JPH11339386A - Av system mounting ieee 1394 serial bus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that a sound of a part of start of reproduction is not produced from a loudspeaker 21 when CD is heard, in an AV system in which an AV receiver and a CD player are connected by an IEEE1394 serial bus. SOLUTION: When a user selects a CD player 12 in a device selecting GUI screen of a handy remote control 22, an AV receiver 11 requests allotting an isochronous resource to an isochronous resource manager in parallel with switching to display of a GUI screen for operating a CD player. Thereby, after receiving allotment of an isochronous resource, the CD player 12 starts reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention includes a source device for reproducing a recording medium such as a CD player and the like.
(Formally, IEEE 1394-1995, but is abbreviated as IEEE 1394 in the present specification.) IEEE 1394 that transfers AV data via a serial bus
It relates to an AV system with a serial bus.

[0002]

2. Description of the Related Art It has been proposed that AV equipment be connected by an IEEE 1394 serial bus, and commands and AV data be transferred asynchronously and isochronously via the IEEE 1394 serial bus.

[0003]

In data transfer between devices connected by an IEEE 1394 serial bus, each device receives an allocation of a channel and a bandwidth as an isochronous resource to a node called an isochronous resource manager. Data is transferred by using the allocated isochronous resource. However, there is a case where the isochronous resource has already been allocated to another device and cannot receive the allocation of at least one of the channel and the bandwidth. For example, if the AV receiver and CD player are IEEE13
When listening to a CD, when the isochronous resources are not allocated in time and the CD player starts playing, the head of the playback audio data is sent to the AV receiver. It doesn't come and you can't hear the beginning of the song.

[0004] It is an object of the present invention to provide a device which can overcome the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION The IEEE13 of the present invention
AV system equipped with 94 serial bus (10) is IEEE1
It has a recording medium reproducing source device (12, 13) and a control device (11) connected via a 394 serial bus (14). Upon receiving an instruction from the control device (11), the recording medium reproducing source device (12, 13) reproduces the AV recording medium and, when transferring the reproduced AV data, allocates the isochronous resource first. AV after receiving
Of the storage medium for recording is started.

[0007] AV means audio (Audio) and video (Video).
V is used to include not only audio and video but also audio only and video only. That is, for example, the AV data includes not only mixed data of audio and video, but also data of only audio and data of only video. Similarly, an AV recording medium is an AV recording medium that records both audio and video (eg,
Includes not only DVDs but also AV recording media (eg, CDs and MDs) that record only audio or only video.

[0007] Source devices (12, 13) for recording medium reproduction include:
For example, AV receiver (11), MD recording / playback machine (13),
Includes DVD players, video players, and the like. Also,
Optical disk drive used in personal computers, for example, CD
It is considered that a drive device or a DVD drive device is set with a CD or DVD for audio or video, and performs reproduction and transfer of reproduced data. In such a case, a CD drive device or a DVD drive is used. The device is C
It is regarded as a type of D player or DVD player. The control device (11) is a receiver or the like in a normal IEEE 1394 serial bus AV system (10), but a personal computer of a personal computer system also controls a player or the like so that the player can play back an AV recording medium and execute the playback. In some cases, transfer is performed, and a personal computer is also included.

It is assumed that either the control device (11) or the source device (12, 13) for reproducing the recording medium may request the allocation of the isochronous resource.
In addition, the control device (11) requests the isochronous resource allocation request from the recording medium reproducing source device (12, 13).
After the instruction to reproduce the AV recording medium.
In this case, the recording medium reproduction source devices (12, 13) do not immediately start reproduction of the AV recording medium even if they receive a reproduction instruction from the control device (11), and
After the resources are allocated, the reproduction of the AV recording medium is started.

The IEEE 1394 serial bus connection device which receives the reproduction AV data from the recording medium reproduction source devices (12, 13) is not limited to the control device (11). Control device (11) and source device (12,
Other IEEE 1394 serial bus connection devices such as a recorder other than 13) may be used.

In this manner, the recording medium reproducing source device (12,
13), before the reproduction of the AV recording medium is started, the allocation of isochronous resources for transferring the reproduction AV data of the AV recording medium via the IEEE1394 serial bus (14) is secured. Even if the reproduction of the AV recording medium has started, it is possible to prevent a situation where the head portion of the reproduced AV data cannot be transferred because the isochronous resource is not allocated in time.

According to the AV system (10) equipped with the IEEE 1394 serial bus of the present invention, the control device (11) issues a reproduction instruction to the recording medium reproduction source device (12, 13) in response to the request for isochronous resource allocation. Before putting out
Isochronous and personally assigned and assigned
The resource is notified to the recording medium reproducing source devices (12, 13).

A control device (11) for issuing a playback instruction
A request for the allocation of isochronous resources is made, and after confirming the allocation, a reproduction instruction is issued, so that a series of processing becomes efficient and smooth.

According to the AV system (10) with the IEEE 1394 serial bus of the present invention, the first request for the allocation of the isochronous resource is made by the control device (11).
From a reproduction source device selection GUI screen (28) for selecting a predetermined IEEE 1394 serial bus connection device from among a plurality of IEEE 1394 serial bus connection devices, a user selects a recording medium reproduction source device (12, 13) selected by the user. This is performed when switching to the source device operation GUI screen (30).

It is uncertain whether the isochronous resource is to be allocated in response to the first request for the allocation of the isochronous resource, but usually, the allocation of the isochronous resource is received by one request and the source device is At the display stage of the operation GUI screen (30), the isochronous resources have been allocated. Therefore, the source device operation GUI screen (30) is displayed, and when the user gives a reproduction instruction on the source device operation GUI screen (30), the transfer of the reproduction AV data is performed without any trouble.

According to the AV system (10) with the IEEE1394 serial bus of the present invention, the control device (11)
However, if the source device operation GUI screen (30) is displayed but the isochronous resource cannot be allocated, the request for isochronous resource allocation is made again at appropriate time intervals. Inform the user that no assignment is received.

The fact that the isochronous resource has not been allocated yet can be determined, for example, by referring to the source device operation GUI screen (30).
Will be displayed inside. Thus, the user can accurately know that the reproduction cannot be started.

According to the AV system (10) with the IEEE1394 serial bus of the present invention, the control device (11)
However, when the source device operation GUI screen (30) is displayed and the isochronous resource cannot be allocated, the reproduction instruction is issued from the control device (11) regardless of the reproduction operation. They are not transferred to the playback source devices (12, 13).

Despite the inability to properly transfer the playback AV data from the recording medium reproducing source device (12, 13), the user erroneously displays the recording medium reproducing source device on the source device operation GUI screen (30). Even if the reproduction instruction of (12, 13) is issued, the instruction is not sent from the control device (11) to the recording medium reproduction source device (12, 13), so the recording medium reproduction source device (12, 13) In this case, inappropriate reproduction start can be avoided.

According to the AV system (10) with the IEEE 1394 serial bus of the present invention, the control device (11)
Does not release the allocated isochronous resources even when the playback of the recording medium playback source devices (12, 13) is stopped, unless the user performs an operation of closing the source device operation GUI screen (30). .

The user operates the source device (12,
The playback of the source device (12, 13) for recording medium playback may be restarted while the source device operation GUI screen (30) is displayed, although playback of the device 13) may be stopped or restarted. Therefore, by maintaining the allocation of the isochronous resource, the reproduction of the recording medium reproducing source device (12, 13) can be smoothly restarted.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of the AV system 10. The AV receiver 11, the CD player 12, and the MD recording / reproducing device 13 are based on an IEEE 1394 serial bus.
14, the AV receiver 11 asynchronously transfers commands such as playback and stop to the MD recorder / player.
13 and the IEEE 1394 serial bus 14 perform isochronous transfer of AV data generated by reproduction. IEEE
A source device 17 is connected to or disconnected from the E1394 serial bus 14 as appropriate, and the IEEE 1394 serial bus 14 has a playback function such as a tuner in addition to a source device for recording medium playback such as a DVD player or a tape player. Not including source equipment. AV receiver 11,
It transmits and receives data to and from the monitor 20 and the speaker 21 via a signal cable separate from the IEEE 1394 serial bus 14, and transmits and receives data to and from the handy remote controller 22 without light or infrared. The handy remote controller 22 includes a display unit 23 for notifying a user of information and a key 24 operated by the user.

FIG. 2 exemplifies a device selection GUI screen 28 on the display unit 23. Device icon 29 is the device selection GUI
It is arranged at the left end of the screen 28 in an aligned state. The meaning of each device icon 29 is as follows. AV master: Name example of AV system 10 AMP: Amplifier TUNER: Tuner SP: Speaker DSP: Digital signal processor INET: Internet CD: CD player 12 MD: MD recording / reproducing machine 13 TV: Monitor 20

On the device selection GUI screen 28, a device icon
In addition to the selection of 29, volume (Volume), time adjustment (Clock), and power on / off switching (Pow)
er).

FIG. 3 shows a CD player operation GUI displayed when the CD player 12 is selected in FIG.
6 is a display example of a screen 30. The CD player operation GUI screen 30 is opaquely displayed on the device selection GUI screen 28. In the figure, at present, 1 in the CD player 12 is shown.
The fifth song on the CD in the second tray is selected. By the user operating the key 24 of the handy remote control 22,
When the playback key icon 31 is selected and confirmed on the GUI screen 30 for operating the CD player (the confirmation
This is performed by operating the r key. IEEE 1394 serial bus from AV receiver 11 to MD recorder / player 13
A playback command is asynchronously transferred via 14.
When the user selects and confirms the exit key icon 32 on the CD player operation GUI screen 30 by operating the key 24 of the handy remote control 22, the CD player operation GUI screen 30 is closed and the device selection shown in FIG. GU
It returns to I screen 28.

FIG. 4 and FIG. 5 are flowcharts of a process for reproducing a CD or the like and outputting audio or video AV data from the CD player 12 or the like. The display unit 23 of the handy remote control 22 is initially set to a device selection GUI screen 28.
(FIG. 2). The user can select the device selection GUI screen
At 28, a source device for reproducing a predetermined recording medium, for example, C
When the D player 12 is selected (S40), an operation screen corresponding to the selected recording medium reproduction source device (hereinafter, device icon 29 of the CD player 12 is selected on the device selection GUI screen 28) is displayed on the display unit 23, and the CD is displayed. The description is continued assuming that the player operation GUI screen 30 is displayed.) Is called and displayed (S41). In parallel with the display of the GUI screen 30 for operating the CD player, the AV receiver 11 transmits the isochronous resources in the nodes connected by the IEEE 1394 serial bus 14.
Request manager to allocate isochronous resources. For a plurality of devices connected by the IEEE 1394 serial bus 14, an isochronous resource manager is determined according to the connection method of the IEEE 1394 serial bus 14. Therefore, the isochronous resource manager can
It can be 11 or it can be a CD player 12. Next, it is determined whether or not the isochronous resource requested to be allocated has been acquired (S43). If it can be acquired, the process proceeds to S55, and if not, the process proceeds to S44.
When the IEEE 1394 serial bus 14 is busy,
That is, when all the channels for the isochronous transfer have already been allocated, or when all the frequency bands for the isochronous transfer have been allocated, the fact is displayed on the CD player operation GUI screen 30. (S44). During this display, the operation of the playback key icon 31 on the CD player operation GUI screen 30 is invalidated, and even if the user operates (selects and confirms) the playback key icon 31, the AV receiver 11 transmits the CD player 12 to the CD player 12. Asynchronous transfer of the reproduction instruction is suspended. Thereafter, the AV receiver 11 requests the isochronous resource manager to allocate the isochronous resource at regular time intervals, for example, every second until the allocation of the isochronous resource is received (S46) (S46). When the isochronous resource is acquired, the reproduction instruction by operating the reproduction key icon 31 on the CD player operation GUI screen 30 is valid, that is, the operation of the reproduction key icon 31 by the user is accepted,
The reproduction command is transferred asynchronously from the AV receiver 11 to the CD player 12 (S47).

When the operation of the reproduction key icon 31 on the CD player operation GUI screen 30 is valid, that is, when the user selects and confirms the reproduction key icon 31 after the assignment of the isochronous resource is received. (S55) The AV receiver 11 starts receiving the isochronous resource channel (S5).
6) Asynchronously transfer the playback command to the CD player 12, and isochronously transfer the allocated isochronous resource (channel and bandwidth). The CD player 12 starts reproducing the CD and performs isochronous transfer of the reproduced audio data using the isochronous resource notified from the AV receiver 11. The AV receiver 11 is used for isochronous reproduction of audio data reproduced from the CD player 12.
When a packet is received (S58), decoding of the received data is started (S58), an audio signal is output to the speaker 21, and a reproduced sound is played from the speaker 21.

FIG. 6 is a flowchart of a process for releasing the allocated isochronous resource. When the user selects and confirms the exit key icon 32 on the CD player operation GUI screen 30 (S66), C
When the user stops on the D player operation GUI screen 30 (this stop means stop, p
ause is not included. ) To operate the CD player 12
It is determined whether or not is stopped (S67). If the user attempts to close the CD player operation GUI screen 30 while the reproduction is stopped, the user releases the isochronous resource (S67). S68) Close the CD player operation GUI screen 30 (S69) and select the device selection GUI.
Return to I screen 28. On the other hand, when the user tries to close the CD player operation GUI screen 30 even though the reproduction is not stopped, the CD player 12 still assumes that the audio data is still being transferred. Although the GUI screen 30 for CD player operation is closed, the isochronous resource is not released and the data reception is continued (S74). GU for CD player operation
When the I screen 30 is closed, the display
23 displays a device selection GUI screen 28. Device selection GUI
When the user selects the CD player 12 again on the screen 28, that is, the GUI screen for operating the CD player,
When 30 is called again, since the isochronous resource is held, the display unit 23 is switched to the CD player operation GUI screen 30 without requesting the allocation of the isochronous resource.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an AV system.

FIG. 2 is a diagram exemplifying a device selection GUI screen on a display unit.

FIG. 3 is a display example of a GUI screen for CD player operation displayed when a CD player is selected in FIG. 2;

FIG. 4 is a first part of a flowchart of a process when reproducing a CD or the like and outputting audio or video AV data from a CD player or the like;

FIG. 5 is a second part of a flowchart of a process when reproducing a CD or the like and outputting audio or video AV data from a CD player or the like;

FIG. 6 is a flowchart of a process of releasing an allocated isochronous resource.

[Explanation of symbols]

Reference Signs List 10 AV system (AV system with IEEE 1394 serial bus) 11 AV receiver (control device) 12 CD player (source device for recording medium reproduction) 13 MD recording / reproducing device (source device for recording medium reproduction) 14 IEEE 1394 serial bus 28 Device selection GUI screen (Source device selection for playback G
UI screen) 30 GUI screen for CD player operation (GUI screen for source device operation)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 5/765 5/781

Claims (6)

[Claims] An AV system (10) equipped with an IEEE 1394 serial bus having a source device (12, 13) for recording medium reproduction and a control device (11) connected via an IEEE 1394 serial bus (14), When the recording medium reproducing source device (12, 13) receives the instruction from the control device (11) and reproduces the AV recording medium and transfers the reproduced AV data, the isochronous resource , The reproduction of the AV recording medium is started.
AV system with EEE1394 serial bus. 2. A request for allocating an isochronous resource is made by the control device (11) before issuing a reproduction instruction to the recording medium reproduction source device (12, 13) and receiving the allocation. 2. The AV system equipped with an IEEE 1394 serial bus according to claim 1, wherein said isochronous resource is notified to said recording medium reproducing source device (12, 13). 3. An initial request for allocating an isochronous resource is as follows: the control device (11) requests a plurality of IEs.
Specified IE from EE1394 serial bus connection device
From the playback source device selection GUI screen (28) for selecting the EE1394 serial bus connection device, the source device operation G of the recording medium playback source device (12, 13) selected by the user is displayed.
3. The AV with IEEE 1394 serial bus according to claim 2, wherein the switching is performed when switching to the UI screen (30).
system. 4. Even if the control device (11) displays the source device operation GUI screen (30) but cannot receive the allocation of the isochronous resource, the control device (11) displays the GUI screen at appropriate time intervals. 4. The method according to claim 3, further comprising re-requesting the allocation of the isochronous resource and notifying the user that the allocation has not yet been performed.
An AV system with an IEEE 1394 serial bus as described. 5. When the control device (11) displays the source device operation GUI screen (30) but cannot receive the allocation of an isochronous resource, the control device (11) may perform the reproduction operation. 5. An AV system equipped with an IEEE 1394 serial bus according to claim 3, wherein a reproduction instruction is not transferred from said control device (11) to said recording medium reproduction source device (12, 13). 6. The control device (11) allows a user to perform an operation for closing the source device operation GUI screen (30) even while the reproduction of the recording medium reproduction source device (12, 13) is stopped. 6. The method according to claim 3, wherein the allocated isochronous resource is not released unless the operation is performed.
An AV system equipped with an IEEE 1394 serial bus according to any one of the above.