JP2001060960A - Transmission method, electronic equipment and provision medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute a proper processing suitable for a data size to be transmitted by transmitting data concerning the data size to be transmitted from a first unit from the first unit to the second unit and, then, starting data transmission from the first one to the second one. SOLUTION: When a producer function and a control function are commonly used in a digital satellite broadcasting receiver (IRD) 10, for example, data is transmitted to a consumer being a disk recording and reproducing device 50. When a connection processing and a recording instruction processing are completed, the producer transmits CONTENT INFO data to the consumer by the packet of a control command in an AV/C command. When data concerning the data size is received, the disk recording and reproducing device 50 executes a processing for securing an area to receive and process the data or the like and prepares for data reception. IRD 10 transmits prepared still picture to the device 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, IEEE 1
The present invention relates to a transmission method for performing data transmission between devices connected by a 394 system bus line, an electronic device for performing transmission using the transmission method, and a providing medium for providing a program to which the transmission method is applied.

[0002]

2. Description of the Related Art AV equipment capable of mutually transmitting information via a network using an IEEE 1394 serial data bus has been developed. When data is transmitted via this bus, the isochronous transfer mode used for transmitting relatively large-capacity moving image data and audio data in real time, and still images, text data, control commands, etc., must be securely transmitted. Asynchronous transfer modes used for transmission are prepared, and a dedicated band is used for transmission for each mode.

FIG. 41 shows an example of a transmission process in the above-mentioned asynchronous transfer mode. Here, a device that sends data to the bus line in the asynchronous transfer mode is called a producer, and a device that receives data transmitted through the bus line is called a consumer.

When data is transmitted in the asynchronous transfer mode, data transmitted on the consumer side is stored as segmented data for each predetermined data amount. And the consumer, to the producer,
Data requesting transmission of data of a predetermined data amount (here, 32 kbytes) is transmitted (step S101). When the producer receives this request, the producer transmits one segment of data to the consumer at a timing when data can be transmitted in the asynchronous transfer mode (step S102).

[0005] Thereafter, this one segment (32 kbytes)
e), the completion of the data transmission is notified, and the fact that there is data following this segment is transmitted from the producer to the consumer (step S10).
3). When this data is received by the consumer, the next 32
Data requesting transmission of kbytes of data is sent to the producer (step S104). When the producer receives this request, the producer transmits the data of the next segment to the consumer at the timing when data can be transmitted in the asynchronous transfer mode (step S105). In the transmission in step S105,
It is assumed that the transmission data amount is only 24 kbytes and the transmission of the prepared data has been completed. In the transmission of the data of this segment, when the transmission of the prepared data is completed, the completion of the data transmission of 24 kbytes is transmitted from the producer to the consumer (step S10).
6).

On the consumer side, this step S106
Is notified that the total data amount transmitted for the first time is 56 kbytes (32 k + 24 k).

[0007]

As described above, in the asynchronous transfer mode described above, the receiving side only knows the transmission data size when the transmission is completed. Therefore, it has been difficult for the receiving side to perform processing according to the data size. That is, for example, it is difficult to secure a reception buffer area having an appropriate data size in advance. Further, there is a limit on the size of the data storage space that can be prepared on the receiving side, and there is a problem that it is not possible to detect a size error before data transmission in an unreceivable area due to a large size of transmission data.

[0008] An object of the present invention is to avoid the problem that the size of data to be transmitted is not known on the receiving side in a network such as the IEEE 1394 system.

[0009]

A transmission method according to the present invention is a transmission method for transmitting data between devices connected to a predetermined network, wherein the first device and the second device are connected to a predetermined network. A connection establishing step for establishing a connection for data transmission with the first device, and a data size transmission for transmitting data relating to the data size transmitted from the first device to the second device from the first device. And a data transmission step of starting data transmission from the first device to the second device after the data size transmission process.

An electronic device according to the present invention is an electronic device connected to a predetermined network, which establishes a connection with another device connected to the network to input / output data with the other device. Means,
Control means for detecting a data size of data transmitted to and from another device.

[0011] The providing medium of the present invention provides a program for controlling communication performed between devices connected to a predetermined network. The providing medium includes a first device and a second device connected to a predetermined network. When communication is performed between the first device and the first device, a process for establishing a connection between the plug of the first device and the plug of the second device and data relating to the data size transmitted from the first device are transmitted to the first device. And a process for transmitting the data from the second device to the second device.

According to these inventions, a receiving-side device (electronic device) connected to a network can confirm the size of data to be transmitted before data transmission is started.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to FIGS.

An example of the configuration of a network system to which the present invention is applied will be described with reference to FIG. In this network system, a plurality of devices are connected via a cable 26 constituting a serial data bus of the IEEE1394 system. Here, as shown in FIG. 1, an IRD (Integrated Receiver Decoder) each having an IEEE1394 bus connection terminal.
10 and a disk recording / reproducing device 50 are connected to a cable 26. The IRD 10 is a digital satellite broadcast receiver, and performs reception processing of a signal input via the connected antenna 30 and also performs demodulation processing of a broadcast signal of the received channel.
In this case, as channels that can be received, there are a channel for radio broadcasting using an audio signal (audio signal) and a channel for data broadcasting in addition to a channel for television broadcasting using a video signal and an audio signal.

The IRD 10 includes a television monitor 40
Are connected by an analog cable, and the broadcast received by the IRD 10 can be viewed on the monitor 40. The monitor 40 may be connected to the cable 26 and video data and the like may be transmitted to the monitor 40 via the cable 26.

The disk recording / reproducing device 50 is a device for recording and reproducing audio signals and the like using a magneto-optical disk or optical disk called a mini disk (MD) as a recording medium.

FIG. 2 is a diagram showing details of a configuration for receiving and recording a broadcast signal of the digital satellite broadcast system. A broadcast radio wave from a satellite (not shown) is received by an antenna 30 and transmitted to a tuner 11 as program selection means provided in an IRD 10 as a program receiving device. Each circuit of the IRD 30 operates under the control of the CPU 20, and sends a reception signal S 30 from a transponder selected by the tuner 11 to the front end unit 12.

The front end unit 12 receives the received signal S30
After demodulating the received data and subjecting the resulting received data to error correction processing,
To the descramble circuit 13.

The descrambling circuit 13 multiplexes the contracted channel multiplexed data D32 of the received data stream D31 based on the contracted channel encryption key information stored in an IC card (not shown) inserted into the main body of the IRD 10. And sends it to the demultiplexer 14.

The demultiplexer 14 outputs the multiplexed data D
32 are rearranged for each channel, only the channel designated by the user is taken out, a video stream D33 composed of video part packets is sent to the MPEG video decoder 15, and an overlap stream D34A composed of audio part packets is converted to MPEG. The data is sent to the audio decoder 16.

The MPEG video decoder 15 restores the video data D35 before compression encoding by decoding the video stream D33 and sends it to the NTSC encoder 17. The NTSC encoder 17 converts the video data D35 into a luminance signal and a color difference signal of the NTSC system, and sends them to the digital-to-analog conversion circuit 18 as NTSC data D36. The digital-to-analog conversion circuit 18 converts the NTSC data D36 into an analog signal S37, and outputs this to the monitor 40 as an image.

The MPEG audio decoder 16 decodes the audio stream D34A,
PCM (Pulse Code Mod) before compression encoding
ULATION) The audio data D38 is restored and sent to the digital / analog conversion circuit 19. This PCM audio data D38 is
4 to be transmitted to the bus line 26. further,
The PCM audio data D38 can be directly transmitted to the disk recording / reproducing device 50 via the cable 27 which is not a bus line.

The digital / analog conversion circuit 19 is a PC
By converting the M audio data D38 into an analog signal, an LCh audio signal S39A and an RCh audio signal S39B are generated and output as audio through a speaker (not shown) of the monitor 40, and the disk recording / reproducing device 50 Analog-to-digital conversion circuit 5
8

By the way, when the music channel is designated among the contract channels, the demultiplexer 14
The audio stream D3 from the multiplexed data D32
4A is sent to the MPEG audio decoder 16, and an additional audio information stream D34B as additional information including audio additional information packets is transmitted to the CPU 20 via the IEEE1394 interface 24.

The CPU 20 outputs the ID (IDentifi) added to each of the packets of the audio additional information stream D34B represented by characters and numerals.
), and generates title data D40 as program additional information based on the number.

At this time, the CPU 20 as a recording control means
Generates recording control data D41 as a control signal for controlling recording operations such as recording start and recording stop based on a recording command input by a user via an operation button (not shown) on the operation panel 23. Then, the recording control data D41 and the title data D40 are sent back to the IEEE 1394 interface 26 as control data D42.

IEEE 1394 interface 26
Is a disk recording / reproducing device 5 serving as a data recording / reproducing means for transmitting control data D42 supplied from the CPU 20 through an IEEE1394 cable 26 serving as a data transmitting / receiving means.
0 via the IEEE 1394 interface 51
PUM and the PCM audio data D
38 from the IEEE1394 cable 26 to the IEEE13
The signal is sent to the ATRAC (registered trademark) encoder 53 via the interface 94.

The ATRAC encoder 53 includes a CPU 52
AT PCM audio data D38 based on the control of
High-efficiency encoding is performed by the RAC method, and this is transmitted to the recording / reproducing system 54 as PCM audio data D43.

CPU 52 of disk recording / reproducing device 50
Is adapted to control the recording operation of the recording / reproducing system 54 and the optical pickup 55 based on the recording control data D41 of the control data D42. After performing a predetermined modulation process, the data is recorded as recording data D44 via an optical pickup 55 in a designated area of a magneto-optical disk 56 as a recording medium.

The CPU 5 of the disk recording / reproducing device 50
2 is a recording / reproducing system 54 based on the recording control data D41.
By controlling the recording operation of the optical pickup 55, data represented by half-width katakana and alphanumeric characters in the title data D40 is recorded in a predetermined area of the magneto-optical disk 56 as kana alphanumeric code title data D40A. At the same time, the data represented by full-width kanji and hiragana is converted to kanji code title data D40.
B is recorded in a predetermined area.

As described above, the IRD 10 controls the recording operation of the disk recording / reproducing device 50 by the CPU 20 to
The CM audio data D38 can be recorded in a predetermined area of the magneto-optical disk 56, and the title data D40 corresponding to the PCM audio data D38 to be recorded is recorded in a predetermined area (TOC area) of the magneto-optical disk 56. ing.

At the time of reproduction, the disk recording / reproducing device 5
0 sends the reproduction data D45 reproduced by the optical pickup 55 to the recording / reproduction system 54. Recording / reproducing system 54
Performs an error correction process and a predetermined demodulation process on the reproduction data D45, and uses this as reproduction data D46.
It is sent to the TRAC decoder 57.

The ATRAC decoder 57 outputs the reproduced data D
46 is decoded by the ATRAC method and is output as digital reproduction data D47 to the outside through the optical digital cable 60, or the analog LCh audio signal S is output through the digital / analog conversion circuit 59.
48 and an RCh audio signal S49, which are output as sound from speakers 61L and 61R connected to the amplifier device 61.

The disk recording / reproducing apparatus 50 reads title data D50 corresponding to the reproduced data D45 being reproduced from the TOC1 area and / or the TOC4 area of the magneto-optical disk 56 by the optical pickup 55, and sends it to the recording / reproducing system 54. I do. The recording / reproducing system 54 performs an error correction process and a predetermined demodulation process on the title data D50, and then uses this as title data D51.
Send to PU52.

The CPU 52 determines that the title data D51 is R
AM (Random Access Memory) 52
A and store the title data D51 in I
IEEE 1394 interface 51, IEEE 139
4 cable 26, IEEE1394 interface 2
4 and to the RAM 21 via the CPU 20 so that the title data D51 is used as storage means in the RAM 2
1 is stored.

In this state, when instruction information for displaying the image data corresponding to the title data D51 on the monitor 40 is input via the operation panel 46, the CPU 20 as the display control means reads the title data D52 from the RAM 21. And sends it to the MPEG video decoder 15. The MPEG video decoder 15 performs predetermined graphics processing on the title data D52, and converts the resulting image data into the NTSC encoder 1
7 and the monitor 40 via the digital / analog conversion circuit.
And displays a GUI (graphic user interface) screen on a monitor 40 as a display means.

FIG. 3 is a diagram showing a cycle structure of data transmission of devices connected by IEEE1394. IEEE
In E1394, the data is divided into packets,
The data is transmitted in a time-division manner based on a cycle having a length of 5 μS. This cycle is created by a cycle start signal supplied from a node having a cycle master function (any device connected to the bus). The isochronous packet secures a band (a time unit but called a band) necessary for transmission from the beginning of every cycle. Therefore, in isochronous transmission, transmission of data within a certain time is guaranteed. However, if a transmission error occurs, there is no protection mechanism and data is lost. Asynchronous transmission, in which the node that has secured the bus as a result of arbitration, sends out asynchronous packets during the time that is not used for isochronous transmission in each cycle, ensures reliable transmission by using acknowledgments and retries. However, the transmission timing is not constant.

In order for a given node to perform isochronous transmission, the node must be compatible with the isochronous function. At least one of the nodes corresponding to the isochronous function must have a cycle master function. Further, at least one of the nodes connected to the IEEE 1394 serial bus includes:
It must have the function of an isochronous resource manager.

IEEE 1394 is an ISO / IEC13 standard.
CSR (Control & Status Register) having a 64-bit address space defined by H.213
er) architecture. Figure 4 shows the CSR
FIG. 2 is a diagram illustrating a structure of an address space of an architecture. The upper 16 bits are a node ID indicating a node on each IEEE 1394, and the remaining 48 bits are used for designating an address space given to each node. The upper 16 bits are further divided into 10 bits of a bus ID and 6 bits of a physical ID (node ID in a narrow sense). A value in which all bits are 1 is used for a special purpose.
Three buses and 63 nodes can be specified.

Of the 256 terabytes of address space defined by the lower 48 bits, the space defined by the upper 20 bits is the initial register space (2048 bytes) used for CSR-specific registers and IEEE1394-specific registers. Initial Register
er Space), Private Space (Priv)
a space) and an initial memory space (Initial Memory Space). When the space defined by the lower 28 bits is the initial register space, the configuration ROM (initial memory space) C
configuration readonly mem
ory), an initial unit space (Initial Unit Spac) used for a node-specific application.
e), plug control register (Plug Conn
control register (PCRs).

FIG. 5 is a diagram for explaining offset addresses, names, and functions of main CSRs. The offset in FIG. 5 is the FF where the initial register space starts.
FFF00000000h (The number with h at the end is 16
(Indicating a hexadecimal notation). Bandwidth available register with offset 220h (Bandwidth Av)
“able Register” indicates a band that can be allocated to the isochronous communication, and only the value of the node operating as the isochronous resource manager is valid. That is, although each node has the CSR in FIG. 4, only the isochronous resource manager of the bandwidth available register is valid. In other words, the bandwidth available register has substantially only the isochronous resource manager. The maximum value is stored in the bandwidth available register when a band is not allocated to isochronous communication, and the value decreases each time a band is allocated.

Channel available registers (Channels Ava) at offsets 224h to 228h
“ilable Register”, each bit corresponds to each of channel numbers 0 to 63, and when the bit is 0, it indicates that the channel has already been allocated. Only the channel available register of the node operating as the isochronous resource manager is valid.

Referring back to FIG. 4, a general ROM is stored at addresses 200h to 400h in the initial register space.
A configuration ROM based on a (read only memory) format is provided. FIG. 6 is a diagram illustrating the general ROM format. A node, which is a unit of access on IEEE 1394, can have a plurality of units that operate independently while using an address space commonly in the node.
Unit directory (unit directory)
es) can indicate the software version or location for this unit. The positions of a bus info block and a root directory are fixed, but the positions of other blocks are specified by offset addresses.

FIG. 7 is a diagram showing details of the bus info block, the root directory, and the unit directory. Company in the bus info block
The ID stores an ID number indicating the manufacturer of the device.
The Chip ID stores an ID unique to the device and unique in the world that does not overlap with other devices. In addition, IEC6
According to the standard of 1833, the unit specification ID (u) of the unit directory of the device satisfying IEC61883
In the first octet, 00h is written in the first octet, Aoh is written in the second octet, and 2Dh is written in the third octet. Furthermore, the unit switch version (unit swv
area) for the first octet, 01h
Is the third octet LSB (Least Sign)
"1" is written in "ififant Bit).

In order to control the input and output of the device via the interface, the node stores IEC6 addresses at addresses 900h to 9FFh in the initial unit space shown in FIG.
1883 (Plug Contro
l Register). This implements the concept of a plug in order to form a signal path logically similar to an analog interface. FIG. 8 is a diagram illustrating the configuration of the PCR. PCR stands for output plug C (oPCR) representing an output plug.
control Register), iPCR (input Plug Control R) representing an input plug
register). The PCR is a register oMPR (output Master Plug R) indicating information of an output plug or an input plug unique to each device.
register) and iMPR (input Master)
r Plug Register). Although each device does not have a plurality of oMPRs and iMPRs, oPCR and iPC
It is possible to have a plurality of R depending on the capability of the device.
The PCR shown in FIG. 8 has 31 oPCRs and 31 iPCRs, respectively. The flow of isochronous data is controlled by manipulating registers corresponding to these plugs.

FIG. 9 shows oMPR, oPCR, iMPR,
FIG. 3 is a diagram illustrating a configuration of an iPCR. FIG. 9A shows o
FIG. 9B shows the configuration of the MPR, FIG.
(C) shows the configuration of the iMPR, and FIG. 9 (D) shows the configuration of the iPCR. MSB of oMPR and iMPR
2 bit data rate capability (data
In rate capability), a code indicating the maximum transmission rate of isochronous data that can be transmitted or received by the device is stored. oMPR broadcast channel base (broadcast cha)
“nnel base” specifies the number of a channel used for broadcast output.

The 5-bit number of output plugs (number of out plugs) on the LSB side of oMPR
In “put plugs”, a value indicating the number of output plugs of the device, that is, the number of oPCRs is stored.
5-bit number of input plug on the LSB side of iMPR
gs) stores the number of input plugs of the device, that is, a value indicating the number of iPCRs. non-pers
istent extension field and persistent extension field
d is an area defined for future expansion.

The on-line of the MSB of the oPCR and iPCR indicates the usage status of the plug.
That is, if the value is 1, the plug is ON-LI
NE, and 0 indicates OFF-LINE. oPCR and iPCR broadcast connection counters
The value of “tion counter” indicates whether there is a broadcast connection (1) or no (0). o
Point-to-point connection counter (point-to-point) having a 6-bit width of PCR and iPCR
point connection counter)
Has a point-to-point connection (point-to-point co
nection).

A channel number having a 6-bit width of oPCR and iPCR is used.
The value of r) indicates the number of the isochronous channel to which the plug is connected. The value of the data rate (data rate) having a 2-bit width of the oPCR indicates the actual transmission speed of the isochronous data packet output from the plug. The code stored in the 4-bit overhead ID (overhead ID) of the oPCR indicates the over-bandwidth of the isochronous communication. The value of the payload (payload) having a 10-bit width of the oPCR indicates the maximum value of data included in an isochronous packet that can be handled by the plug.

FIG. 10 is a diagram showing the relationship between plugs, plug control registers, and isochronous channels. AV devices (AV-devices) 71 to 7
3 is connected by an IEEE1394 serial bus. OPCR in which the transmission speed and the number of oPCRs are defined by the oMPR of the AV device 73

[0] to oPCR
Of [2], isochronous data whose channel is designated by oPCR [1] is transmitted to channel # 1 of the IEEE 1394 serial bus. IPCR in which the transmission speed and the number of iPCRs are defined by the iMPR of the AV device 71

[0] and iPC
Of R [1], input channel # 1 is the transmission speed and iP
CR

According to [0], the AV device 71
The isochronous data transmitted to channel # 1 of the 94 serial bus is read. Similarly, the AV device 72
Is oPCR

Channel # 2 (ch specified by [0]
The AV device 71 transmits the isochronous data to the channel # 2 specified by the iPRC [1].

As described above, data transmission is performed between devices connected by the IEEE 1394 serial bus. In the system of the present embodiment, the IEEE 1394 serial bus is used.
Using an AV / C command set defined as a command for controlling a device connected via a serial bus, control of each device and determination of a state can be performed. Next, the AV / C command set will be described.

First, when recording various information in the system of this embodiment, the Subunit Identifier used
The data structure of the enhancer descriptor will be described with reference to FIGS. FIG.
Is the Subunit Identifier Desc
4 shows a data structure of a descriptor. As shown in FIG. 11, the Subunit Identifier De
It is formed by a list of a hierarchical structure of the descriptor. The list represents, for example, a receivable channel in the case of a tuner, and music recorded in the tuner in the case of a disc. The list in the highest layer of the hierarchical structure is called a root list, and for example, list 0 is the root for the lower list. Lists 2 through (n-
1) is similarly a route list. There are as many route lists as objects. Here, the object is, for example, each channel in digital broadcasting when the AV device is a tuner. In addition, all the lists in one hierarchy share common information.

FIG. 12 is a block diagram of The General Subunit Ide used in the existing system.
It shows the format of the ntifier descriptor. Subunit Identifier
In the Descriptor 41, attribute information on functions is described in contents. descr
It does not include the value of the IPL length field itself. The generation ID indicates the version of the AV / C command set, and its value is shown in FIG.
As shown in FIG. 7, the current value is "00h" (h represents hexadecimal). Here, "00h" indicates that the data structure and the command are AV / C General Specifica.
This means that the version is 3.0. As shown in FIG. 13, all values except “00h” are reserved and reserved for future specifications.

The size of list ID indicates the number of bytes of the list ID. size of ob
The project ID indicates the number of bytes of the object ID. size of object posto
“in” indicates a position (the number of bytes) in the list used for reference when performing control. number of
root object lists indicates the number of root object lists. root object
ct list id indicates an ID for identifying the root object list at the top of each independent hierarchy.

Subunit dependent 1
The length is the following subdependent
The number of bytes of the information field is shown. subunit dependent info
“rmation” is a field indicating information unique to the function. manufacturer dependen
t length is the following manufacturer
It indicates the number of bytes in the dependent information field. manufactory
r dependent information is
This field indicates the specification information of the vendor (maker). It should be noted that "manufacture" is included in the descriptor.
If there is no r dependent information, this field is not present.

FIG. 14 shows the allocation range of the list ID shown in FIG. As shown in FIG.
00h to 0FFFh "and" 4000h to FFF "
“Fh” is reserved and reserved as an allocation range for future specifications: “1000h to 3FFFh” and “10000h to max list ID value”
“e” is provided to identify the dependent information of the function type.

Next, the AV /
The C command set will be described with reference to FIGS. FIG. 15 shows a stack model of the AV / C command set. As shown in FIG. 15, the physical layer 81, the link layer 82, the transaction layer 83, and the serious bus management 84
It conforms to EE1394. FCP (Function
n Control Protocol) 85 is IEC
61883. AV / C command set 8
6 is AV / C Digital Interface
Command Set General Spec
It conforms to the information.

FIG. 16 is a diagram for explaining commands and responses of the FCP 85 of FIG. FCP is IE
This is a protocol for controlling AV equipment on EE1394. As shown in FIG. 16, the controlling side is the controller, and the controlled side is the target. The transmission or response of the FCP command is performed between nodes using a write transaction of asynchronous communication of IEEE1394. The target that has received the data returns an acknowledgment to the controller to confirm reception.

FIG. 17 is a diagram for explaining the relationship between the FCP command and the response shown in FIG. 16 in more detail. Node A and node B are connected via an IEEE 1394 bus. Node A is the controller and node B is the target. Each of the node A and the node B has a command register and a response register prepared for each 512 bytes. As shown in FIG. 17, the controller transmits a command by writing a command message to the command register 93 of the target. Conversely, the target transmits a response by writing a response message to the response register 92 of the controller. Control information is exchanged for the above two messages. The type of command set sent by FCP is described in CTS in the data field of FIG. 18 described later.

FIG. 18 shows the data structure of a packet transmitted in the asynchronous transfer mode of the AV / C command. The AV / C command set is a command set for controlling AV equipment, and CTS (command set ID) = "0000". AV / C command frames and response frames are exchanged between nodes using the FCP. To avoid burdening the bus and AV equipment, the response to the command is 1
It is to be performed within 00 ms. As shown in FIG. 18, the data of the asynchronous packet is
It is composed of two bits (= 1 quadlet). The upper part in the figure shows the header part of the packet, and the lower part in the figure shows the data block. destinatio
n_ID indicates a destination.

CTS indicates the ID of the command set. In the AV / C command set, CTS = "0000"
It is. The type / response field indicates the functional classification of the command when the packet is a command, and indicates the processing result of the command when the packet is a response. The commands are roughly divided into (1) a command for controlling functions from outside (CONTROL), (2) a command for inquiring the state from outside (STATUS),
(3) A command (GENERAL INQUIRY (o
pccode support) and SPECIFIC
INQUIRY (opcode and operand
s)), and (4) four types of commands (NOTIFY) for requesting external notification of state changes are defined.

The response is returned according to the type of the command. Responses to the CONTROL command include NOT INPLEMENTED (not implemented), ACCEPTED (accept), and REJECT.
ED (rejection) and (INTERIM (provisional). The response to the STATUS command includes N
OT INPLEMENTED, REJECTED, I
N TRANSITION (migrating) and STAB
There is LE (stable). GENERAL INQUIRY
Responses to the SPECIFIC INQUIRY command include IMPLEMENTED (implemented) and NOT IMPLEMENTED. In response to the NOTIFY command,
NOT IMPLEMENTED, REJECTED,
INTERIM and CHANGED (changed).

The subunit type is provided to specify a function in the device.
recorder / player, tuner, etc. are assigned. In order to determine when there are a plurality of subunits of the same type, subunit
Addressing is performed with it id. opcode represents a command, and operand represents a parameter of the command. Additional operation
ands is a field added as needed.
The padding is also a field added as needed. dataCRC (Cyclic Redunda)
ncy Check) is used for error checking during data transmission.

FIG. 19 shows a specific example of the AV / C command. FIG. 19A shows ctype / response.
A specific example of se is shown. The upper part of the figure represents a command, and the lower part of the figure represents a response. "000
CONTROL for "0" and STATU for "0001"
S, "0010" is SPECIFIC INQUIR
NOTIFY is assigned to Y and “0011”, and GENERAL INQUIRY is assigned to “0100”. “0101 to 0111” are reserved and reserved for future specifications. "1000" has NOT I
NPLEMENTED, "1001" is ACCEPT
ED, “1010” has REJECTED, “101”
“1” is IN TRANSITION, “1100” is IMPLEMENTED / STABLE, “110”.
"1" is CHNGED, "1111" is INTERI
M has been assigned. “1110” is reserved and reserved for future specifications.

FIG. 19B shows a subunit type.
The example of e is shown. “00000” is Video
o Monitor, “00011” is Disk r
recorder / Player, "00100" is T
ape recorder / Player, "0010
“1” is Tuner and “00111” is VideoC
amera, "11100" has Vendor uni
que and “11110” have Subunit type
The extended to next byte is assigned. Note that a unit is assigned to “11111”, which is used when it is sent to the device itself, for example, power on / off.

FIG. 19C shows a specific example of the opcode. Opco for each subunit type
de table exists, and here, subunit
type is Tape recorder / Player
The opcode in the case of is shown. Also, opcode
Operand is defined for each e. here,
“00h” is VENDOR-DEPENDENT,
SEACHMODE for "50h", T for "51h"
IMECODE, ATN for "52h", OPEN MIC for "60h", READ MI for "61h"
C, WRITE MIC for "62h", LOAD MEDIUM for "C1h", RECORD for "C2h"
D, PLAY for "C3h", WIND for "C4h"
Is assigned.

FIG. 20 shows a specific example of an AV / C command and response. For example, when a playback instruction is given to a playback device as a target (consumer), the controller sends a command as shown in FIG. 20A to the target. Since this command uses the AV / C command set, CTS = "0000". c
The type includes a command (CO
NTTYPE), so ctype = “0000”
(See FIG. 19A). subunit
type is Tape recorder / Player
Therefore, the subunit type = “001”
00 ”(see FIG. 19B).
0 is shown, and id = 000. o
The pcode is "C3h" meaning reproduction (see FIG. 19C). Operand is FORWAR
It is “75h” meaning D. Then, when reproduced, the target returns a response as shown in FIG. 20 (B) to the controller. Here, since accepted indicating acceptance enters response, re
response = “1001” (FIG. 19)
(A)). Other than response, FIG.
Description is omitted because it is the same as (A).

Next, under the control using the AV / C command set described above, the system configuration shown in FIGS.
An example of processing for receiving a digital satellite broadcast and recording it on a recording medium (disk) by a disk recording / reproducing apparatus will be described.
Here, the channel from which audio data is obtained is I
When the received audio data is received by the RD 10 and the received audio data is recorded on the disk 56 by the disk recording / reproducing device 50, data accompanying the audio data is transmitted to the IR 56.
When the data is received and stored by the D10, the stored data is transmitted from the IRD 10 to the disk recording / reproducing apparatus 50 via the IEEE 1394 serial bus, and
Is recorded. As data accompanying the audio data, for example, still image data obtained by converting a jacket image as a title image into data,
There are text data such as lyrics, song titles, and explanations. Here, the still image data of the jacket image is
It is assumed that data is transmitted using the / C command. This still image data is, for example, JPEG (Joint Photo).
The data is compressed according to the OG (Operative Experts Group) method and transmitted in the asynchronous transfer mode.

Before describing the transmission state,
When transmission is performed using the V / C command set, the IRD 10 that is the source of data and the disk recording / reproducing device 50 that is the destination of data are devices having any function based on the AV / C command. This will be described with reference to FIG. When control is performed by an AV / C command, for example, as shown in FIG. 21A, one device connected to the IEEE 1394 serial bus 1 becomes the controller 2, and the controller 2 And the data receiving process in the device 4 as the data receiving destination. Here, the device 3 as the data transmission source is referred to as a producer, and the device 4 as the data reception destination is referred to as a consumer. Therefore, in the example shown in FIG.
10 becomes the producer 3 and the disk recording / reproducing device 5
0 becomes the consumer 4 and the transmission between the two devices 3 and 4 is I
It is controlled by a device 2 as another controller connected to the IEEE 1394 serial bus 1.

In the example of FIG. 21A, there is another device functioning as a controller, and when only two devices are connected to the bus 1, one of the devices is used. Share the function as a controller. That is, for example, as shown in FIG. 21B, the producer 3 ', which is the IRD 10, has a control function as a controller, and data is transmitted from the producer 3' to the consumer 4 under the control of the controller function in the producer 3 '. I do. Alternatively, for example, as shown in FIG. 21C, the consumer 4 ', which is the disk recording / reproducing apparatus 50, has a control function as a controller, and the producer 3 controls the consumer 4' under the control of the controller function in the consumer 4 '. ′.

In the example described below, as shown in FIG. 21B, when the IRD 10 also functions as a producer and a controller, transmission is performed when data is transmitted to a consumer which is the disk recording / reproducing apparatus 50. As a process. FIG. 22 is a diagram showing a transmission state in this case,
The left side is a producer and controller as the IRD 10 (here, this device is simply referred to as a producer), and the right side is a consumer as the disk recording / reproducing device 50.

When transmitting still image data from the producer, a process for establishing a connection for asynchronous transmission between the producer and the consumer is performed. That is, here, the ALLOCATE control is performed using the packet of the AV / C command already described with reference to FIG.
The l command is sent from the producer to the consumer (step S111). This command is a command for designating the address of the plug used for transmission at this time. The packet of the response to this command is
Send from the consumer to the producer (step S11
2). Then, ATTACH control cmm
And a packet is sent from the producer to the consumer (step S113). This command indicates that the setting of the plug has been completed. A packet of a response to this command is sent from the consumer to the producer (step S114). By the processing up to this point, a connection is established between the producer and the consumer, and a transmission path for asynchronous transmission for transmitting still image data is secured.

When the connection process is completed, the producer performs a process for controlling the operation of the consumer. That is,
The AV / C command packet includes an operating mode mode for controlling a disk recording / reproducing apparatus.
The data configuration of the info block is defined as shown in FIG. Specifically, data length, info block type, operating mode, data such as information about the operating mode is arranged, as an operating mode which is arranged in the address offset value 0006 16 _(hexadecimal number), for example mode shown in FIG. 24 Is prepared.

Operating mode shown in FIG.
Is explained in detail, the value OD ₁₆Is OBJECT
NUMBER SELECT is recorded on the recording medium.
A mode for instructing playback of a specific numbered object recorded
This OBJE mode is used for playback of still images.
Indicated by CT NUMBER SELECT. Value 5
0₁₆Is SHARK, and the mode instructing search is
Is. Value C2₁₆Is RECORD and records are
This is the mode to instruct. Value C3₁₆Is a PLAY
This is a mode for instructing playback. Value C5₁₆Is STOP
This is a mode for instructing a stop. This service
H, recording, playback, stop instructions, audio data, etc.
Search and record the main data recorded on the medium
It instructs recording, reproduction, stop, and the like.

The value 56 ₁₆ is RECORD OBJECT, which is a mode for instructing recording of an object. In this mode, an instruction to record an object such as a still image or text data on a medium is issued. Value C7
Reference numeral ₁₆ denotes REEARSAL, which is a mode for instructing rehearsal of an operation for editing or the like.

Returning to the description of FIG. 22, in the case of this example, when the connect processing is completed in step S114, the RECORD OBJ of the value 56 ₁₆ is set as the operating mode.
The producer sends a packet of the AV / C command specifying ECT (see FIG. 24) from the producer to the consumer (step S115). With this instruction, an instruction to record still image data on the disk 56 is issued. As a response packet to this command, an INTERIM response (see FIG. 19) indicating that the operation is performed according to the instruction is sent from the consumer to the producer (step S116).

When the recording instruction processing in steps S115 and S116 is completed, the data transmission size is notified. That is, the producer sends the CONTENT INFO data to the consumer in the control command packet of the AV / C command (step S117). The CONTENT INFO command is a command for notifying the details of the transmission data prepared at this time, and here, the data of the data size of the transmission data is notified. When the consumer receives the data relating to the data size of the transmission data, the consumer sends an ACCEPTED response indicating that the data has been received from the consumer to the producer (step S118).

Disc recording / reproducing device 5 which is a consumer
In the case of 0, when the data regarding the data size is received, processing such as securing an area for receiving and processing the data is performed to prepare for data reception.

After the transmission of the data relating to this data size, the producer IRD 10
Transmits the prepared still image data (that is, received and stored as broadcast data) to the disk recording / reproducing device 50 as a consumer (step S119). The process of transmitting the still image data in the asynchronous transfer mode is, for example, a process of transmitting the still image data in segments as shown in FIG. 29 described above.

When the transmission of one unit of data (one piece of still image data in this case) is completed, a disconnection process for releasing the connection between the producer and the consumer is performed. That is, DETACH control c
The command “mand” is sent from the producer to the consumer (step S120). This command is a command for releasing the plug connected at this time. A packet of a response to this command is sent from the consumer to the producer (step S121). Then, REL
The EASE control command packet is sent from the producer to the consumer (step S12).
2). This command is a command indicating that the release of the plug has been completed. A packet of a response to this command is sent from the consumer to the producer (step S123). By the processing so far, the connection between the producer and the consumer is released.

Thus, the disk recording / reproducing device 50
FIG. 25 shows an example of a state in which data is recorded on the disk 56 by using. The recording area of the disk 56 here is an area divided into units called clusters. In addition to the power control area of the pickup, the area of the index data, the main data (audio data), and the auxiliary data (Aux Data). 2.) A predetermined number of clusters are prepared in an area, and still image data is recorded as one object in the area.

Next, an example of processing for instructing reproduction of the still image data recorded on the disk in this manner will be described with reference to FIG.

In this case, the disk recording / reproducing device 50
Is the data source, so it becomes the producer and the IR
Since D10 is a data receiving source, it is a consumer.
The function of the controller is the consumer IRD
10 (that is, the configuration of FIG. 21C). First, processing for establishing a connection for asynchronous transmission between the producer and the consumer is performed. That is, similar to the example shown in FIG. 22, ALLOCATE control is used.
The command is sent from the consumer to the producer (step S111). This command is a command for designating the address of the plug used for transmission at this time. A packet of a response to this command is sent from the producer to the consumer (step S11).
2). Then, ATTACH control cmm
And the packet is sent from the consumer to the producer (step S113). This command indicates that the setting of the plug has been completed. A packet of a response to this command is sent from the producer to the consumer (step S114), and a connection is established between the producer and the consumer.

[0084] When the connect process is completed, OBJECT of value OD ₁₆ as the operating mode NUM
The BER SELECT packet is transmitted from the consumer to the producer (step S131). This mode is a mode for instructing reproduction of an object of a specific number recorded on a recording medium (disk), and here, instructing reproduction of still image data recorded on the disk.

When this reproduction is instructed, an INTERIM response indicating that the reproduction instruction has been acknowledged (FIG. 1)
9) is sent from the producer to the consumer (step S132). After the end of the reproduction instruction processing, the data transmission size is notified. That is, here, the control command packet of the AV / C command is
The producer sends the ENT INFO STATUS data to the consumer (step S133). This CO
The NTENT INFO STATUS command is a command for inquiring about the details of the transmission data prepared at this time. Here, the data size of the transmission data is inquired. When this data is received by the producer, a response to the data (ie, data relating to the data size of the corresponding still image data) is sent from the producer to the consumer as a response (step S).
134).

Upon receiving the data relating to the data size, the consumer IRD 10 performs processing such as securing an area for receiving and processing the data, and prepares for data reception.

After the transmission of the data relating to the data size, the disk recording / reproducing device 50 as the producer reproduces the still image data recorded on the disk and transmits it to the IRD 10 as the consumer (step). S135). The process of transmitting the still image data in the asynchronous transfer mode is, for example, a process of transmitting the still image data in segments as shown in FIG. 29 described above.

When the transmission of one unit of data (one piece of still image data in this case) is completed, a disconnection process for releasing the connection between the producer and the consumer is performed. That is, DETACH control c
The command "mand" is sent from the consumer to the producer (step S120). This command is a command for releasing the plug connected at this time. A packet of a response to this command is sent from the producer to the consumer (step S121). Then, REL
An EASE control command packet is sent (step S122). This command is a command indicating that the release of the plug has been completed. A packet of a response to this command is sent (step S1).
23), the connection between the producer and the consumer will be released.

As described above, when transmitting still image data or the like in the asynchronous transfer mode, the data size is notified in advance. Before reception, it is possible to prevent the occurrence of an error by appropriately selecting a reception buffer area or the like or receiving data of a size that cannot be received.

Note that the processing described so far is an example of processing when a function as a controller is built in a device as a producer or a consumer.
The present invention can be applied to a case where the controller is another device connected to the bus as shown in FIG. FIG. 27 shows a processing example in this case.

The process will be described. First, a process for establishing a connection for asynchronous transmission between a producer and a consumer is performed under the control of the controller. That is, here, using the packet of the AV / C command,
Allocate control command is sent from the controller to the consumer (step S20)
1). This command is a command for designating the address of the plug used for transmission at this time. A packet of a response to this command is sent from the consumer to the controller (step S202). Next, ALL
OCATE ATTACH control cmma
nd is sent from the controller to the producer (step S203). This command is a command for notifying the address of the plug used for transmission at this time and notifying the address of the plug set to the consumer.
A packet of a response to this command is sent from the producer to the controller (step S204).
Then, ATTACH control command
Is sent from the controller to the consumer (step S205). This command indicates that the setting of the plug has been completed. A packet of a response to this command is sent from the consumer to the controller (step S206). By the processing so far, a connection is established between the producer and the consumer under the control of the controller, and a transmission path for asynchronous transmission for transmitting still image data is secured.

When the connection processing is completed, the producer performs processing for controlling the operation of the consumer. That is,
RECORD with value 56 ₁₆ as operating mode
An AV / C command packet specifying OBJECT (see FIG. 24) is sent from the producer to the consumer (step S207). With this instruction, an instruction to record still image data on the disk 56 is issued. As a response packet to this command, an INTERIM response (see FIG. 19) indicating that the operation is performed according to the instruction is sent from the consumer to the producer (step S208).

When the recording instruction processing in steps S207 and S208 is completed, the data transmission size is notified. That is, STAT is sent from the controller to the producer.
UScommand is sent (step S209), and the data size of the still image data to be transmitted is inquired. When the producer receives this command, the producer sends a response to which data on the data size is added to the controller (step S210). When this data is received by the controller, a control command packet is sent from the controller to the consumer (step S211). Data relating to the data size is added to this packet. And
A packet of a response to this command is sent from the consumer to the controller (step S212).

After the transmission of the data relating to this data size, the producer IRD 10
Transmits the prepared still image data to the disk recording / reproducing device 50, which is a consumer (step S21).
3). Then, when the transmission of one unit of data (here, one piece of still image data) is completed, a disconnection process for releasing the connection between the producer and the consumer is performed. That is, DETACH control cmma
nd from the controller to the consumer (step S
214). This command is a command for releasing the plug connected at this time. A packet of a response to this command is sent from the consumer to the controller (step S215). Also, DETACH
Send RELEASE control command from the controller to the producer (step S21)
6), the packet of the response to this command is
Send from the producer to the controller (step S21
7). Then, RELEASE control cmm
An AND packet is sent from the controller to the consumer (step S218), and a response packet to this command is sent from the consumer to the controller (step S219). By the processing so far, the connection between the producer and the consumer is released.

As described above, when the controller is a separate device, by transmitting data relating to the data size via the controller, the consumer can confirm the data size.

[0096] Even when the controller is a separate device, data relating to the data size may be directly exchanged between the producer and the consumer. FIG. 28 is a diagram showing an example in this case.
First, under the control of the controller, processing for establishing a connection for asynchronous transmission between the producer and the consumer is performed. That is, here, using the packet of the AV / C command, ALLOCATE control cmma
nd from the controller to the consumer (step S
301). This command is a command for designating the address of the plug used for transmission at this time. A packet of a response to this command is sent from the consumer to the controller (step S302). Next, A
LLOCATE ATTACH control cm
The command is sent from the controller to the producer (step S303). This command is a command for notifying the address of the plug used for transmission at this time and notifying the address of the plug set to the consumer. A packet of a response to this command is sent from the producer to the controller (step S30).
4). Then, ATTACH control cmm
The and packet is sent from the controller to the consumer (step S305). This command indicates that the setting of the plug has been completed. A packet of a response to this command is sent from the consumer to the controller (step S306). By the processing so far, a connection is established between the producer and the consumer under the control of the controller, and a transmission path for asynchronous transmission for transmitting still image data is secured.

When the connection process is completed, the producer performs a process for controlling the operation of the consumer. That is,
RECORD with value 56 ₁₆ as operating mode
A packet of an AV / C command specifying OBJECT (see FIG. 24) is sent from the producer to the consumer (step S307). With this instruction, an instruction to record still image data on the disk 56 is issued. As a response packet to this command, an INTERIM response (see FIG. 19) indicating that the operation is performed according to the instruction is sent from the consumer to the producer (step S308).

When the recording instruction processing in steps S307 and S308 is completed, the data transmission size is notified next. That is, here, the STATUS command is sent directly from the consumer to the producer (step S).
309) Inquire about the data size of the still image data to be transmitted. When this command is received by the producer, a response to which data relating to the data size is added is sent from the producer to the consumer (step S
310).

After the transmission of the data relating to this data size, the producer IRD 10
Transmits the prepared still image data to the disk recording / reproducing device 50, which is a consumer (step S31).
1). Then, when the transmission of one unit of data (here, one piece of still image data) is completed, a disconnection process for releasing the connection between the producer and the consumer is performed. That is, DETACH control cmma
nd from the controller to the consumer (step S
3122. This command is a command for releasing the plug connected at this time. A packet of a response to this command is sent from the consumer to the controller (step S312). Also, DETACH
RELEASE control command is sent from the controller to the producer (step S31).
4), the packet of the response to this command is
Send from the producer to the controller (step S31
5). Then, RELEASE control cmm
An AND packet is sent from the controller to the consumer (step S316), and a response packet to this command is sent from the consumer to the controller (step S317). By the processing so far, the connection between the producer and the consumer is released.

Thus, even when the controller is a separate device, the data size can be confirmed by direct data transmission between the producer and the consumer.

Here, FIG. 22, FIG. 26, FIG. 27, FIG.
In each of the transmission examples shown in FIG. 1, specific examples of commands and responses to be transmitted will be described. FIG. 29 shows an AV / C packet used in the asynchronous connection. [Opcode] and [op
erand (0)] to [operand (20)] are arranged and transmitted in the corresponding sections of the packet shown in FIG. [Opcode]
Is set to a value indicating an asynchronous connection. As the data after [operand (0)], the function at the time of the control command is specified in the subfunction section. In the status (ststus) section, a port status or an error code is returned at the time of response. Plug ID (plug
In the section of id), a unit plug as a command target is shown. Plug off
In the section of (set), the offset address value of the asynchronous plug is indicated in the response. In the section of the port ID (port id), a port to which a command is applied is indicated. Port bit (portbit
In the section of s), the function supported by the port is indicated in the response. Connected node ID (co
In the section of “nconnected node id”, the node ID of the connection destination device is indicated. Connected plug offset
In the section t), the offset address of the plug to be connected is indicated. Connected port ID (connect
In the section of (ed port ID), the port of the connection destination is indicated. Connected port bit (connect
In the section of “ed portbits”, functions supported by the connection destination port are shown. Connected plug I
In the section of D (connected plug ID), a unit plug to be connected is indicated. In the section ex, an exclusive connection is specified. In a state where the exclusive connection is specified, an asynchronous connection AV / C command issued by a controller other than the controller that established the connection is not accepted. In the section of the connection count (connection count), the response indicates the number of times a connection targeted by the command is established (the number of overlays). Write interval
val), a write request (write re) issued by the producer when transmitting a segment
quest) is indicated. In the section of the retry count (retry count), the maximum number of retries of the write request issued when the producer transmits the segment is indicated.

Next, an example of data arranged in each section of the packet used in the asynchronous connection configured as described above will be described. FIG. 30 is a diagram showing a configuration example of an allocate command and a response to the allocate command transmitted to the consumer when establishing a connection.
In FIG. 30, the left side shows the data structure of the command, and the right side shows the data structure of the response. A field indicated by an arrow in the response indicates that the command data is returned as it is. The same applies to the case of FIG. 31 and subsequent figures. By transmitting the allocate command shown in FIG. 30 and obtaining the response from the consumer, the plug / port of the consumer used for transmission can be temporarily reserved and the offset address of the plug can be obtained. Steps S111 and S112 in FIG. 22, steps S111 and S112 in FIG. 26, steps S201 and S202 in FIG. 27, and steps S301 and S302 in FIG. Is transmitted.

FIG. 31 is a diagram showing a configuration example of an allocate attach command and its response transmitted to the producer when establishing a connection. By transmitting the allocate attach command shown in FIG. 31, the plug / port of the producer used for transmission can be secured, and the offset address of the plug can be obtained. Steps S203 and S204 in FIG. 27 and FIG.
In step S304 and step S305 of FIG. 8, the allocate attach command and response having such a data structure are transmitted.

FIG. 32 is a diagram showing an example of the structure of an attach command and its response transmitted to a consumer when a connection is established. By transmitting the attach command shown in FIG. 32 and obtaining a response from the consumer, a plug / port of the consumer used for transmission can be secured, and information on the port of the producer to be connected can be transmitted to the consumer. FIG.
In steps S113 and S114 of FIG. 26, steps S113 and S114 of FIG. 26, steps S205 and S206 of FIG. 27, and steps S305 and S306 of FIG. Is done.

After the connection process is completed with the commands and responses up to this point, the data shown in FIG. 33 is placed in [opcode] and [operand] for the object number select control command for giving a reproduction instruction. That is, a value indicating the object number select,
A source plug, a subfunction, a status, data for selecting an object number, and data specific to the selected object number are arranged. In step S131 in FIG. 26, a control command for object number select having such a data structure is transmitted.

The control command of the record object for instructing the recording includes the data shown in FIG.
de] and [operand]. That is, a value indicating a record object, a result, a sub-function, a destination plug, an object position, and a destination list ID are arranged. In step S115 of FIG. 22, step S207 of FIG. 27, and step S307 of FIG. 28, the control command of the object number select having such a data structure is transmitted.

As for the status command of the connect information for notifying the data size, the data shown in FIG. 35 is arranged in [opcode] and [operand]. Here, it is defined as a data structure of a vendor dependent (device manufacturer specific), a value indicating the vendor dependent, a company ID, information about the vendor dependent, connect information, and a descriptor type. , A list ID, an object position, a content type, and information specific to the content type are arranged.

The information specific to the content type has, for example, the data structure shown in FIG. 36 when the content type is JPEG video data (still image data). Here, the copy restriction of the content is indicated by the clip copy status, and the data size of the video data to be transmitted is indicated by the content size. The data is used to notify the data transmission size to the other party. Also, data relating to the image mode and the image format are arranged.

FIG. 37 shows another example of information specific to the content type. In this example, the content type is text data.
Here, the copy restriction of the content is indicated by the clip copy status, and the data size of the transmitted text data is indicated by the content size. The data is used to notify the data transmission size to the other party. In addition, data relating to a character code, a file format, and a text content type are arranged.

Next, an example of data transmitted at the time of disconnection for releasing a connection will be described. FIG.
FIG. 8 is a diagram illustrating a configuration example of a detach command and a response to the detach command transmitted to the consumer when the connection is released. By transmitting the detach command shown in FIG. 38 and obtaining the response from the consumer, the operation of the plug / port of the designated consumer is stopped. Step S120 and Step S in FIG.
121 and steps S120 and S1 in FIG.
21 and steps S214 and S21 in FIG.
5, step S312 and step S313 in FIG.
In this case, the detach command and response having such a data structure are transmitted.

FIG. 39 is a diagram showing a configuration example of a detach release command transmitted to the producer when the connection is released and a response thereto. By transmitting the detach release command shown in FIG. 39, the operation of the plug / port of the designated producer can be stopped and the disconnection can be performed. In steps S216 and S217 in FIG. 27 and steps S314 and S315 in FIG. 28, the detach release command and the response having such a data structure are transmitted.

FIG. 40 is a diagram showing a configuration example of a release command and a response to the release command transmitted to the consumer when the connection is released. By transmitting the release command shown in FIG. 40 and obtaining the response from the consumer, the plug / port of the designated consumer can be disconnected. FIG.
In step S122 and step S123 of FIG. 26, step S122 and step S123 of FIG. 26, step S218 and step S219 of FIG. 27, and step S316 and step S317 of FIG. Is done.

In the embodiment described so far,
When transmitting still image data, the data size of the data is checked.However, when transmitting other data such as text data, the data related to the data size is similarly transmitted in advance and checked. You may do it. As described above, in the case of still image data, the data structure at the time of notification of the data size has the configuration shown in FIG. 36. In the case of text data, for example, the notification of the data size is performed. The data structure at the time of
The configuration is as shown in FIG.

In the above-described example, the status command for notifying the data size is set as a data structure specific to the manufacturer. However, a command common to each manufacturer may be defined.

In the above-described embodiment, the data size is checked when transmitting in the isochronous transfer mode. However, when transmitting in the asynchronous transfer mode, the data size is determined in advance. Alternatively, data of the data size may be transmitted after the connection is established and before data transmission is started.

Further, in the above-described embodiment, the IEEE
Although the case of the network configured by the 1394 bus has been described, the present invention can be applied to a case where similar data transmission is performed between devices having other network configurations.

Further, in the above-described embodiment, the function for performing the above-described processing is set in each device. The user may install the program stored in the medium on a computer device or the like to execute the same function. In this case, the providing medium may be a physical recording medium such as an optical disk or a magnetic disk, or a medium provided to the user via a communication means such as the Internet.

[0118]

According to the transmission method described in claim 1,
On the receiving device connected to the network, the data size to be transmitted can be confirmed before data transmission starts, and processing suitable for the data size transmitted by the receiving device is set in advance. This makes it possible to execute appropriate processing suitable for the size of data to be transmitted.

According to the transmission method described in claim 2, in the invention described in claim 1, the processing for securing at least an area for temporarily storing the transmitted data based on the data relating to the data size is performed. By doing
It is sufficient to secure only an area for storing data of the data size, and as a process of setting a storage area for received data,
It is not necessary to secure an area having a size larger than necessary.

According to the transmission method described in claim 3, in the invention described in claim 1, by transmitting data by asynchronous transfer, the notification of the size and the transmission of data can be respectively executed well.

According to the transmission method described in claim 4, in the invention described in claim 1, the connection establishment step is performed by the data transmitting device, so that the establishment of the connection and the notification of the data size are performed in a series. Can be executed under the control of.

According to the transmission method described in claim 5, in the invention described in claim 1, the connection establishment step is performed by another control device, so that the connection is established under the control of another control device and the data is established. Will be able to check the data size.

According to the transmission method described in claim 6, in the invention described in claim 5, the data relating to the data size is also transmitted to the receiving-side device by relaying the control device, thereby controlling the control device. Thus, data relating to the data size can be transmitted well.

According to the transmission method described in claim 7, in the invention described in claim 1, execution of the data size transmission step is started by a request from the receiving side device, so that the receiving side device executes the data size transmitting step. When a data size is required, the corresponding data is received.

According to the transmission method described in claim 8, in the invention described in claim 1, the disconnection after the data transmission prevents the connection from being left unconnected after the data transmission. Devices can use the transmission band efficiently.

According to the electronic device of the ninth aspect, the data size to be transmitted can be confirmed before data transmission is started, and processing suitable for the data size to be transmitted can be set in advance. It becomes possible.

According to the electronic device of the tenth aspect,
According to the ninth aspect of the present invention, the data size can be confirmed by the control means by directly communicating with the device that sends out the data, so that the data size can be confirmed with a small amount of processing that does not pass through another device. Become like

According to the electronic device described in claim 11,
According to the ninth aspect of the present invention, the storage area securing unit detects the presence of at least the area for temporarily storing the data to be transmitted based on the data regarding the data size. It is sufficient to secure only the area for storing the data of the size, it is not necessary to secure the area of the size larger than necessary,
An efficient storage area securing process can be performed.

According to the electronic device of the twelfth aspect,
In the invention according to the eleventh aspect, by providing recording medium means for recording data and recording means for recording data stored in the area secured by the storage area securing means on the recording medium means, the received data can be temporarily stored. Recording on a recording medium after storage can be performed efficiently.

According to the electronic device of the thirteenth aspect,
According to the ninth aspect of the present invention, by transmitting information on the detected data size to another device, another device on the network can detect the data size by controlling this device.

According to the electronic device of the present invention,
According to the thirteenth aspect, by transmitting the data by the asynchronous transfer, the data related to the data size can be efficiently transmitted by the asynchronous transfer.

By executing the program provided by the providing medium according to the fifteenth aspect, the size of the data to be transmitted can be confirmed before the data transmission is started by the receiving device connected to the network. Like
Processing suitable for the data size transmitted by the receiving device can be set in advance, and appropriate processing suitable for the data size transmitted can be executed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of an entire system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an example of an internal configuration of an IRD and a disk recording / reproducing device according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an example of a cycle structure of data transmission on an IEEE 1394 bus.

FIG. 4 is an explanatory diagram showing an example of a structure of an address space of a CRS architecture.

FIG. 5 is an explanatory diagram showing an example of positions, names, and functions of main CRSs.

FIG. 6 is an explanatory diagram showing an example of a general ROM format.

FIG. 7: Bus info block, root directory,
FIG. 4 is an explanatory diagram illustrating an example of a unit directory.

FIG. 8 is an explanatory diagram illustrating an example of a configuration of a PCR.

FIG. 9 is an explanatory diagram showing an example of the configuration of oMPR, oPCR, iMPR, and iPCR.

FIG. 10 is an explanatory diagram showing an example of the relationship between a plug, a plug control register, and a transmission channel.

FIG. 11 is an explanatory diagram showing an example of a data structure based on a hierarchical structure of a descriptor.

FIG. 12 is an explanatory diagram illustrating an example of a data format of a descriptor.

FIG. 13 is an explanatory diagram showing an example of a generation ID in FIG. 12;

FIG. 14 is an explanatory diagram showing an example of a list ID in FIG. 12;

FIG. 15 is an explanatory diagram showing an example of a stack model of an AV / C command.

FIG. 16 is an explanatory diagram showing the relationship between FCP commands and responses.

17 is an explanatory diagram showing the relationship between the command and the response in FIG. 16 in more detail;

FIG. 18 is an explanatory diagram showing an example of a data structure of an AV / C command.

FIG. 19 is an explanatory diagram showing a specific example of an AV / C command.

FIG. 20 is an explanatory diagram showing a specific example of a command and a response of an AV / C command.

FIG. 21 is an explanatory diagram illustrating an example of a device form according to each embodiment of the present invention.

FIG. 22 is an explanatory diagram illustrating an example of a transmission state according to an embodiment of the present invention.

FIG. 23 is an explanatory diagram showing an example of an operating mode info block.

FIG. 24 is an explanatory diagram illustrating an example of an operating mode.

FIG. 25 is an explanatory diagram showing an example of data recording on a disc.

FIG. 26 is an explanatory diagram illustrating an example of another transmission state according to an embodiment of the present invention.

FIG. 27 is an explanatory diagram showing an example of a transmission state according to another embodiment of the present invention.

FIG. 28 is an explanatory diagram showing an example of a transmission state according to still another embodiment of the present invention.

FIG. 29 is an explanatory diagram showing an example of an asynchronous connection setting packet.

FIG. 30 is an explanatory diagram showing an example of an allocate command and a response.

FIG. 31 is an explanatory diagram showing an example of an allocate attach command and a response.

FIG. 32 is an explanatory diagram showing an example of an attach command and a response.

FIG. 33 is an explanatory diagram showing an example of an object number select control command.

FIG. 34 is an explanatory diagram showing an example of a record object control command.

FIG. 35 is an explanatory diagram showing an example of a connect information control command.

FIG. 36 shows an example of data specific to a content type (Example 1)
FIG.

FIG. 37 shows an example of data specific to a content type (Example 2)
FIG.

FIG. 38 is an explanatory diagram illustrating an example of a detach command and a response.

FIG. 39 is an explanatory diagram illustrating an example of a detach release command and a response.

FIG. 40 is an explanatory diagram illustrating an example of a release command and a response.

FIG. 41 is an explanatory diagram showing an example of a data state in the asynchronous transfer mode.

[Explanation of symbols]

10 IRD (Digital Satellite Broadcasting Receiver), 11 Tuner, 12 Front End Unit, 13 Descramble Circuit, 14 Demultiplexer, 15 MPEG Video Decoder, 16 MPEG Audio Decoder, 17
... NTSC encoder, 18 ... Digital to analog converter, 19 ... Digital to analog converter, 20 ... CP
U, 21 RAM, 22 work RAM, 23 operation panel, 24 IEEE 1394 interface, 26
... Cables constituting an IEEE 1394 bus
7 Cable, 40 Monitor, 50 Disk recording / reproducing device, 51 Interface, 52 CPU, 52A
... RAM, 53 ATTRACK encoder, 54 recording and reproducing system, 55 optical pickup, 56 magneto-optical disk (optical disk), 57 ATRAC decoder, 58 analog-digital conversion circuit, 59 digital-analog conversion circuit, 61 amplifier Device, 61L ... speaker, 61
R speaker, 81 physical layer, 82 link layer, 83 transaction layer, 84 serious bus management, 85 FCP, 86 AV / C command set, 91 command register, 92 response register, 93 command Register, 94 ... Response register

Claims (15)

[Claims] 1. A transmission method for transmitting data between devices connected to a predetermined network, comprising the steps of: transmitting data between a first device and a second device connected to the network; A connection establishing step of establishing a connection of the first device, a data size transmitting process of transmitting data relating to a data size transmitted from the first device to the second device from the first device, A data transmission step of starting data transmission from the first device to the second device. 2. The transmission method according to claim 1, further comprising: a storage area securing step for securing at least an area for temporarily storing data transmitted in the data transmission step based on the data regarding the data size. Further having transmission method. 3. The transmission method according to claim 1, wherein in the data transmission step, the data is transmitted by asynchronous transfer. 4. The transmission method according to claim 1, wherein, in the connection establishing step, the first device connected to the network establishes the connection. 5. The transmission method according to claim 1, wherein, in the connection establishing step, a third device connected to the network establishes the connection. 6. The transmission method according to claim 5, wherein the data relating to the data size is transmitted from the first device to the third device, and then transmitted from the third device to the second device. Transmission method to do. 7. The transmission method according to claim 1, wherein the data size transmission step starts to be executed in response to a request from the second device to the first device. 8. The transmission method according to claim 1, further comprising a disconnection step of disconnecting a connection established between said first device and said second device after said data transmission process. . 9. An electronic device connected to a predetermined network, comprising: an input / output means for exchanging data with the other device by establishing a connection with the other device connected to the network; Control means for detecting a data size of data transmitted to and from another device. 10. The electronic device according to claim 9, wherein the detection of the data size by the control means is performed by communicating with the other device that transmits data. 11. The electronic device according to claim 9, further comprising a storage area securing unit that secures an area for temporarily storing data based on the detected data size. 12. The electronic device according to claim 11, further comprising: recording media means for recording data; and recording means for recording data stored in the area on the recording media means. 13. The electronic device according to claim 9, further comprising a data size transmitting unit that transmits information on the data size detected by the control unit to the another device. 14. The electronic device according to claim 13, wherein said data transmission means transmits said data by asynchronous transfer. 15. A providing medium for providing a program for controlling communication performed between devices connected to a predetermined network, comprising: a communication device configured to perform communication between a first device and a second device connected to the network; When performing the process, a process for establishing a connection between the plug of the first device and the plug of the second device, and data relating to the data size transmitted from the first device are transmitted from the first device to the first device. A providing medium for providing a program for performing processing to be transmitted to the second device;