JP4086073B2 - Signal processing apparatus and transmission method - Google Patents

Description

The present invention relates to a multiplexed data stream such as a DVD (Digital Versatile Disc) audio and a serial interface.
The present invention relates to a packet signal processing apparatus and a transmission method for transmitting via a packet.

A technique for transmitting a data stream via a serial interface is known.
For example, what is disclosed in JP-A-10-190705 is known.
Incidentally, in recent years, it has been required to transmit a large amount of high-quality content data by high sampling, high bit, and multi-channel at high speed between devices.
And when transferring such high-quality data, copyright management has become an especially important issue (protecting copyright by not allowing unconditional copying is a problem. )
When copying is permitted, CD (compact disc)
It is also a problem to permit copying by converting to a normal sampling frequency (for example, 44.1 kHz or 48 kHz), the number of bits (for example, 16), and 2-channel stereo.
Therefore, in view of the above problems, the present invention provides a packet signal processing apparatus and a transmission method for transmitting an audio signal and the like that have solved these problems through a digital serial interface.

In order to solve the above-mentioned problems, the present invention comprises the following means 1) to 3).
That is,

1) The multi-channel PCM audio data stored in the audio pack is decoded from the data in which a predetermined data stream is formed including the audio pack to obtain real data, and the packet header, CIP header, and the real data are stored. When a packet is formed into a structure composed of areas to be processed, whether the actual number of bits of the decoded PCM audio data is 16 bits, 20 bits, or 24 bits is identified in a predetermined area in the packet Each channel audio data (32 bits) in which bit number identification information and a downsampling flag are arranged adjacent to the PCM audio data are arranged and stored in the order of channels of predetermined channel assignment information (channel assignment), and further stored in the packet of The constant regions, signal processing apparatus characterized by having a packet processing unit for packetizing the format of a predetermined protocol by receiving the channel assignment information.
2) Multi-channel PCM audio data stored in the audio pack is decoded from data in which a predetermined data stream including an audio pack is formed, to obtain real data, a packet header, a CIP header, and the When packetizing into a structure composed of areas containing real data, the actual bit number of the decoded PCM audio data is either 16 bits, 20 bits, or 24 bits in a predetermined area in the packet. Each of the channel audio data (32 bits) arranged adjacent to the PCM audio data is stored in the order of the channels of predetermined channel assignment information (channel assignment). Furthermore, in the packet The channel allocation information is stored in a predetermined area, data transmitted in a packetized format according to a predetermined protocol is received, and the actual bit number of the PCM audio data is 16 bits based on the bit number identification information. Means for identifying whether it is 20 bits or 24 bits;
Means for identifying a channel of each channel audio data based on the channel assignment information;
Means for decoding the flag;
A signal processing apparatus comprising:
3) Multi-channel PCM audio data stored in the audio pack is decoded from data in which a predetermined data stream including an audio pack is formed, to obtain real data, a packet header, a CIP header, and the When packetizing into a structure composed of areas containing real data, the actual bit number of the decoded PCM audio data is either 16 bits, 20 bits, or 24 bits in a predetermined area in the packet. Each of the channel audio data (32 bits) arranged adjacent to the PCM audio data is stored in the order of the channels of predetermined channel assignment information (channel assignment). Furthermore, in the packet The constant regions, transmission method is characterized in that so as to transmit by converting the packets corresponding to the serial interface of a predetermined standard and accommodating the channel assignment information through the serial interface of the predetermined standard.

As described above, according to the present invention, at least the downsampling flag, the downmix flag, or the quantize flag is stored in a predetermined area in the data stream. Copyright protection becomes easier.

Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 is a block diagram showing a first embodiment of a signal processing apparatus and transmission method according to the embodiment, and FIG. 2 is a flowchart showing processing of the disc player of FIG.

In the example of FIG. 1, a disc player 100 that is a transmitting device that plays a role in the home information network center and a recording / reproducing device 200 that is one receiving terminal device have data transfer interfaces (I / F) 200 a and 200 b, respectively. Data transfer I /
F200a and 200b are connected via two IEEE1394 standard serial interfaces 188-1 and 188-2. The disc player 100
For example, an audio signal A and a still picture (still picture) signal SPCT recorded on a DVD audio disk are read out, and these are read out as a data transfer I / F 200a.
Recording / reproducing apparatus 200 via serial interfaces 188-1 and 188-2
Send to. The recording / reproducing apparatus 200 uses the audio signal A and the still image signal SPCT.
Serial interface 188-1, 188-2, data transfer I / F 200b
To receive and play. At this time, one serial interface 188
-1 is selectively used for reception or transmission and the other serial interface 18
8-2 is used exclusively for transmission.

The operation of the disc player 100 of FIG. 1 will be described with reference to FIG. First, the data transfer I / F 200a and one serial interface 188-1 are set to the reception mode (step S1), and then recording is performed via the data transfer I / F 200a and the two serial interfaces 188-1 and 188-2. Bidirectional transmission is performed with the playback apparatus 200 (step S2).
Next, one serial interface 188-1 is set from the reception mode to the transmission mode (step S3), and then the two serial interfaces 188-1, 1
A signal having a relatively high transfer rate is distributed and transmitted to the playback device 200 via 88-2 (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, a DVD audio disc has an audio signal A.
In addition, since the real-time information signal RTI (for example, text data) and the still image signal SPCT are recorded, the audio signal A is transmitted via the serial interface 188-1, and the real-time information signal R
A method of transmitting the TI and the still image signal SPCT via the serial interface 188-2 can be considered. By dispersing in this way, when the former audio signal A, the latter real-time information signal RTI and the still picture signal SPCT are reproduced synchronously, the buffer capacity can be avoided, so that from a large number of still pictures, for example, 80 pictures. 99 sheets can be synchronously reproduced. A specific example of communication performed in step S1 in which one is set to the reception mode is a disk designation (request) from the playback terminal, an operation instruction such as a play command.

Note that 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 / Fs 200 a ′ and 200 b ′) are used. May be. That is, first, one of the serial interfaces 188-1 to 188-4 is set to the reception mode (step S11), and then the two serial interfaces 188-1 are set.
The bidirectional transmission is performed with the recording / reproducing apparatus 200 via 188-2 (step S12). Next, the interface 188-1 in the reception mode is set to the bidirectional mode (step S13), and then a signal having a relatively high transfer rate is distributed via the three serial interfaces 188-2 to 188-4. The data is transmitted to the recording / reproducing apparatus 200 (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 188-2-1 are used.
88-4 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 SPC
A method is conceivable in which T is transmitted via three serial interfaces 188-2 to 188-4, and data relating to operations with the playback terminal is mutually transmitted via a single serial interface 188-1.

The present embodiment can also be applied to an audio compatible format of the IEC 958 standard instead of the transmission method of the IEEE 1394 standard.
Unlike the IEEE 1394 standard of this embodiment, the IEC 958 standard is a one-way transmission system, unlike the IEEE 1394 standard, and in the case of bi-directional transmission using a plurality of serial interfaces as in this embodiment. It is easy to apply.
Further, the audio compatible format of the IEC958 standard is IEEE13.
It may be an IEC958 mode audio compatible format in the 94 standard, and can be applied to various modes in the IEEE 1394 standard.

Next, a billing flag, a zero flag, a mute flag, a pack flag (Back Fl) stored in a data field of FIG.
ag), copy flag (Copy Flag) and copy supplementary information (downsampling flag)
(Down-sampling Flag) Fa, Down-mix Flag Fb, De-quantize Flag Fc, number of copies) will be described. First,
A flag indicating whether the data compression method is a DVD audio lossless method is sent from the transmission side to the reception side. For example, this flag is a flag stored in the management information of the data field as shown in FIG. If this lossless method cannot be decoded, reception can be stopped. At the same time, the authentication data sent from the transmission side to the reception side is received, a response is made, and whether or not the reception side is qualified to make a copy is checked. If the check condition is satisfied, the process starts. . The copy flag and the copy supplementary information indicating the processing performed on the content in advance on the transmission side are received. That is, if the processing in which the sampling frequency Fs is converted to half is performed, the downmix flag Fb is set to “1”. And
De-quan from original bits (eg 20 bits) to 16 bits
If the (tize) process has been performed, the dequantize flag Fc is set to “1”, and the copy supplementary information in which the number of copies is set is received. Also, by looking at the charge flag indicating “pay” or “free” according to the type of content, if it is “pay”, the charge fee is determined according to the copy count information, and the electronic wallet provided in the device Charge management for charging is performed (step S21).

Next, if some of the multiple 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. See this flag on the side (step S2
2) If Y, reception processing is not performed (step S23), and when data other than the audio signal A, for example, still image signal SPCT or real-time information RTI is transmitted via a serial interface, the reception side A mute flag is transmitted from the transmission side to the reception side via the serial interface so that noise is not generated by the D / A converter for the audio signal, and the reception side sees this flag (step S24). If so, mute processing is performed (step S25).

Audio signal A, still image signal SPCT, real-time information (Rea
l Time Information) When transmitting RTI and video signal V through a certain serial interface, the serial interface is connected from the transmitting side to the receiving side so that it can be easily decoded and synchronized on the receiving side. The signal type flag is transmitted via the reception side, and the reception side sees and receives the flag (step S26).
If completed (Y in step S27), the process ends. On the transmission side, the copy count information is counted up and rewritten upon completion of the copy.

FIG. 6 shows a specific example of step S26. That is, it is checked whether the signal type flag is an audio signal (A pack of DVD audio disc) (step S31). If Y, the signal is supplied to the A pack buffer (step S32), and the pack flag is a video signal (DVD). If it is Y, it is supplied to the V pack buffer (step S34).
), It is checked whether the pack flag is an RTI signal (DVD audio disk RTI pack) (step S35). If it is Y, the pack flag is supplied to the RTI pack buffer (step S35).
In step S36), whether the pack flag is an SPCT signal (SPCT pack of a DVD audio disk) is checked (step S37). If Y, the pack flag is supplied to the SPCT pack buffer (step S38). The data is supplied to the decoder buffer (step S39).

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

8 to 11 show data structures of the A pack, V pack, RTI pack, and SPCT pack described above. The A pack of the linear PCM shown in FIG. 8A is recorded in the data area of the DVD audio disk.
The PCM A pack is composed of 2048 bytes or less, and the breakdown is composed of a 14-byte pack header and an A packet. A packet is 17, 9
Or 14-byte packet header (Packet Header) and private header (Priv
ate Header) and 1 to 2011 bytes of audio data (Audio Data).

Private header
An 8-bit substream ID;
A 3-bit reserved area in UPC, EAN, ISRC, and
-5-bit UPC / EAN / ISRC number in UPC, EAN, ISRC,
-8-bit UPC / EAN / ISRC data in UPC, EAN, ISRC,
-8-bit private header length,
A 16-bit first access unit pointer;
8 bytes of audio data information (ADI)
・ 0-7 bytes of stuffing bytes,
It is comprised by.

ADI (Audio Data Information Unit)
1-bit audio emphasis flag,
A 1-bit reserved area;
-1-bit stereo playback mode,
1-bit downmix code validity,
-4-bit downmix code,
A quantization word length “1” of a 4-bit group “1”;
A quantization word length “2” of a 4-bit group “2”;
A 4-bit group “1” audio sampling frequency fs1,
A 4-bit group “2” audio sampling frequency fs2,
A 4-bit reserved area;
・ 4-bit multi-channel type
-A bit shift of the group "2" of 3 bits,
-5-bit channel assignment information,
・ 8-bit dynamic range control information,
A 16-bit reserved area;
It is comprised by.

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

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

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

The RTI private header is
An 8-bit substream ID;
A 2-byte reserved area;
-8-bit private header length,
A 4-bit reserved area;
A 4-bit RTI information ID;
・ 0-7 bytes of stuffing bytes,
It is comprised by.

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

Again, in FIG. 7, the above-mentioned fixed packet consisting of 188 bytes is prefixed with a time stamp called a source packet header [FIG. 7 (b).
]]. On the receiving side, audio and moving images are reproduced in accordance with the time of the time stamp.
These data are divided into a plurality of data blocks each having 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 combined to form one isochronous transfer packet. This way of summarizing, with 125 μs as one cycle,
The blocks are sequentially collected into a number of blocks that can be accommodated in each cycle, and a packet header for IEEE 1394 described later is added to the head of the block. FIG. 7D shows a state in which data divided into 48 bytes is grouped into 3 blocks and 2 blocks.

Then, when performing this data transfer, as shown in FIG. 12, arbitration is added to the head, followed by a cycle start packet, and further, after this cycle start packet, 125 at predetermined intervals. μs packets are repeatedly arranged and transferred.

The packet every 125 μs includes a packet header, a data field,
It consists of a 32-bit data error detection code.
The packet header is
・ 16-bit data length information,
A tag indicating the presence or absence of a 2-bit CIP (Common Isochronous Packet) header,
-Channel assignment information for transmitting 6-bit packets;
・ Transaction code indicating 4-bit processing code,
A 4-bit sync code,
A 32-bit packet header error detection code;
Consists of.

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

8-bit copy supplementary information
A 1-bit downsampling flag Fa;
A 1-bit downmix flag Fb;
1-bit quantize flag Fc,
・ 5-bit copy count,
Consists of.

As shown in FIG. 13, the management information in the tail of the real data includes information corresponding to 1 byte (8 bits) address 00h to address FFh (256 types) (1
6 bits) are recorded in order, and this is repeated. This address 0
0h to FFh are recorded in the ID (8 bits) in the tail of the real data.
That is,
00h-07h; ISRC,
08h to 0Bh; UPC / EAN / JAN code,
0Ch; SDCM (copy management information),
0Dh to 2Fh; attached information of encryption,
30h-3Fh; use permission period,
40h; Content ID,
41h-46h; copyright protection period,
47h-4Ah; information about the player,
4Bh-72h; text data,
73h-7Fh; user ID,
80h; DVD audio lossless compression flag (packed PCM flag),
81h to BFh; reserved area,
C0h to C7h; disk management data,
C8h to CEh; master tape management data,
CFh to FFh; Basic information on software production,
Consists of. In this way, a large number of information at address 256 can be stored using a 16-bit area.

In addition, as shown in FIG. 14, AM824 data, which is multi-channel data stored in real data, consists of 32 bits and includes a head identifier (011),
It consists of a channel code (5 bits) and PCM audio (24, 20, or 16 bits; however, in the case of 20, or 16 bits, zeros are padded on the LSB side).

The channel code is as shown in FIG.
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 right surround 5h: C: Multi-channel Center 6h: LFE: Multi-channel Low Frequency Effect
7-1Fh: Defined by hold.

FIG. 16 is an example of specific real data according to the above-mentioned definition.
Further, instead of putting the channel code information in the real data, as shown in FIG. 17, 16-bit information is converted into I in the tail in FIG.
You may make it enter into D and a reserve area | region.
This 16-bit information is
Group sampling frequency FS2 (4 bits),
Information indicating the type of multi-channel [frequency and number of bits (4 bits)],
Information indicating channel assignment (allocation) (5 bits), 1-bit hold, 1-bit down-sampling flag, and 1-bit de-quantize flag, 3 bits in total The information department;
You may make it comprise from these.
FIG. 17 is a modified example of FIG. 13 and shows a channel assignment (Channel Assig).
nment) is an example of channel information.

FIG. 18 shows details based on the channel assignment.
The figure shows groups “1”, “1” (mono) to 6 channels “
2 "shows the channel assignment information. Lf, Rf, S, L in the figure
Each symbol of s... represents the corresponding channel as in FIG. 15, and L and R mean two-channel stereo.
In this case, the multi-channel data in the real data is arranged as shown in FIG. 19, for example, and each channel is determined by the channel assignment in FIG. 17 and the channel order (ACH0 to ACH5) in FIG. It has become so. That is, a bit flag is stored instead of the 5-bit CH code in FIG. The upper 2 bits of the bit flag are, for example, (00; 24 bits), (01; 20 bits), (10; 16 bits),
(11: other bits), and the lower 2 bits of the bit flag are represented as downsampling information, for example, (010) indicates no downsampling and (011) indicates downsampling. Downsampling means changing to a sampling frequency of 1/2, for example.

Next, FIG. 20 shows a specific embodiment of the disc player 100, and shows a universal player capable of reproducing a DVD audio disc and a DVD video disc. In the universal player, data recorded on the disc 1 such as a DVD audio disc, a DVD video disc, a DVD-RAM disc, etc. is reproduced by the drive device 2 based on the control of the control unit 14 and the operation of the operation unit 15 and the remote control 16. Demodulated by the demodulating circuit 2B. Video (V) packs and DVDs played from DVD audio discs and DVD video video discs
The still picture pack reproduced from the audio disc is DVD-decoded by the still picture / V pack decoder 3 and converted into a video stream.

When the video stream is displayed on an external display (not shown) via the monitor output terminal 55 shown in FIG. 1 or taken out as an audio output, the video stream is decompressed and decompressed by the decompression / image conversion unit 4. Scrambled, then D
The V pack is output as a video signal / sub-picture signal / audio signal via the / A converter 5, and the still image SPCT pack is output as a video signal.
On the other hand, when the data is transferred to the recording / reproducing apparatus 200 shown in FIG. 1, there are two methods. In the first method, data decompressed and descrambled by the decompressing / image converting unit 4 is packed by the data arranging unit 6 in a packed manner. The data is arranged and then two data transfer I / s
The data is transferred to the recording / reproducing apparatus 200 via the F7-1, 7-2 and IEEE1394 or IEC958 serial interface. In the second method, the unscrambled video stream decoded (depacked) by the still image / V pack decoder 3 is transferred to the data transfer I / Fs 7-1 and 7-2 and IEEE1394 or IEC.
The data is transferred to the recording / reproducing apparatus 200 via a 958 serial interface.

The audio A pack and the RTI pack reproduced from the DVD audio disk and the DVD-RAM disk are DVD-decoded by the A pack / RTI pack decoder 8 and converted into a DVD audio stream. To character information / real-time text information RTI.

When the audio signal is taken out via the output terminal 55 of FIG. 1 and supplied to an external speaker (not shown), the audio stream is converted by the PCM conversion / audio signal processing unit 9 into PCM conversion and descrambling (De- scramble) is converted into a PCM signal, and then output via the D / A converter 10. Also,
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, when transferring to the recording / reproducing apparatus 200 of FIG. 1, there are two types as in the case of video. In the first method, PCM conversion /
If the PCM data subjected to PCM conversion and descrambling by the audio signal processing unit 9 is changed to a lower sampling frequency by the downsampling unit 10 as necessary, and 2 if the downmixing unit 11 is a multi-channel signal. Down-mixed into a channel stereo signal, data arrayed by the data array unit 12, and then two data transfer I / Fs 13-1, 13-2 and IEEE1394
Alternatively, the data is transferred to the recording / reproducing apparatus 200 via a serial interface of IEC958.

In the second method, the DVD audio stream which is decoded by the A pack / RTI pack decoder 8 and is not scrambled is the data transfer I / F 13-1, 1
The data is transferred to the recording / reproducing apparatus 200 via the serial interface of 3-2 and IEEE1394 or IEC958.

FIG. 21 shows another example of the recording / reproducing apparatus 200 as a receiving apparatus, which is an apparatus that reproduces data transferred by the universal player 100 shown in FIG. 20, and is transferred by the universal player 100 via a serial interface. Data is received via the data transfer I / Fs 21-1 and 21-2. The data transfer I / Fs 21-1 and 21-2 are controlled by the control unit 32 based on the header flag transferred by the universal player 100 and the buffer 2 of the DVD decoder 22.
2V, buffer 23V of A pack playback unit 23, buffer 2 of V pack playback unit 24
4V, buffer 25V of RTI pack playback unit 25, and SPCT pack playback unit 2
Distribute to one of the six buffers 26V.

That is, when it is identified as A pack by the 4-bit pack flag of the above-described real data header 32-bit application information shown in FIG. 12, when it is identified as V pack in the buffer 23V of the A pack playback unit 23, When the RTI pack is identified in the buffer 24V of the V pack reproducing unit 24, the SPCT pack reproducing unit 26 is identified in the buffer 25V of the RTI pack reproducing unit 25 when the SPCT pack is identified.
Distributed to each buffer 26V. If no pack flag is added, it is supplied to the buffer 22V of the DVD decoder 22. The operation unit 33 is for performing operations such as play. Further, the charging process is performed by identifying the content by the content ID recorded at the address 40h in the real data shown in FIG.
The user IDs recorded in the addresses 73h to 7Fh are used when supplied only to a specific user, and are used for collating the users.

When the data stored in the buffer 23V is brought into a reproduction state according to a user instruction, the packed PCM (compression) flag is looked at. If the flag is on, decompression processing is performed. Therefore, it is not necessary to perform decompression processing after viewing all data with this flag, and it is sufficient to view the flag in advance, so that the reproduction efficiency is improved and the buffer capacity is reduced.
In addition, as described above, when the present apparatus is an apparatus that cannot perform the decompression process, the control unit 32 can stop receiving data.

Also, by providing a pack ID in the 32-bit header of the real data, when receiving the audio signal A, the still image signal SPCT, the real-time information RTI, and the video signal V, it can be immediately decoded on the receiving side.
For example, in order to synchronize the still image SPCT and the sound A, it is not necessary to capture a large amount of still image signals in the still image buffer in advance, and the restriction on the synchronous reproduction of the still image, which is limited by the conventional buffer capacity, is reduced. In addition, the video moving image V (with sound) and the audio A can be taken out simultaneously and played back simultaneously, thereby eliminating the restriction on playback that must be played back separately.
Also, the zero flag, mute flag, billing flag, and billing information (use permission period) are referred to. The billing flag and billing information are processed by the billing management unit 34 together with the content ID. In this case, the copy management information SDCM is not used.

Furthermore, in FIG. 21, the operation in the A pack reproducing unit 23 will be described in detail with reference to the flowchart of FIG. 22. In this A pack reproducing unit 23, “011” is added to the first 3 bits of the incoming data. Is checked (step S40). If yes (Y), this data proceeds to the steps described later as PCM audio data, and if no (N), the processing program is terminated (step S52), and the other channel audio data is assumed. It is processed.
If it is multi-channel audio data, CH (
Channel) code, and each CH code has its own step S42, S4.
4, S46, S48, and S50, the channels that are Lf, Rf, Ls, Rs, and C are detected, respectively, and the data of the detected channels is the corresponding latch circuit 23a in the A pack reproducing unit 23, respectively. ,... Are latched (steps S43, S45, S47, S49, S51), and are output in synchronization.

Further, when the frequency information corresponding to each channel is entered as shown in FIG. 17 described above, the channel corresponds to each channel at step 61 as shown in FIG. 23 with reference to the downsampling information shown in FIG. To see the frequency information
Steps 80 to 84 are set to frequencies corresponding to the respective channels. That is, in steps 80 to 84, the sampling frequency Fs is set to half when down-sampling is performed according to the down-sampling information.

Further, another operation will be described with reference to FIGS. 24, 25 and FIGS. First, the operation of the disc player 100 of FIG. 1 will be described. Data transfer I /
F200a and one of the serial interfaces 188-1 are set to the reception mode (step S41), and whether there is a transmission request from the recording / reproducing apparatus 200 (step S42), and if there is, the transmission request is received (step S43). ), Set to downsampling and dequantization processing as described later (step S44),
In the case of multi-channel, in order to downmix, it is set to a downmix process (steps S45 and S46).

Next, the data transfer I / F 200a, two serial interfaces 1
Bidirectional transmission is performed with the recording apparatus 200 which is a receiving apparatus via 88-1 and 188-2 (step S47).
Next, one serial interface 188-1 is set from the reception mode to the transmission mode (step S48), and then the two serial interfaces 188-1,
Via 188-2, a signal having a relatively high transfer rate is distributed and transmitted to the reproducing apparatus, that is, the recording apparatus 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 DVD audio disc has an audio signal A.
In addition, since a real-time information signal RTI (for example, text data) and a still image signal SPCT are recorded, the audio signal A is transmitted via the serial interface 188-1, and the real-time information signal RT
A method of transmitting I and the still image signal SPCT via the serial interface 188-2 is conceivable. By dispersing in this way, 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 of them is set to the reception mode is a transmission supply instruction such as a disk or song designation (request) or a play command from the playback terminal.

As shown in FIG. 20, down-sampling processing is performed by the down-sampling unit 10, and de-quantization processing is performed by the PCM conversion / audio signal processing unit 9.
In addition, the down-mix process is performed by the down-mix unit 11.

Next, using FIG. 25, a copy flag (Copy Flag) in the recording / reproducing apparatus 200,
Copy supplementary information (Down-sampling Flag Fa, Down-mix Flag Fb, De-quantize Flag)
Fc, number of copies), billing flag, zero flag (Zero Flag), mute flag (Mu
te 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 given as another embodiment.
First, the data transfer I / F 200b of FIG. 1 and one serial interface 1
88-1 is set to the transmission mode (step S51), and a transmission request is sent 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 received via the two serial interfaces 188-1 and 188-2 (step S54). Next, the authentication data sent from the transmission side to the reception side is received, a response is made, and whether or not the reception side is qualified to make a copy is checked. If the check condition is satisfied, the process starts. When the copy flag and the copy supplementary information indicating the processing applied in advance on the transmission side are received, that is, when the down sample processing is performed, the down mix flag Fb is set to “1” and the original bit (for example, , 20 bits) to 16 bits, the dequantization flag Fc is set to “1”, and the copy supplementary information in which the number of copies is set is received. Also, look at the billing flag indicating “pay” or “free” according to the type of content. If it is “pay”, the billing fee is determined according to the copy count information, and billing management is performed to charge from the electronic wallet. This is performed (step S55).

Next, if some of the multiple 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. See this flag on the side (step S5
6) If Y, the reception process is not performed (step S57). When data other than the audio signal A, for example, the still image signal SPCT or the real-time information RTI is transmitted via a certain serial interface, the reception side A mute flag is transmitted from the transmission side to the reception side via the serial interface so that noise is not generated by the D / A converter for the audio signal, and the reception side sees this flag (step S58). If so, mute processing is performed (step S59).

In addition, when the audio signal A, the still image signal SPCT, the real-time information RTI, and the video signal V are transmitted via a serial interface, the transmission side can easily decode and synchronize them on the reception side. Send a signal type flag to the receiving side via the serial interface,
The receiving side sees this flag and receives it (step S60), and if it is finished (Y in step S61), it ends. On the transmission side, the copy count information is counted up and rewritten upon completion of the copy.

A specific example of step 60 is the same as the step shown in FIG. That is,
Whether the pack flag is an audio signal (A pack of a DVD audio disk) is checked (step S31), and if it is Y, it is supplied to the A pack buffer (step S).
32) Whether the pack flag is a video signal (video pack of a DVD audio disk) is checked (step S33). If it is Y, the pack flag is supplied to the V pack buffer (step S34), and the pack flag is an RTI signal (DVD audio disk). RT
If it is Y, it is supplied to the RTI pack buffer (step S36), and it is checked whether the pack flag is an SPCT signal (SPCT pack of a DVD audio disk) (step S37). , Y if SP
The data is supplied to the CT pack buffer (step S38), and otherwise supplied to the decoder buffer (step S39).

In the above-described embodiment, the signal processing processed based on the DVD audio standard has been described. However, a dual-purpose device capable of reproducing this encoding method and the 1-bit DSD encoding method will be described.
For example, in the case of a 1-bit DSD encoding method, the data structure may be that of an SDCD (Super Audio CD), but here the data structure is
Explanation will be made assuming that the structure is almost the same as that shown in FIG. 8 and that the DSD encoded data is stored in the audio data area. Further, during transmission, the real data in FIG. 12 is arranged as shown in FIG. 26, for example.
That is,
3 bits of head identifier (indicating 111: 1 bit DSD encoding method),
1 bit of encoding presence / absence flag indicating whether or not encoding is given to the encoding,
Channel and bit number flag 4 bits (the upper 2 bits are channel information such as “00: 2CH”, “01: 3CH”, “10: 6CH”,
“11: Other channel”, and the lower 2 bits are, for example, “00; 24 bits”, “01; 20 bits”, “10; 16 bits”, “
11; other bits ") and 1-bit audio data.
The above encoding represents lossless compression, such as a Huffman code.
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.

Then, as a reproduction operation corresponding to the above-described FIG. 6, if described in the flowchart of FIG. 27, if it is determined in step 31 that the signal identification flag is A pack, in step 32, the 1-bit encoding method is used. It is detected whether or not there is a flag. If it is Y, it is supplied to the DSD buffer (step S33). If the flag is not found, it is supplied to the PCM buffer (step S34).

In addition, as a player for reproducing a disc of such an encoding method, for example,
The player shown in FIG. 28 is provided. This player has a configuration corresponding to FIG. 20, except that a DSD / PCM conversion signal processing unit 9 'is provided. The DSD conversion is performed according to the presence or absence of the flag of the 1-bit DSD encoding method. Or PC
MSD converted DSD data or PCM data is output.

Furthermore, FIG. 29 is a diagram corresponding to FIG. 21, and in this case, in particular, in this case, the A-pack is indicated by the 4-bit pack flag of the above-described real data header 32-bit application information shown in FIG. 12. Identify and check whether the data is the data of the 1-bit DSD encoding method by the head identifier (111) shown in FIG.
Accordingly, the data is supplied to the DSD buffer 23V-1 or the PCM buffer 23V-2 of the A pack playback unit 23, and the PCM-D is passed through the A pack playback unit 23 during playback.
The SD conversion unit 28a outputs the signal as a PCM signal or a DSD signal.
In particular, if it is determined that the encoding method is a 1-bit DSD encoding method, the presence / absence of an encoding flag is checked as shown in the flowchart of FIG. 30 (step S150). In 28a, lossless compression is decoded (step S160) and supplied to a D / A converter (not shown) (step S170).

In the embodiment described above, the interface is an interface that can be connected to a plurality of interfaces, and has been described with a configuration in which a plurality of interfaces are connected in consideration of transferring a large amount of data at a higher speed. If transfer is not desired, one IEEE 1394 standard interface capable of bidirectional transfer may be used.
Further, the disc player is not limited to the optical disc, and may be a recording medium such as a hard disk (HDD).
Further, the recording / reproducing apparatus may be a portable terminal.

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. 3 is a flowchart showing processing of the disc player in FIG. 1. It is a block diagram which shows the transmission method of 2nd Embodiment, and a signal processing apparatus (transmission apparatus, reception apparatus). 4 is a flowchart showing processing of the disc player of FIG. 3. It is a flowchart which shows the process of the receiver of FIG. 1, FIG. It is a detailed flowchart of FIG. It is a figure for demonstrating the isochronous transfer system in IEEE1394 standard. It is a data structure of an A pack of audio data according to the DVD audio standard. This is a data structure of data according to the DVD video standard. It is a data structure of an RTI pack according to the DVD audio standard. This is the data structure of the SPCT pack according to the DVD audio standard. It is a detailed view of the data array at the time of transfer. It is a detailed figure of the information stored in the management information area in the header of real data. It is a figure which shows the arrangement | sequence format in real data. It is a figure which shows a channel code. It is a detailed figure in real data. It is another Example of channel information. This is an example of channel assignment. It is another Example in the real data corresponding to FIG. 2 is a detailed block diagram of the player 100 in FIG. 1. It is another Example of a recording / reproducing apparatus. It is a flowchart which shows another operation mode of FIG. 18 is an operation flow when information corresponding to FIG. 17 is stored. It is an operation flow when a down sample flag or a down mix flag is obtained. This is an operation flow when a zero flag or a mute flag is obtained. FIG. 21 is a diagram corresponding to FIG. 20 when 1-bit encoding data is arranged. It is a figure corresponding to FIG. 6 in the case of a 1 bit encoding system. It is a block diagram of the player of the combined use type of a DVD audio system and a 1-bit encoding system. FIG. 23 is a block diagram of a recording / reproducing apparatus on the receiving side corresponding to FIG. 22 which is a combination type of a DVD audio system and a 1-bit encoding system. FIG. 30 is a flowchart showing a decoding process of a signal of the 1-bit encoding method in FIG. 29. FIG.

Explanation of symbols

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, 200a ′ Data transfer interface (transmission means)
21-1 to 21-2, 200b, 200b ′ data transfer interface (
Receiving means)

Claims (3)

An area for storing packet headers, CIP headers, and real data by decoding multi-channel PCM audio data stored in the audio pack from data in which a predetermined data stream is formed including the audio pack, to obtain real data The number of bits identifying whether the actual number of bits of the decoded PCM audio data is 16 bits, 20 bits, or 24 bits in a predetermined area in the packet. Each channel audio data (32 bits) in which identification information and a downsampling flag are arranged adjacent to the PCM audio data are arranged and stored in the order of channels of predetermined channel assignment information (channel assignment), and further, a predetermined number in the packet In the region, the signal processing apparatus characterized by having a packet processing unit for packetizing the format of a predetermined protocol by receiving the channel assignment information. PCM audio data composed of multi-channels stored in the audio pack is decoded from data in which a predetermined data stream including an audio pack is formed, to obtain real data, a packet header, a CIP header, and the real data Is packetized into a structure consisting of an area for storing the data, whether the actual number of bits of the decoded PCM audio data is 16 bits, 20 bits, or 24 bits in a predetermined area in the packet. Each channel audio data (32 bits) having a bit number identification information and a downsampling flag that are arranged adjacent to the PCM audio data is arranged and stored in the order of channels of predetermined channel assignment information (channel assignment), and Predetermined in the packet In the area, the channel allocation information is stored and data that is packetized and transmitted in a predetermined protocol format is received. Based on the bit number identification information, the actual bit number of the PCM audio data is 16 bits, 20 Means for identifying whether it is a bit or 24 bits;
Means for identifying a channel of each channel audio data based on the channel assignment information;
Means for decoding the flag;
A signal processing apparatus comprising: PCM audio data composed of multi-channels stored in the audio pack is decoded from data in which a predetermined data stream including an audio pack is formed, to obtain real data, a packet header, a CIP header, and the real data Is packetized into a structure consisting of an area for storing the data, whether the actual number of bits of the decoded PCM audio data is 16 bits, 20 bits, or 24 bits in a predetermined area in the packet. Each channel audio data (32 bits) having a bit number identification information and a downsampling flag that are arranged adjacent to the PCM audio data is arranged and stored in the order of channels of predetermined channel assignment information (channel assignment), and Predetermined in the packet The area, transmission method is characterized in that so as to transmit by converting the packets corresponding to the serial interface of a predetermined standard and accommodating the channel assignment information through the serial interface of the predetermined standard.

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