JPH1064199A - Optical disk for audio, and encoding device/decoding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to utilize a DVD system as a high-quality audio reproduction system, by recording identification data indicating that an audio data section is an additional stream mode to the audio data information section within a packet. SOLUTION: A prescribed stream mode is added to the stream mode of the audio packet. Respective analog audio signals of right and left two channels are recorded for two channels among the channels in the audio data section 10 of the audio packet composed in accordance with the additional stream mode. The one-bit stream data obtd. by modulating the respective audio analog signals are recorded for the remaining 8 channels. The identification data indicating that the audio data section is the additional stream mode are recorded in the audio data information section in the packet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio optical disk and an encoding device / decoding device, and
A new audio disc conforming to the D standard, which enables selective audio reproduction using audio data of both PCM and 1-bit stream, and an encoding device and decoding applied to the recording / reproducing device Related to the device.

[0002]

2. Description of the Related Art CD (C) as an optical disc for audio
Ompact Discs) have been on the market for more than ten years, and as a recording medium for audio information, it has already remarkably spread beyond the conventional cassette tape. The physical / logical format of a CD, which is a digital disk, is an EFM (Eight to Fo ...
It has been established as a modulation recording method and a data format method such as a subcode, audio data, and CRC, and CD players to which various application functions are added have been developed.

A CD audio signal has a sampling frequency of 44.1 kHz and a quantization bit number of 16 bits for the left and right channels, and has a reproduction frequency bandwidth of about 22 k.
It has characteristics of about 96 dB in Hz and S / N ratio. In the case of a CD-ROM used in the field of electronic publishing, audio data is stored in an ADPCM (Adaptive Delta Pulse Code).
Modulation), the characteristic is C
Inferior to D.

[0004] On the other hand, in recent years, the idea that the reproduction frequency bandwidth and the S / N ratio are unsatisfactory with respect to the reproduction characteristics of CDs has been established, and the standards of next-generation audio discs having more excellent characteristics have been established. Is required. Specifically, the reproduction bandwidth is 100 kHz, S /
High characteristics with an N ratio of about 144 to 120 dB are required.

As one of the systems satisfying such a demand, attention is paid to a 1-bit stream system (Japanese Patent Laid-Open No. 6-232755). According to this method, as shown in FIG. 24D, an integrating circuit, a 1-bit quantizer, a delay circuit for delaying the output of the quantizer by 1 bit, an output of the D / A converter, A ΣΔ modulator having a basic configuration consisting of a subtractor that takes the difference between input signals is used, and its 1-bit output is output as it is as a digital signal to a processing system. The conventional basic system (A) and oversampling system Compared with (B) and ΣΔ method (C), it has the following features. (1) By setting a high sampling frequency and performing noise shaving, an excellent S / N ratio can be secured with one bit. (2) Unlike the PCM method, there is no clear upper limit in the reproduction frequency band. (3) The reproduction system only needs an analog low-pass filter.
A D / A converter is not required unlike the method of (C).

According to the 1-bit stream system, the sampling frequency fs = 66 × 44.1 kHz = 2.82 M
In the case of Hz, it is possible to achieve characteristics of a reproduction bandwidth of about 100 kHz and an S / N ratio of about 120 dB. In order to obtain the characteristic by the conventional PCM data, the sampling frequency fs = 20
0 kHz, number of quantization bits = 20 bits, transmission rate:
Since 4.00 Mbps is required, the 1-bit stream method is more efficient.

[0007]

As described above, the 1-bit stream system has excellent advantages as compared with the conventional PCM system, and can sufficiently compensate for the dissatisfaction with the CD characteristics. It is expected to be used in audio equipment and spread in the future. However, most of the conventional digital audio equipment adopts the PCM system, and the data format of most recording media is necessarily P
Because of the CM system, there is no immediate switch to the 1-bit stream audio device.

On the other hand, a DVD standard has been determined toward the full-scale arrival of the multimedia era, and playback systems conforming to the standard have already been sold, and AV (Audio-V
(ideo) Software is also being supplied, and it is not unexpected that DVDs will be very widely spread as high-density recording media. DVD standards include DVD-Video for video discs and DVD-ROM for ROMs.
And a DVD-RAM for RAM use, and various configurations of the data pack are defined. These packs are shown in FIG.
FIG. 20 shows a basic pack configuration, FIG. 21 shows a video pack, FIG. 22 shows an audio pack (in the case of PCM data), and FIG.
(a) and (b) show the configuration of a DSI (Data Search Information) pack and a VBI (Video Blanking Information) pack.

Regarding audio packs, Dolby AC-3 (NTSC compatible) and MPEG
(Moving Picture Experts Group) Audio [PAL, S
ECAM compatible] is defined, and the configuration of the pack and the like are also defined for them.

[0010] Therefore, paying attention to the prospect of widespread use of DVDs, by making the 1-bit stream system relating to the audio transmission system compatible with the DVD audio standard, an excellent reproduction bandwidth and S / N ratio can be obtained. It is considered that the spread of the 1-bit stream system having a ratio can be realized at the same time. In particular, if compatibility with the audio format related to PCM data in the DVD standard is provided, it is very convenient because correlation with the transmission system of the conventional PCM system can be ensured.

[0011] Accordingly, the present invention provides the P
A new mode is added to the stream mode of the audio packet related to the audio specification of the CM data, and based on the added mode, an audio optical disc capable of recording both PCM audio data and 1-bit stream data is provided. However, it has been created for the purpose of effectively utilizing a 1-bit stream system having excellent transmission characteristics as compared with a CD or the like. Also,
The present invention also provides an encoding device and a decoding device therefor.

[0012]

According to a first aspect of the present invention, there is provided a stream mode (number of channels: 1 to 1) of audio packets related to audio specifications of PCM data defined by the DVD standard.
8) [number of channels: 10, sampling frequency: 48
kHz, the number of quantization bits: 16 bits / 20 bits], and two channels of the left and right channels are added to two channels of the audio data portion in the audio packet configured based on the added stream mode. Data obtained by modulating an analog audio signal by the PCM method using [sampling frequency: 48 kHz, quantization bit number: 16 bits / 20 bits] is recorded, and the above-described audio analog signals are 1-bit quantized in the remaining 8 channels. Of [Transmission speed: 3.072 Mbps / 3.840 Mbps] obtained by modulating with the ΣΔ modulation method
The present invention relates to an optical disc for optical recording, wherein bit stream data is recorded and identification data indicating that the audio data section is in the additional stream mode is recorded in an ADI section in a packet.

At present, a stream mode (number of channels: 1 to 1) of an audio packet (PCM) defined on a DVD.
The basic standard according to 8) (transmission speed: 6.144 Mbps) is shown in Table 1 below.

[0014]

[Table 1]

After the above-mentioned standard was determined, it was pointed out that the transmission speed was insufficient, and there was a demand that an extended standard capable of securing a transmission speed of 9.8 Mbps be provided.
There is a trend toward the establishment of the standards shown in (1).

[0016]

[Table 2]

According to the present invention, the stream mode (number of channels:
It is assumed that the standard of 10) is added. In addition, 1
Other values can be selected for the maximum number of samples and the data size of the data in the packet, and are not limited here.

[0018]

[Table 3]

According to the present invention, PCM data recorded on two channels in a stream is 1.536 Mbps.
(= 2 channels left and right x 16 bits x 48 kHz) or 1.
920Mbps (= 2 channels left and right x 20 bits x 48k
Hz). On the other hand, the 1-bit stream recorded on the remaining 8 channels is 4 times the transmission speed.
(= 8/2) transmission speed: 6.144 Mbps (= 1.536 Mb)
ps × 4) or 7.680 Mbps (= 1.920 Mbps × 4). Each of the left and right audio analog signals is modulated by a ビ ッ ト Δ modulation method using 1-bit quantization, and the transmission speed is 3.072 Mbps or 3 respectively. In the case of .840 Mbps 1-bit stream data, 1-bit stream data of two channels on the left and right is exactly contained in the eight channels. That is, based on the stream modes shown in Table 3, each stream can be configured while associating audio PCM data for two channels on the left and right with 1-bit stream data in time series. Therefore, an audio pack having an audio data portion with the above data arrangement is recorded on the optical disk, and the PCM playback mode and the 1-bit stream playback mode are selectively set to change the stream format for two channels. By selectively decoding and reproducing only one of the PCM data and the remaining 8 channels of 1-bit stream data, the reproduction based on the audio specification of the DVD standard and the reproduction of the 1-bit stream data with excellent characteristics can be achieved. Becomes possible.

According to a second aspect of the present invention, there is provided an encoding apparatus for creating recording data for an audio optical disc according to the first aspect of the invention, wherein each of the left and right two channel analog audio signals is modulated by a ビ ッ ト Δ modulation method by 1-bit quantization. Each of the modulating means for obtaining a 1-bit stream of [transmission rate: 3.072 Mbps / 3.840 Mbps] and the 1-bit stream data output by each of the modulating means are sampled at a sampling frequency of 48 kHz and a quantization bit number of: 16-bit / 20-bit] PCM data;
The output data of each of the data conversion means is allocated to two channels, and the output data of each of the modulation means is allocated to the remaining eight channels to form a stream of an audio data part, and is identified to an ADI part in a packet. The present invention relates to an encoding device including a formatting means for recording and outputting data.

According to the encoding apparatus of the present invention, the analog audio signal of each of the left and right channels is converted into a 1-bit stream by a 手段 Δ modulation type modulation means by 1-bit quantization.
(Transmission speed: 3.072 Mbps / 3.840 Mbps), and the data is converted by data conversion means into PCM data (sampling frequency: 48 kHz, quantization bit number: 16 bits / 2).
0 bit). Then, the formatting means converts the PCM data into one based on the stream mode shown in Table 3 above.
A stream is formed by allocating two channels out of zero channels and allocating one bit stream data to the remaining eight channels. Since the audio optical disk is based on a special stream mode, it is necessary to show the fact. In the DVD standard, an ADI section is provided in a packet as shown in FIG. When creating a packet, identification data is recorded in the ADI unit.

According to a third aspect of the present invention, in the audio optical disc according to the first aspect, each of the left and right two-channel analog audio signals is sampled into two channels of an audio data portion in an audio packet [sampling frequency: 44.1].
kHz, the number of quantization bits: 16 bits / 20 bits], and the data volume of the PCM data in the audio data part is (44.1).
/ 48), the "0" bit is inserted for the amount reduced to
In addition, the identification data and audio data part PC are provided in the ADI part.
According to the present invention, there is provided an audio optical disk on which discrimination data indicating that a sampling frequency of M data is 44.1 kHz is recorded.

According to the present invention, recording for two channels in a stream is performed at a sampling frequency of 4 as in the first invention.
This is not PCM data of 8 kHz but PCM data of sampling frequency: 44.1 kHz, which is generalized in the specification of CD. In this case, since the sampling frequency is low, the amount of PCM data in the packet is (44.1 / 48).
As a result, PCM data and 1-bit stream data are not allocated to all streams in a packet at a ratio of 2: 4 as in the disk of the first invention, and blank bits are present on the PCM data side for two channels. Will happen. Therefore, in the audio optical disk of the present invention, in order to maintain the consistency of the number of bits of each data in the packet by inserting "0" bits into the blank bits and to distinguish it from the disk having a sampling frequency of 48 kHz, The discrimination data indicating this is recorded in the ADI section.

According to a fourth aspect of the present invention, there is provided an encoding apparatus for creating recording data for an audio optical disk according to the third aspect of the present invention, wherein each of the left and right analog audio signals is modulated by a ビ ッ ト Δ modulation method by 1-bit quantization. Each of the modulating means for obtaining a 1-bit stream of [transmission rate: 3.072 Mbps / 3.840 Mbps] and the 1-bit stream data output by each of the modulating means are sampled at a sampling frequency of 44.1 kHz and a quantized bit of Number: 16 bits / 20
Bit] PCM data, the output data of each of the data conversion means is allocated to two channels, and the output data of each of the modulation means is allocated to the remaining eight channels, and an audio data portion is allocated. And the data amount of PCM data in the audio data portion is reduced to (44.1 / 48), a "0" bit is inserted, and identification data and discrimination data are recorded in the ADI portion. The present invention relates to an encoding device provided with a formatting means for outputting the data.

According to the present invention, based on the characteristics of the audio optical disk according to the third invention, it is determined that the sampling frequency of each data conversion means is 44.1 kHz and that the formatting means inserts a "0" bit. Although it differs from the encoding device according to the second aspect in having a function of recording data, it has basically the same configuration as that of the encoding device.

According to a fifth aspect of the present invention, there is provided a decoding apparatus for decoding recording data of an audio optical disc according to the first or third aspect, wherein a mode setting for selectively setting a PCM decoding mode and a 1-bit stream decoding mode. Means, a confirmation means for confirming that the disc is the audio optical disc by detecting the identification data of the ADI portion read from the disc, and an audio signal when the confirmation means confirms that the disc is the audio disc. Each stream in the data section is decomposed, and only PCM data for two channels is output when the PCM decoding mode is set by the mode setting means, and one bit for eight channels is output when the 1-bit stream mode is set. Format decomposer that outputs only stream data A first channel separating unit that separates the PCM data output by the format decomposing unit into two left and right channels and forms PCM data for each of the separated channels; and a left and right channel configured by the first channel separating unit. D / A conversion means for individually D / A-converting the data of two channels, and 1-bit stream data output by the format decomposing means are separated into two left and right channels, and the 1-bit stream data for each separated channel is separated. The present invention relates to a decoding apparatus, comprising: a second channel separating means to be constituted; and low-pass filters for filtering data of two right and left channels formed by the second channel separating means.

According to the fifth aspect, the audio optical disc according to the first or third aspect includes a PCM in the stream.
Data and 1-bit stream data, but the confirmation means first confirms that the disc is the optical disc from the identification data of the ADI unit, and the format decomposing means divides the read data into two channels of PCM data and eight channels. Then, any one of the data is output based on the mode set in advance by the mode setting means. And
In either mode, the data is divided into two channels, left and right, by channel separation means to form a data stream with continuity. In the PCM decode mode, the PCM data of the left and right two channels are converted into analog signals by D / A conversion means. In the 1 bit stream mode, FIG.
As shown in (D), the 1-bit stream data of the left and right channels are each filtered by a low-pass filter to obtain an analog signal. If the confirmation means also detects the discrimination data and confirms that the disc is the disc according to the third invention, the "0" bit is treated as non-reproduced data.

By the way, according to the data arrangement of the optical disc for audio of the first invention, the Dolby surround system or other multi-channel system is used for two channels of the audio data part in the audio packet.
(For example, Dolby AC-3 system, DTS system, SDD
It is also possible to record PCM data obtained by encoding an analog audio signal of the S method (eg, the S method), and record band-compressed 1-bit stream data of the number of channels corresponding to each method in the remaining eight channels. Note that recording the identification data indicating that the audio data section is in the additional stream mode and the data of the multi-channel system in the ADI section in the packet is as follows.
This is the same as the disk of the first invention.

In this case, as for the encoding device, 1
Encoding means for encoding a 1-bit stream obtained from each modulation means of the ΣΔ modulation method by bit quantization by an encoding method corresponding to the multi-channel method is required, and the encoded data is converted by the data conversion means into [sampling frequency: 48 kHz. , Quantization bit number: 16 bits / 2
0 bit] PCM data and recorded on two channels of the audio data part. Also, as described above, 1-bit stream data of each channel is 2 / N (N is a channel of a multi-channel system). The band compression means for performing band compression is required in (2), and the output of each band compression means is recorded in the remaining eight channels of the audio data part. On the other hand, as for the decoding device, basically, the configuration in which the reproducing unit has N channels in the decoding device of the fifth invention may be applied, but since PCM data for two channels is encoded, the first device is used. A decoding means corresponding to the encoding method on the encoding device side is required between the channel separation means and each D / A conversion means.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the "optical disc for audio and encoding / decoding device" of the present invention will be described below in detail with reference to FIGS. << Embodiment 1 >> Embodiment 1 relates to the optical disc for audio according to the first invention and the encoding device according to the second invention. First, FIG. 1 shows a block circuit diagram of the encoding device. In this figure, 1, 2 are analog low-pass filters (LPF), 3, 4 are analog ΣΔ modulators similar to those shown in FIG. 24D, and 5, 6 are 1-bit stream data to PCM data. A data converter 7 for converting, a formatter 7 for creating an audio pack formatted based on the input data of the four systems,
Reference numeral 8 denotes a modulator for modulating the data of the audio pack into a recording signal (DVD specification).

The operation of the encoding device will be described as follows. However, as shown in FIG.
Up to 7, the circuit configuration is for two channels (L, R). Of course, the circuits of each channel are the same and the operation is the same, so only the L channel side will be described here. . First, the audio analog signal is input to the analog LPF 1, band-limited, and then input to the analog ΣΔ modulator 3. Where analog Σ
The Δ modulator 3 performs ΣΔ modulation by 1-bit quantization on the input analog signal, and outputs a 1 at a transmission rate of 3.072 Mbps.
The bit stream data is output, and the 1-bit stream data has the spectrum of the input signal as it is even though it is a digital signal.

In the encoding apparatus, the one-bit stream data is directly input to the formatter 7 and the one-bit stream data is input to the data converter 5.
From the bit stream data, [Transmission frequency: 48 kHz,
The number of quantization bits: 16 bits] is generated, and the PCM data is also input to the formatter 7.

Accordingly, the formatter 7 transmits the PCM data A (L), A (R) having a transmission frequency of 48 kHz and the number of quantization bits of 16 bits for the two channels (L, R) and the two channels (L, R). , R) per bit stream data B (L), B (R)
Is input. Here, the formatter 7 adds [the number of channels: 10, the sampling frequency: 48 kHz, the number of quantization bits: 16 bits] in Table 3 added to the audio specifications (PCM data) of the DVD standard.
Stream mode (10)
The stream is configured such that 16-bit PCM data related to L and R is allocated to two channels in each channel, and 128 bits of 1-bit stream data are allocated to the remaining eight channels. Incidentally, 16 bits correspond to the number of quantization bits in the stream mode, and correspond to one sample of the audio signal.

Specifically, in the configuration shown in the lower diagram of FIG. 2, two channels (L, L) are assigned to ch0 and ch1 in each stream.
R) PCM data is assigned and 2 channels
The (L, R) 1-bit stream (upper diagram in FIG. 2) is divided into 16 bits, and each bit string of 16 bits is divided into ch.
L and R are allocated so that half and half of L and R are included in 2 to ch9.

In that case, the PCM data side is 1.536 Mb.
The transmission speed is ps (= 2 channels on the left and right x 16 bits x 48 kHz), and the 1 bit stream side has 2 channels
6.144 Mbps (= 2 channels × 3.07) in (L, R) minutes
2Mbps), but the PCM in the stream
Since the allocation ratio between data and one bit stream is 2: 8, which is equivalent to 1.536 Mbps: 6.144 Mbps, each stream can be configured while associating PCM data with one bit stream data in time series. become.

The formatter 7 configures an audio data portion with a maximum of 10 streams,
One pack is constituted by the structure of the audio pack shown in FIG. 8, but identification data for indicating that the data structure is based on the stream mode shown in Table 3 and includes one bit stream data is written in the ADI unit. .

Then, the formatter 7 outputs the data of the four systems sequentially transferred as described above to the modulator 8 while collecting the data in a pack. The data is modulated by the modulation method and written on the optical disk. As a result, the identification data is written in the ADI portion, and the audio pack in which the audio data portion has the data configuration of FIG. 2 (lower diagram) is continuously recorded.
Since the PCM data and the 1-bit stream data correspond in each stream unit, an audio disc is represented by two types of data while corresponding to the same music in chronological order.

The above description is based on the assumption that the number of channels: 10, the sampling frequency: 48 kHz, the number of quantization bits: 16 bits among the additional stream modes shown in Table 3. The other additional stream mode [number of channels: 10, sampling frequency: 48 kHz
z, the number of quantization bits: 20 bits], the transmission rate of the analog ΣΔ modulator 3 is 3.840M.
The one that outputs 1-bit stream data of bps is applied, and the data converters 5 and 6 convert the 1-bit stream data into [transmission frequency: 48 kHz, number of quantization bits:
20 bit] PCM data is applied.

The formatter 7 has a configuration as shown in the lower diagram of FIG.
The (L, R) PCM data is stored in ch0 and ch1 in each stream.
, A 1-bit stream is divided into 20 bits, and each of the divided bit strings is assigned to ch2 to ch9.
1.920Mbps (= 2 channels on left and right x
The transmission speed is 20 bits x 48 kHz), and the 1 bit stream side is 7.680 Mbps for 2 channels (L, R).
(= 2 channels × 3.840 Mbps). As a result, the allocation ratio of PCM data and 1-bit stream in the stream becomes 2: 8, and [number of channels: 10, sampling frequency: 48 kHz, number of quantization bits:
16 bit] additional stream mode,
Each stream can be configured while associating PCM data and 1-bit stream data in time series.

<< Embodiment 2 >> In this embodiment, the transmission frequency of the PCM data is not 48 kHz but the audio optical disk and the encoding device of the embodiment 1.
This corresponds to the third and fourth inventions in the case where the frequency is 44.1 kHz. In this case, a selection command of 44.1 kHz is given to each of the data converters 5 and 6 in advance, and the conversion mode is set to 44.1 kHz. Therefore, the analog ΣΔ modulators 3 and 4 generate 1-bit stream data having a transmission rate of 3.072 Mbps and format the data.
7 is the same as in the first embodiment,
For the M data, the data converters 5 and 6 input the transmission frequency of 44.1 kHz to the formatter 7.

In the first embodiment, since the transmission frequency of the PCM data is 48 kHz, it is possible to allocate each bit stream with the time series consistency with the 1-bit stream data having a transmission rate of 3.072 Mbps in each stream. there were. However, when the transmission speed of the PCM data becomes 44.1 kHz, the data amount of the PCM data in the audio data portion in each packet becomes (44.1 kHz) as compared with the case of the first embodiment.
/ 48), and in the stream mode shown in Table 2 above, 32.5 bytes [= 2000 bytes] in one pack
× (2/8) × {1- (44.1 / 48)}].

In this embodiment, therefore, the formatter 7 reduces the amount of PCM data generated in packs by 3
2.5 bytes (= 260 bits) are filled with "0" bits. Specifically, the last two bits of ch0 and ch1 of the 92nd stream of the audio data section are set to “0” bits, and
All ch1s are filled with "0" bits. The formatter 7 writes discrimination data indicating that the transmission frequency of the PCM data is 44.1 kHz together with the identification data in the ADI portion of each packet. Then, the modulator 8 modulates the data of each pack and records it on the optical disc in the same manner as in the first embodiment, but the "0" bit is recorded as a non-reproduced signal.

As described above, the transmission frequency of the PCM data is set to 4
The reason why the frequency is 4.1 kHz is that the PCM data in the CD has the transmission frequency, and it is often convenient if the compatibility with the data transmission system of the CD which is already widely used is provided.

In the above description, among the additional stream modes in Table 3, [number of channels: 10, sampling frequency:
48 kHz, the number of quantization bits: 16 bits], but as in the first embodiment, [channel number: 10, sampling frequency: 48 kHz, quantization bits: 20 bits] is added. Naturally, the present invention can be applied to the stream mode.
The “0” bit, which is a non-reproduced signal, is recorded by an amount corresponding to the data amount of M data reduced to (44.1 / 48).

<< Embodiment 3 >> This embodiment relates to a decoder device for reproducing an audio optical disk recorded using the encoder device of each of the above embodiments.
This corresponds to the fifth invention. In the present embodiment, the DV
An example in which the above-described decoder device compatible with the optical disc for audio is mounted in the D reproduction system will be described.

First, FIG. 3 shows a system circuit diagram of a DVD reproducing system. In the figure, 11 is a reading unit for reading a signal from a DVD or an audio optical disk 10 recorded in each of the above embodiments, 12 is a drive control circuit for controlling the drive of the reading unit, 13 is a demodulation circuit / error correction circuit, 14 is a track buffer that temporarily accumulates read track data, 15 is a write control circuit that controls writing of read data to the track buffer 14, 16 is a read control circuit that controls data reading from the track buffer 14,
Reference numeral 17 denotes a system buffer for temporarily storing various control signals included in data read by the reading unit 11, and reference numeral 18 denotes V
BV buffer, 19 is sub picture buffer, 20 is VBI
Buffer, 21 is an audio buffer, 22 is a DSI buffer, 23 is a multiplexer for distributing each data read from the track buffer 14 by the read control circuit 16 to the corresponding buffers 18 to 22, and 23 is a decoder for decoding video data of a VBV buffer. A video decoder, 24 is a sub-picture decoder for decoding sub-picture data in the sub-picture buffer 19, 25 is a VBI decoder for decoding VBI data in the VBI buffer, 26 is a letterbox converter for converting the decoded video data, and 27 is a letterbox converter. An adder for adding the decoded and converted video data to the decoded sub-picture data and VBI data to obtain a video output; 29, an audio decoder for decoding audio data in an audio buffer 21, 30 for an operation unit, 31 for display Department, 32 controls the entire system The system controller, 33-35 parameter storage unit the system controller utilizes to, 36 is a system timer.

The DVD reproducing system is designed to operate the DVD or audio optical disc 10 set in the reading section 11.
The signal read from the video playback signal or 2 channels
Although the video reproduction function is output as an (R, L) audio reproduction signal, its video reproduction function is easily understood from FIG. 3 and is not the subject of this embodiment, so that the description thereof is omitted here. On the other hand, the subject of this embodiment lies in how the audio decoder 29 decodes the audio data read from the audio optical disc 10 recorded in each of the above embodiments. Therefore, in this embodiment, a description will be given focusing on the sequence of the system and the operation of the audio decoder when the audio optical disc 10 is set in the reading unit 11 and reproduced.

As shown in FIG. 3, the audio decoder 29 analyzes the audio pack input from the audio buffer 21 while decomposing it into PCM data and 1-bit stream data and outputting them to the A side and the B side. Format separator 41, two channel separators 42 and 43 corresponding to the A-side output and the B-side output, and D / A converting and reproducing the two-channel (R, L) output of the channel separator 42. It comprises D / A converters 44 and 45 for outputting signals, and analog LPFs 46 and 47 for filtering the two-channel (R, L) outputs of the channel separator 43.

The disc 10 contains PCM data and 1
Since two types of data of the bit stream are recorded, the operator selects the reproduction mode of the audio optical disc 10 in advance, and the procedure in that case is shown in FIG. As shown in the figure, when the PCM playback mode or 1-bit stream playback mode is input from the operation unit 30, an instruction is input.
The system controller 32 sets the program of the format decomposer 41 corresponding to the instruction mode, and displays the setting instruction mode on the display unit 31 (S1 to S5).

Next, an operation procedure when each of the above-mentioned reproduction modes is set will be described with reference to the flowchart of FIG. When a disc playback instruction is given from the operation unit 30, the reading of the disc 10 is started, and the first packet is transferred to the audio buffer 21, but the format decomposer 41 reads the ADI unit at the time when the ADI unit is detected. Check whether there is identification data and discrimination data (S11
~ S13). The identification data indicates that the disc is the disc 10 recorded by the encoding device of the first or second embodiment. If there is no discrimination data, the disc is a disc such as a DVD-ROM or a DVD-Video that cannot be reproduced by itself. The user responds by stopping the reproduction operation and displaying the fact on the display unit 31. On the other hand, when the identification data is present, it is confirmed that the disc is the disc 10, and it is confirmed whether the preset reproduction mode is PCM or 1-bit stream by the procedure of FIG. If there is no discrimination data in the previous confirmation, the sampling frequency of the PCM data of the disk 10 is 48 kHz (S13, S14).

Therefore, the format decomposer 41 operates at 48 kHz.
In addition to the setting of the z mode, ch0-1 and ch2-9 of each stream transferred from the audio buffer 21 are decomposed, and only the PCM data of ch0-1 of the streams are output (S15, S16). Then, the channel separator 42 having received the transfer of the PCM data transfers the data of ch0 to the D / A converter 44 on the L channel side when the stream configuration is as shown in the lower diagram of FIG. , Ch1 data to the D / A converter 45 on the R channel side.
Outputs an audio reproduction signal (S17).

On the other hand, if the discrimination data exists in step S13, the sampling frequency of the PCM data on the disk 10 is 44.1 kHz (S13 → S18).
In this case, the format decomposer 41 operates at 44.1 kHz.
Just by setting the mode, ch0-1 and ch2-9 of the transfer stream are decomposed in the same manner as described above, and the channel
Only the PCM data of 0 to 1 is output, and the D / A converters 44 and 45 output audio reproduction signals via the channel separator 42 (S19 to S21).

When the 1-bit stream reproduction mode is set in the procedure of FIG. 4, the format decomposer 41 decomposes ch0-1 and ch2-9 of each stream transferred from the audio buffer 21. Up to the procedure is the same as above, but under this mode setting,
Only one bit stream data of 2 to 9 is output (S
22, S23). Then, the channel separator 43 that has received the transfer of the 1-bit stream data has the stream configuration shown in FIG.
When the data is as shown in the lower diagram, the data of ch2 to 5 are output to the LPF 46 and the data of ch6 to 9 are output to the LPF 47, and each of the D / A converters 44 and 45 outputs the audio reproduction signal. Output (S24).

Therefore, according to the decoder of this embodiment, by setting the reproduction mode in which the data type is specified, it is possible to perform selective reproduction using PCM data or 1-bit stream data. In this embodiment, the DVD playback system reproduces the audio optical disc 10 recorded by the encoder of the first or second embodiment. However, since the disc 10 records both of the above data, the PCM data is reproduced. Playback can also be performed by a dedicated playback device or a playback device dedicated to 1-bit stream data.

Fourth Embodiment The basic data configuration of the audio optical disc of the first embodiment is not only for recording left and right two-channel audio signals, but also for recording PCM data that encodes multi-channel audio signals and one. It is also possible to record bit stream data. That is, [Number of channels:
10, sampling frequency: 48 kHz, quantization bit number: 16
Bits / 20 bits], the data obtained by encoding each analog audio signal of the multi-channel (N-channel) system in two channels of the audio data part by an encoding system corresponding to the system in two channels of the audio data part. Is converted into PCM data of [sampling frequency: 48 kHz, quantization bit number: 16 bits / 20 bits] and recorded, and the above-mentioned audio analog signals are subjected to １Δ modulation by 1-bit quantization for the remaining 8 channels. [Transmission speed: 3.072 Mbps /
[3.840 Mbps] 1-bit stream data is band-compressed to 2 / N and recorded, and the ADI part in the packet has the audio data part in the additional stream mode and the multi-channel data. It is possible to provide an audio optical disk on which identification data indicating the fact is recorded.

The PCM data recorded on the two channels of the audio data portion on the optical disk is encoded data corresponding to the multi-channel system, but the remaining eight channels are each provided with 1 / N stream data of 2 / N. Since the band-compressed data is recorded in the stream, the data allocation ratio between the PCM data and the 1-bit stream in the stream is 2: 8 as in the first embodiment, and the ratio is 1.536 Mbps: 6.144 Mb.
Since ps or 1.920 Mbps: 7.680 Mbps, each stream can be configured by associating PCM data with 1-bit stream data in time series.

Here, typical examples of the multi-channel analog audio include a Dolby surround system, a Dolby AC-3 system, a DTS system, and an SDDS system. Therefore, in this embodiment, the data structure of an audio optical disc corresponding to each of the multi-channel systems will be clarified by specifically describing the encoding device and the decoding device according to each of the above-described multi-channel systems.

In the case of the Dolby surround system; the audio analog signal of this system is the front three channels (L,
C, R) and the rear channel (S) are four channels, and a block circuit diagram of the encoding device is shown in FIG. The circuit configuration shown in the figure differs from the encoding device of the first embodiment (FIG. 1) in that: a. As described above, since the audio analog signal has four channels, LP
F51 and an analog ΣΔ modulator 52 for four channels, b. Each analog ΣΔ modulator
52 1-bit stream output is encoded by Dolby Surround method and encoded data of two channels (Lt, R
a) a Dolby surround encoder 53 for obtaining t) is provided; c. The point that each one bit stream output (transmission rate: 3.072 Mbps) of each analog ΣΔ modulator 52 is input to a formatter 58 via a digital filter 57 for performing １ ／ band compression; and d. Formatter
58 assigns PCM data output from each data converter 54, 56 to two channels in the lower diagram of FIG.
A 1-bit stream after band compression output by the digital filter 57 is assigned to each channel. The ADI section in the packet indicates that the audio data section is in the above-mentioned additional stream mode and is data of the Dolby surround system. The point is to record the identification data.

The Dolby surround encoder 53
FIG. 7 is a functional block diagram showing the function of executing the analog-based encoding process shown in FIG. 7 on a digital basis. That is, C is attenuated by the 3 dB attenuating circuit 64 and is mixed with L and R in the same phase while the data of L and R are kept as it is, and S advances the predetermined processing signal by the processing circuit 65 by 90 ° with respect to L. , R with phase 9
Encoding data (Lt, Rt) is obtained by mixing with a delay of 0 °.

Therefore, according to the data allocation by the formatter 58, the transmission frequency of PCM data for two channels of the audio data part is 1.536 Mbps (= two channels on the left and right × 16 bits × 48 kHz), and the remaining eight channels 1 bit stream data is 6.144 Mbps (= 4.times.3.072 Mbps.times.1 / 2) since it is band-compressed to 1/2 by the digital filter 57, but as in the first embodiment. , P in the stream
The allocation ratio between the CM data and the 1-bit stream is 2: 8, and each stream can be configured while the PCM data and the 1-bit stream data are made to correspond in time series.

On the other hand, on the decoding device side, the decoding device of the first embodiment (FIG. 3) can be applied as a basic configuration, but its audio decoder 29 needs to have a circuit configuration as shown in FIG. That is, on the PCM data side, after the format-decomposed PCM data is separated into two-channel (Lt, Rt) encoded data by the channel separator 59, the original four channels (L, C, S) are separated by the Dolby surround decoder 60. , R) data, and decode data of each channel is provided to an individually provided D
The signal is converted into an analog reproduction signal by the / A converter 61 and output. On the 1-bit stream side, the format-decomposed 1-bit stream data is separated into four channels by the channel separator 62, and the individually provided L
The signal is converted into an analog reproduction signal by the PF 63 and output.

The Dolby surround encoder 60
The functional block diagram shown in FIG. 9 has the function of executing the analog-based encoding process shown in FIG. 9 on a digital basis. Specifically, Lt and Rt are L
VCA (Vol.
tage Control Amplifier, 0 ~ -30dB) 67,
VCA using (Lt + Rt) by a signal adder as a C channel and (Lt−Rt) by a signal subtractor as an S channel
And the control circuit 66 outputs Lt, Rt, (Lt + Rt), (Lt-R
While detecting t), the VCA 67 for four channels is controlled to obtain output data for reproduction of the L, C, S, and R channels.

The above encoding apparatus and decoding apparatus are shown in Table 3 [number of channels: 10, sampling frequency:
48 kHz, the number of quantization bits: 16 bits], but other additional stream modes [number of channels: 10, sampling frequency: 48 kHz]
z, the number of quantization bits: 20 bits], each analog ΣΔ modulator 52 outputs a one-bit stream of 3.840 Mbps, and the conversion mode of the data converter 54 is set to [sampling frequency: 48 kHz, If the number of quantization bits is 20 bits], it is in principle clear that an encoding device and a decoding device corresponding to the additional stream mode can be configured. Embodiment 2
As in the case of the above, the sampling frequency of the data converters 54 and 56 can be switched to 44.1 kHz, and non-reproduction is performed by the amount of the PCM data in the audio data portion reduced to (44.1 / 48). It is also possible to record a "0" bit as a signal.

In the case of the Dolby AC-3 system; the audio analog signal of this system is the front three channels (L,
FIG. 10 shows a block circuit diagram of an encoding device of the six channels including C, R), a bass reinforcement channel (SW), and two rear channels (LS, RS).
In the circuit configuration of FIG.
(FIG. 1) is different from a. As described above, the input circuit including the LPF 51 and the analog ΣΔ modulator 52 is provided for six channels so that the audio analog signal has six channels, b. A Dolby AC-3 encoder 68 that encodes a 1-bit stream output of each analog ΣΔ modulator 52 by a Dolby AC-3 method to obtain a series of encoded data; c. 1-bit stream output of each analog ΣΔ modulator 52 (transmission rate: 3.072
Digital filter 70 that performs 1/3 band compression
And d. Input to the formatter 71 via d. The formatter 70 outputs the P output from the data converter 69.
The CM data is allocated to two channels in the lower diagram of FIG. 2, and the band-compressed 1-bit stream output from the digital filter 70 is allocated to the remaining eight channels. Dolby AC with the additional stream mode
The point is that identification data indicating that the data is of the -3 system is recorded. Therefore, in the case of the Dolby surround system
Compared to FIG. 6, the Dolby AC-3 encoder 68 is applied, the band compression ratio of the digital filter 70 is 1/3, and the formatter 71
This is the same except that the identification data recorded in the sections are different. Here, the band compression ratio of the digital filter 70 is set to 1/3 because the Dolby AC-3 system is 6 bands.
This is because the channel (L, C, R, SW, LS, RS) is targeted, whereby the allocation ratio of PCM data in the stream and 1-bit stream in the audio data section can be set to 2: 8.

The functional block diagram of the Dolby AC-3 encoder 68 has a configuration as shown in FIG. 11, and operates as follows. First, a 1-bit stream of each input channel is subjected to frequency analysis (MDCT: Modified Discrete Cosine Transfo
rm), the time sample is converted into a frequency component, and the converted signal is quantized by each quantizer 73 and transferred to the multiplexer 74. Also, one bit stream of each channel is also input to the bit allocation unit 75,
The sub information for bit allocation is created, and the information is transferred to the bit allocation unit 76 of the core. On the other hand, the output of each filter bank 72 is also input to the spectrum envelope encoder 77, and the data obtained by differentially encoding the spectrum envelope in the frequency domain is input to the core bit allocator 76 and the multiplexer 74. ing. The bit allocating unit 76 of the core creates bit allocation information for each quantizer 73 based on the above-mentioned sub information and the differentially encoded data obtained from the spectrum envelope, and outputs it to each quantizer 73. Each quantizer
Numeral 73 quantizes the signal input from each filter bank 72 based on the input bit allocation information, and a multiplexer 74 controls the differential encoded data and the bit allocation unit.
The data input from each quantizer 73 is collectively output as a series of encoded bit streams while referring to the sub-information obtained from 75. Further, the multiplexer 74 adds the difference coded data and the sub-information related to the bit allocation to the corresponding coded bit stream and outputs it. As a result, perceptual masking characteristics in consideration of psychoacoustics are obtained for the bit allocation that becomes the core based on the spectrum envelope, and the sub-information relating to the theoretically most accurate bit allocation is calculated in the bit allocation unit 75. Therefore, an encoded bit stream to which adaptive bit allocation with high compression efficiency has been performed is obtained as the output of the multiplexer 74.

On the other hand, on the decoding device side, the decoding device of the first embodiment (FIG. 3) can be applied as a basic configuration, but the audio decoder 29 has a circuit configuration as shown in FIG. First, on the PCM data side, Dolby AC-3 decoder 78 converts the format-decomposed PCM data to the original six channels (L, C, R, SW, LS, R).
S) The data is decoded into data, and the decoded data of each channel is converted into an analog reproduction signal by a D / A converter 79 provided separately and output. On the 1-bit stream side, the format-decomposed 1-bit stream data is separated into 6 channels by a channel separator 80, and converted into an analog reproduction signal by an individually provided LPF 81 to be output.

Here, a functional block diagram of the Dolby AC-3 decoder 78 is shown in FIG. 13 and has a function opposite to that of the encoder (FIG. 11). First, the demultiplexer 82 separates the input coded bit stream into channel-specific bit streams, outputs the bit stream to each inverse quantizer 83, and adds differential encoded data obtained from a spectrum envelope as additional information. The sub information related to the bit allocation is transferred to the spectrum envelope decoding unit 84 and the core bit allocation unit 85, respectively. The core bit allocation unit 85
Using the difference data and the sub information decoded by the spectrum envelope decoding unit 84, bit allocation data for each channel is created, and the data is output to each inverse quantizer 83. Each inverse quantizer 83 performs inverse quantization with reference to the bit allocation data, and outputs the data to each filter bank 86.
The frequency components are converted into time samples by CT and each D /
Output to the A converter 79.

In the case of the DTS system; this system also has six channels (L, C, R, S
W, LS, RS). Therefore, regarding the encoding device and the decoding device, Dolby AC-3
In the case of the system (FIGS. 10 and 12), only the encoder 68 and the decoder 78 are replaced with those for the DTS system, and the other basic configurations are the same.

FIG. 14 is a functional block diagram of the DTS encoder. The 1-bit stream created by the analog ΣΔ modulator 52 for each channel is input to a 32-band decimation filter bank 87 provided in an encoding unit for each channel, and is divided into 32 sub-band samples. . Each subband sample is quantized by a vector quantization unit 88 and an adaptive differential PCM (ADPCM).
M) 89, the difference between the true value and the predicted value of the input signal is adaptively quantized with reference to the quantized data. next,
The quantized data by the ADPCM 89 and the quantized data by the vector quantizer 88 for each subband are respectively subband code data (Dsi) and side information.
The signal is input to the multiplexer 90 as (SIi), and the multiplexer 90 combines Dsi and SIi for 32 bands into one series of data and outputs the data to the code compression unit 91. Code compression section
At 91, encoding and compression are performed by determining the transient characteristics of the input data, and the compressed data is output to the stream synthesizing unit 92.
The above-described encoding process is individually performed for six channels, and the coded compressed data for six channels is input to the stream synthesizing unit 92. The stream synthesizing unit 92 encodes the data in one series. The data is output to the data converter 69 as a bit stream.

FIG. 15 is a functional block diagram of the DTS decoder. First, the coded bit stream obtained by the format decomposition is decomposed into six channels by the stream decomposing unit 93, and the decomposed data for each channel is decoded by the code expansion / reproduction unit 94, and the decoded data Is input to the demultiplexer 95 of the decoding unit provided for each channel. next,
The demultiplexer 95 separates the decoded Dsi and SIi into 32 subbands, and an inverse ADPCM section 96 provided for each subband separates the quantized difference data between the true value and the predicted value of the input signal into subband samples. And outputs it to the 32-band decimation filter bank 97. Then, the 32-band decimation filter bank 97 synthesizes 32 sub-band samples to obtain decoded data of the channel. Therefore, the input coded bit stream is output as D / A converters 79 for each channel as decoded data of six channels.

In the case of the SDDS system; the audio analog signal of this system is composed of five forward channels (L, LC, C, and R).
FIG. 16 shows a block circuit diagram of an encoding device for eight channels including C, R), a bass enhancement channel (SW), and two rear channels (LS, RS).
In the circuit configuration of FIG.
(FIG. 1) is different from a. As described above, the input circuit including the LPF 98 and the analog ΣΔ modulator 99 is provided for eight channels so that the audio analog signal has eight channels, b. A point where an SDDS encoder 100 for encoding a 1-bit stream output of each analog ΣΔ modulator 99 by the SDDS method to obtain one series of encoded data is provided; c. Each 1-bit stream output (transmission speed: 3.072 Mbps) of each analog ΣΔ modulator 52 is 1/4
Input to a formatter 102 via a digital filter 101 for performing band compression; and d. The formatter 102 allocates the PCM data output from the data converter 69 to two channels in the lower diagram of FIG. 2, and allocates the band-compressed 1-bit stream output from the digital filter 70 to the remaining eight channels. However, the present invention is characterized in that the audio data portion is recorded in the ADI portion in the packet in the additional stream mode and identification data indicating that the data is SDDS format data. Therefore, as compared with the case of the Dolby surround system (FIG. 6), the SDDS encoder 100 is applied, the band compression ratio of the digital filter 101 is 1/4, and the formatter 102 records in the ADI unit. The same is true except that the identification data used is different. here,
The band compression ratio of the digital filter 101 is set to 1/4 because the SDDS method targets eight channels, thereby reducing the allocation ratio of PCM data in a stream and one bit stream in the audio data part. 2: 8.

A functional block diagram of the SDDS encoder 100 is shown in FIG. The encoder 100 encodes 8-channel 1-bit stream data obtained from each analog ΣΔ modulator 99 by the ATRAC encoding unit 103, compresses the data to about 1/5, and formats the data.
At 104, time information is added to each compressed data, and the compressed data is put together into a series of encoded bit streams. Note that the ATRAC encoding unit 103 divides the input data into high, middle, and low bands, and
After transforming each band to the frequency axis by MDCT, highly efficient data compression is performed by organizing the data using the minimum audibility characteristic and masking effect based on psychoacoustics.

On the other hand, on the decoding device side, the decoding device of the first embodiment (FIG. 3) can be applied as a basic configuration, but the audio decoder 29 has a circuit configuration as shown in FIG. That is, on the PCM data side, the format-decomposed PCM data is transmitted to the SDDS decoder 10.
Input to 5 and original 8 channels by SDDS decoder 105
(L, LC, C, RC, R, SW, LS, RS) data, and decode data of each channel is converted into an analog reproduction signal by a D / A converter 106 provided separately and output. . On the 1-bit stream side, the 1-bit stream data subjected to format decomposition is separated into 8 channels by a channel separator 107, and converted into an analog reproduction signal by an individually provided LPF 108 and output.

A functional block diagram of the SDDS decoder 105 is shown in FIG.
The ATRAC decoder 110 performs a deformat process corresponding to the process of the format unit 104, returns the processed data to eight-channel decoded data, corrects the data by the equalizer filter 111, and performs D / D conversion corresponding to each channel. Output to the A converter 106. The ATRAC decoding unit 110 converts each data of the high band, the middle band, and the low band into the inverse MDC data.
Return to the time axis at T, pass the delay filter for the high band, combine the middle band and the low band in advance with the combining filter, and further combine the delayed high band data and the combined middle / low band data. The decoded time axis data is obtained by synthesizing with a synthesis filter.

[0075]

The "optical disc for audio and the encoding apparatus / decoding apparatus" of the present invention has the following effects due to the above configuration. Claim 1
The invention of PCM combines PCM data, which is pointed out inadequate due to limitations in reproduction bandwidth and S / N ratio, with 1-bit stream data, which is more excellent in the above characteristics, while conforming to the audio specifications of the DVD standard. Also, an audio optical disk capable of recording and selectively reproducing the both is realized, and the DVD system can be used as a high-quality audio reproduction system. According to a second aspect of the present invention, there is provided an encoding apparatus corresponding to the audio optical disc according to the first aspect of the present invention. According to a third aspect of the present invention, in the audio optical disc according to the first aspect of the present invention, the audio specification relating to the DVD-standard PCM data has a sampling frequency:
Since 48 kHz is adopted, the PCM data recorded together with the 1-bit stream data has the same sampling frequency, but this is fixed as the sampling frequency of the transmission system of the CD 44.1 kHz PCM data And CD
Of the transmission system. According to a fourth aspect of the present invention, there is provided an encoding apparatus corresponding to the audio optical disk according to the third aspect of the present invention. The invention according to claim 5 provides a decoding device corresponding to the audio optical disc according to claim 1 or 3. According to a sixth aspect of the present invention, there is provided an optical disk on which audio data of a Dolby surround system is recorded based on the data arrangement of the audio optical disk according to the first aspect of the invention. The inventions of claims 7 and 8 provide an encoding device and a decoding device corresponding to the audio optical disc of the invention of claim 6. According to the ninth and tenth aspects of the present invention, the multi-channel system (Dolby A
An optical disk on which audio data of the C-3 system / DTS system / SDDS system is recorded is realized. According to the eleventh and twelfth aspects of the present invention, there are provided an encoding apparatus and a decoding apparatus corresponding to the audio optical disc according to the ninth and tenth aspects.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of an encoding device according to a first embodiment and a second embodiment.

FIG. 2 is a diagram showing an allocation mode of PCM data and 1-bit stream data in a stream.

FIG. 3 shows a DV equipped with a decoding device according to a third embodiment.
It is a system circuit diagram of a D reproduction system.

FIG. 4 is a flowchart showing a procedure for selecting and setting a PCM playback mode or a 1-bit stream playback mode.

FIG. 5 is a flowchart illustrating an operation procedure when a PCM playback mode or a 1-bit stream playback mode is set.

FIG. 6 is a block circuit diagram of an encoding device according to a fourth embodiment in the case of a Dolby surround system.

FIG. 7 is a functional block diagram of a Dolby surround encoder.

FIG. 8 is a block circuit diagram of a decoding device according to a Dolby surround system.

FIG. 9 is a functional block diagram of a Dolby surround decoder.

FIG. 10 is a block circuit diagram of an encoding device according to a Dolby AC-3 system in a fourth embodiment.

FIG. 11 is a functional block diagram of a Dolby AC-3 encoder.

FIG. 12 is a block circuit diagram of a decoding device according to the Dolby AC-3 system.

FIG. 13 is a functional block diagram of a Dolby AC-3 decoder.

FIG. 14 is a functional block diagram of a DTS encoder applied to a case of a DTS method in a fourth embodiment.

FIG. 15 is a functional block diagram of a DTS decoder applied in the case of the DTS method.

FIG. 16 is a block circuit diagram of an encoding device according to an SDDS system in a fourth embodiment.

FIG. 17 is a functional block diagram of an SDDS encoder.

FIG. 18 is a block circuit diagram of a decoding device according to the SDDS method.

FIG. 19 is a functional block diagram of an SDDS decoder.

FIG. 20 is a diagram showing a basic pack configuration of the DVD standard.

FIG. 21 is a diagram showing a configuration of a video pack of the DVD standard.

FIG. 22 is a diagram illustrating a configuration of a DVD-standard audio pack.

FIG. 23 is a diagram showing the configuration of a DVD standard DSI pack and a VBI pack.

FIG. 24 is a diagram showing an A / D and D / A conversion system for various audio signals.

[Explanation of symbols]

1,24,6,47,51,63,81,98,108… LPF, 3,4,52,99… analog ΣΔ modulator, 5,6,54,56,69… data converter, 7,58,7
1,102 ... Formatter, 8 ... Modulator, 11 ... Reader,
12 ... Drive control circuit, 13 ... Demodulation circuit / error correction circuit, 1
4 track buffer, 15 write control circuit, 16 read control circuit, 17 system buffer, 18 VBV buffer, 19 subpicture buffer, 20 VBI buffer,
21: audio buffer, 22: DSI buffer, 23, 74,
90: Multiplexer, 24: Video decoder, 25: VBI
Decoder, 26 ... letterbox converter, 27 ... adder, 29
... Audio decoder, 30 ... Operation unit, 31 ... Display unit, 32 ...
System controller, 33 to 35 ... parameter storage, 36
... system timer, 41 ... format converter, 42, 43, 5
9,62,80,107 ... channel separator, 44,45,61,79,106 ... D
/ A converter, 53 ... Dolby surround encoder, 57,7
0,101: Digital filter, 60: Dolby surround decoder, 64: Attenuation circuit, 65: Processing circuit, 66: Control circuit,
67… VCA, 68… Dolby AC-3 encoder, 72,86
... Filter bank, 73 ... Quantizer, 75 ... Bit allocation unit, 76,85 ... Core bit allocation unit, 77 ... Encoding unit for spectrum envelope, 78 ... Dolby AC-3 decoder, 8
2,95: demultiplexer, 83: inverse quantizer, 84: spectrum envelope decoder, 87,97: 32 band decimation filter, 88: vector quantizer, 89: adaptive difference PCM (ADPCM) , 90: code compression section, 92: stream synthesis section, 93: stream decomposition section, 94: code expansion / reproduction section, 96: inverse ADPCM section, 100: SDDS encoder, 103: ATRAC encoding section, 104: format section, 105: SDDS decoder, 109 ... Deformat part,
110: ATRAC decoding unit; 111: Equalizer filter.

Claims (12)

[Claims] 1. A stream mode of an audio packet relating to an audio specification of PCM (Palse Code Modulation) data defined by a DVD (Digital Video Disc) standard.
(Number of channels: 1 to 8) [Number of channels: 10,
Sampling frequency: 48 kHz, the number of quantization bits: 16 bits / 20 bits], and two channels of the audio data portion in the audio packet formed based on the added stream mode are added to the left and right. Each analog audio signal of two channels is sampled at a sampling frequency of 48 kHz and a quantization bit number of 1
[6 bits / 20 bits] is recorded by the PCM method, and the above-described audio analog signals are modulated in the remaining 8 channels by the ビ ッ ト Δ modulation method by 1-bit quantization [transmission speed: 3]. 0.072 Mbps / 3.
840 Mbps], and identification data indicating that the audio data portion is in the additional stream mode is recorded in an audio data information portion (hereinafter, referred to as an “ADI portion”) in the packet. An optical disc for audio, comprising: 2. An encoding device for creating recording data of an audio optical disk according to claim 1, wherein each of the left and right two-channel analog audio signals is modulated by a ビ ッ ト Δ modulation method by 1-bit quantization. : 3.0
72 Mbps / 3.840 Mbps] 1-bit stream, and 1-bit stream data output from each of the above-mentioned modulators is sampled at a sampling frequency of 48 kHz and a quantization bit rate of 16 bits / 20 bits PCM. Each data conversion means for converting to data, and the output data of each data conversion means are allocated to two channels, and the output data of each modulation means are allocated to the remaining eight channels to form a stream of an audio data part. And encoding means for recording identification data in an ADI part in the packet and outputting the data. 3. The audio optical disc according to claim 1, wherein each of the left and right two-channel analog audio signals is [sampled frequency: 44.1 kHz, quantization bit number: 16] for two channels of an audio data part in an audio packet. Bits / 20 bits], and the data amount of the PCM data in the audio data portion is reduced to (44.1 / 48) by inserting a “0” bit, and An audio optical disc characterized by recording identification data and discrimination data indicating that a sampling frequency of PCM data of an audio data part is 44.1 kHz in an ADI part. 4. An encoding apparatus for creating recording data of an audio optical disk according to claim 3, wherein each of the left and right analog audio signals is modulated by a ビ ッ ト Δ modulation method by 1-bit quantization. : 3.0
72 Mbps / 3.840 Mbps] to obtain a 1-bit stream, and 1-bit stream data output from each of the above-mentioned modulating means to [sampling frequency: 44.1 kHz,
[Quantization bit number: 16 bits / 20 bits] Each data conversion means for converting to PCM data, and the output data of each data conversion means are allocated to two channels, and the output data of each modulation means is converted to the remaining data. The stream of the audio data part is configured by allocating the data to eight channels, and the amount of PCM data in the audio data part is reduced.
An encoding apparatus characterized in that the encoding apparatus further comprises formatting means for inserting a "0" bit for an amount reduced to (44.1 / 48) and recording and outputting identification data and discrimination data in an ADI unit. 5. A decoding device for decoding recording data of an audio optical disc according to claim 1 or 3, wherein said mode setting means selectively sets a PCM decoding mode and a 1-bit stream decoding mode. Confirmation means for confirming that the disc is the audio optical disc by detecting the read identification data of the ADI section, and each stream of the audio data section when the confirmation means confirms that the disc is the audio optical disc. Is disassembled, and the mode setting means
Format decomposing means for outputting only PCM data for two channels when the M decode mode is set, and outputting only one bit stream data for eight channels when the one bit stream mode is set; Means for separating the PCM data output by the means into two channels, left and right, a first channel separating means for forming PCM data for each of the separated channels, and a left and right channel data formed by the first channel separating means. A second D / A converter for individually performing D / A conversion, and a second bit stream data for separating the 1-bit stream data output from the format decomposing unit into two left and right channels and forming one bit stream data for each of the separated channels. The channel separation means and the second channel separation means are configured. Decoding apparatus characterized by comprising a respective low pass filter to filter left and right channel of the data. 6. A stream mode (number of channels: 1 to 8) of audio packets related to audio specifications of PCM data defined by the DVD standard [number of channels: 1
0, sampling frequency: 48 kHz, number of quantization bits: 16 bits / 20 bits], and two channels of the audio data portion in the audio packet configured based on the added stream mode are added. , Two-channel (Lt, Rt) data obtained by encoding a four-channel analog audio signal including the three front channels (L, C, R) and the rear channel (S) in a Dolby surround format [sampling frequency: 48 kHz]
z, quantization bit number: 16 bits / 20 bits] PCM
Data is recorded after conversion into data, and the above-described audio analog signals are modulated by the ΣΔ modulation method by 1-bit quantization for the remaining eight channels [transmission rate: 3.072].
[Mbps / 3.840Mbps]], the 1-bit stream data is band-compressed to 1/4 and recorded, and the ADI part in the packet is such that the audio data part is in the additional stream mode and the two channels are Dolby. An optical disc for audio, characterized by recording identification data indicating that the data is of a surround type. 7. An encoding apparatus for creating recording data of an audio optical disk according to claim 6, wherein the analog audio signal of four channels consisting of three front channels (L, C, R) and rear channel (S). Is modulated by a ビ ッ ト Δ modulation method using 1-bit quantization [transmission rate: 3.0
72 Mbps / 3.840 Mbps], and the four-channel one-bit stream data output from each of the above-mentioned modulators is encoded in a Dolby surround format to convert two-channel (Lt, Rt) data. Encoding means to obtain, and the data of two channels (Lt, Rt) obtained by the encoding means, [sample frequency:
48 kHz, number of quantization bits: 16 bits / 20 bits]
And a 1-bit stream output from each of the above-mentioned modulating means are converted into 1/2.
The band compression means for compressing the band and the output data of the data conversion means are allocated to two channels, and the output data of the band compression means are allocated to the remaining eight channels to form a stream of the audio data part. An encoding device comprising: a formatter configured to record identification data in an ADI section in a packet and output the identification data. 8. A decoding apparatus for decoding data recorded on an audio optical disc according to claim 6, wherein
Mode setting means for selectively setting a decoding mode and a 1-bit stream decoding mode; confirmation means for confirming that the disc is the audio optical disc by detecting identification data of an ADI portion read from the disc; Means for decomposing each stream of the audio data portion when it is confirmed that the optical disc is the audio optical disc, and when the PCM decoding mode is set by the mode setting means, the PCM for two channels is used.
Format decomposing means for outputting only data and outputting only one-bit stream data for eight channels when the one-bit stream mode is set by the mode setting means; and Dolby surround for outputting PCM data output by the format decomposing means. 2 channels of system
First channel separation means for separating the encoded data into (Lt, Rt) encoded data, and each encoded data separated by the first channel separation means into four channels (L, C, R, S) of the Dolby surround system. Decoding means for decoding to PCM data;
Each D / A conversion unit for individually D / A converting the decoded data of the channel, and the 1-bit stream data output by the format decomposing unit for four channels (L, C, R,
S), a second channel separating means for forming 1-bit stream data for each channel separately for each channel, and low-pass filters for filtering data of four channels formed by the second channel separating means. A decoding device characterized by the above-mentioned. 9. A stream mode (number of channels: 1 to 8) of audio packets related to audio specifications of PCM data defined by the DVD standard [number of channels: 1
0, sampling frequency: 48 kHz, number of quantization bits: 16 bits / 20 bits], and two channels of the audio data portion in the audio packet configured based on the added stream mode are added. The data obtained by encoding each analog audio signal of the multi-channel (N-channel) system by an encoding system corresponding to the system is referred to as [sampling frequency: 48 k
Hz, quantization bit number: 16 bits / 20 bits] PC
After converting to M data and recording, for the remaining 8 channels,
Each audio analog signal is obtained by modulating the audio analog signal by a 方式 Δ modulation method using 1-bit quantization [transmission rate: 3.07
[2 Mbps / 3.840 Mbps] 1-bit stream data is bandwidth-compressed to 2 / N and recorded, and the ADI portion in the packet is such that the audio data portion is in the additional stream mode and the data of the multi-channel system. An optical disc for audio, characterized by recording identification data indicating that 10. The multi-channel system is a Dolby A
The audio optical disk according to claim 9, wherein the optical disk is a C-3 system, a DTS (Digital Theater System) system, or an SDDS (Sony Dynamic Digital Sound) system. 11. An encoding apparatus for creating recording data of an audio optical disk according to claim 9 or 10, wherein each of the N-channel analog audio signals is modulated by a ΣΔ modulation method by 1-bit quantization. Each modulating means for obtaining a 1-bit stream of [transmission rate: 3.072 Mbps / 3.840 Mbps], and encoding N-channel 1-bit stream data output from each of the modulating means by an encoding method corresponding to a multi-channel method. Encoding means, data encoding means for converting the encoded data obtained by the encoding means into PCM data of [sampling frequency: 48 kHz, quantization bit number: 16 bits / 20 bits], and each of the modulation means Each band compression means for band-compressing the output of one bit stream to 2 / N, The output data of the conversion means 2
Channels, and the output data of each band compression means is allocated to the remaining eight channels to form a stream of the audio data part.
An encoding apparatus comprising: a formatter for recording and outputting identification data in an I section. 12. A decoding device for decoding data recorded on an audio optical disk according to claim 9 or 10, wherein a mode setting means for selectively setting a PCM decoding mode and a 1-bit stream decoding mode.
Confirmation means for confirming that the disc is the audio optical disc by detecting the identification data of the ADI section read from the disc; and Each stream is decomposed, and only PCM data for two channels is output when the PCM decoding mode is set by the mode setting means. When one bit stream mode is set by the mode setting means, data for eight channels is output. Format decoding means for outputting only 1-bit stream data, decoding means for decoding PCM data output by the format decoding means into N-channel decoded data by a decoding method corresponding to a multi-channel method, and the decoding means. N channel A second D / A converter for individually D / A converting code data; and a second bit stream data output from the format decomposer, which is separated into N channels to form one bit stream data for each channel. A decoding device comprising: channel separation means; and low-pass filters for filtering N-channel data formed by the second channel separation means.