JP3368755B2 - Optical disc recording method and optical disc apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for highly efficiently encoding an audio signal and recording it on an optical disc, and an optical disc device for reproducing the information.

[0002]

C as an optical disk for audio reproduction
It has been ten years since D (Compact Disc) was put on the market, and it has already been remarkably popular as a recording medium for audio information, surpassing conventional cassette tapes. There are CDs having an outer diameter of 8 cm and 12 cm as optical recording media for audio information centering on such music, and are generally called CD-DA because they are CDs for recording digital audio. The physical / logical format of a CD, which is a digital disc, 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 a CD with various application functions added. A player is being developed. Also, CD
Is also used as a CD-ROM for data such as computers by identifying it with the control bit (4 bits) of the Q channel in the subcode, and effectively utilizes the large capacity and high-speed accessibility of the digital disc. Its application is expanding in the field of electronic publishing. Furthermore, a high-density disc called a DVD is about to be used as a digital disc for data in computers and the like. In this case, the EFMplus modulation recording method is adopted, but the EFM modulation recording method will be described. A digital disc is a CD or CD-RO.
An optical disk such as an M, a DVD, or a high-density DVD on which audio or video signals are recorded as digital signals.

By the way, in the above-mentioned CD-ROM, the voice is compressed by ADPCM, and the original sound quality cannot be reproduced by the compression, and recording with higher hi-finess is desired. In other words, even if compressed, it is expected that an audio disc having a sound quality superior to that of a normal CD and comparable to, for example, 20-bit recording will appear. From such a viewpoint, the applicant company has decided that the audio data, which was conventionally considered as 16-bit 2-channel digital data, has a quantization bit number of 16 or 20, and a sampling frequency of 44.1 kHz.
A recording device which performs quantization at a frequency of z or higher, performs data processing by orthogonal transform and / or Huffman code, performs compression for reducing the amount of data, and records in a CD-ROM format, and a recording method using the method. Considering the recorded optical disk, we have already filed several patent applications (hereinafter referred to as prior applications). This disc is called a CD-ROM audio to be discriminated from a normal data CD-ROM. The CD-ROM audio can have a sync and a header required for the ROM format, and the CD-DA. It is possible to record the above amount of audio data.

Further, in a digital disc called a DVD, sound is recorded without being compressed by the linear PCM, so that a data amount is required for recording with high hi-finess and the recording time is shortened. For this disc, data is processed by orthogonal transform and / or Huffman code to perform compression for reducing the data amount, and DV is used.
A recording device for recording in the D format and an optical disc (referred to as DVD audio) recorded by such a method are conceivable.

[0005]

By the way, the CD-RO
When playing M audio on a normal optical disk device,
Since the data is orthogonal transform and / or Huffman code data, the signal processing circuit naturally needs the orthogonal transform and / or Huffman code decoder, but CD-DA, which is already widespread for users, is also used. It is convenient if shared playback is possible, and CD-ROM audio is C
Since the data format of the D-ROM standard is the basic format, it is easy to share and reproduce the CD-ROM. Further, when the CD-ROM audio is recorded, the same compression method is not used throughout the CD, but if a compression method most suitable for the sound property of the program is selected and encoded for each track (program), The compression efficiency can be set appropriately.

As described above, when the compression method most suitable for the program is selected and encoded for each track, it is necessary to select the decompression decoding method corresponding to the reproduction. Furthermore, even in the same program, it may be more efficient to apply a compression method different from the main signal for signals other than the main signal such as the surround signal. It is necessary to select a method, record the information on the disc, and select a decompression decoding method corresponding to reproduction. Therefore, the present invention, when recording information, selects a compression method mode in subdivided units such as a program or channels therein, and also records a type signal indicating the compression method mode in an optical recording medium, and Or
An optical disk device capable of automatically setting an expansion decoding mode corresponding to a compression method mode at the time of recording information from an optical recording medium recorded by the above method and reproducing the track information or further subdivided information. The purpose is to provide.

[0007]

In order to achieve the above object, the present invention comprises means described in 1) and 2) below.
It That is,

1) A DVD audio disc
And audio that contains audio data
Optical disc having an audio sector consisting of a pack
A method of recording to an audio pack user
In the data area, an audio signal is quantized with a quantization bit number of 20 to 24 bits and a sampling frequency of 48 kHz or higher, and orthogonal transform encoding, Huffman code encoding and select one of the at least two compression methods modes of orthogonal transformation encoding and three compression methods mode both Huffman encoding to compress the amount of data, indicating the compressed data and compressed methods mode in sectors As a type signal , a predetermined sub of the user data area
And formatting to be received in the header, to record this <br/> formatting data on the optical disk
A method for recording on an optical disc, characterized by: 2) An optical disk apparatus capable of reproducing information from a recording light di <br/> disk by the recording method according to claim 1, in which has a DVD decoder, loading of
From optical disc to DVD audio disc
Means for detecting information identifying the bets, the detected information
According to the report, the optical disc is a DVD audio disc.
If it is specified, the type signal indicating the compression method mode when the information of the sector is recorded is detected based on the control bit of the sub-header information in the user data area of each sector read from the optical disc. Type signal detection means, decompression decoder means capable of setting at least two modes out of three modes of orthogonal transformation decoder, Huffman code decoder, orthogonal transformation decoder and cascade connection of Huffman decoder in response to the output signal of the DVD decoder, wherein the extended decoder means supplies the output signal of the DVD decoder, and said type signal is detected by the detection means the mode setting means for setting a mode of the extended decoder means according to the compression method mode, is the set
Original audio signal expanded and restored by
An optical disc device having means for taking out a signal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the invention
3 is a block diagram showing a recording / reproducing apparatus including an audio signal compression recording apparatus and an optical disc apparatus as Reference Example 1. FIG. The “optical disk device” refers to both a device including both a recording system and a reproducing system and a device including only a reproducing system. Similar to a conventional recording / reproducing apparatus or a reproduction-only optical disk apparatus, a spindle motor 2 for rotationally driving an optical disk 1 which is a phase change disk, an optical head 3 having a laser and an optical system, a spindle servo unit 4 for controlling the spindle motor 2, A focus / tracking servo unit 5 for controlling the optical head 3, a spindle servo unit 4,
A servo control circuit 6 for controlling the focus / tracking servo unit 5 and an RF for amplifying an output signal from the optical head 3.
A reproducing decoder 8 for EFM demodulating the signals from the amplifier 7 and the RF amplifier 7, a recording encoder 10 for EFM modulating a recording data signal subjected to a predetermined process, and an optical head at the time of recording according to the signals from the recording encoder 10. A signal having a laser driving unit 9 for controlling the power of 3 is supplied to the recording encoder 10 and a predetermined process is performed when the signal from the reproducing decoder 8 is supplied to the output analog system circuit 12. Since this content is an important part of the present invention, it will be described in detail later.

A CPU (Central Processing Unit) 14 controls the signal processing circuit 11, and its control content will be described later with reference to a flowchart. Another CP
A U (central processing unit) 17 receives an instruction from the operation unit 15 and controls the display unit 16 and the CPU 14 to control the entire optical disc device (system), and also performs a predetermined display on the display unit 16. . Before explaining the signal processing circuit 11, what the above-mentioned CD-ROM audio to which the reference example 1 is applied will be described with reference to a block diagram of its recording system. FIG. 9 shows a recording device disclosed in a patent application (Japanese Patent Application No. 7-236156) entitled "Audio signal compression recording device and audio signal compression device and optical recording medium" filed by the applicant company prior to the present application. It is a block diagram which shows the principal part of a compression device. See also FIG.
0 is a block diagram showing an example of the signal processing circuit in FIG.

Input terminal I of the recording device or the compression device of FIG.
An analog signal such as a music signal is supplied to N,
The output terminal OUT2 is connected to a CD master making machine (not shown), that is, a mastering device via a premastering device as necessary. The device of FIG. 9 has an A / D converter 31 connected to the input terminal IN, a signal processing circuit 32 connected to the output thereof, a memory 33 connected to the signal processing circuit 32, and an output of the signal processing circuit 32. Connected to CD-
ROM encoding circuit 34 and CD-ROM encoding circuit 34
It has a CD encoding circuit 35 connected to the output of.
The output of the CD-ROM encoding circuit 34 is the first output terminal OU.
It is connected to T1 and the output of the CD encoding circuit 35 is connected to the second output terminal OUT2. The CD encoding circuit 35 may be unnecessary.

The A / D converter 31 operates as a quantizing means for quantizing an audio signal at a quantization bit number of 20 bits and a sampling frequency of 44.1 kHz or higher. The sampling frequency is either 44.1 kHz or 88.2 kHz depending on the embodiment, but is 44.1 kHz.
It can be an appropriate value of Hz or higher. In the case of targeting a music signal, it is usually two channels on the left and right, but it may be four channels, six channels, or the like depending on the surround and other needs. Here, the case of two channels will be described. The quantized data obtained by the A / D converter 31 is a unit of 2 m pieces (m is a positive integer) per channel as a unit, and the quantized data is stored in the memory 3 via the signal processing circuit 32.
Written in 3. After that, the signal processing circuit 32
Start processing m data.

FIG. 10 is a block diagram showing an example of the signal processing circuit 32. The 2m pieces of data are orthogonally transformed by the orthogonal transformation circuit 40 to obtain a frequency spectrum. A plurality of filters 36a, 36b, 36c. ． ． It is given to the normalization unit / quantization unit 41 via the filter bank 36 having 36n and the switch circuit 37 as the selection means, and is normalized / quantized collectively for each band. Here, the normalization level (the number of bits) is used as auxiliary information, and the spectrum data is used as main information to form a data frame. This data frame is given to the Huffman coding circuit 38 to perform the Huffman coding process to reduce / compress the data amount and create a new data frame using the codebook index as auxiliary information and the processed data as main information. Then, this is sequentially written in the memory 33. Next, this new data frame is read from the memory 33, and the CD of FIG.
-Output to the ROM encoding circuit 34.

In the CD-ROM encoding circuit 34, a synchronization signal (SY) is added to each sector so that a predetermined format is obtained.
NC), a header, a subheader, etc. are added, and the compressed audio data given from the signal processing circuit 32 is arranged and outputted in the user data area of each sector. The output data of the CD-ROM encoding circuit 34 is output via the first output terminal OUT1, recorded on, for example, a magnetic tape, and supplied to a premastering device or a mastering device for manufacturing a read-only CD. On the other hand, in the case of a writable, so-called write-once type CD, the output data of the CD-ROM encoding circuit 34 is given to the CD encoding circuit 35, is CD-formatted, and has the second output terminal OU.
Recording is performed by a recording head (not shown) via T2.

Next, some aspects of the recording apparatus and the CD-ROM audio according to the above-mentioned prior application will be described with reference to FIG. FIG. 18 shows various formats of the CD in sector units. The first stage is a normal music CD.
In the following, various CD-ROMs are shown from the second stage to the sixth stage. There are roughly the following four modes as those shown in the above-mentioned prior application. However, it is further subdivided by the compression method. Further, in the present invention, a DV as a specific digital disc shown in FIG.
Including the case of applying to D, (5), (6) in that case
Two aspects of are shown. Although the number of quantization bits is 16 or 20 in the CD-ROMs (1) to (4), it may be 24 bits as in the DVD.

[0016]

[Table 1]   (1) CD-ROM (XA) mode 2, form 2 (6th row in FIG. 18)           Sampling frequency: 44.1 kHz           Number of quantization bits: 16 bits or 20 bits   (2) CD-ROM (XA) mode 2, form 2 (6th row in FIG. 18)           Sampling frequency: 88.2 kHz           Number of quantization bits: 16 bits or 20 bits   (3) CD-ROM mode 2 (4th row in FIG. 18)           Sampling frequency: 44.1 kHz           Number of quantization bits: 16 bits or 20 bits   (4) CD-ROM mode 2 (4th row in FIG. 18)           Sampling frequency: 88.2 kHz           Number of quantization bits: 16 bits or 20 bits   (5) DVD (Fig. 19)           Sampling frequency: 48kHz           Quantization bit number: 20 bits or 24 bits   (6) DVD (Fig. 19)           Sampling frequency: 96kHz           Quantization bit number: 20 bits or 24 bits

In the CD-ROM (XA) mode 2, form 2, the user data is 2324 bytes. Also, C
In D-ROM mode 2, user data is 2336 bytes. According to these standards, since the data amount of user data, that is, the number of bytes is relatively large, a large amount of data can be recorded and stored in one disk, which is advantageous. Also,
When the CD-ROM mode 2 of (3) and (4) above is used, a subheader of unique assignment can be defined as shown by the hatching in the fourth row of FIG. In the present invention, the CD-ROM mode 2 is used for recording the CD-ROM audio. CD-RO for reference
Table 2 shows the contents of the subheader in the M (XA) standard.

[0018]

[Table 2]

By using bits 5 and 2 of the submode byte in the subheader in the above CD-ROM (XA) standard for this encoded ID, it is possible to decode this format while looking at the subheader. Tables 3 and 4 below show the submode in the subheader and the content of the coding information. The conditions at the time of formatting can be recorded in the subheader, and there are two methods for that. One of them is a method of inserting the format condition of the sector, and the other is a method of recording the format condition by dividing it into a plurality of sectors. In this case, the information of the plurality of sectors can be collected and decoded. . CD-R
In the case of OM mode 2, the subheader of the original allocation can be defined as described above, but here, the CD-RO is used.
It is described that the contents are similar to those in the M (XA) standard.

[0020]

[Table 3]

[0021]

[Table 4]

In the above four modes, the sampling frequency is 88.
2 kHz, (2) and (4), 1 in 2 blocks
It constitutes a frame. Therefore, 44.1
The time that can be recorded is halved compared to the case of kHz.

The apparatus of FIG. 9 including the signal processing circuit 32 of FIG. 10 includes a quantizing means for quantizing an audio signal at a quantization bit number of 20 bits and a sampling frequency of 44.1 kHz or higher, and the quantizing means. Data compression means for compressing the amount of data by applying orthogonal transformation and Huffman code for each predetermined amount of quantized data quantized by the quantizing means, and CD-ROM (XA) for the data compressed by the data compressing means.
It has formatting means for formatting so as to be arranged in the user data area of standard mode 2, form 2 or mode 2 of the CD-ROM standard, and means for recording the data formatted by the formatting means in a recording medium as a CD format. It is an audio signal compression recording device.

FIG. 11 shows another prior application (Japanese Patent Application No. Hei 7-236153: the title of the invention is the same) of the applicant company filed together with the above prior application. The signal processing in FIG. It is a block diagram which shows the further another example of a circuit. This circuit differs from FIG. 10 in that the Huffman encoding circuit 38 is omitted and the number of quantization bits is different. That is, the apparatus of FIG. 9 including the signal processing circuit of FIG. 11 includes a quantizing means for quantizing an audio signal at a quantization bit number of 16 bits and a sampling frequency of 44.1 kHz or higher, and the quantizing means. A data compression means for compressing the data amount by applying an orthogonal transformation for each predetermined amount of quantized data quantized by the above; and the data compressed by the data compression means in the mode 2 of the CD-ROM (XA) standard, Audio signal compression recording apparatus having formatting means for formatting so as to be arranged in the user data area of form 2 or mode 2 of the CD-ROM standard, and means for recording the data formatted by the formatting means as a CD format on a recording medium. Is.

Further, FIG. 12 shows another prior application (Japanese Patent Application No. 7-236139) filed by the applicant of the present invention together with the above-mentioned prior application.
No .: title of invention is the same), and is a block diagram showing still another example of the signal processing circuit in FIG. This circuit differs from that of FIG. 10 in that the orthogonal transform circuit 40 is omitted and in the number of quantization bits, and includes the signal processing circuit of FIG.
Of the audio signal, the quantizing means for quantizing the audio signal at a quantizing bit number of 16 bits, a sampling frequency of 44.1 kHz or higher, and a predetermined quantity of quantized data quantized by the quantizing means. Data compression means for compressing the amount of data by applying the Huffman code to the data, and the data compressed by the data compression means for CD-ROM (XA) standard mode 2, form 2 or CD-ROM standard mode 2
The audio signal compression recording apparatus has formatting means for formatting so as to be arranged in the user data area, and means for recording the data formatted by the formatting means on a recording medium as a CD format.

The recording apparatus of FIG. 9 including any of the signal processing circuits of FIG. 10 to FIG. 12 corresponds to a portion including the recording system and the input analog system circuit 13 of the signal processing circuit 11 of FIG. The signal processing circuit 11 includes a CD-DA signal processing unit 20 that executes CIRC encoding / decoding, error detection and correction, and the like.
CD-ROM (mode 2) encoder 21, CD-RO
M (XA format) decoder 22A, CD-ROM
(Mode 2) Decoder 22B, Decoders 22A and 22B
Or a switch circuit 24 that configures a through-pass circuit that bypasses these, or an encoder 25A and a decoder 26A for orthogonal transform, an encoder 25B and a decoder 26B for orthogonal transform / Huffman code, and a switch circuit 27 for switching the encoders 25A and 25B. ,
Also, a switch circuit 28, which constitutes a through path circuit for switching between the decoders 26A and 26B or bypassing them, is built in. In the recording mode, the operation unit 15
CD-DA in playback mode by inputting selection instruction from
The switch circuits 24, 27 are controlled by the CPU 14 based on the decoding process data obtained from the signal processing unit 20.
The connection state of 28 is switched.

The recording system in FIG. 1 will be described. CD
-ROM encoder 21 is for mode 2
An orthogonal transform encoder 2 is used as a recording system compression decoder.
5A and an orthogonal transform / Huffman code encoder 25B are provided, and either one is selected by the switch circuit 27 and used. CD recorded on the recording system of FIG.
ROM audio 1 has a sector format shown in FIG.
As indicated by hatching in the fourth row of, the CD-ROM (mode 2) encoder 21 formats the first 8 bytes in the user data area to be used as a subheader. That is, the compression method at the time of recording can be displayed using this subheader. In particular,
Of the two signals of the orthogonal transform encoder 25A and the orthogonal transform / Huffman code encoder 25B, a signal indicating which is selected is a sector unit and the lower 2 bits of the coding information in the subheader (see Tables 2 and 4 below). Record it in. By recording the compression method in sector units in this way, it is possible to change the compression method in subdivided units such as for each track (program) or each channel in the track, and at the time of reproducing the information. It can be read and appropriate decompression decoding can be performed. The CPU 14 controls the switch circuit 27, sends a type signal indicating which compression method mode is used to the CD-ROM (mode 2) encoder 21, and writes the type signal in the subcode in the user data area.

First, in the recording mode, the operator sets the recording mode from the operation unit 15, loads the optical disc 1, and selects the compression method mode for each audio signal to be recorded or each predetermined channel thereof. If you select the compression method mode selection button (not shown),
The CPU 17 notifies the CPU 14 of the selected compression method mode, and the CPU 14 controls the connection state of the switch circuit 27 in accordance with the selected compression method mode.

By setting the recording mode, the reproducing system switch circuits 24 and 28 are set in a floating state. Now
When the information is recorded in the CD-ROM audio and the orthogonal transformation is used for the program of the first track as the compression method, the switch circuit 27 is connected to the g side,
The encoder 25A is set to the encode mode. After the recording of the first track is completed, the switch circuit 27 is connected to the h side and the encoder 25B is set to the encode mode when the second track is compressed by the orthogonal transform / Huffman code. This switching does not have to be performed in track units, but can be performed in channel units or other units (minimum is sector units).

Further, by setting the recording mode, the servo control circuit 6 sets the rotation speed of the spindle motor 2 and the focus of the optical head 3 optimally by the spindle servo unit 4 and the focus / tracking servo unit 5, and the optical head 3 The position is set to the recording start position of the optical disc 1.
When a recording signal is input via the input analog system circuit 13, recording to the CD-ROM audio is performed by the encoder 2
5A performs compression processing by orthogonal transformation as shown in FIG. 11, or encoder 25B performs compression processing by orthogonal transformation / Huffman code as shown in FIG. 10, and the audio data after the compression processing is performed by the encoder 21 in the CD-ROM mode. In the interleave format corresponding to the two standards, the CD-DA signal processing unit 20 performs CIRC encoding processing on the data, and the encoded signal is recorded by the encoder 1 for recording.
0 to record on the optical disc 1 in the CD-ROM audio format. Further, based on the address information obtained from the pre-formatted portion or the pre-grouped portion of the optical disc 1, information regarding the recording start / end position and the address / time is recorded in the inner area of the optical disc 1 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 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 focus is set as in the recording mode. While the control is executed, the optical head 3 is moved to the inner area of the optical disc 1 and the TOC information of the area is read (steps S1 and 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, but the CD-DA of the signal processing circuit 11 is input.
The TOC information subjected to the CIRC decoding process in the signal processing unit 20 is saved in the CPU 17 via the CPU 14.

By reading the control bit (4 bits) of the TOC in step S2, it can be determined whether or not it is a CD-ROM. However, since there is no TOC in the CD-ROM according to the standard, some discs cannot read the control bits. Therefore, a step S2A for determining whether or not the TOC can be read is provided, and if the TOC cannot be read, the disc unplayable display is not immediately performed.
The PVD (Primary Volume Descriptor) of the first track is read (step S7). The PVD is a part where information such as a title name and an author name is described as shown in FIG. By the way, the TOC information includes table of contents information such as numbers and addresses / time information of programs (musical pieces and images) recorded on the optical disc 1, but its Q channel is shown in FIG. The frame structure is as shown, and the control bits (4 bits) and the address bits (4 bits) are added prior to the data bits (72 bits) representing the above information. And the control bit Q
1 to Q4 indicate that when Q2 is "0", it is an audio disc, and when Q2 is "1", it is a data disc. CD-DA is naturally an audio disc. Yes, CD-ROM and CD-ROM audio are treated as data discs. So C
PU17 saves control bits Q1 to Q4
The type of the optical disc 1 is determined from the contents of the (step S
3). That is, the CPU 14 functions as a determination unit.

Now, the control bits Q1 to Q4 are "0".
When Q2 is "0" in any of 00000 "/" 1000 "/" 0001 "/" 1001 ", the CPU 17 immediately turns on the CD-DA flag and detects that the flag is set. Connects the switch circuit 24 of the signal processing circuit 11 to the b side and the switch circuit 28 to the d side (steps S3 → S4, S5), that is, is loaded based on the fact that Q2 is “0”. It is determined that the optical disc 1 is a CD-DA, and a reproduction system CD
-ROM (XA format) decoder 22A and CD
The ROM (mode 2) decoder 22B, the orthogonal transformation decoder 26A which is the decompression decoder means, and the orthogonal transformation / Huffman code decoder (subordinate circuit of the orthogonal transformation decoder and the Huffman code decoder) 26B are respectively set to the through-pass mode to set the CD-DA signal. Only the processing unit 20 is set to the operation mode.

The servo control circuit 6 moves the optical head 3 to the first track of the optical disc 1 by the focus / tracking servo section 5, and thereafter, while executing the spindle tracking control by the servo control circuit 6, the data of the first and subsequent tracks is recorded. Is read out and reproduced (step S6).
Specifically, the signal read from the optical disc 1 is RF.
The signal is amplified by the amplifier 7, EFM-demodulated by the reproduction decoder 8, and input to the signal processing circuit 11. In the signal processing circuit 11, the CD-DA signal processing unit 20 performs CIRC decoding processing and the like, and is configured by the switch circuits 24 and 28. The signal is output to the output analog system circuit 12 via the through-pass circuit, and D / A converted by the output analog system circuit 12 to obtain an audio reproduction signal.

Next, the control bits Q1 to Q4 are set to "
If Q2 is "1" at 0100 ", the CPU 17
Is the loaded optical disk 1 is a CD-ROM or CD
-Assuming ROM audio, servo control circuit 6
The optical head 3 is moved to the first track of the optical disc 1 to read the track, and the PVD code included in the first track is confirmed (step S3 →
Steps S7 and S8). In this case, although it may be confirmed from the EFM demodulated data of the reproduction decoder 8, in the present embodiment, the CIR is performed by the CD-DA signal processing unit 20 of the signal processing circuit 11.
The CPU 14 detects the C-decoded PVD code.

By the way, the optical disk 1 is included in the PVD.
Is the CD-ROM, the CD-ROM code is CD-
In the case of ROM audio, an audio-only code is recorded, and the CPU 14 determines that the loaded optical disk 1 is a CD-ROM or a CD-R based on the detected code.
It can be confirmed whether the CD-ROM is in the OM mode 2 or not. Here, if the detection code is an audio-only code, the CPU 14 causes the signal processing circuit 11 to
Output a switch control signal to the switch circuit 24 a2
CD-ROM (mode 2) decoder 22 by connecting to the side
B is set to the decode mode (S7, S8 → S9). That is, the CPU 14 functions as a confirmation means, and it is assumed that the optical disc 1 loaded by the detection of the audio dedicated code is a CD-ROM audio.
Since this CD is recorded in the CD-ROM mode 2 format (see the fourth row in FIG. 18) as described above, C
Decoding by the D-ROM (mode 2) decoder 22B is required. At this stage, the switch circuit 28 is not controlled and is kept in the floating state.

After the switching of the switch circuit 24 to the a2 side is completed, in step S17, compression is performed when the sector is recorded from the lower 2 bits of the coding information in the subheader in the read information of the sector currently accessed. Detect the type of method (Type 1, Type 2). Here, the type 1 is a compression method of data written in the sector when the CD-ROM audio is manufactured.
In the meantime, the type 2 means that the orthogonal transform and the Huffman coding are adopted as shown in FIG.

Next, in step S18, the CD-ROM audio flag is turned on, a control signal is output to the signal processing circuit 11 in step S19, and the switch circuit 28 is switched to the c side or the j side depending on the type detected in step S17. Switch to. Next, the audio data of the second and subsequent tracks is reproduced (step S20). That is, the CPU 14 functions as a mode setting unit, and in the signal processing circuit 11, C
The data that has been CIRC decoded by the D-DA signal processing unit 20 is transferred to the orthogonal transform decoder 26A or the orthogonal transform / Huffman code decoder 26B via the CD-ROM (mode 2) decoder 22B, and the decoded data is output here. It is supplied to the analog circuit 12.

Although the orthogonal transform decoder 26A and the orthogonal transform / Huffman code decoder 26B are shown as separate units in FIG. 1, a part of the circuit can be shared by configuring them as shown in FIG. That is, FIG. 13 shows the orthogonal transform decoder 43 and the cascade connection circuit of the Huffman code decoder 42, which are configured to output from the output terminal of the orthogonal transform decoder 43 and the output terminal of the Huffman code decoder 42, respectively. The signals are respectively connected to terminals j and c of switch circuit 28. That is, when the terminal j is selected, the decoder circuit operates as the orthogonal transform decoder 43, and when the terminal c is selected, it operates as the cascade connection circuit of the orthogonal transform decoder 43 and the Huffman code decoder 42.

In the reference example 1 of FIG. 1, the orthogonal transform decoder 26 is used.
Although A and the orthogonal transformation / Huffman code decoder 26B, or the circuit of FIG. 13 as a modification thereof are used as the decompression decoder means, the Huffman code decoder and the orthogonal transformation / Huffman code decoder 26B may be used as another mode. it can. FIG. 14 is a block diagram showing another configuration example of the orthogonal transform / Huffman code decoder, in which the cascade connection circuit of the orthogonal transform decoder 43 and the Huffman code decoder 42 and another Huffman code decoder 44 connected to the input terminal are shown. Shows. The output terminals of the two Huffman code decoders 42 and 44 are respectively output, and these output signals are connected to the terminals j and c of the switch circuit 28, respectively. That is, when the terminal j is selected, the decoder of FIG. 14 operates as the Huffman code decoder 44, and when the terminal c is selected, the orthogonal transform decoder 43 and the Huffman code decoder 42 are selected.
Operates as a cascade connection circuit.

As another mode, a Huffman code decoder may be used in addition to the orthogonal transform decoder 26A and the orthogonal transform / Huffman code decoder 26B, and these three decoders can be switched and used alternatively. That is, as shown in FIG. 15, three modes are provided by using a circuit that combines FIG. 13 and FIG.
Type 1 is an orthogonal transform, type 2 is an orthogonal transform + Huffman code, and type 3 is a Huffman code.
One of them can be selected by a switch circuit (not shown).

Returning to FIG. 2, in step S8, the PVD code is not the audio-only code but CD-.
If the code is a ROM (XA) code, the CPU 14 outputs a switch control signal to the signal processing circuit 11 to connect the switch circuit 24 to the a1 side in the same manner, and the CD-ROM.
(XA format) The decoder 22A is set to the decode mode (S8, S11, S12). At this stage, the switch circuit 28 is not controlled and is kept in the floating state as it is. Next, the CPU 14 turns on the CD-ROM flag and gives a switch control signal to the signal processing circuit 11 to connect the switch circuit 28 to the d side, and the orthogonal transform decoder 26A and the orthogonal transform / Huffman code decoder 2 are connected.
6B is set to the through-pass mode (steps S13 and S1)
4).

When the switch circuit 28 is connected to the d side through the above procedure, it becomes possible to output the decoded data from the CD-ROM (XA format) decoder 22A from the signal processing circuit 11 to the output analog system circuit 12. Become 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 reproduces the data on the first and subsequent tracks (step S15). In that case, in the signal processing circuit 11, the CD-DA signal processing unit 20 performs CI
The RC-decoded data is decoded by the CD-ROM (XA format) decoder 22A and output to the analog circuit 12
Supply to.

In step S3, the CD-ROM or C
Even if it is determined to be D-ROM audio, step S
8 → In S14, audio-only code is also CD-RO
If no M code is detected, it is estimated that a disc of another variation that cannot be reproduced by this optical disc device is loaded. So CPU14 chopsticks C
The display data relating to the non-reproducibility is transferred to the display unit 16 via the PU 17 and the display to that effect is executed (step S
19).

As described above, the optical disk apparatus of this embodiment records CD-ROM audio in the CD-ROM mode 2, CD-DA, CD-ROM audio, and CD-R.
It has a configuration that allows shared playback of OM, but it is a CD-D.
It goes without saying that a shared configuration of only A and CD-ROM audio may be used.

Next, referring to FIGS. 16 and 17, reference will be made to the present invention.
Consideration 2 will be described. This second embodiment differs from the first embodiment of FIGS. 1 and 2 in the following points. That is, in the recording system of the first embodiment, the CD-ROM audio is changed to the CD-ROM.
In contrast to the configuration that records only in mode 2,
In the embodiment, in addition to the CD-ROM mode 2, a CD-ROM
(XA format) can be recorded, and an MPEG encoder as a compression encoder can be switched and used. In the reproducing system of the first embodiment, CD-DA, CD-ROM audio, CD-ROM
The second embodiment is a CD-D.
A, CD-ROM audio, and VCD can be used in common.

Here, considering VCD, VC
D is compatible with the existing CD-I FMV, and the data of the entire disc is as shown in FIG.
A) Format Complies with Form 1, and file management is performed according to ISO9660 format. FIG. 5 is a diagram showing a track configuration in the VCD standard, and FIG. 6 is a sector format diagram of a video sector in the VCD standard. 7 is a sector format diagram of an audio sector in the VCD standard, and FIG. 8 is a diagram of interleaved recording of an audio sector and a video sector in the VCD standard.

In the reference example 2 , there are the following changes in the configuration of the signal processing circuit 11 so that the CD-DA, the CD-ROM audio and the VCD can be used in common. In the first embodiment, the switch circuit 28 switches between one of the two decoding modes and the through-pass mode according to the compression method of the CD-ROM audio, but the MPEG which responds to the output of the switch circuit 24 is further provided.
A decoder 29 is provided so that the output signal of the MPEG decoder 29 is selected when the switch circuit 28A is connected to the j side. It should be noted that when recording a VCD, MPE for compressing the video signal from the input terminal VIDEO IN
A G encoder 30 is provided and switched by the switch circuit 27A. The CPU 14 controls each switch circuit and the like according to a program prepared in advance to perform such an operation. As a CD-ROM audio data compression method, an orthogonal transformation / Huffman code encoder 25 is used.
It is configured to select either B or the Huffman code encoder 25C, and an orthogonal transform / Huffman code decoder 26B and a Huffman code decoder 26C are provided accordingly. Further, in addition to the CD-ROM (mode 2) encoder 21, a CD-ROM (XA format) encoder 21A and through-path circuits for these are provided, and a switch circuit 23 is used for switching.

Reference example 2 according to the flowchart of FIG.
2 will be described, but only steps different from those in the flowchart of FIG. 2 will be described. In step S19 of FIG. 2, the terminal c side or j side of the switch circuit 28 is selected according to the mode, but in corresponding step S19A of FIG. 17, the terminal c1 side or c2 side of the switch circuit 28A is selected according to the mode. It Therefore, when reproducing the CD-ROM audio, the orthogonal transform / Huffman code decoder 26
Either B or the Huffman code decoder 26C is selected (step S20A).

Further, instead of step S11 of FIG. 2, in step S11A, it is determined whether or not the VCD code exists. That is, the CPU 14 functions as a means for confirming the existence of the VCD code. Further, after step S12, the preliminary regeneration mode is set in step S39, and step S4
At 0, the second track is played. MP in step S41
The result of MPEG decoding by the EG decoder 29 is checked. If the decoded data is not normal in step S42,
In step S16, it is displayed that reproduction is impossible. If the decrypted data is normal, the VCD flag is turned on in step S23A.
Then, in step S24A, the switch circuit 28A is controlled to be connected to the j side. As a result, in step S15A, V
The reproduction of the CD is performed in the main reproduction mode. That is,
The CPU 14 functions as a normal decoded data detecting means and a mode shifting means.

In the second reference example , the orthogonal transform / Huffman code decoder 2 is used to reproduce the CD-ROM audio.
6B and the Huffman code decoder 26C are used by switching, but the reference example 1 , the orthogonal transform decoder 26A and the orthogonal transform / Huffman code decoder 26B may be switched, and the orthogonal transform decoder 26A and the orthogonal transform / decoder 26A may be used.
Huffman code decoder 26B and Huffman code decoder 2
One of the three 6C decoders may be selected. Furthermore, when a linear PCM signal that is not compressed is recorded on the CD-ROM, it is not necessary to perform decoding for expansion during reproduction. Therefore, it confirmed the presence of audio-only code, and when the presence of CD-ROM code has been confirmed, set the extension decoder means through-pass mode so as to a non-conversion at the time of reproduction, Reference Example 1
Alternatively , the switch circuit 28 in 2 (including the switch circuit 28A in the following embodiments) can be controlled to be switched to the terminal d side.

In each of the above reference examples , the switch circuit 28 or 28A is provided on the output side of the orthogonal transform / Huffman decoder 26B or the like, but depending on the configuration of the decoder,
It can be provided on the input side or the internal connection of the decoder itself can be switched.
It is also possible to exclude duplicate circuits from the configurations of FIGS. In each of the above reference examples , the output analog system circuit 12
If a means for switching the sampling frequency fs is provided in the input analog system circuit 13 so that one of 44.1 kHz and 88.2 kHz can be selected, a desired fs can be selected and reproduced in the recording embodiment. Sometimes, it can be adjusted to the fs at the time of recording on the optical disc 1.

Since each of the above-mentioned reference examples is an optical disk device capable of recording / reproducing, the optical disk 1 is a phase change disk, but naturally it may be an optical disk only for reproduction.
Further, in a magneto-optical disk, CD-DA, CD-ROM audio, CD
-The shared reproduction of the ROM can be performed.

Next, shared reproduction of CD-DA and DVD audio (specific digital disk audio) and DVD (specific digital disk) can be performed , and the present invention is realized.
A first embodiment and a second embodiment of an applied optical disk device will be described. FIG. 19 is a data arrangement schematic diagram showing a DVD format in sector units. As shown in FIG. 19, in a DVD, one pack is usually composed of 2048 bytes (one logical sector), and 2034 bytes of a packet (user data) in it can be used. In FIG. 19, “pack start” has a SYNC pattern that is a synchronization signal, “SCR” is a system clock reference that is time information, “Muxrate” is a transfer rate (multiple rates), and “packet” “(User data)” includes a packet header and data.

[0055] The first embodiment has been described so far ginseng
It can be configured by adding the following changes to the first example. That is, as shown in FIG. 20, a CD-ROM (mode 2) encoder 21 and a CD-ROM (XA FORMAT) decoder 22A of the signal processing circuit 11 of FIG.
DVD encoder (packing encoder)
21B and DVD decoder (unpacking decoder) 2
It may be replaced with 2C. The CD-ROM (mode 2) decoder 22B shown in FIG.
The terminal a2 of 4 is also unnecessary. Further, as shown in FIG. 21, the “CD-ROM code” in step S11 in FIG. 2 is replaced with “DVD code” (step S11B), and the “CD-ROM flag” in step S13 is replaced. The “DVD flag” is set (step S12A), and the “CD-ROM audio flag” in step S18 is set to “D
VD audio flag "(step S18A),
As a result, steps S15B and S20B of FIG. 21 are also changed. In addition, the "CD-ROM encoding circuit 3 of FIG.
4 "is a" DVD encoding circuit ".

According to the first embodiment, when reproducing the DVD audio, the decompression decoding mode corresponding to the compression mode at the time of recording can be automatically set in sector units. Since the first embodiment is shown as a variant of Example 1, the compression encoding mode and decompression decoding mode, orthogonal transform and orthogonal transform and Huffman codes but two, orthogonal transformation as in the second embodiment Two Huffman codes and Huffman codes may be used, or these three modes may be combined and selected in sector units. During reproduction, by selecting the through-pass mode (terminal d of the switch circuit 28) of the decompression decoding device,
A non-converted output can be obtained when the audio is recorded without being compressed by the linear PCM.

Next, in addition to the above-mentioned first embodiment, the MP of the DVD is
A second embodiment capable of recording and reproducing image data by EG compression will be described with reference to FIGS. 22 and 23. The second embodiment can be constructed by making the following changes to the second reference example . That is, FIG.
CD-ROM of the signal processing circuit 11 of FIG.
(XA FORMAT) Encoder 21A and CD-R
The OM (XA FORMAT) decoder 22A is connected to a DVD encoder (packing encoder) 21B and D, respectively.
It may be replaced with a VD decoder (unpacking decoder) 22C. The CD-ROM of FIG. 16 (mode 2)
Encoder 21 and CD-ROM (mode 2) decoder 2
2B is unnecessary, and the terminal f2 of the switch circuit 23 and the terminal a2 of the switch circuit 24 are also unnecessary. As shown in FIG. 23, “MPEG code” (step S11B) is used instead of “VCD code” in step S11A of FIG.
"VCD flag" in step S23A
Instead of "MPEG flag" (step S23
B), the "CD-ROM audio flag" of step S18 is set to the "DVD audio flag" (step S
18A), and as a result, steps S15B and S2 of FIG.
0B has also been changed. The "CD-ROM encoding circuit 34" in FIG. 9 is referred to as a "DVD encoding circuit". With such changes, the DVD plates of Reference Examples 1 and 2 can be obtained. Further, in consideration of the difference in the thickness of the layers forming the disc between the CD-DA and the DVD, a bifocal type or a 2-lens switching type optical head for performing focus servo control and tracking servo control is used.
Alternatively, it goes without saying that it is necessary to take measures required for a dual-purpose machine, such as adaptive switching control of the reproduction decoder and the recording encoder, taking into consideration the difference between the modulation recording method and the modulated reproduction method.

In the above embodiment, the presence of the TOC or the control bit of the TOC is detected to discriminate between the CD-DA and other discs.
For D audio, a disc with a thickness of 0.6 mm is 2
The sheets are stuck together, and when viewed from one side, the thickness is half that of a 1.2 mm thick CD-DA, CD-ROM, CD-ROM audio, or VCD. Due to this difference in physical characteristics, the disc type can be identified by the output characteristics of the optical pickup at the time of focus search. Therefore, the TOC is not always used to identify a DVD or DVD audio and other discs. Existence or TO
It is not necessary to detect the C control bit.

[0059]

As described above, since the present invention is constructed as described above, it has the following effects. I.e. specific
When recording to digital disc audio,
By recording the signal indicating the type of the compression method in sector units, it is possible to select the decoding method in sector units when reproducing the disc. That is, by recording the compression method in sector units, it is possible to change the compression method in fine units and to adopt the decompression decoding method corresponding to the reproduction of the data.

[Brief description of drawings]

1 is a block diagram of a recording / reproducing apparatus including an audio signal compression recording apparatus and an optical disk apparatus is a reference example 1 of the present invention.

2 is a flowchart showing an operation procedure in a reproduction mode of Reference Example 1. FIG.

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

FIG. 4 is a data configuration diagram 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 sector format diagram of a video sector in the VCD standard.

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

FIG. 8 is a diagram of interleaved recording of audio and video sectors in the VCD standard.

FIG. 9 is a block diagram of a recording device according to the applicant's prior application.

FIG. 10 is a block diagram showing an example of a signal processing circuit in the recording apparatus of the above-mentioned prior application.

FIG. 11 is a block diagram showing an example of a signal processing circuit in a recording apparatus of the present applicant's other prior application.

FIG. 12 is a block diagram showing an example of a signal processing circuit in a recording device of yet another prior application of the present applicant.

FIG. 13 is a block diagram showing another example of the configuration of the portion that constitutes the decompression decoder means in FIG. 1.

FIG. 14 is a block diagram showing still another configuration example of a portion which constitutes decompression decoder means in FIG. 1.

FIG. 15 is a block diagram showing still another configuration example of a portion which constitutes decompression decoder means in FIG. 1.

FIG. 16 is a block diagram of a recording / reproducing apparatus including an audio signal compression recording apparatus and an optical disc apparatus according to a second reference example of the present invention.

17 is a flowchart showing an operation procedure in a reproduction mode of Reference Example 2. FIG.

FIG. 18 is a data arrangement schematic diagram showing various formats of a CD in sector units.

FIG. 19 is a schematic data arrangement diagram showing a DVD format in sector units.

FIG. 20 is a block diagram showing a first embodiment of a recording / reproducing apparatus including an audio signal compression recording apparatus and an optical disk apparatus applied to the present invention.

FIG. 21 is a flowchart showing an operation procedure in a reproduction mode of the first embodiment.

FIG. 22 is a block diagram showing a second embodiment of a recording / reproducing apparatus including an audio signal compression recording apparatus and an optical disk apparatus applied to the present invention.

FIG. 23 is a flowchart showing an operation procedure in a reproduction mode of the second embodiment.

[Explanation of symbols]

1 Optical Disc 2 Spindle Motor 3 Optical Head 4 Spindle Servo Unit 5 Focus / Tracking Servo Unit 6 Servo Control Circuit 7 RF Amplifier 8 Reproduction Decoder 9 Laser Drive Unit (Optical Head, Recording Encoder, CD
-Constructs recording means together with DA signal processing section) 10 Recording encoder 11 Signal processing circuit 12 Output analog system circuit 13 Input analog system circuit 14 CPU (type signal generation means, type signal detection means, discrimination means, confirmation means, Mode setting means, CD-RO
Means for confirming existence of M code, means for confirming existence of VCD code, normal decoded data detecting means, mode shifting means) 15 operation unit 16 display unit 17 CPU 20 CD-DA signal processing unit 21 CD-ROM (mode 2) ) Encoder (formatting means) 21A CD-ROM (XA format) encoder 21B DVD encoder 22A CD-ROM (XA format) decoder 22B CD-ROM (mode 2) decoder 22C DVD decoder 23, 24, 27, 27A, 28, 28A Switch Circuit 25A Orthogonal Transform Encoder (Data Compressing Means) 25B Orthogonal Transform / Huffman Code Encoder (Data Compressing Means) 25C Huffman Code Encoder (Data Compressing Means) 26A Orthogonal Transform Decoder (Expansion Decoder Means) 26B Orthogonal Transform / Ha Man code decoder (expansion decoder means) 26C Huffman code decoder (expansion decoder means) 29 MPEG decoder 30 MPEG encoder 31 A / D converter (quantization means) 32 Signal processing circuit (constituting memory 33 and data compression means) 33 Memory 34 CD-ROM Encoding Circuit (Formatting Means) 35 CD Encoding Circuit 36 Filter Bank 37 Switch Circuit (Selecting Means) 38 Huffman Encoding Circuit 39 Allocation Circuit 40 Orthogonal Transformation Circuit 41 Normalization / Quantization Units 42, 44 Huffman Code decoder 43 Orthogonal transform decoder IN input terminals OUT1 and OUT2 output terminals

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 20/10

Claims (2)

(57) [Claims] 1. A DVD audio disc is a special feature.
Audio information including audio data
To an optical disc having an audio sector consisting of
A recording method, wherein a quantization bit number of an audio signal is 20 to 24 bits in a user data area of the audio pack ,
Sampling frequency is quantized at a frequency of 48 kHz or higher, and three compression method modes of orthogonal transform encoding, Huffman code encoding, and both orthogonal transform encoding and Huffman code encoding are performed for each quantized predetermined amount of quantized data. out to compress the data amount by selecting one of the at least two compression methods mode, a type signal indicating the compressed data and compressed methods mode in sectors
Stored in a predetermined sub-header of the user data area.
And formatting as a feature to record this Four Matti <br/> ring data to the optical disk
Recording method for optical disc . 2. The data is recorded by the recording method according to claim 1.
And an optical disk apparatus capable of reproducing information from an optical disc, the one having a DVD decoder, a DVD audio disc from the loaded optical disc
Means for detecting the information for identifying that the optical disk is a DVD audio disc based on the detected information.
When it is specified that the information of the sector is recorded based on the control bit of the sub-header information in the user data area of each sector read from the optical disk. Type signal detection means for detecting a type signal indicating the compression method mode, and at least two of three modes of orthogonal connection decoder, Huffman code decoder, orthogonal conversion decoder, and Huffman decoder cascade connection in response to the output signal of the DVD decoder. Decompression decoder means capable of setting one mode, and a mode for supplying the output signal of the DVD decoder to the decompression decoder means and setting the mode of the decompression decoder means according to the compression method mode detected by the type signal detection means. Setting means and the original decompressed and restored by the set mode
An optical disc device comprising: means for extracting an audio signal .