JP2000099953A - Audio disk, and encoding device, decoding device and copyright management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit the audio data of a PCM system and the audio data of one-bit stream system whose quantity are higher than that of a CD while maintaining the compatibility with the CD, moreover, to manage their copyrights. SOLUTION: 2-channel PCM data A (2 channels), 6-channel PCM data (6 channels) and 6-channel one-bit stream data B (6 channels) are to be recorded on a first pit layer 101a, a second pit layer 102a and a third pit later 102b of a disk respectively. Moreover, first and second CGMCAPS(copy generation management control audio protection system) codes are respectively recorded in respective read-in areas of the second pit later 102a, the third pit layer 102b in order to manage copyrights of the 6-channel PCM data (6 channels) and the 6-channel one-bit stream data B (6-channels).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio disk on which audio data such as a music source is recorded, and an encoding device, a decoding device, and a copyright management method for the audio disk.

[0002]

2. Description of the Related Art Audio optical disks include CDs.
(Compact Disc) has been in the market for over 10 years,
As a recording medium for audio information, it has already remarkably spread beyond conventional cassette tapes. In addition, the physical and logical formats of CDs, which are digital disks, are as follows:
An EFM modulation recording method for 8-bit fixed data length symbols and a data format such as subcode, audio data, and CRC have been established, and a CD player to which various application functions are added has been developed.

An audio signal on a CD has a sampling frequency of 44.1 kHz, a quantization bit number of 16 bits, two channels on the left and right, a reproduction frequency bandwidth of about 22 kHz, and an S / N ratio of about 96 dB. Having. The CD-RO used in the field of electronic publishing
In M, the above characteristics are inferior to CD since audio data is compressed by ADPCM.

On the other hand, for several years, the idea that both the reproduction frequency bandwidth and the S / N ratio described above are unsatisfactory with respect to the reproduction characteristics of a CD has been established, and a next-generation audio disc having more excellent characteristics has been established. Standardization is required. For example, the reproduction frequency bandwidth is 100 kHz, S
A high characteristic of about 144 to 120 dB is required for the / N ratio. As one of the systems satisfying such a demand, a 1-bit stream system (for example,
232755) has attracted attention. In addition, this 1
Bit stream data is also called DSD (Direct Stream Digital) data. According to this 1-bit stream method, when the sampling frequency fs = 200 kHz and the number of quantization bits = 20 bits in PCM conversion, a transmission rate of 4.00 Mbps is required, so that the efficiency is high. Therefore, the 1-bit stream method is PC
It has excellent advantages as compared with the M system and can sufficiently compensate for the dissatisfaction with the characteristics of the CD, so that it is expected to be used in audio equipment and spread in the future.

[0005]

However, most of the conventional digital audio equipment adopts the PCM system, and the data format of most recording media is inevitably the PCM system. There is no switch to audio equipment.

[0006] On the other hand, with the full-scale arrival of the multimedia age, DVD standards have been determined, playback systems conforming to the standards have already been sold, and AV (Audio-Visual) software for DVDs has been supplied. D
It is not difficult to imagine that VD will be very widely spread as a high-density recording medium. Therefore, 1 related to the audio transmission system
By making the bit stream system compatible with the DVD audio standard, excellent playback frequency bandwidth and S
It is considered that the spread of the 1-bit stream system having the / N ratio can be realized at the same time. In particular, if the compatibility with the audio format related to the PCM data in the DVD standard is ensured, the correlation with the transmission system of the conventional PCM system can be ensured, which is convenient.

[0007] In recent years, there has been an increasing trend to respect the copyright of digital audio.
When transmitting higher quality audio data of the PCM system and audio data of the 1-bit stream system or the like, there is a problem of copy protection of high quality audio data.

Accordingly, the present invention provides an audio disk for transmitting PCM audio data and 1-bit stream audio data of higher quality than a CD while maintaining compatibility with a CD, and an encoding device and a decoding device. The first purpose is to do so. Another object of the present invention is to provide a copyright management method capable of solving the problem of copy protection when transmitting PCM audio data and 1-bit stream audio data of higher quality than a CD. This is the purpose of 2.

[0009]

According to a first aspect of the present invention, in order to achieve the first object, an analog audio signal is converted to a CD.
A at the standard 44.1 kHz first sampling frequency
/ D converted first PCM data, second PCM data obtained by A / D converting an analog audio signal at a sampling frequency higher than the first sampling frequency, and 1-bit stream data of the analog audio signal. This is recorded on the first, second and third layers of an audio disc.

That is, according to the first aspect, the first layer in which the first PCM data obtained by A / D converting the analog audio signal at the first sampling frequency of 44.1 kHz of the CD standard is recorded; A second layer on which second PCM data obtained by A / D-converting the analog audio signal at a sampling frequency higher than the first sampling frequency is recorded; and a third layer on which 1-bit stream data of the analog audio signal is recorded. An audio disc having the following layers is provided.

According to the first invention, the analog audio signal is converted into a data structure having the first PCM data, the second PCM data and the 1-bit stream data according to any one of claims 1 to 5. An encoding device having means for formatting is provided.

According to the first invention, one of the first PCM data, the second PCM data and the one bit stream data according to any one of claims 1 to 6 is selectively decoded. A decoding device having means is provided.

According to a second aspect of the present invention, in order to achieve the second object, PCM data and 1-bit stream data are transmitted by transmitting the copyright management data together with PCM data and 1-bit stream data of higher quality than a CD. It is designed to manage the copyright of.

That is, according to the second aspect, the first PCM data obtained by A / D-converting an analog audio signal at a first sampling frequency of 44.1 kHz according to the CD standard and the audio signal are subjected to the first sampling. Second PCM data A / D converted at a second sampling frequency higher than the frequency, first copyright management data for managing the copyright of the second PCM data, and one of the analog audio signals. Bit stream data and the 1
Second for managing copyright of bit stream data
Formatting the data structure into a data structure having the copyright management data, transmitting the data structure through a medium, decoding the data structure transmitted through the medium, and Managing the copyright of the second PCM data based on the right management data, and managing the copyright of the 1-bit stream data based on the second copyright management data. Is provided.

According to the second invention, in order to carry out the above-mentioned management method, the medium is an audio disk, and the sub-data for managing the copyright of the main data is recorded in an area different from the main data area. An audio disc is provided in a form embedded and / or embedded in main data.
The copyright management data is a CGMCAPS code, and the CGMCAPS code is recorded in the CMI area of the disc without being scrambled.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the structure of an embodiment of an audio disk according to the present invention, FIG. 2 is a block diagram showing an embodiment of an audio disk encoding device according to the present invention, and FIG. FIG. 4 is an explanatory diagram showing a format of an information area when the example of (1) is recorded on an audio disc.

FIG. 4 is an explanatory diagram showing a format of a pack in a DVD, FIG. 5 is an explanatory diagram showing a format of a video pack in an audio disk according to the present invention,
6 is an explanatory diagram showing the format of an audio pack in the audio disk according to the present invention, FIG. 7 is an explanatory diagram showing the format of a DSI pack in the audio disk according to the present invention, and FIG. 8 is a VBI pack in the audio disk according to the present invention. FIG. 9 is an explanatory diagram showing the format of the CMI area in the audio disc according to the present invention, FIG. 10 is an explanatory diagram showing the CGMCAPS code of FIG. 9 in detail, and FIG.
10 is an explanatory diagram showing a modification of the CMI area in FIG.

FIG. 12 is a block diagram showing an audio disk reproducing apparatus according to the present invention, FIGS. 13 and 14 are flowcharts showing audio reproducing processing of the reproducing apparatus of FIG. 12, and FIG. 15 is a flowchart of FIG. CGMCA during playback
FIG. 16 is a flowchart showing PS code processing, and FIG. 16 is a flowchart showing CGMCAPS code processing at the time of copying by the audio disk recording / reproducing apparatus according to the present invention.

As shown in FIG. 1, the disc 100 of the present invention has a CD layer 101 and a DVD layer 102 bonded together. Then, a CD is formed on the upper surface of the CD layer 101.
A first pit layer 101a of the standard is formed, a second pit layer 102a of the DVD standard is formed on the lower surface, and a third pit layer 102b of the DVD standard is formed on the upper surface of the DVD layer 102. Then, the disc 100 is manufactured by bonding the CD layer 101 on the second pit layer 102a side and the DVD layer 102 on the third pit layer 102b side.

Here, the following four systems are known as multi-channel systems. (1) Dolby Surround System 3 channels of front L, C and R + 1 channel of rear S in total 4 channels (2) Dolby AC-3 system 4 channels of front L, C, R and SW + rear LS and RS 6 channels in total of 2 channels (3) DTS (Digital Theater System) system 6 channels (L, C,
R, SW, LS, RS) (4) Sony Dynamic Digital Sound (SDDS) system 6 channels of front L, LC, C, RC, R, SW + rear LS, 2 channels of RS, totaling 8 channels

FIG. 2 shows an example of the above (2) Dolby A
Forward L, C, R, S used in C-3 system
4 channels of W + 2 channels of backward LS and RS, total 6
Figure 2 shows an apparatus for encoding a channel. In FIG. 2, signals of 6 channels L, C, R, SW, LS, and RS are respectively low-pass filters (LPF) 1L, 1C,
1R, 1SW, 1LS, 1RS, band-limited, and then analog ΔΣ modulators 2L, 2C, 2R, 2SW,
LS, 2RS.

The analog ΔΣ modulator 2 (2L, 2C, 2
R, 2SW, 2LS, and 2RS) are adders (+)
, An analog integrator (∫), a 1-bit (bit) quantizer (Q), and a 1-bit inverse quantizer (Z ⁻¹ ), and each of the LPFs 1L, 1C, 1R, 1SW, and 1L.
S, each audio signal from the RS is ΔΣ-modulated, converted into 1-bit stream data B (6 ch) having a transmission rate of 9.6 Mbps for each channel, and the data B (6c
h) is converted to a two-channel mixer 310 and a data converter 3-2.
Is transferred to the formatter 4. Here, the 1-bit stream data B (6 ch) is a digital signal, but the spectrum of the input signals L, C, R, SW, LS, and RS exists as it is.

The data converter 3-2 converts each channel of the 1-bit stream data B (6 ch) into PCM data A having a sampling frequency fs of 48 kHz, 96 kHz or 192 kHz and a quantization bit number of 16, 20, or 24 bits. (6ch), this 6 channel P
The CM data A (6 ch) is output to the formatter 4.

The two-channel mixer 310 has one of six channels.
Bit stream data B (6 ch) is divided into two channels
The data is converted into bit stream data B (2ch), and the subsequent data converter 3-1 converts the 1-bit stream data B (2ch).
ch) for each channel, the sampling frequency fs is 44.1.
PCM data A with kHz and 16-bit quantization bit rate
(2ch), and the 2-channel PCM data A (2ch)
ch) to the formatter 4.

The formatter 4 formats the 2-channel PCM data A (2 ch) having a sampling frequency fs of 44.1 kHz and a quantization bit number of 16 bits according to the CD standard, and the modulator 5 performs EFM modulation on the data. The formatter 4 has a sampling frequency fs of 4
8 kHz, 96 kHz or 192 kHz, 16-bit, 20-bit or 24-bit 6-channel PCM data A (6 ch) and 6-channel 1-bit stream data B (6 ch) are formatted into a DVD-standard audio pack, The following modulator 5 converts these to EFM.
Plus modulate.

Here, when manufacturing a single-layer DVD audio disk, data modulated by the modulator 5 is supplied to a DVD cutting machine (player) (not shown), and a master (master) of the DVD audio disk is provided.
Is manufactured. Next, a metal thin film is formed on the master by a sputtering method and a plating method, and is further thickly plated and separated from the master to produce a stamper. Next, a base material of the disc is formed by injection molding by the stamper and bonded to each other to manufacture a DVD audio disc.

On the other hand, when manufacturing the disk of the present invention, two-channel PCM data A (2 ch)
The modulation data of the channel PCM data (6 ch) and the modulation data of the 6-channel 1-bit stream data B (6 ch) are sent to the cutting machine independently, and the first master for the first pit layer 101a and the second pit are respectively provided. A second master for the layer 102a and a third master for the third pit layer 102b are manufactured, and then first to third stampers are manufactured based on the first to third masters, respectively. Then, based on the first and second stampers, the CD shown in FIG.
A first pit layer 101a and a second pit layer 102a are formed on the upper and lower surfaces of the layer 101, and the third pit layer 102a is formed on the upper surface of the DVD layer 102 based on a third stamper.
b is formed. Finally, as shown in FIG.
1 and the DVD layer 102 have a reflectance R of 18% <R <30%
To form a two-layer (substantially three-layer) disk with a semi-reflective layer (SRL).

When recording the 1-bit stream data B on the third pit layer 102b, as shown by the broken lines in FIG. 2, the 1-bit stream data B (6ch) of 6 channels and the 1-bit stream data of 2 channels are recorded. B
(2ch) may be recorded. FIG. 3 shows the format of the third pit layer 102b in this case,
This information area has a lead-in area, a data area, and a lead-out area from the inner circumference to the outer circumference. The data area has a file system area, a master TOC area, a two-channel stereo area, a multi-channel area, and an extra data area. 2
For details on the channel stereo area, refer to the area TOC1.
And a plurality of two-channel stereo audio tracks and an area TOC2, and the multi-channel area has an area TOC1 and a plurality of multi-channel audio tracks and an area TOC2.

In the two-channel stereo area, the above-mentioned two-channel 1-bit stream data B (2 ch)
Are arranged, and 1 of 6 channels is arranged in the multi-channel area.
Bit stream data B (6 ch) is arranged. As will be described later, 1-bit stream data B (6 ch), B
Second copyright management data (CGMCAPS code) for independently managing the copyright of (2ch) is arranged.

Here, an audio (A) pack, a video (V) pack, a sub-picture (SP) pack, a DSI pack, and a VBI pack in the basic format of the DVD are each a 2034-byte A packet, as shown in FIG. V packet, SP packet, DSI packet,
For a VBI packet, 4-byte pack start information, 6-byte SCR (System Clock Reference: system clock reference value) information, and 3-byte Mux rate (r
ate) Information and 1-byte stuffing length (long)
(1 pack = 2048 bytes in total). In this case, the time of the A pack in the same album can be managed by setting the SCR information, which is the time stamp, to be “1” in the first pack in the ACB unit and to be continuous in the same album.

On the other hand, in the packing method of the present invention, the A-pack is composed of a 14-byte pack header and an audio packet (PCM, 1 bit) instead, as shown in FIG. 29 byte packet header, 1 byte substream I
D, 3 bytes of audio frame information, 3 bytes of audio data information (ADI), and 2013 bytes of audio data (PCM). And
In the ADI field, identification data indicating whether or not it includes 1-bit stream data is described.

Further, as shown in FIG.
The video packet includes a pack header of 9 bytes and a video packet, and the video packet includes a packet header of 9 to 29 bytes and video data of 2025 bytes or less. Further, the DSI pack is composed of a 14-byte pack header and a DSI packet as shown in FIG.
The DSI packet has a 24-byte system header, a 6-byte packet header, and a 1-byte substream I.
D and 2003 bytes of DSI data.
As shown in FIG. 8, the VBI pack is composed of a 14-byte pack header and a VBI packet.
The packet has a packet header of 9 to 29 bytes, a substream ID of 1 byte, and a VBI of 2019 bytes or less.
It is composed of data.

Each lead-in portion of the second pit layer 102a and the third pit layer 102b has 16 bytes (128 bytes).
Bit) to 188 bytes (1504 bits) of variable length copyright management information (CMI) area. In the CMI area, as shown in FIG. 9, for example, 64-bit disc manufacturing date data, a 52-bit factory code, an 8-bit scrambling synchronization signal, and a 60-bit ISRC code (International Stanch Code)
dard Recording Code), an 8-byte SID (source ID) code, and a 4-bit first CGMCAPS (Copy Generation Management Cond
A 4-bit second CGMCAPS code is recorded in the same manner as the trol audio protection system code. This data is repeatedly recorded several times, and the ISRC code and the SID code are scrambled and recorded.

The first and second CGMCAPS codes store the control data area of the lead-in section in RA
It is manufactured and recorded as an M area. And the first
The CGMCAPS code is a copy guard management code for PCM data material, and the same data is recorded in the lower 4 bits. Also, the second CGMC
The APS code is a copy guard management code of a 1-bit stream data material (content), and the same data is recorded in the lower 4 bits.

Then, as shown in FIG. 10, of the 4-bit data, 2 bits or 3 bits correspond to the actual CGM.
CAPS information is used, and the remaining one or two bits are used as blanks. This data also
It is used as reproduction permission / prohibition information for a reproduction-only device (and a recording / reproduction device for reproduction), and is used as copy permission / prohibition information for a recording / reproduction device for copying. The contents of the CGMCAPS information shown in FIG.
This will be described in detail with reference to the flowcharts shown in FIGS.

When a plurality of music pieces are separately managed for copy management in a disc, a CGMCAPS code is provided for each of them. It should be noted that each of the first and second CGMCAPS codes is formed by 4 bits (actual data is 2 or 3 bits) as shown in FIG.
It may be recorded in the byte area. Also, the second pit layer 1
The first CGMCAPS code may be recorded in the lead-in portion of 02a, and the second CGMCAPS code may be recorded in the lead-in portion of the third pit layer 102b. Furthermore, instead of providing it in the CMI area on the inner circumference of the disc, CGMCA
I having a memory storing a PS code and the like and a CPU
C is embedded in a disc, and a read-only device or a recording / reproducing device sends a read control signal to this IC, and CGMCA
A PS code or the like may be read.

FIG. 12 shows an apparatus for reproducing a signal recorded on a disk 10 such as a DVD audio disk or a DVD video disk according to the present invention. The drive device 11 is a CD layer 101 of the disk 100 of FIG.
A bifocal pickup is used to selectively read (first pit layer 101a) or DVD layer 102 (second pit layer 102a, third pit layer 102b). This 2
As shown in FIG. 1, the focus pickup reads at a reflectance R of R> 70% and a wavelength of 780 nm with respect to the CD layer 101 and at a reflectance R of 18% <with respect to the DVD layer 102.
Read at R <30%, wavelength = 635 nm. And C
The two-channel PCM data read from the D layer 101 is subjected to EFM demodulation, and then output via the CD decoder 300 and the D / A converters 44 and 45 for two channels, while being read from the DVD layer 102. The signal is EFMplus
Demodulated.

More specifically, the disk drive device 11 is controlled by a drive control circuit 12, and the disk 10 is driven by the drive device 11 to read a recording signal. This signal is subjected to EFM demodulation and EFMplus demodulation by the demodulation circuit / error correction circuit 13 and then error correction. Then, the stream signal excluding the control data is written to the track buffer 14 by the write control circuit 15,
Further, the control data is written into the system buffer 17.

The system controller 32 controls the reproduction based on the control data written in the system buffer 17. The system controller 32 includes an operation unit 30, a display unit 31, a readable / writable system parameter memory 33, a reproduction-only system parameter memory 34, and a readable / writable general-purpose parameter memory 35 for performing reproduction control. And a system timer 36 are connected.

The stream signal written to the track buffer 14 is read by the read control circuit 16 and then demultiplexed by the demultiplexer 23 into a VBV pack, a sub-picture pack, a VBI pack, an audio pack, and a DS.
Each pack is separated into a VBV buffer 18, a sub-picture buffer 19, and a VBI buffer 2.
0, audio buffer 21 and DSI buffer 22. Then, the VBV pack is stored in the video decoder 28.
And then the letterbox converter 26
Is sent to the adder 27 via. The sub-picture pack and the VBI pack correspond to the sub-picture decoder 2 respectively.
4. The adder 2 is decoded by the VBI decoder 25 and
7, and the adder 27 combines these video signals. The audio pack is sent to the audio decoder 29.

In the audio decoder 29, first, the audio pack is decomposed into PCM data A and 1-bit stream data B by the format decomposer 41. P
The CM data A is separated into, for example, six channels of PCM data A (6 ch) by the channel separator 42, and the PCM data A (6 ch) of each channel is divided into six D / Ds corresponding to the number of channels.
The signals are converted into analog signals by the A converters 44 and 45 and output. The 1-bit stream data B is separated into, for example, 6-channel 1-bit stream data B (6 ch) by the channel separator 43, and the data B (6 ch) of each channel is output via LPFs 46 and 47 for the number of channels. You.

Next, the reproduction process will be described with reference to FIG. 10 and FIGS. First, in FIG.
When the instruction for the CM reproduction mode is input, the system controller 32 sets the PCM reproduction mode in the format decomposer 41, and displays the mode on the display unit 31 (steps S1 → S2). On the other hand, when the 1-bit stream mode instruction is input in step S3, the system controller 32 executes “copy protection management” based on the CGMCAPS code as shown in detail in FIGS. Set the stream mode to the format decomposer 41, and
The mode is displayed on the display unit 31 (step S
4). Then, when the reproduction mode is corrected, step S5
Then, the process returns to step S1.

In FIG. 14, when a disc playback instruction is issued from the operation unit 30, reading of the disc is started, and the first packet is transferred to the audio buffer 21.
When the ADI is detected, the format decomposer 41 determines whether or not there is disc identification data in the ADI (steps S11 and S12). Here, if there is disc identification data, the disc is the disc according to the present invention, and the process proceeds to step S13 and thereafter. On the other hand, if there is no disc, the DVD or this reproducing apparatus is a non-reproducible disc. That effect is displayed on the display unit 31.

In step S13, it is determined whether or not there is discrimination data. If there is no discrimination data, "copy protection management" is executed based on the CGMCAPS code, as shown in detail in FIGS. If there is, the process proceeds to step S18 and subsequent steps. In step S18, it is determined whether or not the set reproduction mode is the PCM mode. If the set reproduction mode is the PCM mode, the process proceeds to step S19 and thereafter, and if not, the "copy protection management" is executed.

When the execution of the "copy protection management" process is completed, in step S14, the set reproduction mode is set to PCM.
It is determined whether the mode is the mode or not. If the mode is the PCM mode, the process proceeds to step S15 and the other steps. Step S15, S17
Sets the second PCM mode for the format decomposer 41, thereby setting the second pit layer 1 of the DVD layer 102.
The second PCM signal (data) in 02a is decoded and output.

In steps S19 and S21, the first PCM mode (44.1) is sent to the format decomposer 41.
kHz mode), thereby setting the sampling frequency fs = in the first pit layer 101a of the CD layer 101.
The 44.1 kHz first PCM signal is decoded and output. Also, in steps S22 and S24, the 1-bit stream mode is set for the format decomposer 41, and thereby the third pit layer 102b of the DVD layer 102
1 bit stream data of 9.6 Mbps is decoded and output.

FIG. 15 shows CGMCAPS code processing at the time of reproduction without copying the reproduction signal to another medium. 10 and 15, first, information of the lead-in area is read (step S30), and then it is determined whether the disk is a ROM disk or a RAM disk (steps S31, S32). Then, in the case of a ROM disk, the CGMCAPS code is determined. If (1, 1), reproduction is prohibited (step S3).
(3, S34), When (1, 0), reproduction is prohibited (step S3).
5, (S36), • When (1, 0, 1), reproduction is prohibited (step S36).
37, S38), when (0, 0), reproduction is permitted (step S3)
9. If no CGMCAPS code is detected, reproduction is permitted (steps S41 and S42).

In the case of a RAM disk, the CGMCAPS code is also determined. If it is (1, 1), reproduction is prohibited (step S4).
(3, S44), When (1, 0), reproduction is prohibited (step S4).
5, (S46), When (1, 0, 1), reproduction is permitted (step S46).
47, S48), When (0, 0), reproduction is permitted (step S4).
9. If no CGMCAPS code is detected, reproduction is permitted (steps S51 and S52).

Next, the processing at the time of copying will be described with reference to FIGS. First, information of the lead-in area is read (step S60), and then CGMCAP
Judgment of S code. If (1, 1), copy is prohibited (step S6)
(1, S62), ・ (1,0), CGMCA of copy source disk
Copying is permitted by rewriting the PS code to (1, 0, 1) (steps S63, S64). When (1, 0, 1), copying is prohibited (steps S65, S66). ), Copying is permitted (step S6).
7, S68), If the CGMCAPS code is not detected, copying is permitted (steps S69, S70). Therefore, C
Discs whose GMCAPS code is (1, 0) to (1, 0, 1) are prohibited from being reproduced as shown in FIGS. A disc with a CGMCAPS code of (1, 1) cannot be played by a commercially available player, and is intended for a specific application that can be played only by a specific player.

In the above embodiment, the CGMCAPS code is taken as an example of the copyright management data.
CGMS (Copy Generation Management)
System) code may be used. This CGMS code is composed of 3 bits, the first bit indicates whether copying is prohibited, the second bit indicates whether copying is permitted once, and the third bit indicates whether copying is prohibited again. Then, as the CGMS code, the copy-protected original D
(1, ×, ×) is recorded on the VD, (0,1,0) is recorded on the original DVD permitted for one-time copying, (0,1,1) is recorded on the valid copy DVD, (0, 0, x) is recorded on a DVD without copyright.

The CGMS code or CGMCAP
The S code may be embedded in the audio data and recorded instead of being recorded in an area different from the audio data, or may be recorded in both. FIG. 18 shows a main part of an encoding device when a CGMS code is embedded in audio data, and FIG. 19 shows a CGMS code detecting unit of a decoding device. FIG.
In this case, even if the CGMS code is embedded in the audio data, the 256-band spectrum of the audio data of each channel is detected by the signal analysis unit 201 so that the audible sensation cannot be recognized during reproduction, and the embedding level is determined adaptively. Further, the CGMS code is spread by the spread spectrum unit 202 using the PN code. Then, the level of the CGMS code subjected to the spectrum spreading is adaptively controlled by the spectrum shaping section 203 according to the embedding level, and then added to the audio data by the adding section 204.

In the CGMS code detector shown in FIG.
The audio data in which the CGMS code is embedded is applied to the spectrum / deshape section 211 to return to the original spectrum before embedding, and then downsampled by the sampling frequency (f) conversion section 212 and applied to the multiplier 213. . The multiplier 213 also has
A PN signal generated based on a special secret CGMS key for making the PN signal generation unit 214 difficult to decode is applied.
The code is demodulated. Then, the CGMS detection unit 214 detects a CGMS code based on the output of the multiplier 213.

[0053]

According to the first aspect of the present invention, as described above, the analog audio signal has a CD standard of 44.1 kHz.
A / D converted first at the first sampling frequency of z
PCM data and an analog audio signal
A at a sampling frequency higher than the sampling frequency of
Since the second PCM data subjected to the / D conversion and the 1-bit stream data of the analog audio signal are recorded on the first, second, and third layers of the audio disc, respectively, the PCM system of higher quality than the CD Audio data and 1-bit stream audio data can be transmitted. According to the second invention, the copyright of the PCM data and the 1-bit stream data is managed by transmitting the copyright management data together with the high-quality PCM data and the 1-bit stream data. When transmitting high-quality PCM audio data and 1-bit stream audio data, the problem of copy protection can be solved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the structure of an embodiment of an audio disc according to the present invention.

FIG. 2 is a block diagram showing an embodiment of an audio disk encoding device according to the present invention.

FIG. 3 is an explanatory diagram showing a format of an information area when another example of 1-bit stream data is recorded on an audio disc.

FIG. 4 is an explanatory diagram showing a format of a pack in a DVD.

FIG. 5 is an explanatory diagram showing a format of a video pack on an audio disc according to the present invention.

FIG. 6 is an explanatory diagram showing a format of an audio pack in the audio disc according to the present invention.

FIG. 7 shows a DS in an audio disc according to the present invention.
FIG. 3 is an explanatory diagram showing a format of an I-pack.

FIG. 8 shows a VB in an audio disc according to the present invention.
FIG. 3 is an explanatory diagram showing a format of an I-pack.

FIG. 9 shows a CM in an audio disc according to the present invention.
FIG. 3 is an explanatory diagram showing a format of an I area.

FIG. 10 is an explanatory diagram showing the CGMCAPS code of FIG. 9 in detail.

FIG. 11 is an explanatory diagram showing a modification of the CMI area in FIG. 9;

FIG. 12 is a block diagram showing an audio disc reproducing apparatus according to the present invention.

FIG. 13 is a flowchart showing audio playback processing of the playback device of FIG. 12;

FIG. 14 is a flowchart showing audio playback processing of the playback device of FIG. 12;

FIG. 15 is a flowchart showing CGMCAPS code processing at the time of reproduction in FIGS. 13 and 14;

FIG. 16 is a flowchart showing CGMCAPS code processing at the time of copying by the audio disk recording / playback apparatus according to the present invention.

FIG. 17 is an explanatory diagram showing a CGMS code as another example of the copyright management data.

FIG. 18 is a block diagram illustrating a main part of an encoding device when a CGMS code is embedded.

FIG. 19 is a block diagram illustrating a CGMS code detection unit of the decoding device.

[Description of Signs] 1 LPF 2 analog ΔΣ modulator 3-1, 3-2 data converter 4 formatter (formatting means) 29 audio decoder (decoding means) 100 audio disk 101a first pit layer (first layer) ) 102a second pit layer (second layer) 102b third pit layer (third layer) 310 two-channel mixer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B049 AA05 BB26 DD03 DD05 FF03 FF04 FF09 5D029 JB13 WD08 WD21 5D044 AB06 BC04 CC04 DE03 EF01 GK17 GL18 HL08 JJ02 5D090 AA01 BB02 BB12 CC04 CC16 GG32 DD03 DD05

Claims (8)

[Claims] An analog audio signal conforms to the CD standard.
A first layer on which first PCM data A / D converted at a first sampling frequency of 4.1 kHz is recorded; and an A / D conversion of an analog audio signal at a sampling frequency higher than the first sampling frequency. The second
An audio disc, comprising: a second layer on which PCM data is recorded; and a third layer on which 1-bit stream data of an analog audio signal is recorded. 2. The second layer further includes a second PC.
2. The audio disc according to claim 1, wherein data for managing the copyright of the M data is recorded in an area different from the data area and / or embedded in the data and recorded. 3. The third layer further includes data for managing copyright of the 1-bit stream data recorded in an area different from a data area or / and embedded in the data. 3. The audio disc according to claim 1, wherein 4. The copyright management data is CGMCAPS.
Code or CGMS code, wherein the CGMCAP
An S code or a CGMS code is recorded in the CMI area of the disc without being scrambled;
4. The audio disc according to claim 2, wherein the audio disc is recorded by being embedded in the recording data. 5. The third layer further includes 1-bit stream data of stereo 2-channel and 1-bit stream data of multi-channel.
5. The audio disc according to claim 1, wherein bit stream data is recorded. 6. The first PCM data and the second PCM data according to claim 1, wherein the analog audio signal is converted to the first PCM data.
Encoding means for formatting into a data structure having PCM data and 1-bit stream data. 7. A decoding device comprising means for selectively decoding one of the first PCM data, the second PCM data and one bit stream data according to claim 1. 8. An analog audio signal conforming to CD standard 4.
First PCM data A / D converted at a first sampling frequency of 4.1 kHz and second PCM A / D converted from an audio signal at a second sampling frequency higher than the first sampling frequency Data, first copyright management data for managing the copyright of the second PCM data, 1-bit stream data of the analog audio signal, and 1-bit stream data for managing the copyright of the 1-bit stream data. Formatting the data structure into a data structure having the first copyright management data, transmitting the data structure through a medium, decoding the data structure transmitted through the medium, and The copyright of the second PCM data is managed based on the copyright management data, and the one video is managed based on the second copyright management data. Copyright management method and steps have to manage the copyright of bets stream data.