JP2001345873A - Signal processor and transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly manage multi-channel audio data for each channel. SOLUTION: A disk player 100 of a transmitter and a recorder 200 of a receiver are connected via two serial interfaces 188-1 and 188-2 or the like of the IEEE1394 standard, a prescribed data stream is formed by containing an audio pack, for example, and in a prescribed area provided inside real data the data stream, channel information corresponding to the multi-channel audio contents composed of a PCM stored in the pack is stored as an identifier of audio contents, while being located adjacent to the audio contents, converted to a packet which corresponds to the serial interface of IEEE1394 standard and transmitted through the serial interface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DVD (Digital V)
ersatile Disc) A multiplexed data stream (Data Stream) such as audio is
serial interface).
et) a signal processing device and a transmission method.

[0002]

2. Description of the Related Art Conventionally, digital contents data (Digital Contents Data)
Is transmitted via a digital interface (in particular, also referred to as a serial interface). For example, JP-A-10-285234, JP-A-11-4551
As disclosed in Japanese Patent Publication No. 2
A PEG (Moving Picture Experts Group) transport stream is transmitted with a header added to each transport stream. If the above-mentioned content is divided and transmitted, there is a possibility that a packet may be lost. Therefore, it is necessary to process missing packets using the information of the header. By the way, in recent years, A-packs and RTIs (Real Time
Information) and a file having a multiplexed file structure of an audio file (Audio File) including an SPCT (still picture signal) pack and a DVD (video) file (DVD (Video) File) are required. It became so. Audio data stream having a multiplexed file structure in this way (Audio Data Stream)
In the case of transferring in accordance with IEEE 1394, it is particularly important to perform channel management so that the data can be transmitted so as to be accurately reproduced. Another problem is to make it possible to easily grasp channel information on a conventional digital interface. That is, it is an issue to be able to perform channel management of multi-channel audio contents in the conventional IEC958 standard. Accordingly, the present invention has been made in view of the above-described problems, and is intended to transmit, via a digital interface, a multiplexed content based on a DVD audio format, a DVD video format, or the like including an audio signal that has solved these problems. And a transmission method.

[0003]

Means for Solving the Problems The present invention comprises the following means 1) to 3) to solve the above problems. That is,

[0004] 1) When a packet is formed from data in which a predetermined data stream including an audio pack is originally formed, the P stored in the pack is stored in a predetermined area provided inside real data in the packet.
Packet information processing means for storing the channel information corresponding to the multi-channel audio content composed of CMs adjacent to the audio content as an identifier of the audio content and storing the channel information and packetizing the audio information in a format of a predetermined protocol; Signal processing device. 2) When a packet is formed from data in which a predetermined data stream including an audio pack is originally formed, a multi-layer consisting of PCMs stored in the pack is stored in a predetermined area provided inside real data in the packet. The channel information corresponding to the audio content of the channel is stored adjacent to the audio content as an identifier of the audio content, and the packetized data transmitted in a format of a predetermined protocol is received. A signal processing device comprising decoding means. 3) A predetermined data stream including an audio pack is originally formed, and when the data stream is converted into a packet corresponding to a serial interface of a predetermined standard, a predetermined area provided inside real data in the packet includes:
The channel information corresponding to the multi-channel audio content composed of PCM stored in the pack is stored adjacent to the audio content as an identifier of the audio content, and the packet corresponding to the serial interface of the predetermined standard is stored. And transmitting the data through a serial interface of the predetermined standard.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to preferred embodiments. FIG. 1 is a block diagram showing a first embodiment of a signal processing device and a transmission method according to the embodiment, and FIG. 2 is a flowchart showing processing of the disc player of FIG.

In the example shown in FIG. 1, a disc player 100 which is a transmitting device serving as a center of a home information network is used.
And the recording / reproducing device 200 as one receiving terminal device is a data transfer interface (I / F) 200a,
00b, and the data transfer I / Fs 200a and 200b are connected via two IEEE1394 standard serial interfaces 188-1 and 188-2. The disc player 100 reads, for example, an audio signal A and a still picture (still picture) signal SPCT recorded on a DVD audio disc, and transfers them to a data transfer I / F 200a and a serial interface 188-.
1 and 188-2 to the recording / reproducing device 200. The recording / reproducing apparatus 200 transmits the audio signal A and the still image signal SPCT to the serial interface 188-1,
188-2, Reception and reproduction via the data transfer I / F 200b. At this time, one serial interface 188-1 is selectively used for reception or transmission, and the other serial interface 188-2 is used exclusively for transmission.

Referring to FIG. 2, disc player 1 shown in FIG.
00 will be described. First, the data transfer I / F 200
a and one of the serial interfaces 188-1 are set to the reception mode (step S1).
/ F200a, two serial interfaces 188-
1 and 188-2 to perform bidirectional transmission with the recording / reproducing device 200 (step S2). Next, one of the serial interfaces 188-1 is set from the reception mode to the transmission mode (step S3), and the signal having a relatively high transfer rate is dispersed via the two serial interfaces 188-1 and 188-2. The data is transmitted to the playback device 200 (step S4). That is, in this example, the other serial interface 188-2 is always set to the transmission mode.

As a specific example of the transmission data, since a real-time information signal RTI (for example, text data) and a still picture signal SPCT are recorded on the DVD audio disc in addition to the audio signal A, the audio signal A is transmitted to the serial interface 188. -1 and the real-time information signal R
Serial interface 1 between TI and still image signal SPCT
A method of transmitting the data via 88-2 is conceivable. By dispersing in this manner, when the former audio signal A, the latter real-time information signal RTI, and the still picture signal SPCT are reproduced synchronously, it is possible to avoid the limitation of the buffer capacity. 99 pictures can be reproduced synchronously. Note that specific examples of communication performed in step S1 in which one is set to the reception mode are a designation (request) of a disc from a reproduction terminal and an operation instruction such as a play command.

The number of serial interfaces is not limited to two. For example, as shown in FIGS. 3 and 4, four serial interfaces 188-1 to 188-4 (and data transfer interfaces I / F 200a 'and 200b') are used. )
May be used. That is, first, one of the serial interfaces 188-1 to 188-4 is set to the reception mode (step S11), and then the recording / reproducing device 200 is connected via the two serial interfaces 188-1 and 188-2. Bi-directional transmission is performed between the first and second devices (step S1).
2). Next, the interface 188 of the reception mode described above.
-1 is set to the bidirectional mode (step S13), and then the three serial interfaces 188-2 to 188-
4 and transmits the signal having a relatively high transfer rate to the recording / reproducing apparatus 200 in a dispersed manner (step S14).

That is, in this case, for example, one serial interface 188-1 is selectively used for reception or transmission, and the other three serial interfaces 188-1 are used.
2-188-4 may be used exclusively for transmission. In this case, for example, the audio signal A, the real-time information signal RTI, and the still image signal SP
CT is connected to three serial interfaces 188-
2 through 188-4, and data relating to operation with the reproduction terminal is transmitted to one serial interface 188-1.
A method of mutual transmission via the Internet is conceivable.

In this embodiment, the present invention can be applied to an audio-compatible format of the IEC958 standard instead of the transmission system of the IEEE1394 standard. IEC958
The standard differs from the bidirectional transmission system like the IEEE 1394 standard of the present embodiment in that it is a transmission system in only one direction. In the case of bidirectional transmission using a plurality of serial interfaces as in the present embodiment, Is easy to apply. Further, the audio-compatible format of the IEC958 standard is the IEC9 standard in the IEEE1394 standard.
It may be a 58 mode audio compatible format, and can be applied to various modes of the IEEE 1394 standard.

Next, a billing flag and a zero flag (Zer) stored in a data field of FIG. 12 described later with reference to FIG.
o Flag), mute flag (Mute Flag), pack flag (B
ack Flag), copy flag (Copy Flag), and copy accompanying information (Down-sampling Flag) F
a, a down-mix flag Fb, a de-quantize flag Fc, and the number of copies). First, a flag is sent from the transmitting side to the receiving side as to whether or not the data compression scheme is the DVD audio lossless scheme. For example, this flag is
3 is a flag stored in the management information of the data field as shown in FIG. If the lossless scheme cannot be decoded, the reception can be stopped. Also, at the same time, the authentication data sent from the transmitting side to the receiving side is received, a response is made, and it is checked whether the receiving side is eligible to copy, and if the checking conditions are satisfied, the process is started. . The copy flag and the copy-related information indicating the process previously performed on the content on the transmission side are received. That is, if the process in which the sampling frequency Fs is converted to half is performed, the downmix flag F
b is set to “1” and the original bit (eg, 20
Bits) to 16 bits from de-quantiz
e) If the processing has been performed, the dequantize flag Fc is set to “1”, and the copy incidental information in which the number of copies is set is received. Also, look at the billing flags that indicate “paid” or “free” according to the type of content,
In the case of "pay", a charge is determined in accordance with the number of copies information, and charge management is performed to charge from an electronic wallet provided in the apparatus (step S21).

Next, when some of the plurality of serial interfaces are not used or the data is "0", a zero flag is transmitted from the transmitting side to the receiving side via the serial interface. Therefore, the reception side looks at this flag (step S22), and if Y, does not perform reception processing (step S23). Also, data other than the audio signal A, for example, the still image signal SPCT or the real-time information RTI is transmitted in a serial When transmitting via the interface, a mute flag is transmitted from the transmitting side to the receiving side via the serial interface so that no noise is generated by the D / A converter for the audio signal on the receiving side. Then, look at this flag (step S24), and if it is Y, mute processing is performed. Step S25).

The audio signal A, the still picture signal SPCT,
Real Time Information
on) When transmitting the RTI and the video signal V through a certain serial interface, the transmitting side transmits to the receiving side via the serial interface to the receiving side so that the receiving side can immediately decode it and synchronize. The flag for each signal type is transmitted, and the receiving side sees this flag and receives it (step S26).
And Y) ends. The transmission side counts up and rewrites the copy number information upon completion of the copy.

FIG. 6 shows a specific example of step S26. That is, the signal type flag indicates that the audio signal (D
Whether or not the pack flag is a video signal (video pack of a DVD audio disk) is determined by checking whether the pack flag is a video signal (a video pack of a DVD audio disk) (step S31). As a result (step S33), if it is Y, it is supplied to the V-pack buffer (step S34), and the pack flag
It is checked whether the signal is a signal (RTI pack of DVD audio disk) (step S35). If Y, the signal is supplied to the RTI pack buffer (step S36), and the pack flag is set to the SPCT signal (SPCT of DVD audio disk).
(Step S37), and if it is Y, it is supplied to the SPCT pack buffer (Step S38).
If it is other (management data), it is supplied to the decoder buffer (step S39).

The above-mentioned ID, management information, and flag information are stored in data of the following MPEG protocol and transmitted. FIG. 7 is a diagram for explaining an isochronous (Isochronous) transfer method of the IEEE 1394 standard for performing the transmission.
(A) shows a transport stream. The transport stream is a fixed packet of 188 bytes. Here, a bit string of audio data according to the DVD audio standard (A pack), image data and audio data according to the DVD video standard (A pack of video), etc. (V pack), or A bit string of audio data according to the SACD standard (Super Audio CD standard) is arranged.

FIGS. 8 to 11 show the data structures of the above-described A pack, V pack, RTI pack, and SPCT pack arranged here. Linear PC shown in FIG.
The A pack of M is recorded in the data area of the DVD audio disc. The PCM A-pack consists of 2048 bytes or less, of which 14
It is composed of a byte pack header and an A packet. The A packet has a packet header (Packet Header) of 17, 9 or 14 bytes and a private header (Private Header).
Header) and 1 to 2011 bytes of audio data (Audio Data).

The private header includes: an 8-bit substream ID; a 3-bit reserved area in UPC, EAN, and ISRC; and a 5-bit UPC / E in UPC, EAN, and ISRC.
AN / ISRC number; 8-bit UPC / E in UPC, EAN, ISRC
AN / ISRC data; 8 bits of private header length; 16 bits of first access unit pointer; 8 bytes of audio data information (ADI); and 0 to 7 stuffing bytes. Have been.

The ADI (audio data information section) includes: 1-bit audio emphasis flag; 1-bit reserved area; 1-bit stereo playback mode; 1-bit downmix code validity; A 4-bit downmix code; and a 4-bit quantization word length "1" of group "1".
And the quantization word length “2” of the 4-bit group “2”
4-bit audio sampling frequency fs1 of group "1"; 4-bit audio sampling frequency fs2 of group "2"; 4-bit reserved area; 4-bit multi-channel type; A 3-bit group "2" bit shift; 5-bit channel assignment information; 8-bit dynamic range control information; and a 16-bit reserved area.

FIG. 8B shows the structure of an A-pack of lossless-compressed packed PCM (Packed PCM). This pack is composed of 2048 bytes or less, and the breakdown is a 14-byte pack header. And A packet. The A packet includes a packet header of 17, 22, 9, 14, or 19 bytes, a private header, and 1 to 2015 bytes of compressed audio data. The private header includes: an 8-bit substream ID; a 3-bit reserved area in UPC, EAN, and ISRC; and a 5-bit UPC / E in UPC, EAN, and ISRC.
AN / ISRC number; 8-bit UPC / E in UPC, EAN, ISRC
AN / ISRC data; 8 bits of private header length; 16 bits of first access unit pointer; 4 bytes of audio data information (ADI); and 0 to 7 stuffing bytes. Have been. ADI (audio data information) is composed of: an 8-bit forward search pointer; an 8-bit backward search pointer; and a 16-bit reserved area.

The V pack shown in FIG. 9 is recorded in the data area of a DVD audio or DVD video disk. This V-pack is composed of 2048 bytes or less, and is composed of a 14-byte pack header and a user data packet. The pack header consists of a 4-byte pack start and a 6-byte SCR
MUX rate (multiplex transfer rate) of 3 bytes, 1
It consists of byte stuffing.

The RTI pack shown in FIG. 10 is recorded in the data area of a DVD audio disc. This RTI pack is composed of 2048 bytes or less, and is composed of a 14-byte pack header and an RTI packet. The RTI packet is 17,
It consists of a 9 or 14 byte packet header, an RTI private header, and 1 to 2015 bytes of RTI data.

The RTI private header includes: an 8-bit substream ID, a 2-byte reserved area, an 8-bit private header length, a 4-bit reserved area, and a 4-bit RTI information ID. , And a stuffing byte of 0 to 7 bytes.

The SPCT pack shown in FIG. 11 is recorded in the data area of a DVD audio disc. This SPCT pack is made up of 2048 bytes or less, which consists of a 14-byte pack header and SP
It is composed of CT packets. The SPCT packet includes a packet header of 22, 19, or 9 bytes and SPCT data of 1 to 2025 bytes.

Referring again to FIG. 7, the fixed packet of 188 bytes is prefixed with a time stamp called a source packet header [FIG.
(B)]. On the receiving side, audio and moving images are reproduced according to the time of the time stamp. Then, these data are divided into a plurality of data blocks each of 48 bytes [FIG. 7 (c)]. There are four division methods: 192 bytes × 1 block, 96 bytes × 2 blocks, 48 bytes × 4 blocks, and 24 bytes × 8 blocks.

Next, a plurality of data blocks are put together to form one isochronous transfer packet.
This grouping is performed with 125 μs as one cycle, sequentially grouped into a number of blocks that can be accommodated in each cycle, and an IEEE 1394 packet header described later is added to the head of the block. FIG. 7D shows a state in which data divided into 48-byte units are combined into three blocks and two blocks.

When performing this data transfer, as shown in FIG. 12, arbitration is added at the head, a cycle start packet is arranged following this, and a predetermined interval is added following this cycle start packet. Each time, packets of 125 μs are repeatedly arranged and transferred.

Each packet every 125 μs is composed of a packet header, a data field, and a 32-bit data error detection code. The packet header includes: 16-bit data length information; 2-bit CIP (Common Isochronous Pac described later)
ket) a tag indicating presence / absence of a header, channel assignment information for transmitting a 6-bit packet, and a transaction code indicating a 4-bit processing code.
(Transaction Code), 4 bits of synchronization code, and 32 bits of packet header error detection code.

The data field is a 32-bit CIP
It is composed of a header, a 32-bit real data header, real data, and a 32-bit real data tail. An 8-bit ID is composed of: a total number of 4-bit serial interfaces; and a 4-bit serial interface number. The 16-bit application information includes: a 4-bit pack flag; a 1-bit zero flag; a 1-bit mute flag; an 8-bit billing flag; and a 2-bit copy flag. .

The 8-bit copy accompanying information includes: 1-bit downsampling flag Fa; 1-bit downmix flag Fb; 1-bit dequantize flag Fc; and 5-bit copy count. Be composed.

The management information in the tail of the real data includes:
As shown in FIG. 13, one byte (8 bits) address 0
Information (16 bits) corresponding to addresses 0h to FFh (256 types) is sequentially recorded, and this is repeated. The addresses 00h to FFh are recorded in the ID (8 bits) in the tail of the real data. 00h to 07h; ISRC, 08h to 0Bh; UPC / EAN / JAN code, 0Ch; SDCM (copy management information), 0Dh to 2Fh; auxiliary information of encryption, 30h to 3Fh; use permission period, 40h; 41h to 46h; copyright protection period, 47h to 4Ah; information about players, 4Bh to 72h; text data, 73h to 7Fh; user ID, 80h; DVD audio lossless compression flag (packed PCM flag), 81h to BFh; Reservation area, C0h to C7h; disk management data, C8h to CEh; master tape management data, CFh to FFh; basic information of software production. In this way, a large amount of information at address 256 can be stored using the 16-bit area.

The AM824 data, which is multi-channel data stored in the real data, consists of 32 bits and has a head identifier (011) as shown in FIG.
, Channel code (5 bits), and PCM audio (24, 20, or 16 bits; however, 20 or 1)
In the case of 6 bits, LSB side is filled with zero).

As shown in FIG. 15, the channel codes are as follows: 0h: Lf: multi-channel left front 1h: Rf: multi-channel right front 2h: S: multi-channel surround 3h: Ls: multi-channel left surround 4h : Rs: Multi-channel write surround 5h: C: Multi-channel center 6h: LFE: Multi-channel Low Frequency Effect 7-1Fh: Hold

FIG. 16 shows an example of specific real data according to the above rules. Also, instead of putting the channel code information in the real data, 16-bit information may be put in the ID and reserve area in the tail in FIG. 12 as shown in FIG. The 16-bit information includes the group sampling frequency FS2 (4 bits), information indicating the type of multi-channel [frequency and number of bits (4 bits)], and information (5 bits) indicating channel assignment (assignment).
And 1-bit hold, 1-bit downsample flag (D
An own-sampling flag) and a 1-bit de-quantize flag (De-quantize Flag) may be composed of a 3-bit information section. FIG. 17 shows a modification of FIG. 13 in which a channel assignment (Channel Assig) is performed.
nment) is an example of channel information.

FIG. 18 shows details based on the channel assignment. The figure shows the group "1" from channel 1 (monaural) to channel 6,
The channel assignment information “2” is shown. In FIG. 1, Lf, Rf, S, Ls.
Each corresponding channel is represented in the same manner as 5 and L and R mean 2-channel stereo. In that case, the multi-channel data in the real data is, for example,
The channels are arranged as shown in FIG. 19, and the channels are arranged in the channel assignment (A) shown in FIG.
CH0 to ACH5). That is, a bit flag is stored instead of the 5-bit CH code in FIG. The upper two bits of the bit flag are used as bit information, for example, (00; 2
(4 bits), (01; 20 bits), (10; 16 bits), (11; other bits), and the lower two bits of the bit flag are used as downsampling information. For example, (010) indicates no downsampling, 011)
Is down-sampled. Downsampling means, for example, changing to a half sampling frequency.

FIG. 20 shows a specific embodiment of the disc player 100, in which a DVD audio disc and a D
1 shows a universal player capable of reproducing a VD video disc or the like. Control unit 1 for universal players
4, a DVD audio disk, a DVD video disk,
Data recorded on a disk 1 such as a DVD-RAM disk is reproduced by the drive device 2 and demodulated by the demodulation circuit 2B. DVD audio disc and D
VD video Video (V) played from a video disc
The still image pack reproduced from the DVD audio disk and the still image pack is converted to a DV by the still image / V-pack decoder 3.
It is D-decoded and converted to a video stream.

When the video stream is to be displayed on an external display (not shown) via the monitor output terminal 55 shown in FIG. Decompression and descrambling are performed, and then the V pack is output as a video signal / sub-picture signal / audio signal via the D / A conversion unit 5, and the still image SPCT pack is output as a video signal. On the other hand, the recording / reproducing device 2 shown in FIG.
There are two cases in which data is transferred to 00, and in the first method,
Data decompressed and descrambled by the decompression / image conversion unit 4 is data-arranged in a packed manner by the data arrangement unit 6, and then two data transfer I / Fs 7-1 and 7-
2 is transferred to the recording / reproducing apparatus 200 via the serial interface of IEEE1394 or IEC958. In the second method, the video stream without scrambling decoded (depacked) by the still image / V-pack decoder 3 is recorded / reproduced via the data transfer I / Fs 7-1 and 7-2 and the serial interface of IEEE1394 or IEC958. The data is transferred to the device 200.

Further, a DVD audio disc, a DVD
-The audio A pack and the RTI pack reproduced from the RAM disk are DVD-decoded by the A-pack / RTI pack decoder 8 and converted into a DVD audio stream. Converted to RTI.

When an audio signal is taken out through the output terminal 55 of FIG. 1 and supplied to an external speaker (not shown), this audio stream is converted by the PCM conversion / audio signal processing unit 9 into PCM conversion and descrambling. (De-scramble) and the like, converted into a PCM signal, and then output via the D / A converter 10. When the RTI is displayed on an external display (not shown), the output signal converted by the display signal generator 18 is supplied. On the other hand, there are two types of transfer to the recording / reproducing apparatus 200 of FIG. 1 as in the case of video. In the first method, the PCM conversion / audio signal
PCM data that has been converted and descrambled
The sampling frequency is changed to a lower value by the downsampling unit 10 if necessary, and the downmixing unit 1 is changed if necessary.
In the case of a multi-channel signal at 1, the signal is down-mixed into a two-channel stereo signal, data is arranged by the data arrangement unit 12, and then two data transfer I / Fs 13-
1, 13-2 and the serial interface of IEEE1394 or IEC958 to the recording / reproducing apparatus 200.

In the second method, a D signal that has been decoded by the A pack / RTI
VD audio stream is data transfer I / F13-
1, 13-2 and the serial interface of IEEE1394 or IEC958 to the recording / reproducing apparatus 200.

FIG. 21 shows another example of a recording / reproducing device 200 as a receiving device, which is shown as a device for reproducing data transferred by the universal player 100 shown in FIG. The transferred data is the data transfer I
/ F 21-1 and 21-2. The data transfer I / Fs 21-1 and 21-2 control the buffers 22V and A of the DVD decoder 22 by the control unit 32 based on the flag of the header transferred by the universal player 100.
Buffer 23V of pack reproducing section 23, V pack reproducing section 2
24, the RTI pack playback unit 25 has a buffer 25V, and the SPCT pack playback unit 26 has a buffer 2V.
Distribute to any of 6V.

That is, when the A-pack is identified by the 4-bit pack flag of the 32-bit application information of the real data header shown in FIG. In this case, the buffer 24 V of the V-pack reproducing unit 24 stores it in the buffer 24 V of the RTI pack reproducing unit 25.
The data is distributed to the buffers 26V of the CT pack reproducing unit 26, respectively. If the pack flag is not added,
It is supplied to the buffer 22V of the DVD decoder 22. The operation unit 33 is for performing operations such as play. The address 40 in the real data shown in FIG.
The content is identified by the content ID recorded in h, and the accounting process is performed. Also, the address 73h ~
The user ID recorded in 7Fh is used when supplied only to a specific user, and is used for collating the user.

When the data stored in the buffer 23V is set to the reproduction state by a user's instruction, the packed PCM (compression) flag is checked, and if the flag is set, decompression processing is performed. Therefore, it is not necessary to perform decompression processing after seeing all data by using this flag, and it is sufficient to look at the flag in advance, thereby improving the reproduction efficiency and reducing the buffer capacity. In addition, as described above, when the present apparatus is an apparatus that cannot perform decompression processing, the control unit 32 can stop data reception.

By providing a pack ID in the 32-bit header of the real data, the audio signal A, the still picture signal SPCT, the real-time information RTI,
When the video signal V is received, it can be immediately decoded on the receiving side, so that it is not necessary to take in a large amount of still image signals into the still image buffer in advance in order to synchronize the still image SPCT and the audio A, for example. The restriction on synchronous reproduction of a still image, which is limited by the buffer capacity, is reduced. In addition, video moving picture V (with sound) and audio A
Can be taken out at the same time and can be played back at the same time, eliminating the limitation of the playback that must be performed separately for each. In addition, a zero flag, a mute flag, a billing flag, and billing information (use permission period) are referred to. The charging flag and the charging information are processed by the charging management unit 34 together with the content ID. Copy management information SD
CM is not used in this case.

Further, in FIG. 21, the operation of the A-pack reproducing section 23 will be described in detail with reference to the flowchart of FIG. 22. A check is made as to whether "011" has been given (step S40). If yes (Y), this data is transferred to the later-described step as PCM audio data, and if no (N), this processing program is terminated (step S5).
2), processed as other channel audio data. If the data is multi-channel audio data, a CH (channel) code is found in step S41, and each CH code is stored in each of steps S42 and S42.
44, S46, S48, and S50, L
, Rf, Ls, Rs, and C are detected, and the data of each detected channel is stored in a corresponding one of the latch circuits 23a,.
(Steps S43, S45, S47, S4
9, S51), and are synchronized and output.

When frequency information corresponding to each channel is inserted as shown in FIG. 17, the down-sampling information shown in FIG.
As shown in FIG. 3, in step 61, frequency information corresponding to each channel is viewed, and in steps 80 to 84, the frequency is set to each channel. That is, in steps 80 to 84, the downsampling information is used to set the sampling frequency Fs to half when downsampling is performed.

Further, another operation will be described with reference to FIGS. 24 and 25 and FIGS. 1 and 20. First, the operation of the disc player 100 shown in FIG. 1 will be described. Data transfer I / F 200a and one serial interface 188
-1 is set to the reception mode (step S41), and it is checked whether or not there is a transmission request from the recording / reproducing device 200 (step S42). If there is, the transmission request is received (step S43), and the transmission is down as described later. The processing is set to sampling and dequantizing processing (step S44). In the case of multi-channel, the processing is set to downmix processing for downmixing (steps S45 and S46).

Then, the data transfer I / F 200
a, two serial interfaces 188-1, 188
The bidirectional transmission is performed with the recording device 200, which is the receiving device, via the -2 (step S47). Next, one serial interface 188-1 is set from the reception mode to the transmission mode (step S48), and then a signal having a relatively high transfer rate is dispersed via the two serial interfaces 188-1 and 188-2. The data is transmitted to the reproducing device, that is, the recording device 200 (step S49). That is, in this example, the other serial interface 188-
2 is always set to the transmission mode.

As a specific example of the transmission data, a real-time information signal RTI (for example, text data) and a still picture signal SPCT are recorded in addition to the audio signal A on the DVD audio disc. -1 and the real-time information signal RT
I and the still picture signal SPCT through the serial interface 18
A method of transmitting data via 8-2 is conceivable. By dispersing in this manner, the former audio signal A, the latter real-time information signal RTI, and the still picture signal SPCT can be transmitted at high speed. A specific example of communication performed in step S1 in which one is set to the reception mode is a designation (request) of a disc or a song from a reproduction terminal, a transmission supply instruction such as a play command, or the like.

As shown in FIG. 20, downsampling (D
The process of own-sampling is performed by the downsampling unit 10, and the process of dequantization is performed by the PCM conversion / audio signal processing unit 9. Also downmix
The processing of (Down-mix) is performed by the downmix unit 11.

Next, referring to FIG.
Flag and copy-related information (Down-sampling Flag F)
a, Down-mix Flag (Fb), De-quantize Flag (De-quantize Flag) Fc, number of copies), billing flag, zero flag (Zero Flag), mute flag (Mute Flag), and pack flag (Back Flag) ) Will be described. Further, the downmix flag and the dequantize flag may be obtained from the data shown in FIG. 17 described as another embodiment. First, the data transfer I / F 200b of FIG. 1 and one of the serial interfaces 188-1 are set to the transmission mode (step S).
51), a transmission request is made to the disc player 100 (step S52). Next, one serial interface 188-1 is set from the transmission mode to the reception mode (step S53), and then reception is performed via the two serial interfaces 188-1 and 188-2 (step S54). Next, the authentication data transmitted from the transmission side to the reception side is received, a response is made, and it is checked whether or not the reception side is qualified to copy, and the process is started when the check conditions are satisfied. Upon receiving the copy flag and copy supplementary information indicating the processing performed in advance on the transmission side, that is, if downsampling processing has been performed, the downmix flag Fb is set to “1” and the original bit (for example, , 20 bits) to 1
If the six bits have been subjected to the dequantizing process, the dequantizing flag Fc is set to "1", and the copy additional information in which the number of copies is set is received. Also, by looking at the charging flag indicating “paid” or “free” according to the type of content, in the case of “paid”, a charging fee is determined according to the number of times of copying information, and charging is performed from the electronic wallet. Perform (Step S55).

Next, when some of the serial interfaces are not used or the data is "0", the transmitting side transmits a zero flag to the receiving side via the serial interface. Therefore, the reception side looks at this flag (step S56), and if Y, does not perform reception processing (step S57). Also, data other than the audio signal A, for example, the still image signal SPCT and the real-time information RTI are transmitted in a serial When transmitting via the interface, a mute flag is transmitted from the transmitting side to the receiving side via the serial interface so that no noise is generated by the D / A converter for the audio signal on the receiving side. Then, look at this flag (step S58), and if it is Y, mute processing is performed. Step S59).

The audio signal A, the still picture signal SPCT,
Real-time information RTI, video signal V
When transmitting over a certain serial interface, a signal type flag is transmitted from the transmitting side to the receiving side via the serial interface so that the receiving side can immediately decode the signal and synchronize. The receiving side sees this flag and receives (step S60), and if it is finished (Y in step S61), it ends. The transmission side counts up and rewrites the copy number information upon completion of the copy.

A specific example of step 60 is the same as the step shown in FIG. That is, if the pack flag is an audio signal (A pack of DVD audio disc)
(Step S31), and if Y, supply it to the A pack buffer (step S32), and check whether the pack flag is a video signal (video pack of DVD audio disc) (step S33), and If there is, it is supplied to the V pack buffer (step S34), and it is checked whether the pack flag is an RTI signal (RTI pack of DVD audio disc) (step S35).
It is supplied to the TI pack buffer (step S36), and it is checked whether the pack flag is an SPCT signal (SPCT pack of DVD audio disk) (step S37), and Y
Is supplied to the SPCT pack buffer (step S
38) Otherwise, supply to the decoder buffer (step S39).

Although the above embodiment has been described on the assumption that the signal processing is performed based on the DVD audio standard, a combined apparatus capable of reproducing the encoding system and the 1-bit DSD encoding system will be described. For example, 1 bit D
In the case of the SD encoding method, the data structure is SDCD
(Super Audio CD)
Here, the data structure is almost the same as the structure shown in FIG. 8, and the description will be made assuming that the DSD encoded data is stored in the audio data area. At the time of transmission, the real data in FIG. 12 is arranged, for example, as shown in FIG. That is, the head identifier 3 bits (11
1: 1 bit DSD encoding system), 1 bit of encoding presence / absence flag indicating whether or not encoding is applied to the encoding, and 4 bits of channel and bit number flags (upper 2 bits are channel information. ,
For example, “00: 2CH”, “01: 3CH”, “1
0: 6CH "and" 11: other channels ", and the lower two bits are, for example,"00; 2 "as bit number information.
4 bits ","01; 20 bits ","10; 16 bits ","11; other bits ") and 1-bit audio data. The above encoding represents lossless compression such as Huffman coding.
At this time, a flag indicating the 1-bit DSD encoding method may be newly provided in the reserved area in the management information shown in FIG.

Referring to the flowchart of FIG. 27 as a reproduction operation corresponding to FIG. 6, if it is determined in step 31 that the signal identification flag is A-pack, then in step 32, the one-bit code It is detected whether or not there is a flag of the conversion scheme. If Y, the flag is supplied to the DSD buffer (step S33). If the flag is not found, the flag is supplied to the PCM buffer (step S34).

As a player for reproducing a disc of such an encoding system, for example, a player shown in FIG. 28 is provided. This player has a configuration corresponding to the above-mentioned FIG. 20, and in particular, is different in that a DSD / PCM conversion signal processing section 9 'is provided. Or PCM
The converted DSD data or PCM data is output.

FIG. 29 is a diagram corresponding to FIG. 21. In this case, in particular, the 4-bit pack flag of the 32-bit application information of the real data header shown in FIG. A-pack, and the 1-bit DSD is identified by the head identifier (111) shown in FIG.
A check is made as to whether the data is of the encoding system, and the DSD buffer 23V-1 of the A-pack reproducing unit 23 is accordingly checked.
Alternatively, the data is supplied to the PCM buffer 23V-2, and at the time of reproduction, the PCM-DSD conversion unit 28 is supplied via the A-pack reproduction unit 23.
a is output as a PCM signal or a DSD signal. In particular, when it is determined that the encoding method is the 1-bit DSD encoding method, the presence or absence of the encoding flag is checked as shown in the flowchart of FIG. 30 (step S15).
0), if yes, the PCM-DSD converter 28a decodes the lossless compression (step S16).
0), it is to be supplied to a D / A converter (not shown) (step S170).

In the embodiment described above, a plurality of interfaces are interfaces that can be connected, and a description has been given of a configuration in which a plurality of interfaces are connected in consideration of transferring a large amount of data at higher speed. If it is not desired to transfer data at high speed, one interface of the IEEE 1394 standard capable of bidirectional transfer may be used. In addition, the disc player is not limited to the optical disc, but may be a hard disc (HDD)
Or other recording media. Also, the recording / reproducing device is
It may be a mobile terminal.

[0060]

As described above, according to the present invention,
For example, when serially transmitting a content composed of a predetermined data story such as DVD audio, a multi-channel composed of PCMs stored in the pack is provided in a predetermined area provided inside real data in the data stream. The channel information corresponding to the audio content is stored adjacent to the audio content as an identifier of the audio content, converted into a packet corresponding to a serial interface of a predetermined standard, and transmitted through the serial interface of the predetermined standard. As a result, effects such as accurate channel management of audio channels and accurate multi-channel reproduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a transmission method and a signal processing device (transmitting device, receiving device) according to the present invention.

FIG. 2 is a flowchart showing a process of the disc player of FIG. 1;

FIG. 3 is a block diagram illustrating a transmission method and a signal processing device (a transmission device and a reception device) according to a second embodiment;

FIG. 4 is a flowchart showing processing of the disc player of FIG. 3;

FIG. 5 is a flowchart showing a process of the receiving device of FIGS. 1 and 3;

FIG. 6 is a detailed flowchart of FIG. 5;

FIG. 7 is a diagram for explaining an isochronous transfer system in the IEEE 1394 standard.

FIG. 8 shows a data structure of an A-pack of audio data according to the DVD audio standard.

FIG. 9 shows a data structure of data according to the DVD video standard.

FIG. 10 shows a data structure of an RTI pack according to the DVD audio standard.

FIG. 11 shows a data structure of an SPCT pack according to the DVD audio standard.

FIG. 12 is a detailed diagram of a data array at the time of transfer.

FIG. 13 is a detailed diagram of information stored in a management information area in a real data header.

FIG. 14 is a diagram showing an array format in real data.

FIG. 15 is a diagram showing a channel code.

FIG. 16 is a detailed diagram in real data.

FIG. 17 is another example of the channel information.

FIG. 18 is an example of a channel assignment.

FIG. 19 is another example in real data corresponding to FIG. 14;

FIG. 20 is a detailed block diagram of a player 100 in FIG. 1;

FIG. 21 is another embodiment of the recording / reproducing apparatus.

FIG. 22 is a flowchart showing another operation mode of FIG. 1;

FIG. 23 is an operation flow when information corresponding to FIG. 17 is stored.

FIG. 24 is an operation flow when a downsample flag or a downmix flag is obtained.

FIG. 25 is an operation flow when a zero flag or a mute flag is obtained.

FIG. 26 is a diagram corresponding to FIG. 20 when data of the 1-bit encoding method is arranged.

FIG. 27 is a diagram corresponding to FIG. 6 in the case of a 1-bit encoding method.

FIG. 28 is a block diagram of a dual-purpose player of the DVD audio system and the 1-bit encoding system.

FIG. 29 is a block diagram of a recording / reproducing apparatus on the receiving side corresponding to FIG. 22, which is of a type compatible with the DVD audio system and the 1-bit encoding system.

30 is a flowchart showing a decoding process of a 1-bit encoding signal in FIG. 29.

[Explanation of symbols]

Reference Signs List 100 Disc player (transmitting device) 200 Recording / reproducing device (receiving device) 188-1 to 188-4 Serial interface 7-1 to 7-2, 13-1 to 13-2, 200a, 20
0a 'Data transfer interface (transmission means) 21-1 to 21-2, 200b, 200b' Data transfer interface (reception means)

 ──────────────────────────────────────────────────続 き Continued on front page (31) Priority claim number Japanese Patent Application No. 2000-97413 (P2000-97413) (32) Priority date March 31, 2000 (2000.3.31) (33) Priority claim country Japan (JP) F term (reference) 5D044 AB05 AB08 BC03 BC04 CC06 DE12 DE14 DE49 DE50 DE83 EF03 EF05 FG10 FG18 HL11 5K028 AA15 EE03 EE08 KK32 MM08 5K034 CC05 EE11 HH63 MM25 MM37 MM39

Claims (3)

[Claims] When a packet is formed from data in which a predetermined data stream including an audio pack is originally formed, a PCM stored in the pack is stored in a predetermined area provided inside real data in the packet.
Packetizing means for storing the channel information corresponding to the multi-channel audio content, which is arranged adjacent to the audio content as an identifier of the audio content, and packetizing the audio information in a format of a predetermined protocol. Signal processing device. 2. A method for packetizing data from a data in which a predetermined data stream including an audio pack is originally formed is stored in a predetermined area provided inside real data in the packet.
The channel information corresponding to the multi-channel audio content consisting of, as an identifier of the audio content, stored adjacent to the audio content and stored and received data packetized and transmitted in a format of a predetermined protocol, at least A signal processing device comprising means for decoding the information. 3. A predetermined data stream including an audio pack is originally formed. When the data stream is converted into a packet corresponding to a serial interface of a predetermined standard, the packet is stored in a predetermined area provided inside real data in the packet. Storing the channel information corresponding to the multi-channel audio content composed of PCM stored in the pack adjacent to the audio content as an identifier of the audio content;
A transmission method, wherein a packet is converted into a packet corresponding to the serial interface of the predetermined standard and transmitted through the serial interface of the predetermined standard.