JP2002033751A - Electronic device, electronic device management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the user-friendliness of a system, consisting of devices interconnected by a data bus. SOLUTION: A Node ID sequence node table, where devices existing on a data bus at present are managed on the basis of node ID, is divided into groups, and an input selection sequence node table to manage the devices according to a prescribed device selection sequence is generated according to the result of grouping. Thus, in the system, consisting of external electronic devices existing on the data bus and of an electronic device of this invention, for example the electronic device of this invention realizes a specific systematic operation not according to the device ID sequence, but according to the device type sequence which fit in its purposes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device which can be communicably connected to another device via a data bus in a predetermined communication format, and to which the electronic device is connected via the data bus. The present invention relates to an electronic device management method for managing external electronic devices.

[0002]

2. Description of the Related Art In recent years, an IEEE (Institute of Electrical Engineer) has been used as a digital data interface.
s) 1394 data interfaces have become known. The IEEE 1394 data interface has a higher data transfer rate than, for example, SCSI.
As is well known, Isochronous communication that ensures that a required data size is periodically transmitted and received is enabled. For this reason, the IEEE 1394 data interface is advantageous for transferring stream data such as AV (Audio / Video) in real time.

[0003] Against this background, electronic devices such as various digital AV devices and personal computer devices are connected to each other via a data bus conforming to a data interface standard such as IEEE 1394, so that the devices can be connected to each other. AV that can send and receive AV data
Systems have been proposed.

The above-mentioned AV system mainly includes, for example, an amplifier device and a CD player, an M
Various A such as D recorder / player and video equipment
By connecting V source output devices via a data bus, for example, it is conceivable to construct a so-called component system.

[0005] The role of the amplifier device in such an AV system is to input AV source information transmitted from the AV source output device via the data bus and finally output it as an audio signal to a speaker or the like. become. For this reason, as the amplifier device, for example, from a plurality of AV source output devices existing on the data bus,
It has a function for selectively inputting one AV source output device. That is, it has an input source selection function. This is achieved, for example, by establishing a logical interconnection relationship on the data bus with the AV source output device specified by the selection operation in response to the input source selection operation performed on the amplifier device by the user. Is achieved.

[0006]

Now, let us consider a case where the selection of an input source for an AV source output device connected via a data bus is performed by an amplifier device as described above. For example, in a conventional audio system, since a plurality of source input / output terminals are provided for an amplifier device, the selection of the source input / output terminals is switched according to a selection operation. I was In contrast, as in the case above,
When the amplifier device and the AV source output device are connected via a data bus, it is necessary to switch the selection of the input source by logical processing according to the input operation.

As one of the methods for realizing the input selection by the logical processing as described above, IEEE 13
For a 94 data interface, Node
-ID may be used. As is well known, the Node-ID is an ID that is uniquely assigned to each device that is presently present on the data bus and that is dynamically changed every time the bus is reset. The bus reset is a process that is executed when a device on the data bus is changed by, for example, inserting or removing a device on the data bus or turning on / off a power supply of a certain device.

For example, in an amplifier device, information of an AV source device obtained at each bus reset is managed by a Node-ID.
The selection is made in the order of the Node-ID. Specifically, for example, the input selection is performed by a toggle operation, and every time the toggle operation is performed, the selection of the source input is switched according to the Node-ID order. IEEE 1394
In the data interface, control of a system configured by connecting a plurality of devices via a data bus is usually performed using the Node-ID, and therefore, is controlled based on the Node-ID as described above. The input selection order can be easily realized.

However, as described above, Node-I
When switching the input source according to the D order,
The following inconveniences occur. For example, in an AV system or the like, even if a plurality of devices are connected, devices that are frequently used by users are often limited. Therefore, as a user, the order of selecting input sources is as follows:
It is preferable that the order corresponds to such a use frequency to some extent. However, Node-ID
Is assigned to each device with contingency at the time of bus reset, and therefore, the order of Node-ID does not correspond to the order of devices according to the frequency of use by the user. Also, since the Node-ID changes dynamically between electronic devices every time a bus reset occurs, the input selection order changes each time a bus reset occurs. Thus, there is a problem in that the selection order of the input sources according to the Node-ID order becomes inconvenient for the user.

[0010]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention easily realizes a specific system operation such as a case where an input is selected in a system connected via a data bus. Therefore, it is an object of the present invention to enable management according to the order of required device types.

[0011] For this reason, by being connected via a data bus of a predetermined communication format, it is possible to communicate with one or more external electronic devices existing on the data bus, thereby forming an electronic device forming a communication system. The following configuration was adopted. In other words, external electronic devices currently on the data bus are managed based on the device ID assigned to each electronic device currently on the data bus, and each external electronic device currently on the data bus is managed. Classifying means for classifying device information for each predetermined device type set in advance with respect to device table information comprising a set of device information having information of predetermined contents for a specific purpose based on a classification result by the classifying device; And information reorganization means for reorganizing the device table information so that the management is performed according to the device type order set in advance in accordance with the information.

[0012] Further, by connecting via a data bus in a predetermined communication format, it is possible to communicate with one or more external electronic devices existing on the data bus, thereby forming an electronic device forming a communication system. An electronic device management method for managing external electronic devices is configured as follows. In other words, external electronic devices currently on the data bus are managed based on the device ID assigned to each electronic device currently on the data bus, and each external electronic device currently on the data bus is managed. With respect to device table information composed of a set of device information having information of predetermined contents, a classification procedure for classifying the device information for each predetermined device type set in advance, and a specific The information reorganization procedure for reorganizing the device table information is configured to be executable so that the management is performed according to the device type order set in advance according to the purpose.

According to each of the above configurations, the device table information managed on the basis of the device ID assigned to each electronic device currently present on the data bus is finally set in advance according to a specific purpose. The reorganization is performed so that the management is performed according to the order of the device types. This means that, in other words, it becomes possible to execute a process for realizing the specific purpose based on the rearranged device table information.

[0014]

Embodiments of the present invention will be described below. The following description will be made in the following order. 1. AV system 1-1. Overall configuration 1-2. STR (front panel) 1-3. CD machine (front panel) 1-4. MD machine (front panel) 1-5. STR (internal) 1-6. CD machine (internal) 1-7. 1. MD machine (inside) Data Communication According to IEEE 1394 According to Embodiment 2-1. Overview 2-2. Stack model 2-3. Signal transmission form 2-4. Bus connection between devices 2-5. Packet 2-6. Transaction rules 2-7. Addressing 2-8. CIP (Common Isochronous Packet) 2-9. Connection management 2-10. Commands and responses in FCP 2-11. AV / C command packet 2-12. Plug 2-13. 2. Asynchronous Connection transmission procedure 3. Node classification processing Input selection order node table 4-1. Input selection order 4-2. Outline of input selection order node table creation processing 4-3. Processing operation

1. AV system 1-1. 1. Overall Configuration FIG. 1 shows a configuration example of an electronic device system according to an embodiment of the present invention. The electronic device system according to the present embodiment is constructed by connecting a plurality of AV devices and the like so as to be able to communicate with each other via a data bus of an IEEE 1394 interface.

In FIG. 1, STR (Stereo Tuner Receiver) 60 and 2
One STR-compatible CD machine 30, 30, the STR-compatible MD machine 1, the same maker device 100, and another manufacturer's device 110 are shown.

The STR 60 functions as the center of the AV system shown in FIG. 1, and mainly has a tuner function, an external source input selection function, and an amplifier function.
For example, as shown in the figure, left and right channel speakers SP (L) (R) corresponding to stereo sound can be connected. Although the detailed configuration will be described later, ST
In R60, the broadcast signal received by the internal tuner unit,
Analog audio signal input and IEEE 139
A plurality of audio sources input from the outside via the four buses 116 are selected, and finally, the selected audio sources can be output as sounds from the speakers SP (L) (R).

FIG. 2 also shows a remote controller RM for operating the STR 60. The STR 60 receives an operation command signal transmitted in response to an operation performed on the remote controller RM, and performs a required operation according to the content of the operation command signal. Note that, although only the remote controller RM corresponding to the STR 60 is shown in this figure, in practice, other devices may be operated by the remote controller.

Further, as a model capable of realizing various system functions with high convenience by being connected together with the STR 60, the STR-compatible CD machine 30 and the ST
An R-compatible MD machine 1 is shown. STR compatible CD machine 3
The STR compatible MD machine 1 is, for example, the same manufacturer as the STR 60.

The STR-compatible CD unit 30 is a CD (Compact D)
isc) has a function as a player, and the loaded C
Playback for D is performed. Then, audio data obtained by reproducing from the CD is transferred to the IEEE 1394 bus 11.
6 can be transmitted and output. Also, S
The TR-compatible MD machine 1 is an MD recorder / player that can perform recording and reproduction corresponding to a magneto-optical disk capable of rewriting audio data called an MD (Mini Disc). And in this STR-compatible MD machine 1,
Audio data transmitted via the IEEE 1394 bus 116 can be received and recorded on the MD. Further, audio data recorded on the MD can be reproduced and transmitted and output via the IEEE 1394 bus 116.

The STR 60, STR-compatible CD machine 30,
And the typical system operation obtained by the three STR-compatible MD machines 1 is as follows.
For example, by transmitting the audio data of the CD being reproduced by the STR-compatible CD device 30 to the STR-compatible MD device 1, the STR-compatible MD device 1 records the CD audio data on the MD. Can be. That is, so-called dubbing can be performed. At this time, the audio data of the CD being reproduced by the STR-compatible CD machine 30 or the audio data of the CD once received by the STR-compatible MD
If you also send to R60, this CD
Speaker SP using the audio data of the
(L) and (R) can be output.

Although detailed description is omitted here,
The STR compatible CD machine 30 and the STR compatible MD machine 1
A variety of so-called audio component system functions centered at 60 are provided to be specially provided. For example, when dubbing from the STR-compatible CD machine 30 to the STR-compatible MD machine 1 is taken as an example, the recording start / end timing in the STR-compatible MD machine 1 is synchronized with the double speed dubbing operation and the CD playback start / end timing. , That is, a so-called sync / dubbing operation can be easily executed.

The same maker device 100 has STR60, S
This is a digital AV device that is made by the same manufacturer as the TR-compatible CD device 30 and the STR-compatible MD device 1 and has a communication function compatible with the IEEE1394 interface. Although there is no particular mention of the actual equipment 100 of the same maker here, for example, a CD player, an MD recorder / player, a digital VTR, or the like may be used. As the same manufacturer device 100, for example, STR compatible C
When compared with the D machine 30 and the STR-compatible MD machine 1, etc., it is different in that it is not particularly configured to provide a system component function centering on the STR 60. However, commands (Ve
STR60, STR-compatible CD machine 30, and STR-compatible M
Together with the D machine 1, it is possible to operate so as to have a specific function specified by the manufacturer. Also, for example, for the STR 60,
If a manual operation is performed to select and receive and input data as an audio source transmitted from 00, it is possible to monitor this as audio. If a manual operation is performed in the STR-compatible MD machine 1 so that audio data transmitted from the same maker device 100 is selected as an input source, this is transmitted to the MD.
Can also be recorded. In this regard, the same applies to other manufacturers' devices 110 described below.

Other manufacturer's equipment 110 is also IEEE13
Although it is any digital AV device having a communication function compatible with the 94 interface, the manufacturer is different from the STR 60, the STR compatible CD machine 30, and the STR compatible MD machine 1. Here, the other manufacturer's equipment 110 may be a CD player, an MD recorder / player, a digital VTR, or the like. Further, in the case of the other manufacturer's equipment 110, in principle, the S
Vender Dependent Commnan specified by TR60 manufacturer
d is not supported.

Although not shown here, for example, each of the AV devices shown in FIG. 1 is provided with a power outlet for inputting power from a commercial AC power supply. Alternatively, if the battery can be driven, the battery can be stored. That is, each device can independently obtain power.

1-2. STR (Front Panel) Next, as an external configuration of the STR 60 and the STR-compatible CD machine 30 and the STR-compatible MD machine 1 which are main components of the system shown in FIG. The respective front panel parts will be described.

FIG. 2 shows the front panel of the STR 60 main body. A power key 120 is provided on the lower left side of the front panel. By operating the power key 120, the power supply of the STR 60 is switched on / off. Note that the power-off state here refers to a so-called standby state in which the standby power supply is operating, and is different from, for example, a state in which supply of commercial AC power (or battery) is cut off. In this regard, the STR-compatible CD machine 30 described below will be described.
And the STR-compatible MD machine 1. Also,
Although detailed description is omitted here, the STR 60 also has a sleep mode for setting a sleep state, so that power saving is considered.

A headphone jack 27j is provided on the left side of the power key 120.

A display section 75 is disposed substantially at the center of the front panel. The display unit 75 in this case is an FL tube display unit 75A for mainly displaying characters.
Is provided, and here, display for 14 characters per line is performed. A segment display section 75B is provided around the area, and predetermined contents (not shown) are displayed by the segments.

The display key 1 is located on the left side of the display section 75.
27, and a dimmer key 128 is on the left.
Is provided. The display key 127 is basically used to change the display content on the display unit 75. The dimmer key 128 is for adjusting the luminance of the decorative LED actually provided on the display unit 75 and the front panel.

A jog dial 125 is provided on the right side of the FL tube display section 75A, and a band key 121 is provided above the jog dial 125.
A tuner mode key 122, a jog selection key 123, and an enter key 124 are shown. The band key 121 and the tuner mode key 122 are keys related to the tuner function of the STR 60, and are used when switching between the reception band and the tuner mode, respectively. The jog selection key 123 is a key for selecting a menu, and the enter key 124 is used for performing a determination operation. The jog dial 125 is used together with the above keys under a predetermined operation procedure, so that the user can perform various actual operations.

As an example, each time the jog selection key 123 is pressed once, the display content of the FL tube display section 75A changes in a toggle manner in the order of FUNCTION → SOUND → SETUP. Then, for example, when the jog dial 125 is rotated in a state where FUNCTION is displayed on the FL tube display section 75A, the selection of the source that the STR 60 inputs and outputs as monitor sound can be changed. At this time, the name of the input source currently selected according to the rotation operation of the jog dial 125 is displayed on the FL tube display section 75A. Depending on this operation, for example, tuner audio, analog input, and IEEE
Sources (devices) input via the E1394 bus can be sequentially selected in a predetermined order. For example, a band key 121, a tuner mode key 122, a jog selection key 123, an enter key 124
Such a key is provided with an LED for decoration on the back side, and is lit or blinked according to an operation state or the like.

The volume jog 126 is provided as a dial key for adjusting the audio signal level output from the STR 60, that is, for example, the volume output from the speakers SP (L) (R).

1-3. CD Machine (Front Panel) FIG. 3 shows a front panel portion of the STR-compatible CD machine 30. First, a power key 150 for power on / off (standby) is also provided on the lower left side of the front panel of the STR-compatible CD machine 30.

A disc insertion / removal section 159 for inserting / ejecting a CD is provided at the upper center of the front panel of the STR-compatible CD machine 30. For example, in order to eject a CD stored and loaded in the disk insertion / removal section 159, the disk insertion / removal section 15
The user operates the eject key 151 arranged on the right side of 9.

An FL tube display section 47A capable of displaying, for example, 14 characters per line is provided below the disc insertion / removal section 159.
And a display section 47 including a segment display section 47B. In this case, for the FL tube display unit 47A, for example, information indicating the playback status such as the track number of the track to be played back on the currently loaded CD, the playback time, or the like, is inserted into the subcode of the CD. Is displayed as characters or the like. The segment display section 47B shows a reproduction mode and the like. FL
Switching of display contents on the tube display unit 47A can be performed by operating a display key 156 arranged on the left side of the display unit 47. Further, the dimmer key 157 is operated for adjusting the brightness.

On the right side of the front panel, there is a CD.
Play / pause key 15
2. Stop key 153, Cue / fast forward / rewind key 15
4,155 are provided.

1-4. MD Machine (Front Panel) FIG. 4 shows a front panel portion of the STR-compatible MD machine 1. Here, a power key 130 is provided on the lower left side of the front panel of the STR-compatible MD machine 1.

At the upper center of the front panel, M
A disk insertion / removal section 145 for inserting / ejecting D is provided, and in this case also, an eject key 131 for ejecting MD is arranged on the right side.

Also in this case, the disk insertion / removal section 145
On the lower side, a display unit 24 including an FL tube display unit 24A and a segment display unit 24B capable of displaying, for example, 14 characters per line is provided. In this case, the FL tube display unit 24A
For example, information indicating the recording / reproducing status such as the track number of the track to be recorded or reproduced on the currently loaded MD and the recording / reproducing time is displayed. Further, the disc title and track name of the MD are also displayed. Also in this case, the segment display unit 2
4B shows a reproduction mode and the like. Furthermore, this ST
The R-compatible MD machine 1 is also provided with a display key 156 for switching display contents and a dimmer key 157 for brightness adjustment.

In this case, as keys related to recording and reproduction arranged on the right side of the front panel, in this case, a reproduction / pause key 132, a stop key 133, a cueing / fast forward /
Fast return keys 134 and 135, a recording key 136, a high-speed dubbing key 137, and a synchro recording key 138 are provided. The input selection key 139 is provided for selecting an input as a recording source. In response to the operation of the input selection key 139, for example, the currently selected recording source name is displayed on the FL tube display section 24A.

Here, as can be seen from the state of the front panel shown in FIGS. 2 to 4, each of the STR 60, the STR compatible CD machine 30, and the STR compatible MD machine 1 has a display unit for itself. 75, 47, and 24. In other words, for example, when a system including the STR and the STR-compatible device is considered as one audio component system, there is no integrated display part as this component system. This corresponds to the fact that, for example, devices connected via IEEE 1394 are originally independent of each other.

1-5. STR (internal) Subsequently, STR60, STR-compatible CD machine 30, and ST
Each internal configuration of the R-compatible MD machine 1 will be described.

First, an example of the internal configuration of the STR 60 is shown in the block diagram of FIG. In the STR 60, three types of audio signals, an audio signal transmitted via the IEEE 1394 bus 116, an audio signal of a tuner provided in the STR 60, and an external analog audio signal input from the analog input terminal 78 can be input. It is said.

IEEE 1394 interface 61
Is provided for transmitting and receiving data to and from another external device via the IEEE 1394 bus 116. Thus, the STR 60 is configured to be able to transmit and receive AV data with the outside and transmit and receive various commands. In the IEEE1394 interface 61,
It demodulates a packet received via the IEEE 1394 bus 116 and extracts data included in the demodulated packet. The extracted data is converted into data in a format suitable for internal data communication and output. For example, assume that audio data is transmitted from another AV device via the IEEE 1394 bus 116. IEEE1
The 394 interface 61 receives the transmitted audio data and performs demodulation processing on the packet. In this case, the data is converted into a data format of a digital audio data interface called IEC958, for example, and the demodulation processing unit 63 Output.

The demodulation processing unit 63 performs a required demodulation process on the input audio data according to, for example, the IEC958 format, and outputs the data to the digital filter 64.

The digital filter 64 mainly has a function of removing jitter from, for example, input audio data. Further, the data output from the demodulation processing unit 63 has different sampling frequencies according to the difference of the transmission source device and the like. Is also converted to a sampling frequency of 44.1 KHz and output. Thus, 44.1
Audio data converted to a signal format with a sampling frequency of KHz is a DSP (Digital Signa
l Processor) 65. For example, when audio data in a signal format with a sampling frequency of 44.1 KHz is transmitted from the transmission source, the demodulation processing unit 63 and the digital filter 6
4, the audio data is transmitted directly from the IEEE 1394 interface 61 to the DSP 65.

The DSP 65 performs various necessary signal processing on the audio data. For example, an equalizing process according to the equalizer setting is also executed here. Then, the audio data subjected to the signal processing is converted to A /
Output to the digital filter 69 of the D / D / A section 66.

The A / D / D / A section 66 is a circuit portion for performing analog-to-digital conversion processing and digital-to-analog conversion processing for audio signals. The audio data input to the digital filter 69 of the A / D / D / A unit 66 is converted to a signal as a voltage pulse train by being input to the D / A converter 68.
Then, it is input to the I-DAC converter 81. The I-DAC converter 81 converts the input voltage pulse train into a current. Here, although not shown, a reference level is provided in another system, and it is possible to vary the output current by operating the reference level. It can also be used for volume adjustment in the following level ranges.

In the amplifier 82, the I-DAC converter 8
1 is amplified and output to the speaker output terminal 83. Then, if the speakers SP (L) (R) are connected to the speaker output terminal 83, output as stereo sound is performed.

The tuner 77 is provided in the STR 60, and selects and demodulates radio waves of a radio broadcast received by the antenna 76, and outputs the radio waves to the selector 79 as, for example, an analog audio signal. An analog audio signal input via the analog audio signal input terminal 78 is also input to the selector 79.

The selector 79 selects one of the tuner unit 77 and the analog audio signal input terminal 78 as an input source under the control of, for example, the system controller 70, and converts the selected analog audio signal into an A / D signal.
Supply to the A / D converter 67 of the D / A section 66. The A / D converter 67 converts the input analog audio signal into digital audio data.

Here, when the digital audio data obtained by the A / D converter 67 is output as monitor sound, the D / A converter 68 → I−
The signal is output to the speakers SP (L) and (R) through the processing of the DAC converter 81 → the amplifier. Further, for example, for recording, the digital audio data obtained by the A / D converter 67 is converted to IEEE 139.
When it is necessary to output the digital audio data to another AV device via the four bus 116, the digital audio data is output to the modulation processing unit 80. The modulation processing unit 80 performs a modulation process conforming to the format of a digital audio data interface such as IEC958, and outputs the result to the IEEE 1394 interface 61. The IEEE 1394 interface 61 performs necessary processing such as packetization using the RAM 62, for example, to convert the data into a format conforming to the IEEE 1394 format. And IEEE1
Transmission output is performed to a target device via the 394 bus 116.

The system controller 70 is, for example, a CP
U (Central Processing Unit), ROM 71, RAM 7
2 for controlling various operations of the STR 60.

Further, information from the receiving unit 73 and the operation unit 74 is input to the system controller 70. For example, the receiving unit 73 receives a wireless command signal transmitted from the remote controller RM, and outputs the received command signal to the system controller 70. The operation unit 74 includes, for example, various keys provided on a front panel, and operation information corresponding to an operation performed on the operation unit 74 is output to the system controller 70. The system controller 70 executes various control processes so as to obtain required operations in response to the command signals and operation information input as described above. In addition, the system controller 75 also performs display control on the display unit 75 so as to display, for example, the above-described command signal and operation information, and required contents according to the current operation status and the like. As described above, the display section 75 includes, for example, an FL tube display section and a segment display section.

1-6. CD Machine (Internal) Next, the internal configuration of the STR-compatible CD machine 30 will be described with reference to the block diagram of FIG. As is well known, the CD 91, which is a read-only disk medium, is inserted into the disk insertion / removal portion 159 of the front panel of the main body, and is loaded at a playable position. The CD 91 loaded in the reproducible position is rotated at a constant linear velocity (CLV) by the spindle motor 31 during a CD reproducing operation. Then, data recorded in a pit form on the CD 91 is read out by the optical head 32 and the RF amplifier 3
5 is supplied. The objective lens 3 in the optical head 32
2a is held by a two-axis mechanism 33, and is displaceable in the tracking and focus directions. The optical head 32 can be moved in the radial direction of the CD 91 by a thread mechanism 34.

In the RF amplifier 35, in addition to the reproduced RF signal,
A focus error signal and a tracking error signal are generated, and these error signals are supplied to the servo circuit 36. The servo circuit 36 generates various drive signals such as a focus drive signal, a tracking drive signal, and a thread drive signal from the focus error signal and the tracking error signal, and controls the operations of the two-axis mechanism 33 and the thread mechanism 34. That is, focus servo control and tracking servo control are executed. The reproduced RF signal binarized by the RF amplifier 35 is also output to the timing generator 42. The timing generator 42 generates a timing signal based on the waveform timing of the reproduced RF signal. And outputs it to the CLV processor 43. In the CLV processor 43,
Based on the input timing signal, a drive signal for controlling the rotation of the spindle motor 31 at a required CLV speed is generated and supplied to the spindle motor. Thus, the spindle servo control for rotating the CD 91 by the CLV is executed.

The reproduced RF signal is supplied to the decoder 37. The decoder 37 first binarizes the input reproduced RF signal to obtain an EFM signal. And this E
The FM signal is subjected to EFM demodulation, CIRC decoding, and the like, and the information read from the CD 91 is decoded into 16-bit quantized, 44.1 kHz sampling format audio data.

The decoder 37 employs a configuration capable of extracting control data such as subcodes. The data portion as the subcode is supplied to the subcode processor 44, where the data portion is arranged into appropriate data as the subcode. In particular, TO TO recorded as sub-Q data of a subcode recorded in the lead-in area of a CD
C (Table Of Contents) information is also extracted. These subcode data and TOC are supplied to the system controller 50, and are used for various controls, for example. The system controller 50 executes various control processes so that various operations required as the CD machine are executed.

The reproduced RF signal binarized by the RF amplifier 35 is also supplied to a PLL circuit 39.
The PLL circuit 39 outputs a clock synchronized with the channel bit of the input EFM signal. The frequency of this clock is 4.3218 MHz at a normal 1 × speed.
It is said. The clock is supplied to, for example, the decoder 3
It is used as a clock for the signal processing circuit system 7 and thereafter.

In this case, the audio data output from the decoder 37 is supplied to the D / A converter 38 and the IEEE
The signal is branched and output to the 1394 interface 49. The audio data input to the D / A converter 38 is converted into an analog audio signal,
Via an external analog audio output terminal 41. The audio data input from the decoder 37 to the IEEE 1394 interface 49 is converted into data conforming to the IEEE 1394 format, and is converted to data conforming to the IEEE 1394 bus 11.
6 and transmitted to an external device. Also, I
The EEE1394 interface 49 also receives data such as commands transmitted from outside. Then, for example, the system controller 50 appropriately executes necessary processing according to the content of the received command.

When reproducing the CD 91, it is necessary to read the management information recorded on the CD 91, that is, the TOC.
The system controller 50 controls the CD according to the management information.
The number of tracks recorded in 91, the address of each track, and the like are determined, and playback operation control is performed. For this reason, when the CD 91 is loaded, the system controller 50 executes the reproducing operation on the innermost peripheral side (lead-in area) of the disc on which the TOC is recorded, thereby reading out the data.
The TOC information is extracted as described above. The TOC is stored in, for example, the work RAM 52 so that the TOC can be referred to when the CD 91 is reproduced.

The system controller 50 is a microcomputer having a CPU, an internal interface, and the like, and controls the various operations described above. The program ROM 28 stores programs and the like for implementing various operations in the STR-compatible CD machine 30, and the work RAM 29 stores the system controller 11
The data, programs, and the like necessary for executing various processes are appropriately stored.

As is well known, text data can be inserted into a subcode as a CD standard, and can be used for, for example, a disc title or track name. And
The STR-compatible CD machine 30 of the present embodiment corresponds to the text data of this CD. That is, the character display based on the text data in the subcode of the CD is displayed on the display unit 4.
7 can be performed. For this reason, the STR-compatible CD machine 30 of the present embodiment has a CD text decoder 4
5 and a CD text memory 46 are provided. For example, the subcode data obtained by the subcode processor 44 is input to the CD text decoder 45. Then, in the CD text decoder 45, if CD text data is inserted in the input subcode data, a decoding process is performed to obtain text data. The text data thus obtained is stored in the system controller 50.
Is stored in the CD text memory 46 under the control of. Thereafter, the system controller 50 reads text data from the CD text memory 46 as necessary, and executes control processing so that the text data is displayed as characters on the FL tube display unit of the display unit 47. .

The operation section 48 comprises various keys provided on the front panel of the main body. Although not shown here, a remote control function using, for example, an infrared remote commander may be added as the operation unit 48.

The display section 47 performs a required display operation when the CD 91 is reproduced. For example, time information such as total playing time, progress time during reproduction and recording, track number, name information such as CD disk name and track name, and various displays such as operation state and operation mode are controlled by the system controller 50. It is performed based on. The display unit 47 also includes the FL tube display unit and the segment display unit, as described above.

1-7. MD machine (internal) The block diagram of FIG. 7 shows an MD recorder / player S
1 shows an internal configuration of a TR-compatible MD machine 1. A magneto-optical disk (mini disk) 90 on which audio data is recorded / reproduced is driven to rotate by the spindle motor 2. Then, a laser beam is irradiated on the magneto-optical disk 90 by the optical head 3 during recording / reproduction.

The optical head 3 performs a high-level laser output for heating the recording track to the Curie temperature during recording, and a relatively low-level laser for detecting data from reflected light by the magnetic Kerr effect during reproduction. Output. For this reason, the optical head 3 is equipped with a laser diode as a laser output unit, an optical system including a polarization beam splitter and an objective lens, and a detector for detecting reflected light. The objective lens 3a is held by a biaxial mechanism 4 so as to be displaceable in a radial direction of the disk and in a direction of coming into contact with and separating from the disk.

The optical head 3 with the disk 90 interposed
The magnetic head 6a is disposed at a position facing the head. The magnetic head 6a performs an operation of applying a magnetic field modulated by the supplied data to the magneto-optical disk 90. The entire optical head 3 and the magnetic head 6a can be moved in the disk radial direction by the thread mechanism 5.

The information detected from the disk 90 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 calculates the reproduction RF signal, the tracking error signal TE, the focus error signal FE, and the groove information (absolute position information recorded as a pre-groove (wobbling groove) on the magneto-optical disk 90) by arithmetic processing of the supplied information. GFM and the like are extracted. The extracted reproduced RF signal is supplied to the encoder / decoder section 8. Further, the tracking error signal TE and the focus error signal FE are supplied to the servo circuit 9, and the groove information GFM is supplied to the address decoder 10.

The servo circuit 9 is provided with the supplied tracking error signal TE, focus error signal FE, and the system controller 1 constituted by a microcomputer.
1 to generate various servo drive signals based on a track jump command, an access command, rotation speed detection information of the spindle motor 2 and the like, and control the two-axis mechanism 4 and the thread mechanism 5 to perform focus and tracking control. 2 is controlled to a constant linear velocity (CLV).

The address decoder 10 decodes the supplied groove information GFM to extract address information.
This address information is supplied to the system controller 11 and used for various control operations. The reproduced RF signal is subjected to decoding processing such as EFM demodulation and CIRC in the encoder / decoder section 8. At this time, addresses, subcode data, etc. are also extracted and supplied to the system controller 11.

EFM demodulation in encoder / decoder section 8
Audio data (sector data) decoded by CIRC or the like is temporarily written to the buffer memory 13 by the memory controller 12. The reading of data from the disk 90 by the optical head 3 and the transfer of reproduced data in the system from the optical head 3 to the buffer memory 13 are at 1.41 Mbit / sec, and are usually performed intermittently.

The data written in the buffer memory 13 is read out at the timing when the transfer of the reproduction data becomes 0.3 Mbit / sec, and is supplied to the encoder / decoder section 14. Then, a reproduction signal processing such as a decoding processing for the audio compression processing is performed, and 44.1 KHz sampling, 14.1 KHz sampling,
It is a 6-bit quantized digital audio signal. This digital audio signal is converted into an analog signal by the D / A converter 15, the output processing section 16 performs level adjustment, impedance adjustment, and the like, and outputs the analog audio signal Aout from the line output terminal 17 to an external device. . In addition, it is supplied to the headphone output terminal 27 as the headphone output HPout, and is output to the connected headphones.

The digital audio signal decoded by the encoder / decoder section 14 is supplied to the digital interface section 22 so that it can be output from the digital output terminal 21 as digital audio data Dout to an external device. . For example, the data is output to an external device in a transmission form using an optical cable.

When a recording operation is performed on the magneto-optical disk 90, the analog audio signal Ain supplied to the line input terminal 18 is converted into digital audio data by the A / D converter 19, The data is supplied to the encoder / decoder 14 and subjected to audio compression encoding. Or digital input terminal 2 from an external device
When the digital audio data Din is supplied to 0, control codes and the like are extracted by the digital interface unit 22, and the digital audio data is supplied to the encoder / decoder unit 14 and subjected to audio compression encoding processing. . Although not shown, it is naturally possible to provide a microphone input terminal and use the microphone input as a recording signal.

The recording data compressed by the encoder / decoder section 14 is once written and accumulated in the buffer memory 13 by the memory controller 12 and then read out in units of a predetermined amount of data to be encoded / encoded.
It is sent to the decoder section 8. After being subjected to encoding processing such as CIRC encoding and EFM modulation by the encoder / decoder section 8, the encoded data is supplied to the magnetic head drive circuit 6.

The magnetic head drive circuit 6 supplies a magnetic head drive signal to the magnetic head 6a in accordance with the encoded recording data. That is, the magnetic head 6a applies the N or S magnetic field to the magneto-optical disk 90. At this time, the system controller 11 supplies a control signal to the optical head so as to output a laser beam at a recording level.

The operation unit 23 also includes, for example, various keys provided on a front panel of the main body.
Operation information output by an operation performed on the operation unit 23 is input to the system controller 11, and the system controller 11 executes operation control according to the operation information.

As is well known, in a recording / reproducing apparatus compatible with MD, program editing such as track (program) division, track concatenation, track erasure, track name input, and disc name input can be performed. However, since these operations are relatively complicated, it is actually preferable to provide a configuration capable of receiving an operation command signal transmitted from a remote controller (not shown).
It becomes possible to perform the above-mentioned operations related to editing various programs by operating keys provided on the remote controller.

The display operation of the display section 24 is controlled by the system controller 11. That is, the system controller 11 transmits data to be displayed when the display operation is performed to the display driver in the display unit 24. The display driver drives a display operation of a display by a liquid crystal panel or the like based on the supplied data, and executes display of required numbers, characters, symbols, and the like. The display unit 24 shows the operation mode state, the track number, the recording time / reproduction time, the editing operation state, etc. of the recording / reproducing disc. The disk 90 can record character information (track name, etc.) managed in association with a program serving as main data. And so on. Further, in the case of the present embodiment, it is also possible to record sub-data (AUX data) as a data file independent of data such as music as a program on the disc 90. The data file as AUX data is information such as characters and still images, and these characters and still images can be displayed and output by the display unit 24.

In the present embodiment, a JPEG decoder 26 is provided as a configuration for displaying a still image and characters as AUX data on the display unit 24. That is, in the present embodiment, still image data, which is a data file as AUX data, is a JPEG (Joint Photographi
c Coding Experts Group) recording. In the JPEG decoder 26, a file of still image data reproduced on the disk 90 and stored in, for example, the buffer memory 13 is input via the memory controller 12, decompressed according to the JPEG method, and output to the display unit 24. I do. Thus, the still image data, which is the AUX data, is displayed on the display unit 24. As described above, the display section 24 in this case also includes the FL tube display section and the segment display section.

The system controller 11 is a microcomputer having a CPU, an internal interface and the like, and controls the various operations described above. The program ROM 28 stores programs for realizing various operations in the recording / reproducing apparatus, and the work RAM 29 appropriately stores data, programs, and the like necessary for the system controller 11 to execute various processes. Is done.

By the way, when performing the recording / reproducing operation on the disk 90, the management information recorded on the disk 90, that is, P-TOC (pre-mastered TOC),
-It is necessary to read out TOC (user TOC). The system controller 11 determines the address of the area to be recorded on the disc 90 and the address of the area to be reproduced on the disk 90 according to the management information. This management information is held in the buffer memory 13. Then, when the disk 90 is loaded, the system controller 11 reads the management information by executing a reproduction operation on the innermost peripheral side of the disk on which the management information is recorded, and stores the information in the buffer memory 13. Thereafter, it can be referred to when recording / reproducing / editing the program on the disc 90.

The U-TOC is rewritten in accordance with the recording of program data and various editing processes. The rewriting operation is performed on the U-TOC information, and the U-TOC area of the disc 90 is rewritten at a predetermined timing in accordance with the rewriting operation.

An AUX data file is recorded on the disk 90 separately from the program, but an AUX-file is recorded on the disk 90 for managing the AUX data file.
A TOC is formed. The system controller 11 is U-
At the time of reading the TOC, the AUX-TOC is also read and stored in the buffer memory 13 so that the management state of the AUX data can be referred to when necessary. The system controller 11 reads the AUX data file at a predetermined timing as needed (or at the same time as reading the AUX-TOC), and stores it in the buffer memory 13. The display unit 24 and the IEEE 1394 interface 25 according to the output timing managed by the AUX-TOC.
To output characters and images in the external device via the PC.

Depending on the IEEE 1394 interface 25, transmission and reception of audio data is enabled. That is, in the MD recorder / player of the present embodiment, audio data transmitted via the IEEE 1394 bus 116 is received by the IEEE 1394 interface 25, and the received audio data is recorded on the disk 90. Can be done. Here, if the transmitted audio data has a format of, for example, a sampling frequency of 44.1 KHz and a quantization bit of 16 bits, the data is transferred to the encoder / decoder unit 14 via the system controller 11 and compressed. Processing is performed. On the other hand, if the transmitted audio data is compressed audio data that has been compressed by a method suitable for the MD recorder / player, it is transferred to the memory controller 12 via the system controller 11. To be done. In addition,
As a matter of course, transmission and reception of commands can be performed by the IEEE 1394 interface 25. For example, the system controller 11 executes a required process according to the content of the received command.

2. Data Communication According to IEEE 1394 According to Embodiment 2-1. Outline Hereinafter, data communication according to the IEEE 1394 standard as the present embodiment will be described.

IEEE 1394 is one of the standards for serial data communication. As a data transmission method based on the IEEE 1394, an isochronous communication method is used.
There are a asynchronous communication method and an asynchronous communication method for performing asynchronous communication regardless of the cycle. Generally, the Isochronous communication method is used for transmitting and receiving data, and the Asynchronous communication method is used for transmitting and receiving various control commands. And
Using one cable, transmission and reception can be performed by these two types of communication systems. Therefore, hereinafter, the present embodiment will be described based on the transmission form of the present embodiment based on the IEEE 1394 standard described above.

2-2. Stack Model FIG. 8 shows an IEEE 1394 stack model to which the present embodiment corresponds. In the IEEE 1394 format, the Asynchronous system (40
0) and the Isochronous system (500). Here, Asynchronous system (400)
And Physical Layer (301) at the bottom as a layer common to and Isochronous system (500).
(Physical layer) is provided, and a link layer is provided above the physical layer.
r (302) (link layer) is provided. Physic
al Layer (301) is a layer for controlling signal transmission in hardware, and is a Link Layer.
(302) is a layer having a function of converting an IEEE 1394 bus into, for example, an internal bus specified for each device.

The Physical Layer (30
1), Link Layer (302), and Transaction Layer (401) described next.
Is Event / Control / Configura
Serial Bus Ma by Tion's line
Linked to the management 303. Also, AV
Cable / Connector 304 indicates physical connectors and cables for AV data transmission.

[0092] A Transaction Layer (401) is provided above the Link Layer (302) in the Asynchronous system (400). Transaction Layer (4
01) is a layer that defines a data transmission protocol as IEEE1394, and is a basic Asynchron.
As ous Transaction, WriteTransaction, Rea is described later.
d Transaction, Lock Transa
ction is defined.

[0093] Then, the Transaction Layer
er (401) for FCP (Function Control
l Protocol) (402). FCP (40
2) AV / C Command (AV / C Digital Inte
By using a control command specified as (rface Command Set) (403), command control for various AV devices can be executed.

[0094] Also, Transaction Layer
For the upper layer of r (401), Connection
Management Procedures (50
5) by using Plug (IEEE1394) described later.
Pl for setting the logical device connection relationship in
ug Control Registers (40
4) is defined.

In the Isochronous system (500), above the Link Layer (302), CI
P Header Format (501) is defined, and this CIP Header Format (50) is defined.
SD-DVCR Realt in the form managed in 1)
im Transmission (502), HD-
DVCR Realtime Transmission
n (503), SDL-DVCR Realtime
Transmission (504), MPEG2-T
S Realtime Transmission (5
05), Audio and Music Realti
A transmission protocol such as me Transmission (506) is defined.

[0096] SD-DVCR Realtime Tr
answer (502), HD-DVCR R
ealtime Transmission (50
3), SDL-DVCR Realtime Tran
The transmission (504) is a digital V
This is a data transmission protocol corresponding to TR (Video Tape Recorder). SD-DVCR Realtime T
The data handled by the transmission (502) is S
D-DVCR recording format (5
08) according to the data sequence (SD
-DVCR data sequence (507))
It is said. HD-DVCR Realtime
Data handled by Transmission (503) is
HD-DVCR recording format
The data sequence (SD-DVCR datasequence (50) obtained according to the rule of (510)
9)). SDL-DVCR Realtime
The data handled by Transmission (504) is the SDL-DVCR recording form.
at (512) (SD-DVCR data sequence (5
11)).

MPEG2-TS Realtime T
transmission (505) is a transmission protocol corresponding to, for example, a tuner corresponding to digital satellite broadcasting, and data handled by this is DVB recordin.
g format (514) or ATV recorder
data sequence (MPEG2-TS data) obtained in accordance with the definition of ding format (515).
sequence (513)).

[0098] Also, Audio and Music
Realtime Transmission (50
6) is a transmission protocol corresponding to, for example, all digital audio devices including the MD system according to the present embodiment. Data handled by this is Audio and Mus.
A data sequence (Audio) obtained according to the rules of the ic recording format (517).
and Music data sequence).

2-3. FIG. 9 shows a structural example of a cable actually used as an IEEE 1394 bus. In this figure, connectors 600A and 600B are connected via a cable 601, and here, connectors 600A and 600B are connected.
The case where six pins of pin numbers 1 to 6 are used as the pin terminals of 00B is shown. Connectors 600A, 600
Regarding each pin terminal provided in B, pin number 1 is power supply (VP), pin number 2 is ground (VG), pin number 3 is TPB1, pin number 4 is TPB2, and pin number 5 is T
PA1 and pin number 5 are TPA2. And
The connection form of each pin between the connectors 600A and 600B is as follows: pin number 1 (VP) -pin number 1 (VP) pin number 2 (VG) -pin number 2 (VG) pin number 3 (TPB1) -pin number 5 ( TPA1) Pin number 4 (TPB2) -Pin number 6 (TPA2) Pin number 5 (TPA1) -Pin number 3 (TPB1) Pin number 6 (TPA2) -Pin number 3 (TPB2). Then, of the above-mentioned pin connection set, two pairs of twisted wires of pin number 3 (TPB1) -pin number 5 (TPA1) pin number 4 (TPB2) -pin number 6 (TPA2) signal differentially. A signal line 601A for mutually transmitting the signals is formed, and two pairs of twisted wires of pin number 5 (TPA1) -pin number 3 (TPB1) pin number 6 (TPA2) -pin number 3 (TPB2) A signal line 601B for mutually transmitting signals is formed.

The two sets of signal lines 601A and signal lines 60
1B are a data signal (Data) shown in FIG. 10A and a strobe signal (Strobe) shown in FIG. 10B. The data signal shown in FIG. 10A is output from TPB1 and TPB2 using one of the signal lines 601A and 601B, and is input to TPA1 and TPA2. The strobe signal shown in FIG. 10B is a signal obtained by performing a predetermined logical operation on a data signal and a transmission clock synchronized with the data signal, and has a frequency lower than the actual transmission clock. Have. The strobe signal is output from the TPAs 1 and 2 using the other signal line of the signal line 601A or 601B that is not used for data signal transmission, and is input to the TPBs 1 and 2.

For example, the data signal and the strobe signal shown in FIGS.
Assuming that the data is input to a 94-compatible device, the device performs a predetermined logical operation on the input data signal and strobe signal to generate a transmission clock (Clock) as shown in FIG. Generate and use for required input data signal processing. In the IEEE 1394 format, by adopting such a hardware data transmission form, it is not necessary to transmit a high-speed cycle transmission clock between devices via a cable, and the reliability of signal transmission is improved. In the above description, the specification of 6 pins has been described. However, in the IEEE1394 format, the power supply (VP) and the ground (VG) are omitted,
A signal line 601A and a signal line 60, which are two sets of twist lines
There is also a 4-pin specification consisting of only 1B. For example, in the MD recorder / player 1 of the present embodiment, consideration is given to providing a simpler system for the user by using the 4-pin cable.

2-4. Bus Connection Between Devices FIG. 11 schematically shows an example of a form of connection between devices using an IEEE 1394 bus. In this figure, devices A, B,
Five devices (Node) of C, D, and E are IEEE139
The case where they are communicably connected by four buses (that is, cables) is shown. IEEE 1394
In the interface, I, like devices A, B, C
The so-called "digi-chain connection" in which connections are made in series by the EEE1394 bus is made possible. FIG.
In the case of 1, a so-called "branch connection" in which a certain device and a plurality of devices are connected in parallel as shown in the connection form between the device A and the devices B, D, and E is also possible. . As a whole system, a maximum of 63 devices (Nod
e) can be connected. However, depending on the daisy chain connection, connection of up to 16 units (16 pops) is possible. The terminator required for SCSI is not required for the IEEE 1394 interface. In the IEEE 1394 interface, it is possible to perform mutual communication between devices connected by the daisy chain connection or the branch connection as described above. That is, in the case of FIG. 11, mutual communication between arbitrary devices among devices A, B, C, D, and E is enabled.

In a system in which a plurality of devices are connected by an IEEE 1394 bus (hereinafter, also referred to as an IEEE 1394 system), No. assigned to each device is assigned.
The process of setting the deID is actually performed. This process is schematically shown in FIG. Here, FIG.
In the IEEE 1394 system according to the connection form shown in FIG. 1, disconnection and insertion of cables, power on / off of certain devices in the system, PHY (Physical Layer Protocol)
If there is a spontaneous generation process, etc. in IEEE 139
In four systems, a bus reset occurs. Thereby, IEEE standards are established between the devices A, B, C, D, and E.
A process of performing a bus reset notification to all devices via the 1394 bus is executed.

As a result of this bus reset notification, FIG.
As shown in (b), by performing communication (Child-Notify), a parent-child relationship is defined between adjacent device terminals.
That is, a tree structure between devices in the IEEE 1394 system is constructed. Then, a device as a root is defined according to the construction result of the tree structure.
The root is a device in which all terminals are defined as children (Ch; Child). In the case of FIG. 12B, the device B is defined as a root. Conversely, for example, the terminal of the device A connected to the device B as this route is defined as a parent (P; Parent).

When the tree structure and the route in the IEEE 1394 system are defined as described above, subsequently, as shown in FIG. 12C, each device sends a self-declaration of its own Node-ID as Self. -An ID packet is output. Then, the route sequentially grants (grants) to the Node-ID, whereby the IE is obtained.
The address of each device in the EE1394 system, that is, the Node-ID is determined.

2-5. Packet In the IEEE 1394 format, as shown in FIG. 13, an isochronous cycle (nomi
The transmission is performed by repeating a nal cycle) cycle. In this case, 1 Isochronous cy
cle is 125 μsec, and the band is 100
MHz. In addition, Isochronous c
It is stipulated that the cycle of the cycle may be other than 125 μsec. And this Isochr
The data is packetized and transmitted for each on cycle.

As shown in this figure, Isochrono
At the top of the us cycle, 1 Isochronou
Cycle Start indicating the start of s cycle
Packet is arranged. This Cycle Star
Although the detailed description of tPacket is omitted here, IEEE defined as Cycle Master is used.
The generation timing is indicated by one specific device in the E1394 system. Cycle Start P
Following the acket, IsochronousPac
ket is preferentially arranged. Isochronous
As shown in the figure, Packets are packetized for each channel, are arranged in a time division manner, and are transferred (Isochronous substitutions).
Also, Isochronous subactions
In Iso, the delimiter for each packet is Isochron.
pause section called ous gap (for example, 0.05 μ
sec) is provided. Thus, IEEE 1394
In the system, one transmission line uses Isochron.
It is possible to transmit and receive nous data in multiple channels.

Here, for example, the compressed audio data (hereinafter, also referred to as ATRAC (registered trademark) data) supported by the MD recorder / player of the present embodiment is transmitted to Isoch.
Considering that the transmission is performed by the robust method, A
Assuming that the transfer rate of TRAC data is 1.4 Mbps at 1 × speed, 1 Isochromo which is 125 μsec.
At least about 20 bytes of ATRAC data is transferred to Isochronous every nouscycle cycle
When transmitted as a packet, time-series continuity (real-time property) is ensured. For example, when a certain device transmits ATRAC data, although detailed description is omitted here, an ATRM (Isochronous Resource Manager) in the IEEE 1394 system has an AT
Only real-time transmission of RAC data can be secured,
Requests the size of the Isochronous packet. The IRM monitors the current data transmission status and gives permission / non-permission. If the permission is given, the ATRAC data is transmitted to the Isochron by the designated channel.
The packet can be transmitted to an ouS packet. This is called bandwidth reservation in the IEEE 1394 interface.

Within the band of the Isochronous cycle, Isochronous subacti
ons using the remaining band that is not used by Async
Hourous subactions, ie Asyn
A chronous packet transmission is performed. In FIG. 13, two As of Packet A and Packet B are shown.
An example in which an asynchronous packet is transmitted is shown. Asynchronous Pac
After the ket, ack gap (0.05 μsec)
A signal called ACK (Acknowledge) accompanies the idle period. ACK is transmitted as As
In the process of “ynchronous Transaction”, in order to notify the transmitting side (Controller) that some asynchronous data has been received, the receiving side (Target) is implemented in hardware.
This is the signal output from t). Also, Asynchr
Before and after a data transmission unit consisting of an onous packet and an ACK following the same packet, a su of about 10 μsec is set.
A pause period called a "action gap" is provided. At this time, the ATRAC data is transmitted by the Isochronous Packet, and the AUX data file assumed to be attached to the ATRAC data is transmitted to the Async.
If the transmission is carried out by using a long packet, the ATRAC data and the AUX data file can be apparently transmitted at the same time.

2-6. Transaction rules In the process transition diagram of FIG. 14 (a), Asynchrono
A basic communication rule (transaction rule) in the us communication is shown. This transaction rule is defined by the FCP. As shown in FIG. 14A, first, in step S11, Requester
The (transmission side) transmits a Request to the responder (reception side). In Responder,
When this Request is received (step S12),
First, the acknowledgment is returned to the Requester (step S13). On the transmitting side, Acknow
By receiving “edge”, it is recognized that the Request has been received on the receiving side (step S14). Thereafter, the responder responds to the request received in step S12,
nse to the Requester (step S1
5). The Requester receives the Response (Step S16), and responds to the Response.
Acknowledgment is transmitted to der (step S17). Acknow on Responder
Receiving “edge” recognizes that the response has been received by the transmission side.

Req transmitted according to FIG.
FIG. 14 shows the west Transaction.
As shown on the left side of (b), Write Requests
t, Read Request, Lock Request
It is roughly defined into three types, st. Write
Request is a command for requesting data writing, and Read Request is a command for requesting data reading. Lock Request
Will not be described in detail here, but swap com
This is a command for a pair, a mask, and the like.

The Write Request is an Asynchronous Pac to be described later.
Three more types are defined according to the data size of the command (operand) stored in the GET (AV / C Command Packet). Write Req
west (data quadlet) is Async
The command is transmitted using only the header size of the strong packet. Write Request
(Data block: data length = 4
byte), Write Request (data
block: data length @ 4 bytes)
Is to transmit a command by adding a data block to a header as an Asynchronous Packet. The two differ in whether the data size of the operand stored in the data block is 4 bytes or more.

Similarly, the Read Request is
O to store in Asynchronous Packet
Depending on the data size of perand, Read Re
quest (data quadlet), Read
Request (datablock: data le
ngth = 4 bytes), Read Request
(Data block: data length $ 4
byte) are defined.

Further, Response Transac
The “tion” is shown on the right side of FIG. For the three types of Write Request described above, Write Response or No Re
spose is defined. In addition, Read Requ
east (data quadlet)
d Response (data quadlet) is defined, and ReadRequest (data blo
ck: data length = 4 bytes) or R
ead Request (data block: da
ta length @ 4 bytes)
d Response (datablock) is defined.

For the Lock Request, L
ok Response is defined.

2-7. Addressing FIG. 15 shows the addressing structure of the IEEE 1394 bus. As shown in FIG.
In the 1394 format, 64 bits are prepared as a bus address register (address space). The upper 10-bit area of this register is the IEEE1394
A bus ID for identifying the bus is shown, and as shown in FIG.
Bus IDs can be set. bus
# 1023 is defined as a local bus.

In FIG. 15A, the 6-bit area following the bus address is the IEEE indicated by the bus ID.
Node of device connected to each E1394 bus
Indicates the ID. As shown in FIG. 15C, the Node IDs are 63 Nodes # 0 to # 62.
e ID can be identified. Bus ID and No.
The area of a total of 16 bits indicating the de ID is an AV
A device connected to a certain bus is specified on the IEEE 1394 system by the bus ID and the Node ID, which corresponds to the destination ID in the header of the / C Command Packet.

In FIG. 15A, a 20-bit area following the Node ID is a register space.
And 28 following this register space
The bit area is register address. The value of register space is [F
FF FFh] and reg shown in FIG.
The content of the register is defined as shown in FIG. register
er address designates the address of the register shown in FIG.

In brief, in the register shown in FIG. 15E, for example, an address 512 [00 00 02
00h] Serial Bus-depen
By referencing dent Registers, Is
ochronous cycle cycle time,
Information on available channels can be obtained. Address 10
Confi starting from 24 [00 00 04 00h]
node Uniqu
Necessary information relating to the Node such as e ID and subunit ID is stored. These Node Uni
The "que ID" and "subunit ID" are necessary when the device is actually connected to the IEEE 1394 bus and the connection relationship is established.

The Node Unique ID is device information that is unique for each device and is expressed by 8 bytes.
It is assumed that there is no other device having the mode Unique ID.

The subunit ID is a Vend indicating the name of the manufacturer of the device as the node.
er Name (module_vender_ID) or Model Name (model_vender_id) indicating the model name of the device as a Node.
ID).

The Node Unique ID is device identification information that is unique to each device and is expressed by 8 bytes. Is done. The Vendor Name is information indicating the name of the manufacturer of the Node.
lName is information indicating the model of the Node. Therefore, these Vendor Name and Mod
There will be devices that have the same el Name in common. Therefore, by referring to the contents of the Configuration ROM, the Node attached to the model is referred to.
Unique ID can be identified, and s
From the contents of the unit ID, it is possible to identify the manufacturer and model of the Node. Note that, while the Node Unique ID is indispensable, the Vendor Name and Model Name
Is an option and does not necessarily need to be set in the device.

2-8. CIP FIG. 16 shows a structure of a CIP (Common Isochronos Packet). That is, the Isochron shown in FIG.
3 is a data structure of an ous Packet. As described above, ATRAC data (audio data), which is one of the recording / playback data supported by the MD recorder / player of the present embodiment, is transmitted and received by Isochronous communication in IEEE 1394 communication. . That is, the amount of data enough to maintain the real-time property is determined by the Isochronous Pack
, and store it in 1isochronous cycle
The data is sequentially transmitted for each e.

The first 32 bits (1 quadle) of the CIP
t) is a 1394 packet header. 139
In the 4-packet header, the 16-bit area is data_Length, the 2-bit area is tag, the 6-bit area is channel, and the 4
The bit is tcode, and the following four bits are sy. Then, 1 quad following the 1394 packet header
In the let area, header_CRC is stored.

2 quadl following header_CRC
The area of “et” becomes the CIP header. The upper two bits of the upper quadlet of the CIP header are respectively "0".
'0' is stored, and the subsequent 6-bit area indicates an SID (transmission node number). The 8-bit area following the SID is D
BS (data block size), which indicates the size of a data block (unit data amount of packetization). Subsequently, areas of FN (2 bits) and QPC (3 bits) are set, the number of divisions at the time of packetization is indicated in the FN, and the qu added for division is indicated in the QPC.
The number of adlets is shown. SPH (1 bit) indicates the flag of the header of the source packet, and DBC stores the value of a counter for detecting packet loss.

'0' and '0' are stored in the upper two bits of the lower quadlet of the CIP header. Subsequently, areas of FMT (6 bits) and FDF (24 bits) are provided. The signal format (transmission format) is shown in the FMT, and the value shown here makes it possible to identify the data type (data format) stored in the CIP. Specifically, MPEG
Stream data, Audio stream data, digital video camera (DV) stream data, and the like can be identified. The data format indicated by the FMT is, for example, the CIP Header shown in FIG.
SD-DVCR managed by Format (401)
Realtime Transmission (50
2), HD-DVCR Realtime Trans
mission (503), SDL-DVCR Rea
ltime Transmission (504), M
PEG2-TS Realtime Transmit
session (505), Audio and Music
Realtime Transmission (50
6). The FDF is a format-dependent field, and is an area indicating a further subdivided classification of the data format classified by the FMT. If the data is audio-related data, for example, whether the data is linear audio data or MID
It is possible to identify whether the data is I data. For example, in the case of ATRAC data of the present embodiment, first, FMT
Indicates that the data is in the category of the audio stream data, and the FDF stores a specific value in accordance with the regulations, thereby indicating that the audio stream data is ATRAC data.

Here, for example, when the FMT indicates that it is MPEG, the FDF stores synchronization control information called TSF (time shift flag).
DVCR (digital video camera) by FMT
, The FDF is defined as shown below in FIG. Here, 5
0/60 (1 bit) defines the number of fields per second, and STYPE (5 bits) indicates whether the video format is SD or HD.
T indicates a time stamp for frame synchronization.

Following the CIP header, FMT, F
Data indicated by the DF is stored by a sequence of n data blocks. When the FMT and FDF indicate that the data is ATRAC data, ATRAC data is stored in this data block area. After the data block, data_CRC is finally placed.

2-9. Connection management In IEEE1394 format, "plug"
According to the logical connection concept called IEEE 1394,
A connection relationship between devices connected by the bus is defined. FIG. 17 shows an example of a connection relationship defined by a plug. In this case, VTR1, VTR2, and set-top box (ST) are connected via an IEEE1394 bus.
B; digital satellite broadcast tuner), monitor device (Mon
itor) and digital still camera (Camer)
The system configuration to which a) is connected is shown.

[0130] Here, the connection form by the IEEE1394 plug is point to point-c.
connection and broadcast conn
There are two forms, the “action”. point
The to point-connection is a connection mode in which the relationship between the transmitting device and the receiving device is specified, and data transmission is performed between the transmitting device and the receiving device using a specific channel. On the other hand, broadc
The “ast connection” is for transmitting data without specifying a receiving device and a channel to be used in a transmitting device. The receiver performs reception without particularly identifying the transmission device, and if necessary, performs necessary processing according to the content of the transmitted data. In the case of FIG. 17, point to point-connect
In the state, the STB is set to be transmitted, the VTR1 is set to be received, and data is transmitted using the channel # 1, and the digital still camera is set to transmit, the VTR2 is set to receive, and the channel # 2 is set. Is set to be set so that data transmission is performed by using the. Also, from a digital still camera, b
A state in which data transmission is set also by the broadcast connection is shown. In this example, the broadcast connection is used.
A case is shown in which the monitor device receives the data transmitted by the “tion” and performs a required response process.

The connection form (plug) as described above is based on the PCR (Plug Control) provided in the address space of each device.
orol Register). FIG. 18 (a)
oPCR [n] (output plug control register)
18B shows the structure of iPCR [n] (input plug control register).
The size of each of these oPCR [n] and iPCR [n] is 32 bits. In the oPCR shown in FIG. 18A, for example, when “1” is stored in the on-line of the upper 1 bit, the plug is connected to the Isochr.
It is indicated that online transmission of onous data is possible, and the following broadcast connection is performed.
When '1' is stored in the on counter (1 bit), it indicates that the transmission is performed by the broadcast connection. The following point to
point connection counter
(6 bits) contains p assigned to the plug.
The number of point to point connections is indicated. Then, transmission is indicated by a channel indicated by channel number in a 6-bit area from the 11th upper bit. FIG.
In the iPCR of (b), for example,
If “1” is stored in the n-line, it indicates that the plug is online capable of receiving Isochronous data, and the following broadcas
tconnection counter (1 bit)
If '1' is stored in the broadcastcast co
This indicates that the transmission is performed by nection. The following point to point connection
The n counter (6 bits) has a point to point co
The number of “connection” is indicated, and transmission is performed by a channel indicated by a channel number in an area of 6 bits from the upper 11th bit.

The broadcastC in the oPCR shown in FIG. 18A and the iPCR shown in FIG.
The connection counter has a broadcast
When the transmission / reception is performed by the cast connection, the broadcast connection is performed.
Stores the number of nodes that have been set up with Tion. Also, the point-to-point connect in the oPCR of FIG. 18A and the iPCR of FIG.
point to po is included in the ion counter.
In the case where transmission / reception is performed by int connection, the number of nodes having point to point is shown.

2-10. Command and response in FCP Data transmission by Asynchronous communication
It is defined by the FCP (402) shown in FIG. Therefore, here, a transaction defined by the FCP will be described.

As FCP, Asynchronou
Write Transac specified in s communication
Tion (see FIG. 14). Therefore, the transmission of the AUX data in the present embodiment is also performed by the FCP using the Write in the Asynchronous communication.
This is performed by using Transaction. Equipment that supports FCP is Command
/ Response register, and then Command / Response as described with reference to FIG.
A transaction is realized by writing a Message to a register.

In the processing transition diagram of FIG.
As a process for the MMAND transmission, as shown in step S21, the Controller is set to Transa.
Generates a request for an action and writes
A process for transmitting a Request Packet to the Target is executed. In the target, the Write Request Pa
Receives the ticket and sends the Command / Responc
Write data to the e register. At this time, the target transmits an acknowledgment to the controller, and
r, this Acknowledge is received (S23).
→ S24). The series of processing up to this point is COMMAND
This is a process corresponding to the transmission.

Subsequently, in response to COMMAND, R
As a process for ESPONSE, a Write Request Packet is transmitted from the Target (S25). The Controller receives this, and writes data to the Command / Response register (S26). Also, Cont
In the roler, Write Request Pa
In response to the receipt of the ticket, the target receives an Ack
A nowledg is transmitted (S27). In the Target, by receiving this Acknowledg, Wr
item Request Packet is Contro
It knows that it was received by the ller (S28). In other words, CO from Controller to Target
The MMAND transmission process and the RESPONSE transmission process from the Target to the Controller responding to the MMAND transmission process are performed by FCP data transmission (Transactitivity).
on).

2-11. AV / C command packet As described with reference to FIG. 8, Asynchronous
In communication, the FCP can communicate with various AV devices using AV / C commands. In Asynchronous communication, Writ
The three types of transactions, e, Read, and Lock, are specified as described with reference to FIG.
west / Response Packet, Read
Request / Response Packet,
Lock Request / Response Pac
ket is used. In FCP, Write Transaction is used as described above. Therefore, FIG. 20 shows Write Requests.
t Packet (AsynchronousPacket (Write Reques
t for Data Block)). In the present embodiment, the Write Request Pack
et is used as an AV / C command packet.

This Write Request Pac
top 5 quadlets in ket (1st to 5th qulet
adlet) is a packet header. The first quadlet of the packet header
Area of upper 16 bits in
n_ID indicates the NodeID of the data transfer destination (destination). The subsequent 6-bit area is tl (transact label), which indicates a packet number. The next two bits are rt (retry c
ode), indicating that the packet is the first transmitted packet or the retransmitted packet. In the following 4-bit area, tcode (transaction code) indicates a command code. The subsequent 4-bit area is pri (pri
ority), which indicates the priority of the packet.

The upper 16-bit area in the second quadlet is the source_ID, and indicates the Node_ID of the data transfer source. Also, the second quadl
The lower 16 bits and the total 48 bits of the entire third quadlet in “et” are destination_offse
t, and the COMMAND register (FCP_COMM
AND register) and the address of the RESPONSE register (FCP_RESPONSE register). The above destination_
ID and destination_offset are I
This corresponds to a 64-bit address space defined in the EEE1394 format.

The area of the upper 16 bits of the fourth quadlet is defined as data_length, and data_length is described later.
The data size of a field (a region surrounded by a thick line in FIG. 20) is shown. The following lower 16-bit area is an extended_tcode area.
This area is used when extending tcode.

A 32-bit area as the fifth quadlet is a header_CRC,
A CRC calculation value for performing a checksum of the header is stored.

The 6q following the Packet header
A data block is arranged from the uadlet, and a datafi
An eld is formed. The CTS (C
ommand and Transaction Set) are described. this is,
It indicates the ID of the command set of the Write Request Packet. For example, if the value of this CTS is set to [0000] as shown in the figure, d
The content described in the “atafield” is defined as an AV / C command. That is, this Wr
The item Request Packet indicates that the packet is an AV / C command packet. Therefore, in this embodiment, since the FCP uses the AV / C command, [0000] is described in this CTS.

The 4-bit area following the CTS is ctyp
e (Command type; function classification of command) or response indicating processing result (response) corresponding to command
Is described.

FIG. 21 shows the above-mentioned ctype and respo.
The definition content of nse is shown. ctype (Comman
As d), [0000] to [0111] can be used, and [0000] is CONTROL,
[0001] is STATUS, [0010] is INCU
IRY, [0011] is defined as NOTIFY,
[0100] to [0111] are currently undefined (res
erved). CONTROL is a command for controlling the function from the outside, STATUS is a command to check the status from outside, INQUIRY is a command to inquire whether the control command is supported, and NOTIFY is a request to notify the status change to the outside. Command. Also, response
[1000] to [1111] are used, and [1000] is NOT IMPLEMENT
TED, [1001] is ACCEPTED, [101]
0] is REJECTED, [1011] is INTRAN
SITION, [1100] is IMPLEMENTED
/ STABLE, [1101] is CHANGED, [1
110] is reserved, [1111] is INTER
Each is defined as RIM. These res
Pose is used properly according to the type of command. For example, r corresponding to the command of CONTROL
As the response, NOTIMPLEMENTE
D, ACCEPTED, REJECTED, or IN
One of the four TERMs is a responder
It can be used depending on the situation on the side.

In FIG. 20, ctype / respo
In the 5-bit area following nse, subunit-t
ype is stored. Is a subunit-type
Indicates the subunit (device) of the destination of the COMMAND or the transmission source of the RESPONSE. In the IEEE 1394 format, a device itself is called a unit, and a type of a functional device unit provided in the unit (device) is called a subunit. For example, taking a general VTR as an example, a unit as a VTR includes a tuner that receives terrestrial and satellite broadcasts,
Two subs with video cassette recorder / player
It has a unit. The subunit-type is defined, for example, as shown in FIG.
That is, [00000] is Monitor, [0000]
1] to [00010] are reserved, [0001]
1] is a disc recorder / player,
[00100] is VCR, [00101] is Tune
r, [00111] is Camera, [01000]-
[11110] is reserved, [11111]
Is un used when subunit does not exist
It is defined as it.

In FIG. 20, the above subunit-t
In the 3 bits following “ype”, the same type of subunit
Is stored, an id (Node_ID) for specifying each subunit is stored.

The opcode is stored in the 8-bit area following the id (Node_ID), and operand is stored in the 8-bit area. opcod
e is an operation code, and information (parameters) required by the opcode is stored in the operand. These opco
de is defined for each subunit, and subunit
Each table has a unique opcode list table. For example, if the subunit is a VCR, opc
As the mode, various commands such as PLAY (reproduction) and RECORD (recording) are defined as shown in FIG. opera
nd is defined for each opcode.

As the datafield in FIG. 20, the 32 bits of the sixth quadlet are required, but if necessary, an operand can be added subsequently (Additional operation).
rands). Following datafield is data
a_CRC is located. If necessary, use dat
It is possible to place padding before a_CRC.

2-12. Plug Here, a plug in the IEEE 1394 format will be schematically described. As used herein, the term “plug” refers to the IEEE 1394, as described above with reference to FIG.
A logical connection relationship between devices in the format.

As shown in FIG. 23, Asynchron
The data (request) such as a command valid in the ous communication is transmitted from the producer to the cons.
transmitted to the user. The product here
er and consumer are IEEE 139, respectively.
4 A device that functions as a transmitting device and a receiving device on the interface. And the consumer
In the figure, as shown by hatching in the figure, the producer
And a segment buffer in which data writing is performed. In addition, IEEE 1394
In the system, a specific device is named producer, c
Information to specify as onsumer (Connection
Management Information) is stored at a predetermined position in a plug address indicated by a shaded line in the figure. The segment buffer is arranged following the plug address. con
The address range (data amount) that can be written to the segment buffer of the summer is c as described later.
limitCountr managed by the onsumer side
defined by the register.

FIG. 24 shows the structure of the address space of the plug in the asynchronous communication. 6
The address space of the 4-bit plug is shown in FIG.
As shown in (a), the No. of 2 16 (64K)
divided into de. The plug is located in the address space of each Node as shown in FIG. Then, as shown in FIG. 24C, each plug has a register (register) indicated by a shaded area.
er) and a segment buffer (S
egment Buffer). The register contains
As described below, the transmitting side (producer)
Information (for example, a transmission data size and a receivable data size) necessary for data transmission / reception management between the terminal and the receiving side (consumer) is stored. The segment buffer is an area where data transmitted from the producer to the consumer is to be written, and is defined to be, for example, a minimum of 64 bytes.

FIG. 25A shows plug addresses. That is, the same contents as those in FIG. 24C are shown. As shown in the figure, the register is arranged at the head of the plug address, and the segment buffer is arranged following the register. As a structure in the register, as shown in FIG. 25 (b), for example, a 32-bit producer Count re
gister is arranged, followed by 32 bits of li
mit Count register [1]-[1
4] is arranged. In other words, one producer
Count register and 14 limit C
An out register is provided. In this case, the limit Count register [1
4], an unused area is provided.

The plug structure shown in FIGS. 25A and 25B is specified by an offset address (Address Offset) as shown in FIG. 25C. That is, the offset address 0 corresponds to the consumer port (p
.., and the offset addresses 4, 8, 12,.
0 is the producer port [1] to
Specify [14]. The offset address 60 is res
Unused (unus)
ed), and a segment buffer is indicated by an offset address 64.

In FIG. 26, the producer side and the con
The structure of the plug on both the summer side is shown. A
In the synchronous communication plug structure,
By writing to the producerCount register, writing to the limitCount register, and writing to the segment buffer in accordance with the transmission / reception procedure described later, Asynchr
Implement onous communication. These writings are processing as the Write Transaction described above.

Producer Count regi
ster is a consumer by producer
Writing is performed on r. producer is
Producer Counter at own address
After writing information about the data transmission on the producer side to the register, this producer C
the contents of the "out register"
r's producer Count register
Write to. producer Count r
For the register, the producer is consume
The data size to be written to the r segment buffer is information on the data size to be written in one write process. That is, producer is p
The process of notifying the data size to be written to the segment buffer of the consumer is performed by writing the producer Count register.

In contrast, limit Count
The register is pro by the consumer
The data is written to the ducer. consum
er side, own limit Count regi
one of the s ters [1] to [14] specified in correspondence with the producer.
Write the capacity (size) of its own segment buffer to register [n], and
The contents of "out register [n]" are
Write to t Count register [n].

On the producer side, the amount of data to be written at one time is determined in accordance with the contents written to the limit Count register [n] as described above, and, for example, the data is written to its own segment buffer. . Then, the content written in the segment buffer is written to the consumer. Writing to the segment buffer corresponds to data transmission in asynchronous communication.

2-13. Asynchronous Connection Transmission Procedure Subsequently, the plug (produ) described with reference to FIG.
Assuming the structure between the “Cer-consumer” and the processing transition diagram of FIG.
A basic connection / reception procedure for connection will be described. The procedure of the transmission / reception processing shown in FIG.
Under the environment defined by the FCP, the AV / C command (Write Req
east Packet). The AUX data handled in the present embodiment is also transmitted and received in the IEEE 1394 system using this transmission / reception procedure. However, the processing shown in FIG.
Asynchronous connect only
This indicates a communication operation as an ion, and a communication process corresponding to recording and reproduction of AUX data will be described later. In addition, Asynchronous connection
Actually, the transmission and reception of the acknowledg are executed as shown in FIG. 19 in response to the command transmission, but in FIG. 27, the acknowledg is transmitted.
The illustration of the transmission / reception processing for is omitted.

In the IEEE 1394 interface, the connection relationship between the plugs (devices) is the above-mentioned p.
In addition to the producer-consumer relationship, co
There is a relationship defined as a controller-target. On the IEEE 1394 system,
The device in which the producer-consumer relationship is defined does not necessarily match the controller-target relationship in the device. That is, p
In addition to the device specified as the producer, cont
There is a case where there is a device defined as having a role of a role. However, here, the product
er-consumer relationship and contro
An example in which the relationship as ller-target matches will be described.

In the transmission procedure shown in FIG. 27, first, as shown as step S101, a connect request is transmitted from a producer to a consumer. This Connect request is made by the producer
Is a command for making a connection request to the consumer, and the address of the register of the producer is set to c.
Tell the onsumer. This Connect request is sent to the consumer as the process of step S102.
Is received, on the consumer side, prod
Recognize the address of the register of the user. Then, in step S103, co is set as the response.
nsumer is a Conne to producer
Send ct reception. Then, in step S104, the producer receives this, so that the producer-consumer for the subsequent data transmission and reception is performed.
er is established.

When the connection is established as described above, in step S105, connection is established.
er is the limit Cou for the producer.
ntregister ((hereinafter, simply “limit C
abbreviated as “out”)). Step S1
06, which has received this, by the processing of the subsequent step S107, the limit Counter
Send the t write acceptance to the consumer. Then, as the process of step S108,
r receives the limit Count write acceptance. Through a series of processing of this limitCount write request / write acceptance, the size of data to be written to the segment buffer (segment buffer capacity) is determined thereafter.

In the subsequent step S109, the pro
The segmenter sends a segment buffer write request to the consumer. Then, step S11
0, a segment buffer write request is received, and in response to this, con
The segmenter sends a segment buffer write acceptance to the producer. The producer receives the segment buffer write acceptance in step S112. By executing the processes of steps S109 to S112, the process of once writing data from the segment buffer of the producer to the segment buffer of the consumer is completed. Here, the data written by the processing of steps S109 to S112 is the Asynchronous data shown in FIG.
It is written by one transmission by a nous packet. Therefore, Asynchronous Pack
The size of the data transferred by the
Asynchronous Pac smaller than the data size specified by Count
If necessary data transmission is not completed depending on the transmission by the "ket", the processes of steps S109 to S112 are repeated as long as the capacity of the segment buffer becomes full.

Then, steps S109 to S1 described above are performed.
When the writing process to the segment buffer shown in FIG. 12 is completed, as shown in the process of step S113, p
From producer to consumer, pro
A “ducer Count register” (hereinafter simply referred to as “producer count”) write request is transmitted. In the consumer, step S11
In the process of 4, the producer Count is received and its own producer Countregis is received.
ter, and as a process of the subsequent step S115, the pr
transmitted to the Oducer. In step S116, the producer determines that the producer Cou
Receive nt write acceptance. As a result of this processing, the process of steps S109 to S112
The data size transferred from r to the segment buffer of the consumer is notified to the consumer.

The processing in the subsequent step S117 includes the process shown in steps S113 to S116.
r Limit in response to r Count write processing
A series of processes for Count writing are executed. That is, as shown in steps S117 to S120, the link from the consumer to the producer is
Transmission of a mit Count write request, and response from the producer to the consumer in response to this transmission
A mit Count write acceptance is transmitted.

The processing in steps S109 to S120 is performed by the Asynchronous Connection.
A set of procedures as a data transmission process in. Here, for example, the data size to be transmitted is larger than the segment buffer capacity, and one step S10
If it is determined that the data transfer has not been completed by the processes from 9 to S120, this step S109 is performed.
Steps S120 to S120 can be repeatedly executed until the data transfer is completed.

Then, when the data transfer is completed, as shown in step S121, the producer sets c to
A disconnect request is transmitted to the onsumer. The consumer receives the disconnect request in step S122, and transmits a disconnect acceptance in step S123. In step S124, the producer is D
By receiving the disconnect request, the Async
The data transmission / reception by the Hronous Connection is completed.

[0167] 3. Node Classification Processing As described above, the STR 60 according to the present embodiment
Other STRs such as compatible CD machine 30 and STR compatible MD machine 1
It is configured so that a component-like system can be assembled with the STR-compatible device. For this purpose, the STR 60 or the STR-compatible device performs grouping according to a predetermined rule by searching for each Node presently present on the IEEE 1394 bus and identifying its manufacturer and model. In other words, IEEE13
Classification is performed on all nodes existing on the 94 bus. Therefore, hereinafter, a node classification process as the present embodiment will be described.

First, in this embodiment, it is assumed that the nodes are defined as being classified into eight groups as follows. Here, for convenience, classification numbers # 1 to # 8 are assigned to each group. # 1: STR compatible CD machine # 2: STR compatible MD machine # 3: Same manufacturer CD machine # 4: Same manufacturer MD machine # 5: Other manufacturer's CD machine, MD machine # 6: Same manufacturer other than CD machine, MD machine Equipment (Subunit
# 7: Other manufacturer's equipment other than CD and MD machines.
t is any one of Disc, Tuner, and VCR # 8: Others Note that the above classification is a device of the same maker as STR60 with Subunit = Disc (more precisely, Disc recorder / player). , CD and MD are assumed to be connected, and devices corresponding to other disk media such as DVD are not assumed. Therefore, devices of the same manufacturer as the STR 60 are classified into one of the classification numbers # 1, # 2, # 3, # 4, and # 6.

This node classification process is performed by the IEEE
The STR 60 is executed in response to the occurrence of a bus reset in which there is a change in node management on the 1394 bus. The processing operation as this node classification processing is shown in the flowcharts of FIGS. The process shown in this figure is assumed to be executed by the system controller 70 in the STR 60 while exchanging information with the IEEE 1394 interface 61 for convenience of explanation.

The node classification processing is performed in step S shown in FIG.
It is started from 201. In step S201, I
The process waits for a bus reset to occur on the EEE1394 bus, and when the occurrence of the bus reset is detected, the process proceeds to a node classification process after step S202.

In step S202, Node
[0] is set for the ID. The following step S
As indicated by reference numeral 203, a variable i (here, i ≧ 2) corresponding to the Node ID of the Node currently selected as the type determination target (hereinafter, also referred to as “current Node”).
0) is set to [0], and at the present time after the bus reset, the number of nodes other than its own existing on the IEEE1394 bus is set to n. That is, depending on the processing from step S202 to S203, an initialization processing corresponding to the start of the node classification processing is executed.

In the next step S204, it is determined whether or not i <n holds for the current variable i and the number n of nodes other than the current variable i. In other words, IEEE13
This is for determining whether or not the processing for node classification described below has been completed for all nodes other than the own node on the 94 bus. Where i
If it is determined that <n is not established, step S
Proceed to 205.

In step S205, the Node ID indicated by the current variable i is counted. For example, when the process first reaches step S205, the node
The ID is counted as 0, and the node having this Node ID = 0 is a target of the type determination. Then, in the next step S206, the Node U of the Node selected as the current node in the above step S205
Identify the unique ID. This NodeUnique ID can be identified by referring to the Configuration ROM (FIG. 15E) of the node. For this purpose, for example, the system controller 70 accesses the address of the Node and reads the Configuration ROM.

Subsequently, in step S207, the same Node Unique ID as identified in step S206 is obtained from the node table set before the bus reset.
Is checked for a Node (equipment) having.
The node table referred to here is a table in which node classification results for each device (Node) existing on the IEEE 1394 bus are stored. Each time a bus reset occurs, a table having a new content is created.

In the next step S208, the same Node Unique ID
It is determined whether or not is found. Then, when a positive result is obtained, the process proceeds to step S209. In step S209, information on the node having the found Node Unique ID is read from the node table before the bus reset, and is set in the newly created node table. That is, for the nodes that existed on the IEEE 1394 bus even before the bus reset, the information stored in the previous node table is reused without performing the type determination described later. Then, in the next step S210, after the variable i is incremented by i ← i + 1, the process returns to step S204. In the process of incrementing the variable i, the type of the current node to be determined is
This is a process of changing according to the ascending order of the number as the Node ID.

On the other hand, if a negative result is obtained in step S208, the type determination processing in step S211 is executed. This type determination process is a process for determining a type serving as a determination material for node classification of the device (Node), and based on the determination result, among the eight groups described above. Classification into any of them is finally performed.

The type determination processing in step S211 is as follows.
As shown in FIG. In FIG. 29, first, step S
At 301, the contents of the Configuration ROM are examined. Then, in the following step S302,
The model_ID stored as the subunit ID in this Configuration ROM is identified. Depending on the model_ID, it is possible to identify the model of the node. In the next step S307, it is determined from the contents of the model_ID whether or not this node is a STR-compatible model. If a positive result is obtained, step S
The process proceeds to 304.

In this embodiment, at least STR
For a compatible model, the model_ID indicates that the model is a STR compatible model, and that the device is a CD, MD, STR
Can be identified. Therefore, in step S304, it is determined whether the model is a CD machine or an MD machine as the STR-compatible model. If it is determined that the current node is a CD machine, the flow advances to step S305 to classify the current node into the classification number # 1. If it is determined that the machine is an MD machine, the process proceeds to step S306, where the machine is classified as the classification number # 2. When the processing in step S305 or S306 ends, the process proceeds to step S212 in FIG.

If a negative result is obtained in step S303, the process proceeds to step S307, where Config
module_ve stored as subunit ID in uration ROM
Identification of the nder_ID is performed. module_vender_ID
In some cases, it is possible to identify the manufacturer name. In the next step S308, it is determined whether or not the current node is the same manufacturer model as the STR 60. Here, if a negative result is obtained, the process directly proceeds to step S310. If a positive result is obtained, the process proceeds to step S309 to set the same maker flag f to f ← 1 and then to step S309. S310
Proceed to. The same maker flag f indicates that they are not the same maker if f = 0, and indicates that they are the same maker if f = 1.

In step S310, first, a SUBUNIT_INFO command (STATUS) is transmitted to the current node. The SUBUNIT_INFO command is a command defined for notifying what the Subunit_type is in the AV / C command. Then, in response to the transmission of the SUBUNIT_INFO command (STATUS), the current node
NCE is returned, and Subunit_type is identified from the content of RESPONCE. This Subuni
Based on the identification result of t_type, the next step S3
11, the current node has Subunit_type = Disc (Di
sc recorder / Player) and only one Subunit_t
It is determined whether or not it has ype. Then, if an affirmative result is obtained, the process proceeds to step S312 and subsequent steps.

In step S312, Subunit Id
Descriptor_Acce of the content that requests the entifier Descriptor
ss command (OPEN DESCRIPTOR command, READ DESCRIPT
OR command) is transmitted to the current node, and in response to this, the media_type of the current node is identified from the contents of RESPONCE returned from the current node. Descriptor
OPEN DESCRIPTOR command as _Access command and
The READ DESCRIPTOR command is also one of the AV / C commands, and is a command used to read the Descriptor of the node. Also, Subunit Identifier D
The escriptor describes management information (TOC) on a disk medium corresponding to the node in a format compatible with the AV / C protocol. Media_type information is stored at a predetermined position in this data structure. You. The media_type indicates the type of the disc when Subunit_type = Disc.
Depending on media_type, whether it is CD or MD,
Further, it indicates whether the disc medium is another type of disc medium.

When the Descriptor_Access command is transmitted, the receiving node sets RESPONCE as
Subunit Identifier Descrip held by that node
Store and transmit part or all of tor. Then, as processing after the transmission of the READ DESCRIPTOR command in step S312, the RE transmitted from the current node is processed.
Receiving SPONCE, Subunit Iden as this RESPONCE
It identifies the contents of the media_type described in the tifier descriptor.

Then, in the next step S313, it is determined what the content of the identified media_type is. If it is determined that media_type = CD, the process proceeds to step S314. Also, media_ty
If it is determined that pe = MD, step S317
If it is determined that the media_type is other than CD or MD, the process proceeds to step S319.

At step S314, it is determined whether or not the same maker flag f = 1. If f = 1, it is determined that the type of the model is a CD machine of the same maker as STR60. Will be done. And
In this case, the process proceeds to step S315, and is classified as the classification number # 3. In contrast, step S314
If it is determined that f = 1 is not satisfied, the type is determined to be a CD machine of another manufacturer, and step S316
To the classification number # 5.

Also in step S317, it is determined whether or not the same maker flag f = 1. If an affirmative result is obtained, the type is determined to be an MD machine of the same maker. Is performed, and step S31 is performed.
8, and is classified into classification number # 4. On the other hand, if a negative result is obtained in step S317, it is determined that the type is the MD machine of another manufacturer, and classification is performed with the classification number # 5 in step S316.

In step S319, it is determined whether or not the same maker flag f = 1. If a negative result is obtained first, step S32 is performed.
The program proceeds to 0 and is classified into the classification number # 7. In other words, in this case, since the type is determined as Subunit_type = Disc by another manufacturer's device, "Classification number # 7: Subunit of Disc, Tuner, or VCR of another manufacturer's device other than CD machine and MD machine Things ". On the other hand, step S31
If a positive result is obtained in 9, Subunit_ty
Although pe = Disc, it is determined as “the same maker device other than the CD machine and the MD machine”, so that it is classified to the classification number # 6 in step S322.

If a negative result is obtained in step S311, the flow advances to step S321. The case where a negative result is obtained in step S311 means that one Subunit_type other than Subunit_type = Disc of the current node
Or the current node has multiple Subunit_ty
If you have pe. The node having a plurality of Subunit_types is, for example, a composite device in which device units for outputting two or more sources, such as a CD player, an MD recorder / player, and a tuner, are integrated.

Also in step S321, it is determined whether or not the same maker flag f = 1. If a positive result is obtained, it is determined that the device is the same manufacturer device other than the CD machine and the MD machine, and step S32 is performed.
Proceed to 2. On the other hand, when a negative result is obtained in step S321, the process proceeds to step S323. In step S323, Subunit_type = TUNER, Subunit_t
It is determined whether or not ype = VCR. That is,
A device that has only TUNER as a subunit, or VC
It is determined whether the device has only R. And
If an affirmative result is obtained as any of the above, the process proceeds to step S324. In this case, the type is determined as a device only of TUNER or VCR only of another manufacturer.
Subunit is a Disc, Tu
ner or VCR ", and are therefore classified as classification number # 7. On the other hand, if a negative result is obtained in step S323,
The type is determined to be one that does not correspond to any of the classification numbers # 1 to # 7, and the process proceeds to step S325 to be classified into the classification number # 8.

Steps S315, S316, S31
After executing the respective classification processes of 8, S320, S322, S324, and S325, the process proceeds to step S212 in FIG.

In step S212 in FIG. 28, steps S315, S316, S318, S320,
The node information about the current node formed including the results classified by the processes of S322, S324, and S325 is set in a node table created in response to the current bus reset. Then, the next step S213
In, the variable i is incremented to i ← i + 1, and if the same maker flag f is set to f = 1, this is reset to f ← 0 and the process returns to step S204.

Until a negative result is obtained in step S204, steps S205 to S21 described above are performed.
By executing the process 3, the node classification for each node existing on the IEEE1394 bus after the bus reset, that is, the setting of the node information in the node table is performed. If the node classification for all nodes is completed and a negative result is obtained in step S204, the process proceeds to step S214. In step S214, processing is executed so that the node table created by the processing so far is stored and held in, for example, the RAM. The STR 60 can execute a required system operation using, for example, the node classification result stored in the node table.

[0192] 4. Input selection order node table 4-1. Input Selection Order As described earlier with reference to FIG.
The switching of the input source in the TR 60 can be performed by rotating the jog dial 125, and the FL tube display section 75A displays the currently selected input source in response to this operation. It has become.

FIG. 30 shows an example of an input source selection order according to the rotation operation of the jog dial 125, which is set in the STR 60 of the present embodiment.
When the jog dial 125 is rotated in the clockwise direction (forward direction), for example, starting from [TUNER], every time a click interval is obtained with the rotation of the jog dial 125, the [STR compatible CD machine ( STR
-CD)] → [STR compatible MD machine (STR-MD)] →
[Same maker CD machine] → [Same maker MD machine] → [Competitor maker CD machine, MD machine] → [Same maker machine] → [di
sc] → [tuner] → [video] → [unkn
own] → [ANALOG]. When the jog dial 125 is further rotated clockwise from the state in which [ANALOG] is selected, [TUN]
ER]. When the jog dial 125 is rotated in the counterclockwise direction (reverse direction), the input source is toggled in the reverse order to the above. As described above, in the present embodiment, FIG.
The input source is toggled in the order shown in FIG. When the input source is switched by operating the jog dial 125 as described above, a predetermined character string is displayed for the currently selected input source on the FL tube display 75A. Is supposed to be. For example, when the user has actually set a unique name for the device, the name set by the user may be displayed. Also, for example, two STRs
When there are a plurality of input sources of the same type, such as when a compatible CD machine is connected, the selection of these input sources is switched in the order of NodeID, for example.

Here, of the 12 input sources whose selection order is switched as described above, [TUNER],
[ANALOG] indicates a tuner voice received and demodulated by the tuner unit 77 in the STR 60 and an external analog audio signal input from the analog input terminal 78. The other ten input sources are all devices connected via the IEEE 1394 data bus, and the classification numbers # 1 to # described above are used.
8 correspond to a group of nodes.
[STR-CD] is a STR-compatible CD machine (classification number #
[STR-MD] corresponds to a STR-compatible MD machine (classification number # 2). [Same manufacturer CD machine] corresponds to classification number # 3, and [Same manufacturer MD].
Machine] corresponds to the classification number # 4. [CD machines from other manufacturers,
MD machine] corresponds to classification number # 5, and [Same manufacturer equipment]
Corresponds to classification number # 6. That is, the “same maker device” in FIG. 30 refers to the same maker device other than the CD machine and the MD machine. [Disc], [tune
r] and [video] correspond to classification number # 7. In other words, the classification number # 7 is a device of another manufacturer other than the CD machine and the MD machine, and the Subunit is any one of Disc, Tuner, and VCR.
Disc recording / reproducing devices other than D machine and MD machine correspond.
[Tuner] corresponds to a tuner device of another manufacturer, and [video] corresponds to a VTR device of another manufacturer. Also, [unknown] corresponds to the classification number # 8, and devices that do not belong to any of the groups of the classification numbers # 1 to # 7 correspond.

The input source selection order shown in FIG. 30 is determined based on, for example, [TUNER] with consideration given to ease of use by general users. Here, for example, since it is assumed that the user often forms a system with the STR 60 and the STR-compatible device, first, [TUNER] is followed by [STR-CD] (S
TR compatible CD machine) → [STR-MD] (STR compatible MD)
Machine) is selected. As an audio device frequently used by general users, the current condition is C
Considering that the machine is a D machine or an MD machine,
Machine] → [MD machine of the same manufacturer] → [CD machine of other manufacturer, M
D machine]. Here, [Same manufacturer CD
Machine] and [Machine machine of the same manufacturer] to [CD machine of other manufacturer,
For example, if a device of the same maker is prioritized over the D device], a system operation centering on the STR 60 can be given by a command uniquely defined by the maker, if the device is of the same maker. Therefore, it is considered that there is a high possibility that the user will use it. The remaining input sources are in the order of selection as shown in FIG. 30 according to the appropriately set priority.

Note that the input source selection order shown in FIG. 30 is merely an example, and thus may be actually changed, and the number of selectable input sources may be changed. Here, for example, the selection order of the input sources is assumed to be set in advance in the STR 60. For example, the selection order of the input sources and the number of selections can be changed and set by a predetermined operation by the user. It does not matter.

4-2. Outline of Input Selection Order Node Table Creation Processing The switching of the input source shown in FIG. 30 corresponds to the result of the above-described node classification processing. However, the selection operation cannot be performed according to the input source selection order described with reference to FIG. 30 only by the node tables obtained by the node classification processing (FIGS. 28 and 29).

This is for the following reason. The node table obtained by the processing of FIGS. 28 and 29 is No.
It is created by searching for devices existing on the IEEE 1394 bus in the order of deID and collecting information. Therefore, this node table has a format managed based on the order of Node IDs. In the following, the node table obtained by the processing in FIGS. 28 and 29 is referred to as a “node ID order node table”, and an “input selection order node table” described later.
To be distinguished. Here, if the input source selected by the input source switching operation corresponds to a device existing on the IEEE 1394 bus, the STR 60 uses the node table to make a point connection with the selected device.
A process for setting to point is executed to establish a logical connection. Thus, the STR 60 inputs AV data as an output source of the selected device. In this way,
When data transfer is performed via the IEEE 1394 bus, it is necessary to establish a logical connection relationship with an external device in order to select an input source.
Since management is performed based on the D order, for example, the input selection order follows the Node ID order. That is, the input sources are not selected in the order shown in FIG.

As can be understood from the above description, the Node ID is uniquely assigned to each device in order to manage the devices currently present on the IEEE 1394 data bus. It changes dynamically every time. For this reason, if the input sources are selected in the order of NodeID, not only the selection order shown in FIG. 30 cannot be obtained, but also every time a bus reset occurs.
The input source selection order is changed, which makes it very difficult for a user to use.

Therefore, in the present embodiment, FIG.
Then, following the node classification process shown in FIG. 29, by executing the process as described below, the NodeID order node table is reorganized so as to be managed according to the input source selection order. You. This is a process of finally creating an “input selection order node table” in a format managed by the input source selection order.

To create this “input selection order node table”, first, in STR6, a Node
A data structure Gp is defined. This NodeGp
Are, as shown in FIG. 31, NodeGp [0]-
11 of [10] is prepared and the IEEE shown in FIG.
It almost corresponds to the input selection order of the external device connected by the 1394 bus. NodeGp [0] is STR compatible C
The D machine (class number # 1) is managed, and the NodeGp [1] manages the STR-compatible MD machine (class number # 2). Nod
eGp [2] indicates the same maker CD machine (classification number # 3), and NodeGp [3] manages the same maker MD machine (classification number # 4). NodeGp [4] manages CD machines of other manufacturers (category number # 5).
[5] manages another manufacturer's MD machine (classification number # 5). NodeGp [6] is a device of the same manufacturer, that is, S
It manages devices (classification number # 6) other than the CD machine and the MD machine that are the same maker as the TR60. NodeGp [7]
Is a CD among nodes classified by the classification number # 7.
Subunit manages Discs other than the MD and MD machines. NodeGp [8] is a classification number # 7
Subunit manages Tuner nodes among nodes classified by. NodeGp [9] manages, among the nodes classified by the classification number # 7, a device of another manufacturer other than the CD machine and the MD machine, of which the Subunit is a VCR. Nod
eGp [10] manages nodes classified into classification number # 8.

FIG. 32 shows a NodeID order node table (no) created by the processing shown in FIGS. 28 and 29.
(des) is conceptually shown. The NodeID order node table is actually a nodeID as shown in the figure.
It consists of two node tables, e [0] and nodes [1]. Then, one of the node tables is set as the current node table, and the other node table is set as the node table before the bus reset. That is, Nod
The eID order node table has a node table created at the time of the last bus reset and a node table before the last bus reset. Here, n
odes [0] is the current node table, and node
es [1] is the previous node table. With such a structure, as described above with reference to FIG. 28, when creating the node table, the same Node ID as the Node Unique ID of the searched device is used.
If the Node information having the eUnique ID exists in the previous node table, the node information is copied to obtain the node information of the searched device. For example, in FIG. 32, as indicated by a white arrow, NodeI
When the device of D [0] is searched, this NodeID
If the device unique ID of the device [0] is no
Since the ID is the same as the Node Unique ID stored in the node information of NODE # 1 in des [1], the contents of NODE # 1 in nodes [1] are copied and NODE # 0 in nodes [0].
Is created.

For example, nod which is the current node table
Taking es [0] as an example, nodes [0] is NOD
E # 0 to # 3 are formed by a set of four node information. This is STR60 on IEEE 1394 bus.
In addition, this corresponds to the connection of four IEEE 1394-compatible devices. The contents of each node information include, for example, [NodeID], [guid Validity],
[NodeUniqueID], [name], [ty
pe] and [next]. [Nod
In the [eID], the value of the NodeID of the Node (device) is stored. NodeID order node table is N
NodeIDs are created by searching in the order of nodeIDs, and therefore NodeIDs stored for node information NODE # 0 to # 3
Are [0], [1], [2], and [3], respectively. , [Guid Validity] is the next [NodeUni]
queID] is a flag indicating whether it is valid or invalid. [NodeUniqueID] contains the N
The value of NodeUniqueID of the mode is stored.
Here, for convenience, the values of NodeUniqueID stored in node information # 0 to # 3 are respectively
[A] [B] [C] [D].

[Name] is, for that Node,
Character information as a device name set and registered by the user on the system is stored.

[Type] indicates various types of nodes obtained based on the information collected from the node. In the case of the present embodiment, this [type] has information such as whether or not the node is a STR-compatible device, the manufacturer's distinction, and the model (Subunit). Here, the node information NODE # 0 is identified as a STR-compatible CD machine by the type of each node information in node [0], and the node information NODE # 1 is identified.
Is a STR-compatible MD machine. The node information NODE # 2 is identified as a CD machine of another manufacturer, and the node information NODE # 3 is identified as a STR-compatible CD machine.

[Next] contains, for example, nodes
If it is [0], the same t in the nodes [0]
The information which specifies the next node information in the node information number among the node information having the "type" is stored.
Therefore, in this case, since the node information NODE # 0 and the node information NODE # 3 in the node [0] are the same type as the STR-compatible CD machine, the [next] of the node information NODE # 0 Node information NO
DE # 3 is shown. In the other node information NODE # 1 and NODE # 2, null is stored in [next] because there is no other node information having the same type. Also, as node information NODE # 3, null is stored since there is no subsequent node information of the same type.

[0207] Also, nodes [1] will be briefly described. nodes [1] is the node information NOD
It is composed of three pieces of Node information E # 0 to # 2, each of which is a NodeUniqueID [E].
Since [A] and [F] are stored, before the bus reset, the NodeUniqueID other than the STR60 is used.
Three devices having [E] [A] [F] are IEEE13
This means that the connection has been made to the 94 bus. Also, as described above, [NodeUniqueID] of node information NODE # 1 in nodes [1] is no
This is information of the copy source of the node information NODE # 0 in des [0]. Therefore, [NodeUnique] of the node information NODE # 1 in nodes [1] and the node information NODE # 0 in nodes [0].
The information of [ID], [name], and [type] are the same. Here, since the IEEE 1394 format specifies that up to 63 devices can be connected, if 63 devices including the STR 60 are connected, there will be 62 devices other than the STR 60. Therefore, n
The maximum is 6 for the nodes [0] and nodes [1].
2 node information.

In the present embodiment, at the time of bus reset, for example, if the NodeID order node table shown in FIG. 32 is created, the process proceeds to the input selection order node table creation process. As a first step for this, the no specified as previously shown in FIG.
A process of grouping the NodeID order node table into groups using deGp is performed. This processing concept is shown in FIG.
3 is shown.

FIG. 33 (a) shows NodeGp, and FIG. 33 (b) shows the same Nod as shown in FIG.
The eID order node table is shown. Where Node
The structure as Gp is, for example, nodeGp [0] to [1]
1]. nodeGp [0] ~
Each block of [11] corresponds to a node type (model) as nodeGp [0] to [11] defined as shown in FIG. For example, nodeGp
The block as [0] corresponds to the STR-compatible CD machine. Each block has three data of [num] [head] [tail]. [Num] indicates the number of node information (NODE) belonging to the model defined as the current nodeGp [x] in the currently used node table. [Head] includes the current no in the node table created by the current bus reset.
Among the node information belonging to the model defined as deGp [x], for example, the address of the node information of the youngest number is indicated, and [tail] indicates the address of the node information of the oldest number. Note that initially,
In all of the nodeGp [0] to [11], [num] = 0 [head] = null [tail] = null is stored.

[0210] In the group classification process, nodeG is set according to the contents of the node table created this time.
[num] in each block of p [0] to [11]
A value is appropriately stored for [head] and [tail]. Therefore, in this case, FIG.
Nodes [0] in the node table shown in FIG.
Are stored in the nodeGp [0] to [11] in accordance with the content of the node Gp.

Here, NodeGp [0] to NodeGp [11]
Are stored sequentially. First, N
Since modeGp [0] is defined as a STR-compatible CD machine (see FIG. 30), [type] is referred to [type] in each node information NODE # 0 to # 4 of nodes [0], and [type] is defined as STR. Search for a CD that indicates a compatible CD machine. Then, in this case, the node information NO
DE # 0 and NODE # 3 are [type] = STR
It will be searched as a compatible CD machine. In addition,
When searching, look at the contents of [next],
It is possible to jump to the next node information having the same [type]. Based on the above search result, in this case, for [num] of NodeGp [0],
[2] will be stored. In [head], an address indicating node information NODE # 0 is stored.
In [tail], an address indicating Node information # 3 is stored. In this way, first, NodeGp
The storage of the value in [0] ends.

Subsequently, the process is performed for NodeGp [1]. Since NodeGp [1] is defined as an STR-compatible MD machine, nodes
From [0], node information having [type] indicating the STR-compatible MD machine is searched. Then, in this case, only the node information NODE # 1 is searched. In such a case, [n] of NodeGp [1]
For [um], [1] is stored. In this case, since only one of the node information NODE # 1 has [type] indicating the STR-compatible MD machine, the node information NODE # 1 is included in both [head] and [tail]. The address indicated is stored.

Subsequently, the process is performed for NodeGp [2]. Since NodeGp [2] is the same maker CD machine, node information having [type] indicating the same maker CD machine is searched from nodes [0]. ,
There is no node information having [type] indicating the same manufacturer CD machine. Therefore, in such a case, [num] = 0 [head] = null [tail] = null. That is, the same value as in the initial state is stored. And the next NodeGp [3] is the same manufacturer MD
However, in nodes [0], there is no node information having [type] indicating the same maker MD machine, so in this case also, [num] [head]
An initial value is stored for [tail].

The next NodeGp [4] corresponds to another manufacturer's CD machine, but there is one NODE # 2 as node information having [type] indicating another manufacturer's CD machine in nodes [0]. . Therefore, NodeG
For p [4], [num] = [1], and [he
The address indicating NODE # 2 is stored in both [ad] and [tail].

Hereafter, since node information having [type] corresponding to each block of NodeGp [5] to [11] does not exist in nodes [0],
[Num] [head] [tai
1] stores an initial value. By creating the NodeGp shown in FIG. 33A in this way, the current node table no shown in FIG.
This means that the group classification process for des [0] has been completed.

Subsequently, based on the result of the group classification process executed as described above, an input selection order node table is created as shown in FIG.

The input selection order node table is shown in FIG.
As shown in (a), it consists of one or more nodeTables storing at least pointers,
62 nodeTs from eTable [0] to [61]
able can be provided. For example, each nodeT
Null is initially stored in the “able” pointer. Also, FIG. 34 (b) shows FIG. 32 (b), FIG.
A NodeID order node table having the same contents as (b) is shown. That is, the Nod currently created and held
It is an eID order node table.

In preparing the input selection order node table, of the NodeGp [0] to [11] prepared as described above with reference to FIG.
The data contents are referred to sequentially from Gp [0]. As NodeGp [0] in this case,
Since [num] = 2, in the NodeID order node table (nodes [0]), Nod
Node information classified as a group as eGp [0] exists. Then, [h] of NodeGp [0]
Referring to [Ead], since the address of the node information NODE # 0 in the nodes [0] is indicated, first, the address indicating the node information NODE # 0 is changed to the nodeTable [0] shown in FIG. ] Is set for the pointer. In this case, referring to [next] of the node information NODE # 0, n
Since the node information NODE # 3 in the nodes [0] is indicated, the address indicating the node information NODE # 3 is changed to the nodeTable shown in FIG.
Set for the pointer in [1]. Here, referring to the node information NODE # 3, this node information NOD
Since [next] = null of E # 3, No
This means that the processing for the node information belonging to the group as deGp [0] has been completed. In the process up to this point, the addresses of the node information NODE # 0 and # 3 corresponding to the two STR-compatible CD machines are
NodeTable [0] of ID order node table
This is set for the pointer [1]. That is, two STR-compatible CD machines are first set in the input selection order. Also, as can be seen from the above process, when there are a plurality of devices of the same [type] as in this case, the input selection order (storage order in the nodeTable) is NodeI.
It follows D order. And then, NodeGp
The processing for [1] is performed.

NodeGp used as an STR-compatible MD machine
Depending on the data content of [1], as shown in FIG. 33, the Node ID order node table (nodes)
Only node information NODE # 1 in [0]) is Nod
It is shown as belonging to eGp [1]. Therefore, the node nod in the input selection order node table of FIG.
An address indicating this node information NODE # 1 is set for the pointer of eTable [2]. As a result, one STR-compatible MD machine is set following the two STR-compatible CD machines as the input selection order.

Then, the following NodeGp [2] (CD machine of the same maker) has the following value: [num] = 0 [head] = null [tail] = null and has an initial value.
In [0], there is no node information grouped as NodeGp [2]. Therefore, in this case, the next N
See modeGp [3].

NodeGp [3] is also [num]
Initial values are stored for [head] and [tail], and it is indicated that there is no node information grouped as NodeGp [3]. Next NodeGp
Reference is made to [4].

As NodeGp [4], as described with reference to FIG. 33, node information NODE # 2 in the NodeID order node table (nodes [0])
Only are shown as belonging. Therefore, FIG.
NodeTabl of the input selection order node table of (a)
For the pointer of e [3], the node information NODE #
2 is set.

When the above processing is completed, the same processing as described above is sequentially performed with reference to NodeGp [5] to [11]. In this case, FIG.
As described above, NodeGp [5] to [11] are all stored with initial values, and there is no node information belonging to these NodeGp. Therefore, nodeTable of the input selection order node table of FIG. [4]
No subsequent pointers are set. In this way, the process of creating the input selection order node table ends when the process of setting the pointer in the input selection order node table has been executed up to NodeGp [11]. In this case, as a result of setting the pointer to the input selection order node table as described above, as shown in FIG.
NodeTable [0] of input selection order node table
For pointers [1], [2] and [3], No
Addresses indicating the node information NODE # 0, # 3, # 1, and # 2 of the deID order node table (nodes [0]) are set. That is, the NodeID order node table (nodes [0]) is rearranged in the order of node information NODE # 0 → # 3 → # 1 → # 2. The order obtained by this rearrangement is the same as the STR-compatible CD machine (NODE # 0) → ST
R compatible CD machine (NODE # 3) → STR compatible MD machine (N
ODE # 1) → CD maker of another manufacturer (NODE # 2). That is, it corresponds to the input source selection order shown in FIG.

After the input selection order node table shown in FIG. 34 is created, the STR 60 controls the external devices connected to the IEEE 1394 bus by referring to the input selection order node table. Is done. Therefore, switching of the input source by rotating the jog dial 125 is also performed with reference to the input selection order node table. As a result, according to the rotating operation of the jog dial 125 as described with reference to FIG. The switching order of the input source selection is realized.

4-3. Processing Operation Next, a processing operation for creating the above-described input selection order node table will be described with reference to flowcharts of FIGS. The processing shown in FIG. 35 and FIG. 36 is performed by using the Nod shown in FIG. 28 and FIG.
This process is executed after the creation process of the eID order node table, and is always executed when the bus is reset. The processing shown in FIG. 35 and FIG.
0 is executed by the system controller 70.

FIG. 35 shows the group classification process shown in FIG. For example, assuming that the processing shown in FIGS. 28 and 29 is completed and the NodeID order node table is created and held, the system controller 70 shifts to the processing shown in FIG. Here, first, in step S401, [0] is set for a variable i indicating NodeGp [i]. Then, the following step S40
In [2], [0] is set for a variable j indicating a value as [num] (the number of node information belonging to the same group). Further, in the next step S403, No
Node information NODE in deID order node table
A variable k indicating # [k] is set. Then, in the next step S404, the NodeID order node table (nodes) created at the time of this bus reset.
Of the node information NODE # [k] is checked.

In the following step S405, ty defined as the current NodeGp [i] based on the check result in step S404 described above.
pe and [type] stored in NODE # [k]
e] is determined. Here, if a positive result is obtained, step S
Proceed to 406.

At step S406, NodeG
A value indicating NODE # [k] is set for [head] of p [i], and the process proceeds to step S407. In step S407, the variable j is incremented by j ← j + 1. Then, in the next step S408, the previous step S404 or step S4
17, it is determined whether or not [next] = null of NODE # [k]. Here, if a negative result is obtained, the same [t
[type] exists after the current node information. In this case, step S416 is performed.
To the node information indicated by [next] in the NODE #
As [n], the variable k is set to k ← n. Then, in the next step S417, NODE # which is the node information indicated by [next]
The content of [k] is checked. Then, the process returns to step S407. In this manner, as long as [next] of the current node information designates certain node information, steps S407 → S408 → S
The processing of 416 → S417 is repeated, and finally, a variable j as [num] corresponding to the number of node information having the same [type] as the current NodeGp [i] is obtained.

If a positive result is obtained in step S408, the current node information NODE # [k]
, There will be no node information having the same [type]. In this case, the process proceeds to step S409. In step S409, the current NODE #
The value indicating [k] is set to “tail” of the current NodeGp [i].
Set for Then, in the next step S410, the current variable j is set to “nu” of the current NodeGp [i].
m ”. Then, the process proceeds to step S411.

If a negative result is obtained in step S405, the flow advances to step S413 to set k
← Increment by k + 1 and proceed to step S414. In step S414, for the current variable k, k
= Full + 1 is determined. Here, “full” indicates the number of node information (NODE) in the NodeID order node table (nodes) created by the last bus reset. Therefore, for example, in the case of FIG. 33, the node information stored in nodes [0] of the NodeID order node table is NODE #
Since there are four from 0 to 3, it is determined in step S414 whether or not k = 4 + 1 (= 5). If a negative result is obtained here, there is still node information in the nodes whose contents have not been checked, so that the process returns to step S404. On the other hand, if a positive result is obtained in step S414, the node information having the same [type] as the type defined as the current NodeGp [i] is the NodeID order node table (n
odes). Therefore, in this case, the process proceeds to step S415, and the current NodeG
null for [head] [tail] of p [i]
Is stored, and the process proceeds to step S410. Then, by executing the process of step S410, in this case, [nu
[m] is stored as [0]. As a result,
[Num] [head] [ta of current NodeGp [i]
il] is left at the initial value.

Step S411 following step S410
In, it is determined whether or not i ≧ 11 for the variable i. That is, NodeGp [0] to [1]
A determination is made as to whether or not all of the value sets for [1] have been completed. If a negative result is obtained here, the variable i is incremented to i ← i + 1 in step S412, and the process returns to step S402. As a result, a process for obtaining [num] [head] [tail] data for the next NodeGp [i] is started.

Then, the setting of all the values for NodeGp [0] to [11] is completed, and step S411 is performed.
If a positive result is obtained in, the group classification process shown in FIG. 35 is ended.

After the end of the group classification process shown in FIG. 35, the flow shifts to the process shown in FIG. That is, the processing for actually creating the input selection order node table described with reference to FIG. 34 is executed. In FIG. 36, first, in step S501, the NodeGp
The variable i indicating [i] is set to i ← 0. In the next step S502, a variable j indicating nodeTable [j] in the input selection order node table is set to j ← 0.

At the next step S503, Nod
Check the contents of eGp [i]. Then, based on the check result, in step S504, num
It is determined whether or not = 0 holds. here,
If a positive result is obtained, it is determined that none of the node information in the NodeID order node table (nodes) created this time belongs to the group of the current NodeGp [i]. Therefore, in this case, the process proceeds to step S515, in which the variable i is incremented to i ← i + 1, and the process returns to step S503 to check the contents of the next NodeGp.

On the other hand, in step S504, nu is set.
If a negative result is obtained assuming that m is not 0, the node information belonging to the group of the current NodeGp [i] is stored in the newly created NodeID order node table (node).
s), but in this case, step S
Proceed to 505.

In step S505, the current Node
For a variable k indicating the number of times of setting a pointer to nodeTable [j] for Gp [i], k ←
The value is set to 0 and the process proceeds to step S506. Step S5
In 06, [head] of the current NodeGp [i]
Is set in the pointer of nodeTable [j]. The current NODE here refers to node information that the system controller 70 is currently referring to or processing.

At the next step S507, the variable j
Is incremented to j ← j + 1, and in the next step S508, the variable k is incremented to k ← k + 1. Then, in step S509, it is determined whether or not next = null is set for [next] of the current NODE currently referred to.

If an affirmative result is obtained in step S509, it is determined that there is no next node information (NODE) linked by [next] of the current NODE.
It is made to return to 3. On the other hand, if a negative result is obtained, there is at least one next node information (NODE) linked by [next] of the current NODE. In this case, The process proceeds to step S510.

At step S510, the current NODE
To the next NODE indicated by [next]. At this stage, as the current NODE, the above “next NODE”
It will be. And this time new NOD
The address of the “next NODE” that became E is nodeTa
Set to the pointer of ble [10]. Then, when this process ends, the process advances to the step S511 to change the variable j
Is incremented to j ← j + 1, and in the next step S512, k ←
Increment to k + 1. Then, Step S51
In 3, it is determined whether or not num = k holds for [num] of the current NodeGp [i] and the current variable k. If a negative result is obtained in step S513, since the node information (NODE) processed by the current nodeGp [i] still remains, the process returns to step S510. On the other hand, assuming that no node information (NODE) processed by the current nodeGp [i] remains,
If a positive result is obtained in step S513, the process proceeds to step S514.

In the step S514, the variable i is set to i
It is determined whether or not ≧ 11 holds. That is, for all nodeGp, nodeTab
It is determined whether or not the processing for setting the pointer to le has been completed. Here, if a negative result is obtained, the process returns to step S503 via the process of step S515, but if a positive result is obtained, the processes up to this point are terminated. When a positive result is obtained in step S514, the creation of the input selection order node table has been completed.

Note that the present invention is not limited to the configuration shown in the above embodiment. For example, a process of creating an input selection order node table based on a NodeID order node table created by a bus reset can be considered in addition to the processes shown in FIGS. 35 and 36. Also, here, the NodeID order node table is rearranged in accordance with the input source selection order. However, the present invention is not limited to the input source selection order, and is adapted to any other required purpose. They may be rearranged in order. and again,
In the present embodiment, the AV equipment centered on the STR is IE
Although an AV system connected by an EE1394 bus is taken as an example, the invention is not limited to this.
The present invention can be applied to other systems connected by the E1394 bus. Further, the present invention can be applied to data interfaces other than the IEEE 1394 format.

[0242]

As described above, according to the present invention, the device table information (Node ID order node table) for managing the devices currently present on the data bus based on the device ID (node ID) is determined in accordance with the predetermined device type order. Will be reorganized to be managed. This allows
For example, in a system including an external electronic device existing on a data bus and an electronic device according to the present invention, for example, when the electronic device according to the present invention realizes a certain system-like operation, this is a device ID. Since the order is performed not in the order but in the order of the device type according to the purpose, the usability of the system is improved. By setting the device type order based on the input selection order, it is possible to make the selection operation for selecting the output from the device existing on the data bus as the input source more convenient. It becomes something.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration example of an AV system as an embodiment of the present invention.

FIG. 2 is a front view showing a state of a front panel of the STR.

FIG. 3 is a front view showing a state of a front panel of the STR-compatible CD machine.

FIG. 4 is a front view showing a state of a front panel of the STR-compatible MD machine.

FIG. 5 is a block diagram showing an example of the internal configuration of an STR.

FIG. 6 is a block diagram showing an example of the internal configuration of a STR-compatible CD machine.

FIG. 7 is a block diagram showing an example of the internal configuration of a STR-compatible MD machine.

FIG. 8 is an explanatory diagram showing an IEEE 1394 stack model corresponding to the present embodiment.

FIG. 9 is an explanatory diagram showing a cable structure used for IEEE1394.

FIG. 10 is an explanatory diagram showing a signal transmission form in IEEE1394.

FIG. 11 is an explanatory diagram for explaining bus connection rules in IEEE1394.

FIG. 12: Node on IEEE 1394 system
FIG. 4 is an explanatory diagram illustrating a concept of an ID setting procedure.

FIG. 13 is an explanatory diagram showing an outline of packet transmission in IEEE1394.

FIG. 14 is a process transition diagram showing basic communication rules (transaction rules) in Asynchronous communication.

FIG. 15 is an explanatory diagram showing an addressing structure of an IEEE 1394 bus.

FIG. 16 is a structural diagram of a CIP.

FIG. 17 is an explanatory diagram showing an example of a connection relationship defined by a plug.

FIG. 18 is an explanatory diagram showing a plug control register.

FIG. 19 is a process transition diagram showing Write Transaction defined in Asynchronous communication.

FIG. 20: Asynchronous Packet
It is a structural diagram of (AV / C command packet).

FIG. 21 is an explanatory diagram showing the definition of “type / response” in an Asynchronous Packet.

FIG. 22 is an explanatory diagram showing an example of the definition contents of a subunit_type and an opcode in an Asynchronous Packet.

FIG. 23 is an explanatory diagram showing a plug structure in Asynchronous communication.

FIG. 24 is an explanatory diagram showing a plug address structure in Asynchronous communication.

FIG. 25 is an explanatory diagram showing a plug address structure in Asynchronous communication.

FIG. 26 is an explanatory diagram showing processing between plugs in Asynchronous communication.

FIG. 27: Asynchronous Connect
It is an explanatory view showing a transmission procedure as an ion.

FIG. 28 is a flowchart illustrating a node classification process.

FIG. 29 is a flowchart illustrating a type determination process in the node classification process.

FIG. 30 is an explanatory diagram showing an input source selection order according to the present embodiment.

FIG. 31 is an explanatory diagram showing the definition of nodeGp.

FIG. 32 is an explanatory diagram showing the structure of a nodeID order node table.

FIG. 33: nodeID order node table and nodeG
FIG. 9 is an explanatory diagram conceptually showing a group classification process using p.

FIG. 34 is an explanatory diagram conceptually showing an input selection order node table creation process.

FIG. 35 is a flowchart showing a processing operation for realizing the group classification processing shown in FIG. 33;

FIG. 36 is a flowchart showing a processing operation for realizing the input selection order node table creation processing shown in FIG. 34;

[Explanation of symbols]

1 STR compatible MD device, 30 STR compatible CD machine 6
0 STR, 120, 130, 150 Power key, 6
1,49,25 IEEE 1394 interface,
75, 47, 24 display

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 9/00 321 H04N 5/91 L (72) Inventor Yoshiyuki Takaku 6-7 Kita Shinagawa, Shinagawa-ku, Tokyo No. 35 Inside Sony Corporation (72) Inventor Kei Inoue 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo F-term inside Sony Corporation (reference) 5C025 AA28 BA14 BA21 BA25 CA09 CA15 CB03 DA08 5C053 FA21 FA23 GA10 GB05 GB38 HA33 JA07 KA18 KA24 LA15 5C064 BA01 BC10 BC23 BC25 BD09 BD13 5K033 BA01 EC02 EC04 5K048 BA06 DA05 HA04 HA06

Claims (3)

[Claims] 1. An electronic device which forms a communication system by being connected via a data bus of a predetermined communication format so as to be able to communicate with one or more external electronic devices existing on the data bus. The external electronic devices currently on the data bus are managed based on the device ID assigned to each electronic device currently on the data bus. For device table information composed of a set of device information having predetermined content information, a classifying unit that classifies the device information for each predetermined device type set in advance, based on a classification result by the classifying unit, for a specific purpose. Information reorganization for reorganizing the device table information so that the management is performed according to the device type order preset according to the An electronic apparatus characterized by comprising a stage, a. 2. An apparatus according to claim 1, further comprising: an input selection unit configured to select an input of source information output from the external electronic device via the data bus. The electronic device according to claim 1, wherein the electronic device is set based on an input selection order of the electronic device. 3. An electronic device which forms a communication system by being connected via a data bus in a predetermined communication format so as to be able to communicate with one or more external electronic devices existing on the data bus. An electronic device management method for managing an external electronic device, wherein an external electronic device currently on a data bus is managed based on a device ID assigned to each electronic device currently on the data bus. A classification procedure for classifying the device information for each predetermined device type with respect to device table information comprising a set of device information having information of predetermined contents for each external electronic device currently present on the data bus. Based on the classification result by the above classification procedure, management is performed according to the device type order preset for a specific purpose. As such, electronic equipment management method characterized in that it is configured to be able to execute, and information reorganization procedure to reorganize the device table information.