set to the recording start position of the optical disc 1.

When a recording signal is input through the input analog system circuit 13, in the selected state of the CD-DA format, only the CD-DA signal processing unit 21 performs the CIRC encoding process and the encoding is performed. Encoder for recording signals
The data is output to an optical disc (CD-DA) 1 and recorded in an ordinary CD standard format, and when the 7 cm CD format is selected, the data compressed by the MPEG method by the encoder 25 is recorded on the CD-DA. Signal processing unit 21
Then, the CIRC encoding process is performed on the optical disc, and the encoded signal is output to the recording encoder 10 to the optical disc (7 cm CD) 1 7c.
Recording is performed in the mCD standard format, and in the selected state of the VCD format, the encoder 25 performs the compression processing of the MPEG system, and the audio / video data after the compression processing is converted by the encoder 21 into the interleaved format corresponding to the VCD standard. CD-D for data
After the A signal processing unit 21 performs the CIRC encoding process, the encoded signal is output to the recording encoder and the optical disc (V
Recording on the CD) 1 in the VCD standard format. Also, based on the address information obtained from the pre-formatted portion or the pre-grooved portion of the optical disc 1, recording start / recording
Information on the end position, address, and time is recorded in the inner area of the optical disc as TOC information.

Next, the operation procedure in the reproduction mode is shown in FIG.
This will be described with reference to the flowchart of FIG. First, the switch circuits 23, 24, 27, and 28 are in a floating state, and when the reproduction mode is set and a reproduction instruction is given from the operation unit 15 with the optical disc 1 loaded, the spindle is rotated as in the recording mode. -When the focus control is executed, the read / write unit 3 is moved to the inner area of the optical disc 1 to read the TOC information in that area.
(S1, S2). At this time, the TOC information is input from the RF amplifier 7 to the signal processing circuit 11 via the reproduction decoder 8.
The TOC information subjected to the CIRC decoding process in the CD-DA signal processing unit 20 of the signal processing circuit 11 is saved in the CPU 17 via the CPU 14.

By the way, the TOC information includes table of contents information such as program (music and video) numbers and address / time information recorded on the optical disc 1, but like the sub-coding of the data area, its Q channel is The frame structure is as shown in FIG. 3, and control bits (4 bits) and address bits (4 bits) are added prior to the data bits (72 bits) representing the above information. The control bits Q1 to Q4 indicate that when Q2 is "0", it is an audio disc.
In the case of "1", it indicates that it is a data disc, CD-DA is an audio disc, and CD-ROM (including 7 cm CD and VCD) is treated as a data disc. Therefore, the CPU 17 determines the type of the disk 1 from the contents of the saved control bits Q1 to Q4.

Now, the control bits Q1 to Q4 are "00".
If Q2 is "0" in any of "00" / "1000" / "0001" / "1001", the CPU 17 immediately returns the CD-
When the DA flag is turned on, and the CPU 14 detects that the flag is set, the CPU 14 connects the switch circuit 24 of the signal processing circuit 11 to the b side and the switch circuit 28 to the d side (S3 → S4, S5).
That is, it is determined that the loaded optical disc 1 is a CD-DA based on the fact that Q2 is "0", and the playback system CD is used.
-The ROM (XA) decoder 22 and the MPEG decoder 26 are set to the through-pass mode, and only the CD-DA signal processing unit 20 is set to the operation mode.

Then, the servo control unit 6 moves the read / write unit 3 to the first track of the optical disc 1 by the tracking servo unit 5, and thereafter, while executing the spindle tracking control by the servo control circuit 6, the first and subsequent tracks are executed. Is read and reproduced (S6). Specifically, the signal read from the optical disc 1 is amplified by the RF amplifier 7 and EFM demodulated by the reproduction decoder 8 to obtain the signal processing circuit 1.
1 is input to the CD-DA signal processing unit in the signal processing circuit 11.
In 20, CIRC decoding processing is performed, and the output analog system circuit 12 is output through a through-pass circuit composed of switch circuits 24 and 28.
Then, the output analog system circuit 12 performs D / A conversion to obtain an audio reproduction signal.

Next, the control bits Q1 to Q4 are set to "0".
When 100 "and Q2 is" 1 ", the CPU 17 assumes that the loaded optical disc 1 is a CD-ROM, and the servo control unit 6 causes the read / write unit 3 to read the first track of the optical disc 1. To read the track and check the code of the information section included in the first track (S3 → S7, S8) In this case, even if it is checked from the EFM demodulated data of the reproduction decoder 8. Good but
In this embodiment, the CD-DA signal processing unit 20 of the signal processing circuit 11
The CPU 14 detects the code of the information section which has been CIRC decoded at.

By the way, in the information section, as described in the standard of VCD and 7 cmCD, the normal VCD code is used in the case of VCD, and the audio exclusive code is used in the case of 7 cmCD which is the modified standard of VCD. It is recorded and the CPU 14 can confirm whether the loaded optical disk 1 is a 7 cm CD or a VCD based on the detected code.

Here, when the above-mentioned detection code is an audio-only code, the CPU 14 causes the signal processing circuit 11 to operate.
A switch control signal is output to switch the switch circuit 24 to the side b to put the CD-ROM (XA) decoder 22 in the through pass mode (S7, S8 → S9). That is, the optical disc 1 loaded by the detection of the audio-only code
Is assumed to be a 7 cm CD, but the 7 cm CD does not require decoding by the CD-ROM (XA) decoder 22 because the data area of each track is composed of only audio sectors as shown in FIG. At this stage, the switch circuit 28 is not controlled and kept in the floating state as it is.

After the switching of the switch circuit 24 is completed, it is detected that the CD-ROM is a C-ROM.
The PU 17 sets the preparatory reproduction mode, moves the read / write unit 3 to the second track of the optical disc 1 by the servo control circuit 6, and preliminarily reproduces the data on the track (S10, S11).

In this preliminary reproduction mode, the CPU 14
Data is directly fetched from the output side of the EG decoder 26,
It is confirmed whether or not the decoded data is in a normal MPEG format. If it is confirmed that the MPEG decoded data is normal, the 7 cm CD is immediately sent.
When the flag is turned on, a control signal is output to the signal processing circuit 11, and the switch circuit 28 is connected to the c side at this stage.
(S13-S15). That is, in this case, the optical disc 1 loaded with the audio-only code is a 7 cm CD
However, at that stage, it is not determined that the CD is a 7 cm CD yet, and the determination is confirmed after waiting for the confirmation result in the preliminary reproduction mode. Since the switch circuit 28 is kept in a floating state until this stage, the read / decoded data in the preliminary reproduction mode is not output to the output analog system circuit 12 side.

When the switch circuit 28 is connected to the c side through the above steps, the signal processing circuit 11 outputs the analog circuit.
It becomes possible to output MPEG decoded data to 12, CPU
The servo control circuit 6 causes the servo control circuit 6 to restart the reading operation from the beginning of the second track, and sequentially reproduce the audio data of the second and subsequent tracks (S16). In that case, in the signal processing circuit 11, the CD-DA signal processing unit 20 uses the CIRC.
The decoded data is transferred to the MPEG decoder 28 without passing through the CD-ROM (XA) decoder, and the data decoded by the MPEG decoder 28 is output to the output analog system circuit 12.

On the other hand, when the code of the information section is not the audio exclusive code but the VCD code in step S8, the CPU 14 outputs the switch control signal to the signal processing circuit 11 and the switch circuit 24
The CD-ROM (XA) decoder 22 is set to the decode mode by connecting it to the side (S8 → S17, S18). That is, the VCD has an audio sector (AS) and a video sector (VS) as shown in FIG.
Are interleaved, it is necessary to decode the CD-ROM (XA) format, and the CD-ROM (XA) decoder 22 is set to the decode mode.

At that stage, the switch circuit 28 is not controlled and is kept in the floating state.
And the procedure related to the preliminary playback mode after that is 7 cm
This is executed in the same manner as in the case of playing a CD (S19 to S22).
Therefore, in the preliminary reproduction mode, the data decoded by the CD-ROM (XA) decoder 22 is decoded by the MPEG decoder 28 and it is confirmed whether the decoded data is normal or not. The VCD flag is turned on and a switch control signal is output to the signal processing circuit 11 to connect the switch circuit 28 to the c side (S22 to S24).

When the switch circuit 28 is connected to the c side through the above procedure, the signal processing circuit 11 outputs the analog circuit.
It becomes possible to output MPEG decoded data to 12, CPU
The servo control circuit 6 causes the servo control circuit 6 to start reading again from the beginning of the second track and sequentially reproduce the audio / video data of the second track and thereafter (S25). In that case,
In the signal processing circuit 11, the CD-DA signal processing unit 20 uses the CIR
The C-decoded data is decoded by the CD-ROM (XA) decoder and transferred to the MPEG decoder 28.
The data decoded by is output to the output analog system circuit 12.

Even if it is discriminated as a CD-ROM in step S3, neither the audio exclusive code nor the VCD code is detected in steps S8 → S17, or normal decoded data cannot be obtained in steps S13 and S22. If this is the case, it is estimated that another variation disc that cannot be played back with this optical disc device is loaded.
The PU 17 transfers the display data relating to the unreproducibility to the display unit 16 and executes the display to that effect (S17, S13, S22 → S26).

As described above, the optical disk device of the present embodiment has a structure capable of recording / reproducing by sharing CD-DA, 7 cm CD and VCD, but it is a common structure of only CD-DA and 7 cm CD. Of course, the pre-reproduction mode is provided in this embodiment, but
This is to prevent a reproduction error due to a read error of the C information or the information part of the track, and if the reliability of the read is secured, it is not necessary to intentionally provide the preliminary reproduction mode. Further, in the present embodiment, since the optical disk device capable of recording / reproducing is used, the optical disk 1 is the phase change disk, but naturally, the optical disk may be a read-only optical disk. / CD-DA, 7cmCD, VC with the same procedure only by changing the writing unit 3 and the laser drive unit 9 to the magneto-optical system.
Shared playback of D can be performed.

[0038]

The optical disk device of the present invention has the following effects due to the above configuration. The invention of claim 1 is a new standard of 7 cm which has a recording density of audio data comparable to that of MD by modifying the VCD standard.
The CD and the conventional CD-DA can be shared and reproduced, and the 7 cm CD compatible optical disk device can be introduced without wasting the CD-DA which has already been widely used. According to a second aspect of the invention, in the optical disc device according to the first aspect, shared reproduction of VCD is further possible, and a multi-functional optical disc device including reproduction of video information is realized. According to the third aspect of the present invention, a reproduction error caused by a read error in the TOC information or the information portion of the track is prevented, and the reliability of the optical disk device is improved.

[Brief description of drawings]

FIG. 1 is a system circuit diagram according to an embodiment of an optical disk device of the present invention.

FIG. 2 is a flowchart showing an operation procedure in a reproduction mode of the optical disc device.

FIG. 3 is a diagram showing a frame structure of a Q channel of TOC information.

FIG. 4 is a diagram showing a data structure of an entire disc in the VCD standard.

FIG. 5 is a diagram showing a track configuration in the VCD standard.

FIG. 6 is a diagram showing a sector format of a video sector in the VCD standard.

FIG. 7 is a diagram showing a sector format of an audio sector in the VCD standard.

FIG. 8 is a diagram showing an interleaved recording mode of an audio sector and a video sector in the VCD standard.

FIG. 9 is a diagram showing a standard relating to a 7 cm CD size and the like.

FIG. 10: MPEG data when playing back a 7 cm CD
It is a figure which shows the content of (sector column).

[Explanation of symbols]

1 ... Optical disc (CD-DA / 7cmCD / VCD), 2 ... Spindle motor, 3 ... Read / write section, 4 ... Spindle servo section, 5 ... Focus / tracking servo section, 6 ...
Servo control circuit, 7 ... RF amplifier, 8 ... Reproduction decoder,
9 ... Laser drive section, 10 ... Recording encoder, 11 ... Signal processing circuit (signal processing means), 12 ... Output analog circuit, 13 ...
Input analog circuits, 14, 17 ... CPU (14; switching means / confirmation means, 17; discrimination means), 20 ... CD-DA signal processing section, 21 ...
CD-ROM (XA) encoder, 22 ... CD-ROM (XA) decoder, 23, 24, 27, 28 ... Switch circuit (22, 28; switching means), 25 ... MPEG encoder, 28 ... MPEG decoder.

Claims (3)

[Claims] 1. A video CD (V
The data format of the video compact disc standard is the basic format, and
An audio-only code is recorded in the information section of the track, and all sectors recorded after the second track are MPEG (Moving Picture Image Coding E
xperts Group) -compliant data compression audio sector optical disc (hereinafter referred to as "7cmCD") optical disc device, the outer diameter is 8
A normal CD (hereinafter referred to as "CD-DA") of cm or / and 12 cm can be loaded, and a CD-ROM (Read) is read based on the control bit of TOC (Table of Contents) information read from the loaded optical disc. Only Memory) or C
Discriminating means for discriminating whether the disc is a D-DA or not, and when the discriminating means discriminates that the disc is a CD-ROM, it is assumed that the loaded optical disc is the 7 cm CD and whether or not the audio exclusive code exists in the information section. Confirmation means for confirming whether or not, CD signal processing decoder and MPE
A signal processing means having a G decoder and capable of switching and setting the MPEG decoder between a decoding mode and a through-pass mode; and a discriminating means for discriminating a CD-ROM, and a confirming means for audio of the information section. When the presence of the dedicated code is confirmed, the MPEG decoder of the signal processing means is set to the decode mode, and when the determination means is CD-DA, the MPEG decoder of the signal processing means is set to the through-pass mode. Equipped with switching means for setting, 7 cm CD and CD-
An optical disk device capable of reproducing a DA. 2. The optical disc apparatus according to claim 1, wherein a video CD standard CD (hereinafter referred to as "VCD") can be loaded, and a CD-ROM (XA) standard format data is decoded in the signal processing means. A ROM (XA) decoder is provided, and the switching means allows the MPEG decoder and the CD-ROM (XA) decoder to be set to the decode mode and the through-pass mode, respectively. When the audio exclusive code of the information section is confirmed, the switching means is the CD-of the signal processing means.
The ROM (XA) decoder is set to the through pass mode and MPEG
The decoder is set to the decode mode, and the discriminating means C
When the VCD code of the information section is confirmed by the confirming means as well as the D-ROM, the switching means sets both the CD-ROM (XA) decoder and the MPEG decoder of the signal processing means in the decode mode. If the discriminating means discriminates the CD-DA, the switching means sets both the CD-ROM (XA) decoder and the MPEG decoder in the through-pass mode, and the 7 cm CD, VCD, and CD-DA. The optical disc device is characterized by enabling reproduction of. 3. The optical disc device according to claim 1 or 2, wherein when the discriminating means discriminates that the disc is a CD-ROM and the confirming means discriminates the audio exclusive code or VCD code in the information section, the preliminary reproduction mode is set. Then, the second track of the optical disk is read, and when it is confirmed that the read data is in a normal MPEG data format, the optical disk apparatus is set to enter the reproduction mode.