JP2001103079A - Data transmitting and receiving device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data transmitting/receiving device and method which can effectively transmit the data and their additional information by means of a data packet. SOLUTION: These device and method transmit and receive the data by means of a packet that consists of a header and plural data blocks of each fixed size. A packeting means 106 arranges identifiers at each prescribed position of plural data fields included in the data blocks, arranges the data in the data field that has the identifier showing the data, arranges the identifier, a sub-identifier and the additional information in the data field, having the identifier showing the additional information and includes both data and data field of the additional information in a signal data block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmitting / receiving apparatus and method for transmitting / receiving data and attached information via a digital interface.

[0002]

2. Description of the Related Art In recent years, IEEE has been used as a serial transmission method.
(The Institute of Electrical and Electronics Engin
eers, Inc.) The 1394 system is drawing attention. IEEE
The 1394 system is a conventional SCSI (small computer sys.
It can be used not only for transmitting computer data by a tem interface) method, but also for transmitting AV data such as audio and video.
This is because the IEEE 1394 system defines two communication methods, asynchronous (asynchronous) communication and isochronous (isochronous) communication. Isochronous communication is a data transmission method that can be used for transmitting data that requires real-time characteristics, such as AV data. In the isochronous communication, a band necessary for transmitting data is acquired before transmission starts. Then, data transmission is performed using the band. Thereby, real-time performance of data transmission is guaranteed. On the other hand, asynchronous communication is a transmission method used for transmission of data that does not require real-time processing and device control, such as transmission of computer data.

[0003] Various methods have been proposed as transmission protocols on IEEE 1394. One of them is an AV protocol. AV protocol is IEC (International Electrotechnical C
ommission) 61883, and defines a method of transmitting and receiving AV data requiring real-time performance by isochronous communication, a method of transmitting and receiving an instruction given to a device by asynchronous communication, and the like.

When data is transmitted and received by isochronous communication, a transmission and reception system is defined for each data format such as video data and audio data. For example, CD
Transmission and reception of audio data such as Audio and Music Data Transmission Protocol determined by the 1394 Trade Association (hereinafter referred to as 1394TA)
ol Rev 1.0 (hereinafter referred to as AM protocol) shows the transmission method. The AM protocol is intended mainly for two-channel audio data transmission. Recently, devices that handle three or more channels of audio data have been developed, and expansion of the standard has been studied to support such devices. I have. This extension is based on 1394TA's "En
hancement to Audio and Music Data Transmission Pro
tocol Working Draft Version 0.1 April 7,1999 ".

A conventional data transmission / reception method based on the audio data transmission method shown in the AM protocol extension plan will now be described with reference to the drawings. Will be described.

FIG. 13 is a diagram showing packet transmission timing on the IEEE 1394 bus. In FIG.
CS is a cycle start packet, ISO is an isochronous packet used for isochronous communication, and ASy is an asynchronous packet used for asynchronous communication. In IEEE 1394, a cycle master node among nodes connected to a bus issues a cycle start packet every isochronous cycle (125 [μs]). Subsequent to the cycle start packet, a node that wants to transmit an isochronous packet starts a transmission request operation, and after acquiring a bus, transmits an isochronous packet. After the transmission of each isochronous packet, when a blank time called an isochronous gap elapses, another node starts a transmission request operation for isochronous packet transmission and performs packet transmission. When all the isochronous packets have been transmitted, a node that wants to transmit an asynchronous packet starts an asynchronous transmission request operation after a blank time called a subaction gap, and transmits an asynchronous packet after acquiring a bus. Since the subaction gap is set to be longer than the isochronous gap, the isochronous packet is processed preferentially, thereby ensuring a constant transfer rate.

Next, transmission of data clock information will be described.

FIG. 14 is a diagram showing transmission of clock information between a transmitting node and a receiving node. In FIG.
1401 is a cycle master node that issues a cycle start packet including a reference count, 1402 is a transmission node, 1403 is a reception node, and 1404 is IEEE13.
94 buses. As described above, various packets are transmitted in a time-division manner in the IEEE 1394 bus.
In No. 4, two types of data lines, a reference count and an isochronous packet, are used for explanation. Also, IEEE
The E1394 bus connects the nodes on a one-to-one basis, and does not make a T-shaped branch on the cable. Therefore, in an actual connection, for example, the cycle master node 1401 and the transmission node 1402 are connected by one cable, and the transmission node 1402 and the reception node 1402 are connected.
3 will be connected by another cable, but here a T-shaped connection is shown to conceptually show that the three nodes have a common reference count.

The cycle master node 1401 has a reference clock generator 1405 and a counter 1406. Similarly, the transmitting node 1402 also sets the reference clock generating means 1407 and the counter 1408 to the receiving node 14.
03 also has a reference clock generating means 1411 and a counter 141.
I have two. Reference clock generating means 1405, 14
07 and 1411 are independent of each other,
The counts of 06, 1408, and 1412 are corrected by the reference count included in the cycle start packet issued by the cycle master node 1401. Therefore, the count value of each node has only an error smaller than the reference clock resolution of each node.

A transmission node 1402 receives an audio clock (for example, 44.1 KHz for a CD) and a count from a counter 1408 to generate a time stamp, and a time stamp generating means 1409, and audio data (for example, for a CD) 16-bit stereo P
There is a packetizing unit 1410 that inputs the CM data) and the time stamp and creates an isochronous packet.

The receiving node 1403 receives the isochronous packet and extracts audio data and a time stamp.
A comparison means for comparing the count of twelve with the time stamp and generating a pulse when they match, and a PLL for reproducing an audio clock based on the pulse.

In the above description, transmission of only audio data has been described. However, as will be described later, with the AM protocol, it is also possible to transmit information attached to data at the same time as data.

Next, the configuration of an isochronous packet will be described. The isochronous packet used for data transmission in the AM protocol has two headers, an isochronous packet header defined by the IEEE 1394 standard and a common isochronous packet defined by the AV protocol. Omitted, only the packet structure below the common isochronous will be described.

In the AM protocol, two packet configuration methods, a blocking method and a non-blocking method, are defined. The blocking method is a method in which when a certain amount of data is accumulated in a transmission node, the data is transmitted as one packet. On the other hand, the non-blocking method is a method in which data generated or arrived at the transmitting node during one isochronous cycle (125 μs) is transmitted as one packet. Here, the non-blocking method is taken as an example.

FIG. 15 is a diagram showing transmission / reception timing of audio data.

In the non-blocking method, packetizing means 1401 is set within an isochronous cycle (125 μs).
Are collected into one isochronous packet.

A time stamp is attached to the isochronous packet in a common isochronous packet header. However, since a plurality of audio data are combined into one packet, it is not possible to attach a time stamp to individual audio data. In the AM protocol, SYT_INTERV according to the data sampling frequency is used.
A parameter called AL is defined.
Generate a time stamp for each INTERVAL. When the sampling frequency is 44.1 kHz, SYT_I
NTERVAL is 8. Time stamp generation means 1
409, an audio clock (44.1 in the case of a CD)
kHz) divided by SYT_INTERVAL (8 for CD)
(Frequency division), and the value of the counter 1408 is sampled at the edge of the frequency division signal (T1, T2,... In FIG. 15). The transmission delay time (352 μs is often used) is added to the sampled value, and the time stamp (R1, R2,...)
And That is, the time stamp is
That is, the time at which the audio data is reproduced is specified on the 03 side.

Since the generation timing of the time stamp is asynchronous with the isochronous cycle, the time stamp is assigned to which data in the packet by the index given by (Equation 1) from the DBC (data block count) of the common isochronous packet header. Indicates whether it is supported.

[0019]

(Equation 1)

As described above, the packetizing means 1410 collects data (in the case of a sampling frequency of 44.1 kHz, usually stores 5 or 6 data in one packet), a time stamp, and an index into one isochronous packet. To form The common isochronous packet header contains various other information, but the description is omitted here.

FIG. 16 shows an example of the configuration of an isochronous packet for transmitting audio data of six channels. In FIG. 16, one line is 4 bytes, the identifier is 1 byte, the data and the attached information are 3 bytes.

In FIG. 16, a common isochronous header (hereinafter referred to as a CIP header) is a header for an isochronous packet. The sending node I is included in the CIP header.
D, the size of a data block (a set of data, for example, in the case of a CD, Lch and Rch are collectively referred to as one data block), the number of data blocks, the format type of an isochronous packet, and information depending on the format type , A time stamp, and the like. The CIP header is 8 bytes.

Identifiers 1 and 2 are data identifiers. Identifier 1 indicates that the valid data is 24 bits, and Identifier 2 indicates that the valid data is 16 bits.

An identifier 3 is an identifier indicating additional information, and stores additional information of the data of the identifiers 1 and 2, for example, dynamic range control information, emphasis information, sampling frequency information for each channel, and the like.

In FIG. 16, 32 bytes following the CIP header constitute one data block. This packet includes n data blocks.

[0026]

However, in the above-mentioned conventional method, although the data itself can be transmitted without any problem, there is a problem that it is inefficient to transmit the accessory information for the entire data. As will be described in detail later, as the copyright-related information, ISRC (International
l Standard Recording Code, defined by ISO3901), catalog code, CCI (Copy Control I
nformation). In these cases, the total length is 18 bytes. However, if all of them are added for each data block, the amount becomes equal to the audio data of 6 channels.

The copy control information and data identification information (copyright related information) of the music data need only be transmitted within a certain period, and need not be transmitted for each individual data. Also, data identification information and the like have a large amount of data, and it is very inefficient to send all of them to each data block.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a data transmission / reception apparatus and method capable of efficiently transmitting data and information attached to the data using data packets.

[0029]

In order to achieve the above object, a data transmitting / receiving apparatus of the present invention is an apparatus for transmitting / receiving data by a packet composed of a header and a plurality of data blocks of a fixed size. An identifier is arranged at a predetermined position in a plurality of data fields in a data block, data is arranged in a data field having an identifier indicating data, and a sub-identifier is arranged in a data field having an identifier indicating attached information. The additional information is arranged, and the data and the data field of the additional information are mixed in one data block.

[0030] Thus, the data and the information attached to the data can be transmitted and received efficiently using the packet composed of the header and the plurality of data blocks of the predetermined size.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data transmitting / receiving apparatus according to a first aspect of the present invention is a data transmitting / receiving apparatus for transmitting / receiving data using a packet composed of a header and a plurality of data blocks of a fixed size. An identifier is arranged at a predetermined position in a plurality of data fields, data is arranged in a data field having an identifier indicating data, and a sub-identifier and auxiliary information are arranged in a data field having an identifier indicating attached information. Then, the data and the data field of the attached information are mixed in one data block.

According to a second aspect of the present invention, in the first aspect, the additional information is divided into a plurality of pieces of additional information, and an identifier indicating the additional information, the additional information and the additional information are attached to each of the additional information. A sub-identifier indicating the correspondence with the information is attached, and the data is transmitted and received in a plurality of data blocks.

According to a third aspect of the present invention, in the first aspect, a plurality of pieces of accessory information are divided into some pieces of accessory information, and each piece of accessory information is associated with the split accessory information and the accessory information. A sub-identifier indicating the relationship is attached and transmitted and received in a plurality of data blocks.

According to a fourth invention of the present invention, in the first to third inventions, packets are transmitted and received using a bus which guarantees transmission and reception of a fixed amount of data within a fixed time. .

According to a fifth aspect of the present invention, in the fourth aspect, a bus which guarantees transmission and reception of a fixed amount of data within a fixed time uses isochronous transmission of an IEEE 1394 bus.

According to a sixth aspect of the present invention, in the first to fifth aspects, the additional information is attached to each fixed amount of data.

According to a seventh aspect of the present invention, in the first to fifth aspects of the present invention, a plurality of pieces of attached information are attached to a fixed amount of data at different rates depending on the attached information.

According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, a plurality of pieces of attached information are attached to each of a fixed amount of data at a different ratio depending on each attached information,
The specific additional information is included in each packet at least one or more.

According to a ninth aspect of the present invention, in the first to seventh aspects, the sub-identifier is predetermined according to the position of the data block in the packet.

The tenth invention of the present invention is directed to the first to ninth embodiments.
In the present invention, there are a plurality of combinations of sub-identifiers determined in advance according to the position of a data block in a packet, and this combination is sequentially repeated for each packet.

The eleventh invention of the present invention relates to the first to the first inventions.
0, the data fields in the data block are arranged according to a predetermined order of identifiers.

The twelfth invention of the present invention is directed to the first to first embodiments.
In one aspect of the invention, the data fields in the data block are arranged in accordance with a predetermined order of identifiers, and in the case of having a sub-identifier, in accordance with the predetermined order of sub-identifiers.

The thirteenth invention of the present invention relates to the first to the first inventions.
In the invention of the second aspect, the data is music data, and the attached information is one or both of data copy control information and data identification information.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) Embodiment 1 shows an example in which a data transmitting / receiving apparatus (or method) divides additional information into several pieces of additional information and transmits the divided information. The bus for transmission is an IEEE 1394 bus.
Hereinafter, Embodiment 1 will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration for realizing a data transmitting / receiving apparatus and method according to the first embodiment of the present invention.

In FIG. 1, 101 is a transmitting node, 10
2 is a receiving node, 103 is an IEEE connecting each node.
The E1393 bus. 104 is a data source, 105 is data timing information from the data source 104 and additional information 2
Information dividing means 106 for inputting the
This is a packetizing means for inputting the data, the attached information 1 and the divided attached information from the attached information dividing means 105. The transmission node 101 is composed of the data source 104, the attached information dividing unit 105, and the packetizing unit 106. 107 is I
Unpacket means for unpacking packets received via the EEE1394 bus 103;
It is an auxiliary information reconstructing means for inputting the divided auxiliary information from 07. Note that a portion related to a time stamp and the like described in the related art is omitted here.

The operation of the first embodiment configured as described above will be described. Data source 1 in transmitting node 101
04 generates audio data. For example, assuming that the data source 104 is a DVD reproducing unit, the reproducing unit reproduces audio data, which is a content recorded on the DVD, and its accompanying information. The data is, for example, 6 ch,
The sampling frequency of 48 kHz, the front left and right two channels have a data length of 24 bits, and the remaining front center, rear left, rear right and bass four channels have a data length of 16 bits. Also,
Among the attached information, information directly attached to each data, such as dynamic range control information, emphasis information, and sampling frequency information for each channel, is sent directly to the packetizing means 106 as attached information 1.

On the other hand, of the additional information, such as data identification information (copyright related information), it is sufficient that the additional information is transmitted for a certain period of time, and the additional information which does not need to be transmitted for each individual data is: It is transmitted to the additional information dividing means 105 as the additional information 2. For example, ISRC (International Standard Recording) is used as an example of data identification information.
Code, defined by ISO3901). FIG. 2 shows the structure of this ISRC.

The ISRC is 8 bytes in total, and
It is composed of I12 characters. I1 to I5 are 6 bits, and I6 to I12 are 4 bits. There are two 0s between I5 and I6. I1 and I2 are country codes, I3 to
I5 is an owner code, I6 and I7 are years, and I8 to I12 are serial numbers. With these 12 characters,
Content can be identified. ISRC has 8 bytes,
This is divided by the attached information dividing means 105 into four divided attached information in units of 2 bytes. Then, these pieces of division information are associated with the sub-identifiers 1 to 4. The divisional auxiliary information associated with the sub-identifiers 1 to 4 is sent to the packetizing means 106 one by one in synchronization with the data timing of the data source 104.

The packetizing means 106 includes a data source 104
Data, attached information 1 and attached information dividing means 105
A packet is constructed from the segmented additional information of. Since the data sampling frequency is 48 kHz and the data is packetized at a cycle of 8 kHz, the packetizing means 106
The data blocks are combined into one data packet. However, the clock of the data source 104 and the IE
The clock for generating the cycle start packet of the EE1394 bus 103 is not always accurately synchronized.
For this reason, depending on the timing, a packet such as five or seven data blocks may be generated. When an IEEE 1394 short bus reset occurs (for example, when a new device is connected), the bus is reconfigured. Immediately after this, the bus is reconstructed during a rebuilding period called a catch-up. A state occurs in which the accumulated data is transmitted by using the maximum capacity of the bus. At this time, seven or more data blocks may be stored in one packet.

FIG. 3 is a diagram showing an example of the configuration of a packet created by the packetizing means 106. FIG. 3 shows a case where six data blocks constitute one packet.

Identifiers 1 and 2 are identifiers representing data.
The identifier 1 indicates that the valid data is 24 bits, and the identifier 2 indicates that the valid data is 16 bits.

The identifier 3 is an identifier indicating additional information. Following this identifier, additional information of the data of the identifiers 1 and 2, for example, dynamic range control information, emphasis information, sampling frequency information for each channel, and the like are stored. You.

The identifier 4 is accompanied by a sub-identifier, and the sub-identifier is followed by two-byte divided accessory information. The division attached information changes in order according to the data timing. For this reason, in the packet of FIG. 3, data block 1 has divisional auxiliary information of sub-identifier 1, but in the packet configured next to FIG. 3, data block 1 has sub-identifier 3.

In the receiving node 102, the isochronous packet from the transmitting node 101 is
Take in 7. The unpacketizing means 107 selectively reproduces data according to the identifier of the packet, and outputs the data in synchronization with the clock as described in the background art. The additional information 1 is also output from the unpacketizing means 107. On the other hand, the divided attached information is sent to the divided attached information reconstructing means 108. The divided accessory information reconstructing means 108 reconstructs the ISRC based on the divided accessory information of the sub-identifiers 1 to 4.

As described above, in the first embodiment, it is sufficient that the information is transmitted for a certain period of time, and it is not necessary to transmit the additional information for each data. By transmitting the data with the identifier and the sub-identifier, the data and the information attached to the data can be transmitted efficiently.

(Embodiment 2) Embodiment 2 shows an example in which the data transmitting / receiving apparatus divides a plurality of pieces of attached information into several pieces of attached information and transmits them. The bus for transmission is an IEEE 1394 bus.

Embodiment 2 will be described below with reference to the drawings.

FIG. 4 is a block diagram showing a configuration for realizing the data transmitting / receiving apparatus and method according to the second embodiment of the present invention. In FIG. 4, the portions common to FIG.
Description is omitted. Reference numeral 405 denotes an auxiliary information dividing unit to which data timing information and auxiliary information 2 and 3 are input from the data source 404, and 408: an auxiliary information to input the split auxiliary information from the unpacketizing unit 107 and reconstruct the auxiliary information 2 and It is an information reconstruction means.

The operation of the second embodiment configured as described above will be described.

Auxiliary information 2 output from data source 404
Is an example of the ISRC described in the first embodiment. The attached information 3 is a catalog number. The catalog number is composed of 13 4-bit BCDs, and is 8-byte data with a 12-bit 0 added to the end. FIG. 5 shows the structure of the catalog number.

Although the catalog number has 8 bytes,
Similarly to the above, this is divided by the attached information dividing means 405 into four divided attached information in units of 2 bytes. Then, these pieces of division information are associated with the sub-identifiers 5 to 8. Sub-identifier 5-8
Are attached to the packetizing means 106 one by one in synchronization with the data timing from the data source 404.

The packetizing means 106 forms a packet of the format shown in FIG. 6 from the data, the attached information 1 and the divided attached information, and sends it to the IEEE 1394 bus 103 as an isochronous packet.

FIG. 6 is a diagram showing an example of the structure of a packet created by the packetizing means 106. FIG. 6 shows a case where six data blocks constitute one packet.

Identifiers 1 and 2 are data identifiers.
The identifier 1 indicates that the valid data is 24 bits, and the identifier 2 indicates that the valid data is 16 bits.

The identifier 3 is an identifier indicating additional information, and stores additional information of the data of the identifiers 1 and 2, such as dynamic range control information, emphasis information, and sampling frequency information for each channel.

Identifier 4 is accompanied by a sub-identifier, and the sub-identifier is followed by 2-byte divided accessory information. The division attached information changes in order according to the data timing. Therefore, in the packet of FIG. 6, the data block 1 has the divisional auxiliary information of the sub-identifier 1, but in the packet configured next to FIG. 6, the data block 1 has the sub-identifier 7.

At the receiving node 102, the isochronous packet from the transmitting node 101 is unpacketized by the
Take in 7. The unpacketizing means 107 reproduces the data in accordance with the packet identifier, and outputs the data in synchronization with the clock as described in the background art. Also,
The attached information 1 is also output from the unpacketizing means 107. On the other hand, the divided accessory information is
8 In the divided attached information reconstructing means 408, the ISRC based on the divided attached information of the sub-identifiers 1 to 4,
The catalog number is reconstructed based on the divided accessory information of the sub-identifiers 5 to 8.

As described above, in the second embodiment, a plurality of types of additional information which need only be transmitted for a certain period of time and need not be transmitted for each data are divided by the additional information dividing means 405, An identifier for each data block,
By transmitting the data with the sub-identifier, it is possible to transmit the data and the information attached to the data efficiently.

(Embodiment 3) Embodiment 3 shows an example in which a plurality of pieces of attached information are attached to data at different ratios depending on the attached information in the data transmitting / receiving apparatus. The bus for transmission is an IEEE 1394 bus.

Recently, content information has also been digitized, and can be copied without any technical deterioration. However, from the viewpoint of copyright protection, it is important to handle in accordance with copy control information (hereinafter referred to as CCI) described later. Therefore,
Preferably, CCI is transmitted more frequently than ISRC or catalog numbers. Here, an example in which CCI is transmitted at twice the frequency of the ISRC or catalog number will be described.

Embodiment 3 will be described below with reference to the drawings.

FIG. 7 is a block diagram showing a configuration for realizing the data transmitting / receiving apparatus and method according to the third embodiment of the present invention. In FIG. 7, the description of the portions common to FIG. 1 is omitted. In FIG. 7, reference numeral 705 denotes a data source 704
708 receives the data attached from the unpacketizing unit 107, and receives the attached information 2, 3, and 4.
4 is an additional information reconfiguring means for reconfiguring 4.

The operation of the third embodiment configured as described above will be described.

The attached information 2 is an ISRC, and the attached information 3 is a catalog number. The additional information 4 takes CCI as an example. The CCI has a 2-byte structure as shown in FIG. In FIG. 8, CC indicates whether copying is possible, NNNNNNN indicates the number of copies that can be made, QQ indicates copying quality, R indicates whether copying of related content is possible, and T indicates information about whether or not advantageous copy conditions can be purchased through decision means such as electronic commerce. Each is stored.

Since this CCI is 2 bytes, it becomes the divisional supplementary information as it is, is associated with the sub-identifier 9, and becomes the supplementary information 2-9.

At first, the auxiliary information dividing means 705 sends the CCI with the sub-identifier 9 to the packetizing means 106 in synchronization with the data timing. From the next data timing, the divided ISRC is sent four times. Then, after sending the CCI again, the divided catalog number is sent four times. By repeating the above, the CCI is transmitted to the packetizing means 106 at twice the frequency of the ISRC and the catalog number.

The packetizing means 106 forms a packet of the format shown in FIG. 9 from the data, the additional information 1 and the divided additional information, and sends it to the IEEE 1394 bus 103 as an isochronous packet.

FIG. 9 is a diagram showing an example of the structure of a packet created by the packetizing means 106. FIG. 9 shows a case where six data blocks constitute one packet.

Identifiers 1 and 2 are identifiers representing data.
The identifier 1 indicates that the valid data is 24 bits, and the identifier 2 indicates that the valid data is 16 bits.

The identifier 3 is an identifier indicating additional information, and stores additional information of the data of the identifiers 1 and 2, for example, dynamic range control information, emphasis information, sampling frequency information for each channel, and the like.

Identifier 4 is accompanied by a sub-identifier, and the sub-identifier is followed by 2-byte divided accessory information. The division attached information changes in order according to the data timing. For this reason, in the packet of FIG. 9, the data block 1 has the divisional auxiliary information of the sub-identifier 9, but in the packet configured next to FIG. 9, the data block 1 has the sub-identifier 5.

In the receiving node 102, the isochronous packet from the transmitting node 101 is unpacketized by the
Take in 7. The unpacketizing means 107 reproduces the data in accordance with the packet identifier, and outputs the data in synchronization with the clock as described in the background art. Also,
The attached information 1 is also output from the unpacketizing means 107. On the other hand, the divisional auxiliary information is divided
8 In the divided attached information reconstructing means 708, the ISRC is obtained based on the divided attached information of the sub-identifiers 1-4.
The CCI is reconfigured based on the catalog number based on the divisional auxiliary information of the sub-identifiers 5 to 8 and the divisional auxiliary information of the sub-identifier 9.

As described above, in the third embodiment, a plurality of pieces of additional information that need only be transmitted for a certain period of time and do not need to be transmitted for each individual
5 and the data blocks are transmitted with an identifier and a sub-identifier attached thereto, so that the data and the attached information of the data can be transmitted efficiently. Further, since a plurality of pieces of attached information can be attached to data at different rates depending on the attached information, the transmission frequency can be changed according to the necessity of the attached information.

(Embodiment 4) In Embodiment 4, in the data transmitting / receiving apparatus, there are two sets of combinations of sub-identifiers determined in advance according to the position of the data block in the packet, and these combinations are alternately set for each packet. Here is an example that is repeated. The bus for transmission is IEEE.
1394 bus.

Embodiment 4 will be described below with reference to the drawings.

FIG. 10 is a block diagram showing a configuration for implementing a data transmitting / receiving apparatus and method according to the fourth embodiment of the present invention. In FIG. 10, the description of the parts common to FIGS. 1 and 7 is omitted. The attached information dividing means 1005 sends the divided attached information to the packetizing means 1006 and inputs the cycle start information from the packetizing means 1006.

The operation of the fourth embodiment configured as described above will be described.

As in the third embodiment, the attached information 2
RC, attached information 3 is catalog number, attached information 4 is C
Take CI as an example.

When the cycle start information is input, the attached information dividing means 1005 first divides the divided ISRC four times into packetized means 100 in synchronization with the data timing.
Send to 6. CCI is sent from the next data timing. Normally, CCI will be sent twice.

The next cycle start information is sent from the packetizing means 1006. Then, the attached information dividing means 1005 sends the catalog number divided in synchronization with the data timing to the packetizing means 1006 four times. CCI is sent from the next data timing. The attached information dividing means 1005 alternately repeats the above operation each time the cycle start information is sent.

The packetizing means 1006 alternately constructs a packet of the format shown in FIG. 11A and a packet of the format shown in FIG. 11B from the data, the additional information 1 and the divided additional information.
The packet is sent as an isochronous packet to the EEE1394 bus 103.

In the receiving node 102, the isochronous packet from the transmitting node 101 is unpacketized by the
07. The unpacketizing means 1007 reproduces data according to the packet identifier, and outputs the data in synchronization with the clock as described in the background art. The additional information 1 is also output from the unpacketizing unit 1007. On the other hand, the divided attached information is sent to the divided attached information reconstructing means 1008. Split auxiliary information reconstructing means 1008
Then, it is determined whether the sub-identifier of the first data block is 1 or 5. If it is 1, it is determined that the ISRC and CCI have been sent, and if it is 5, the catalog number and CCI have been sent. It is not necessary to determine other sub-identifiers. The ISRC, catalog number, and CCI are reconfigured based on the sub-identifier 1 or 5.

As described above, in the fourth embodiment, the sub-identifier is determined in advance according to the position of the data block in the packet, so that the number of determinations can be reduced when reconstructing the additional information.

If the arrangement of sub-identifiers is determined so that one piece of attached information does not extend between packets, there is no need to collect the attached pieces of information from a plurality of packets, and the divided attached information is temporarily stored. It is possible to reduce the circuit scale of a memory or the like to be stored.

Note that the identifiers in the data block are arranged in a predetermined ascending order (since the sub-identifier is determined in advance by the position of the data block in the packet).
In addition, there is no need to rearrange the data fields, so that a work memory or the like is not required and the circuit scale can be reduced. For example, the values shown in FIGS. 12A and 12B are assigned to the identifiers and sub-identifiers used in the fourth embodiment. Then, in one data block, the data is arranged first, and the attached information is arranged after all the data. In addition, there may be a configuration in which a plurality of data fields having the identifier 4 exist in one data block. In this case, similarly, the auxiliary information transmitted by the identifier 4 also includes the order of the ISRC, the catalog information, and the CCI (however, all divisions are performed). The additional information is not always included in one data block).

[0098]

As described above, according to the present invention, a plurality of pieces of auxiliary information which need only be transmitted for a certain period of time and do not need to be transmitted for each data are divided by the By transmitting the block with the identifier and the sub-identifier attached, there is an effect that the data and the accessory information of the data can be transmitted efficiently. Further, since a plurality of pieces of attached information can be attached to data at different rates depending on the respective attached information, there is an effect that the transmission frequency can be changed according to the necessity of the attached information. Furthermore, since the sub-identifier is determined in advance according to the position of the data block in the packet, it is possible to reduce the number of determinations when reconstructing the additional information. In addition, since the placement of sub-identifiers is determined so that one piece of attached information does not extend between packets, there is no need to collect divided attached information from multiple packets, and reduce the circuit scale of working memory and the like. There is an effect that it becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration for realizing a data transmitting / receiving apparatus and method according to a first embodiment of the present invention;

FIG. 2 shows an ISR in the data transmitting / receiving apparatus and method.
Diagram showing the structure of C (International Standard Recording Code)

FIG. 3 is a diagram showing an example of a packet configuration in the data transmitting / receiving apparatus and method.

FIG. 4 is a block diagram showing a configuration for realizing a data transmitting / receiving apparatus and method according to a second embodiment of the present invention;

FIG. 5 is a diagram showing a structure of a catalog number in the data transmitting / receiving apparatus and method.

FIG. 6 is a diagram showing an example of a packet configuration in the data transmission / reception apparatus and method.

FIG. 7 is a block diagram showing a configuration for realizing a data transmitting / receiving apparatus and method according to a third embodiment of the present invention;

FIG. 8 shows CCI in the data transmitting / receiving apparatus and method.
Diagram showing the structure of (Copy Control Information)

FIG. 9 is a diagram showing an example of a packet configuration in the data transmitting / receiving apparatus and method.

FIG. 10 is a block diagram showing a configuration for realizing a data transmitting / receiving apparatus and method according to a fourth embodiment of the present invention;

FIG. 11 is a diagram showing an example of a packet configuration in the data transmitting / receiving apparatus and method.

FIG. 12 is a diagram showing an example of an identifier value and a sub-identifier value in the data transmitting / receiving apparatus and method.

FIG. 13 is a diagram showing packet transmission timing on the IEEE 1394 bus;

FIG. 14 is a block diagram showing transmission of clock information between a transmission node and a reception node as a conventional data transmission / reception device.

FIG. 15 is a diagram showing transmission / reception timing of audio data in a conventional data transmission / reception device.

FIG. 16 is a diagram showing a configuration example of an isochronous packet when transmitting 6-channel audio data in a conventional data transmitting / receiving apparatus;

[Explanation of symbols]

101 transmitting node 102 receiving node 103 IEEE 1394 bus 104, 404, 704 data source 105, 405, 705, 1005 attached information dividing means 106, 406, 1006 packetizing means 107, 1007 unpacking means, 108, 408, 708, 1008 attached Information reconstruction means

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masataka Nikaido 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. Terms (reference) 5K032 AA01 AA03 BA15 CA12 CC13 CD13 DA01 DB15

Claims (26)

[Claims] 1. A data transmitting / receiving apparatus for transmitting / receiving data by a packet composed of a header and a plurality of data blocks of a fixed size, wherein an identifier is arranged at a predetermined position in a plurality of data fields in the data block. , Data is placed in a data field having an identifier indicating data, and a data field having an identifier indicating attached information is assigned a sub-identifier and attached information. A data transmission / reception device characterized by mixing the above. 2. The method according to claim 1, wherein the additional information is divided into several pieces of additional information, and each of the additional information is provided with an identifier indicating the additional information and a sub-identifier indicating a correspondence between the additional information and the additional information. 2. The data transmitting / receiving device according to claim 1, wherein the data transmitting / receiving is performed by dividing the data into data blocks. 3. A plurality of pieces of attached information are divided into a plurality of pieces of attached information, and each of the pieces of attached information is assigned a sub-identifier indicating a correspondence relationship between the attached information and the attached information, and divided into a plurality of data blocks. 2. The data transmitting / receiving device according to claim 1, wherein the data is transmitted / received. 4. The data transmission / reception apparatus according to claim 1, wherein packet transmission / reception is performed using a bus guaranteed to transmit / receive a fixed amount of data within a predetermined time. 5. The data transmitting / receiving apparatus according to claim 4, wherein the bus which guarantees transmission and reception of a certain amount of data within a predetermined time uses isochronous transmission of an IEEE 1394 bus. 6. The data transmitting / receiving apparatus according to claim 1, wherein the attached information is attached to each of a fixed amount of data. 7. The data transmitting / receiving apparatus according to claim 1, wherein a plurality of pieces of attached information are attached to each of a fixed amount of data at a different rate depending on the attached information. 8. A method of attaching a plurality of pieces of attached information to a fixed amount of data at a different ratio depending on each attached information,
8. The data transmitting / receiving apparatus according to claim 7, wherein at least one specific additional information is included in each packet. 9. The data transmitting / receiving apparatus according to claim 1, wherein a sub-identifier is determined in advance according to a position of a data block in the packet. 10. The data transmitting / receiving apparatus according to claim 1, wherein a plurality of combinations of sub-identifiers are determined in advance according to the position of the data block in the packet, and the combination is sequentially repeated for each packet. . 11. The data transmitting / receiving apparatus according to claim 1, wherein the data fields in the data block are arranged in accordance with a predetermined order of the identifier. 12. The data field in a data block is arranged according to a predetermined order of identifiers and, in the case of having a sub-identifier, according to a predetermined order of sub-identifiers. A data transmitting / receiving device according to claim 1. 13. The data transmitting / receiving apparatus according to claim 1, wherein the data is music data, and the attached information is at least one of data copy control information and data identification information. 14. A data transmission / reception method for transmitting / receiving data by a packet composed of a header and a plurality of data blocks of a fixed size, wherein an identifier is arranged at a predetermined position in a plurality of data fields in the data block. , Data is placed in a data field having an identifier indicating data, and a data field having an identifier indicating attached information is assigned a sub-identifier and attached information. A data transmission / reception method characterized by mixing the above. 15. An accessory information is divided into a plurality of pieces of attached information, and each of the attached pieces of information is added with an identifier indicating the attached information and a sub-identifier indicating a correspondence relationship between the divided attached information and the attached information, and The data transmission / reception method according to claim 14, wherein the data transmission / reception is divided into the data blocks. 16. A plurality of pieces of attached information are divided into a plurality of pieces of attached information, and each of the pieces of attached information is assigned a sub-identifier indicating a correspondence relationship between the added information and the attached information, and divided into a plurality of data blocks. The data transmission / reception method according to claim 14, wherein the data transmission / reception is performed. 17. The data transmission / reception method according to claim 14, 15 or 16, wherein packet transmission / reception is performed using a bus which guarantees transmission / reception of a fixed amount of data within a predetermined time. 18. The data transmission / reception method according to claim 17, wherein the bus which guarantees transmission / reception of a certain amount of data within a predetermined time uses isochronous transmission of an IEEE 1394 bus. 19. The data transmitting / receiving method according to claim 14, wherein the attached information is attached for each fixed amount of data. 20. The data transmission / reception method according to claim 14, wherein a plurality of pieces of attached information are attached to each of a fixed amount of data at a different ratio depending on each attached information. 21. The data transmission / reception method according to claim 20, wherein a plurality of pieces of attached information are attached to each of a fixed amount of data at a different ratio according to each attached information, and at least one specific attached information is included in each packet. . 22. The data transmission / reception method according to claim 14, wherein a sub-identifier is determined in advance according to a position of a data block in the packet. 23. The data transmission / reception method according to claim 14, wherein there are a plurality of combinations of sub-identifiers determined in advance according to the positions of the data blocks in the packet, and the combination is sequentially repeated for each packet. . 24. The data transmitting / receiving method according to claim 14, wherein the data fields in the data block are arranged according to a predetermined order of the identifiers. 25. The data field in a data block according to any one of claims 14 to 22, wherein the data field is arranged in accordance with a predetermined order of identifiers, and in the case of having a sub-identifier, in accordance with a predetermined order of sub-identifiers. Data transmission / reception method described in 1. 26. The data transmission / reception method according to claim 14, wherein the data is music data, and the attached information is at least one of data copy control information and data identification information.