JPH07192445A - System resetting system at power supply restoration - Google Patents

Abstract

PURPOSE:To automatically make a corresponding source to be in a play state in the case where the power supply of the source being in a playing is instantaneously interrupted and restored and further to automatically stop the source being in the playing and also to make the holding content of a management unit coincide with the content of a system in the case where the power supply of the management unit is instantaneously interrupted and restored. CONSTITUTION:In the case where the power supply of a prescribed source 31 is restored after an instantaneous interruption, a start-up information is transmitted from the corresponding source to a management unit 21 and then the management unit judges whether a source transmitting the start-up information is the source being in the playing or not, and makes the corresponding source to be in the play state when the source is the source being in the playing. Further, in the case where the power supply of the management unit 21 is restored after an instantaneous interruption, the unit transmits the start-up information toward all sources and each source receiving the start-up information from the management unit initializes its state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system resetting method when power is restored, and more particularly to a system resetting method when power is restored when the power supply of a management unit or source of an audio / visual system is restored after a momentary interruption. .

[0002]

2. Description of the Related Art There is an audio-visual system in which a plurality of audio sources or video sources, an operation unit which is a user interface, and a central control unit are connected by a communication line. In such a system, the source switching instruction, the power on / off instruction for each source, and the individual operation instruction for each source are all issued from the operation unit via the centralized management unit. 20 is a conceptual representation of a conventional system, where 1a is an operating unit, 2 is a central management unit, 3a, 3b, 3c ... Are a plurality of audio sources or video sources.

In such a system, when the AM / FM tuner (assuming the source 3a) is to be activated, the AM / FM tuner key is pressed on the operation unit 1a.
By this key operation, the operation unit 1 requests the centralized management unit 2 to activate the AM / FM tuner 3a, and when the other audio source is operating, the centralized management unit 2 activates the other audio source. Turn off, then AM
/ Starts the FM tuner 3a. When the band switching key, preset tuning key, seek key, etc. are pressed on the operation unit 1a while the AM / FM tuner 3a is operating, each request is made to the centralized management unit 2, and the centralized management unit 2 receives the request. AM / FM tuner 3 on request
A is controlled to execute band switching, preset channel selection, seek operation, and the like. Such control is performed for all audio sources (tape players, CD players, etc.) and video sources.

[0004]

However, such a control method has a problem that it cannot cope with the addition of a new source or a new operation unit. For example, considering the case where a navigation system, a CD changer, or an operation section corresponding to these sources is added to the above system, the centralized management unit 2 is configured in advance so as to be able to meet special operation requests for these navigation system and CD changer. Must be However, it is difficult to configure the centralized management unit in advance so as to be compatible with a new source, and in the end, there is a problem that the conventional method cannot support addition of a new source or a new operation unit. In addition, in an in-vehicle system or the like, the operation unit may be placed in front of or behind the vehicle, or may be operated by a remote control unit.
As shown by the dotted line in FIG.
・ Provided. In such a case, various requests are issued to the central management unit 2 from each of the operation units 1a to 1c. For this reason,
There is a problem that the load of the centralized management unit 2 increases, high-speed processing cannot be performed, and it takes time to switch the sources, takes time to execute the instructed operation, or is ignored.

From the above, the applicant of the present application, in another application dated the same as this application, causes the system management unit to perform normal source switching and source switching control by interruption.
We propose an audio-visual system that controls the operation of each source by instructing the source directly from the operation unit (commander) which is a user interface. According to this audio-visual system, it is possible to reduce the load on the management unit and, in addition, to cope with the addition of new sources, operation units, and interrupt sources, and to provide a flexible audio-visual system. By the way, in such a system for performing source switching control, when the power source of each source or the management unit is momentarily cut off for some reason and then restored, there are the following problems.

The first problem is that the power source of the source being played is restored after a momentary interruption. The source is stopped to initialize the internal state when the power is restored (when the power is turned on). It is the management unit that puts this source into a play state, but the management unit does not know that the source was stopped due to power down. In other words, the management unit recognizes that the source is playing and does not control the source to be in the playing state. For this reason, the source cannot automatically output sound when power is restored. In some systems, even if the commander is operated to select the source, the management unit recognizes that the source is being played and may not perform control for bringing the source into the playing state. In this case, select another source once,
After that, the original source must be selected, and the operation performance deteriorates.

The second problem is that the power supply of the management unit is restored after a momentary interruption. Since the management unit initializes the internal state when the power is restored (when the power is turned on), it does not know which source is playing at the time of restoration. Therefore, there is a problem that the play state of the source cannot be stopped, and the source continues to play without permission. By the way, when a new source selection is instructed by the commander or the like, the management unit stops the source being played and then plays the selected source. However, when the power is restored, the management unit cannot recognize which source is being played, so that there is a problem that the selected source cannot be put in the playing state or that the two sources are put in the playing state at the same time. From the above, an object of the present invention is to provide a system resetting method at the time of power restoration, which can automatically put the source in a play state when the power source of the source being played is momentarily cut off and then restored. . Another object of the present invention is to automatically stop the source being played when the power supply of the management unit is momentarily cut off and then restored, and moreover, match the contents held in the management unit with the contents of the system. It is to provide a system reconfiguration method when power is restored.

[0008]

FIG. 1 is a diagram for explaining the principle of the present invention. 11 and 12 are a plurality of commanders that are user interfaces, 21 is a system management unit,
31, 32, ... are audio sources, 41, 42 ...
..It is a video source. Reference numerals 21a and 31a are controllers, and PWC is a power supply control unit.

[0009]

The audio sources 31, 32, ... And / or the video sources 41, 42 ..
1. The commanders 11, 12 are connected by a communication line, and the system management unit 21 is requested to switch the sources from the commanders 11, 12, ... Or individual sources. The system management unit 21 controls activation of the source instructed based on the source switching request and stop of the source which has been operating until then via a communication line. When the power source of the predetermined source 31 is restored after a momentary interruption, the startup information is transmitted from the source to the management unit 21, and the management unit determines whether the source that transmitted the startup information is the source being played, If it is a source, the source is put in a play state. As a result, the power source of the source being played momentarily cuts off,
Then, when the source is restored, the source can be automatically placed in the play state. When the power supply of the management unit 21 is restored after a momentary interruption, the management unit transmits start information to all the sources, and each source receiving the start information from the management unit initializes its own state. As a result, when the power supply of the management unit 21 is momentarily cut off and then restored,
The source being played can be automatically stopped, and the contents held by the management unit and the contents of the system can be matched.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (a) Overall Configuration of Audio-Visual System FIG. 2 is an overall configuration diagram of an audio-visual system according to the present invention, which is a system management unit (SCU: Sys).
tem control unit) as an independent unit. As will be described later, the system management unit can be included in the head unit or the commander. 11,
12 is a commander (operation unit) which is a user interface, 21 is a system management unit (SCU), 31 is a head unit (HU), for example, an AM / FM tuner, a cassette tape player, a CD as an audio source.
Have a player. 32 is a cassette player, 33
Is a CD player, 34 is a DAT player, 35 is a digital audio source such as a mini disk player or a DCC (digital compact cassette) player, and 36 is A.
The M / FM tuner 37 is an audio processor. The reason that there is an audio source that overlaps with the audio source that constitutes the head unit (HU) 31 is that there is a case where it is desired to incorporate a higher-performance audio source than the audio source of the head unit into the system and enjoy it. Further, depending on the system, the audio source may be only the head unit or may not have the head unit, so that an arbitrary configuration can be adopted.

41 is a TV tuner
R) and 43 are navigation systems. The video source can have an arbitrary configuration like the audio source, and there are a system without a video source, a system with only a TV tuner, a system including all video sources, and the like. Reference numerals 61 and 62 are amplifiers for amplifying audio signals, 63 is a visual monitor, for example, a liquid crystal display, and 64 is a remote controller.

71 (one diagonal line in the center of the line)
Is a cable having lines such as a bus line (communication line) and an analog audio signal line (L, R), and connectors 72 are connected to both ends thereof. Reference numeral 73 (there are two diagonal lines in the center of the line) is a cable used to connect the video composite display signal of the video unit, and has lines such as a video composite signal line and a remote control signal line,
Connectors 74 are connected to both ends. Reference numeral 76 is an audio cable for transmitting an analog audio signal, 77
Is an optical fiber that transfers digital data, has optical connectors at both ends, and an optical transmitter (E
/ O converter) is connected, and an optical receiver (O / E converter) is connected to the receiving side optical connector.

A communication line 71 'included in the cable 71
As shown in FIG. 3 (a), each unit UNT is internally connected to the through and the controller CN of each unit is connected.
Connected with T. The controller CNT takes in data sent from another unit via the communication line and performs a predetermined control, and can send the data to the other unit by putting the data on the communication line. With this configuration, all the units connected by the communication line 71 'can communicate with each other. The data is transferred bidirectionally on the communication line. The analog audio signal line 71 ″ is connected inside the unit UNT as shown in FIG. 3 (b), and the selector SEL receives the analog audio signal A1 and the audio source ADS sent from the previous unit in accordance with the instruction from the controller CNT. One of the audio signals A2 output from the unit is selected and transferred to the unit at the next stage, which is through-connected inside the unit having no audio source.
Therefore, the analog audio signal output from the predetermined audio source reaches the audio processor (AP) 37 through the analog signal line 71 ″, where it is subjected to audio signal processing and output to the amplifier.

Similar to the analog audio signal line, a predetermined image signal is selected in each part of the video signal line, passes through each video unit, reaches the visual monitor 63, and is displayed on the display screen. The optical fiber is connected to the audio processor 37 via another digital audio source or directly. The audio processor 37 selects predetermined digital audio data, DA-converts it, and outputs it to the amplifiers 61 and 62.

The remote control signal output from the remote control 64 is received by the remote control light receiving section provided inside the commander 11 and the visual monitor 63. Upon reception of the remote control signal, the commander 11 sends out a predetermined command to the communication line based on the instruction from the remote control as in the case of the instruction by the key operation. Upon receiving the remote control signal, the visual monitor 63 sends the remote control signal to each video unit via the cable 73. Since the remote controller 64 can instruct the individual operation of each video unit, each video unit takes in the remote control signal and executes the instructed operation.

(B) Frame format Data transfer on the communication line (bus) of the cable 71 is performed in frame units. That is, the transmission source unit adds a destination address, a transmission source address, an error detection code, etc. to transmission data to generate a frame, and sends the frame to the bus. The frame carries the communication line,
A unit having the same address as the destination address included in the frame takes in the frame and performs a predetermined operation.
FIG. 4 shows a frame format, where DA is a destination address, SA is a source address, DATA is transmission data, and C is
HECK CODE is an error detection code.

(C) Configuration of each unit System management unit (SCU) FIG. 5 is a configuration diagram of the system management unit, 21 is a system management unit, 72a is an analog input side connector, and 72b is an analog output side connector. Is. 21a
Is a controller with a microcomputer configuration that performs centralized management control such as source switching and power on / off. All the signals from the previous stage input from the connector 72a are output side connector 7
The next unit is input via 2b. Further, data flows bidirectionally on the communication line, and the controller 21a takes in the data addressed to itself or the broadcast communication data and sends out the data according to the format shown in FIG. 4 to the bus. The controller 21a executes audio / video source switching control via the bus (communication line) 71 in accordance with source switching requests from the commanders 11 and 12 (FIG. 2) and each source, and power-on / off control of the entire system. And so on.

[Commander] FIG. 6 is a block diagram of the commander, in which 11 is a commander and 72 is a commander.
Reference numeral a is an analog input side connector, and 72b is an analog output side connector. Reference numeral 11a is a controller having a microcomputer configuration, 11c is a key input section for instructing activation of each source (source switching), start / stop of original function of each source, and the like.
Reference numeral 11d is a display unit, and 11e is a remote control light receiving unit.

All the signals from the previous stage input from the connector 72a are input to the unit in the next stage via the output side connector 72b. Further, the controller 11a takes in data addressed to itself via the bus, and data in response to key operation or remote control operation according to the format shown in FIG. 4 (data for requesting source activation or execution / stop of function unique to source). Create and send to the bus (communication line). The commanders include a commander for an audio unit, a commander for a video unit, a commander for navigation, or a commander that combines these.
Each commander is provided with a source switching key and a key for instructing an individual operation of each unit. For example, an audio unit commander is provided with AM / FM keys, tape keys, CD keys, etc. for source selection, band switching keys, preset set keys, seek keys, etc. for AM / FM, Play keys, fast forward / rewind keys, Dolby on / off keys, etc. are provided for tape players, play keys, song number up / down keys, etc. are provided for CD players, and other numeric keys, volume up / down keys, bus, etc. / Treble key etc. are provided.

Configuration of Head Unit FIG. 7 is a configuration diagram of a head unit (HU), 31 is a head unit, 72a is an analog input side connector,
72b is an analog output side connector, and 77b is an optical connector. In the head unit, 31a is a controller having a microcomputer configuration, 31c is a digital audio source (CD player, DAT player, mini disk player, DCC player, etc., not limited to one), 31d.
Is an analog audio source (cassette tape player, AM / FM tuner, etc., not limited to one), 3
1e is a DA converter, 31f is an audio processing unit, 31g
˜31h are selectors, and 31k and 31m are mute circuits for cutting noise and unnecessary sounds due to output switching. Also, 31s is an audio amplifier, and 31t is a power fader. When the head unit is used alone, the output of the power fader 31t is input to the in-vehicle front and rear speakers. However, when the head unit 31 is incorporated in the system shown in FIG. 2, nothing is connected to the output terminal of the power fader 31t.

The audio signal A1 from the preceding stage input through the connector 72a, the audio signal A2 output from the analog source 31d, and the digital source 31
Of the audio signals A3 obtained by DA converting the output of c, any one of the audio signals is selected by the selector 31g under the control of the controller 31a and sent to the unit at the next stage. For example, when the activation of the analog audio source 31d is instructed via the communication line, the controller 31
a selects the audio signal A2 from the analog source 31d and sends it to the next stage. Similarly, when the activation of the CD player is instructed, the audio signal A3 output from the DA converter 31e is selected and sent to the next stage, and when the activation of any audio source is not instructed, it is input from the previous stage. The selected audio signal A1 is selected and sent to the next stage.
Also, the digital data output from the digital audio source 31c is input to the audio processor 37 via the optical connector 77b.

Analog Audio Source FIG. 8 is a block diagram of an analog audio source such as a cassette tape player or an AM / FM tuner. 32 is an analog audio source, 72a is an analog input side connector, and 72b is an analog output side connector. Three
Reference numeral 2a is a controller having a microcomputer configuration, 32c is an analog audio source, 32d is a selector, and 32e is a circuit for removing unnecessary sound (inter-station noise of the tuner or sound at the time of music scanning of tape) generated from the source. One of the analog audio signal A1 from the previous stage input via the connector 72a and the audio signal A2 output from the analog audio source 32c is selected by the selector 32d under the control of the controller 31a and sent to the unit of the next stage. For example, when the activation of the analog audio source 32c is instructed via the communication line, the controller 32a selects the audio signal A2 and sends it to the next stage. On the other hand, when the activation of the analog audio source 32c is not instructed, the audio signal A1 input from the previous stage is selected and sent to the next stage.

Digital Audio Source FIG. 9 is a block diagram of a digital audio source such as a CD player and a DAT player. 33 is a digital audio source, 72a is an analog input side connector, 72b
Is an analog output side connector, 77a is an input side optical connector, and 77b is an output side optical connector. 33a is a controller having a microcomputer configuration, 33c is a digital audio source (CD player, DAT player, mini disk player, DCC player, etc.), 33d is a DA converter, 33f to 33g are circuits for cutting unnecessary sound, 33h,
Reference numeral 33i is a selector, and 33j is a changeover switch for switching the audio output to digital / analog.

When the audio output changeover switch 33j selects analog, the controller 33a selects one of the analog audio signal A1 input from the previous stage through the connector and the audio signal A2 output from the DA converter 33d. It is selected by the selector 33h and sent to the next unit. On the other hand, the audio output changeover switch 33j
If is selected as digital, the controller 33
a is a selector 33i for selecting one of the digital audio signal D1 from the previous stage and the digital audio signal D2 from the digital audio source 33c input via the optical connector 77a, and the digital audio source of the next stage via the optical connector 77b. Or send to audio processor.

Audio Processor FIG. 10 is a block diagram of an audio processor. 37 is an audio processor (AP), 72a is an analog input connector, 76a-1 to 76a-4 are connectors for inputting an audio signal to an amplifier, 77a- 1 to 77a-2 are optical connectors for optical input. 37a is a controller having a microcomputer configuration, 37c
Is a digital signal processor, 37d is an analog signal processor,
37e is an AD converter, 37f is a DA converter, 37h, 3
7j is a selector.

The analog audio signal A1 input from the previous stage is input to the AD converter 37e, converted into a digital signal here, and then input to the digital signal processing unit 37c via the selector 37j. Further, the digital audio signal is input to the digital signal processing section 37c via the selectors 37h and 37j. The controller 37a controls each selector to select the audio signal output from the instructed audio source and input it to the digital signal processing unit 37c. The digital signal processing unit 37c performs digital signal processing, and the DA converter 37f converts the digital signal processing unit output into an analog signal and inputs the analog signal to the analog audio signal processing unit 37d. Analog signal processing unit 3
7d performs predetermined analog signal processing (volume, front / rear volume ratio, left / right volume ratio, mute control, etc.) and inputs it to the amplifier.

TV tuner FIG. 11 is a block diagram of the TV tuner. 41 is a TV tuner, 72a is an analog input side connector, 72b is an analog output side connector, 73a is a connector for outputting a video signal and receiving a remote control signal, and 78 is a television antenna terminal. Reference numeral 41a is a controller having a microcomputer configuration, 41c is a TV tuner, 41e is a selector, and 41f is a circuit for removing unnecessary sound from the source. The controller 41a controls the selector 41e to control the T
One of the audio signals A1 and A2 input from the V tuner and connector 72a is selected and output from the connector 72b. In addition, the controller 41a controls the video signal V output from the TV tuner.
1 is output from the connector 73a.

Navigation Unit FIG. 12 is a block diagram of the navigation unit. 43
Is a navigation unit, 72a is an analog input side connector, 72b is an analog output side connector, 73
Reference numerals a and 73b are video signal input / output connectors, and 79 is a GPS antenna terminal. In the navigation unit, 43a is a controller having a microcomputer configuration, and 43c
Is a GPS tuner, and 43d is a CD storing map data
-ROM, 43e is an image processing unit for generating a map image based on the map data read from the CD-ROM, 43
f is a selector. The audio signal input from the connector 72a passes through the inside of the navigation unit and is output from the connector 72b. On the other hand, the video signal is selected by the selector 43f and output from the connector 73b to the video unit at the next stage. That is, the controller 43a
Controls the selector 43f to control the video unit (TV
Video signal V1 input from the tuner and the image processing unit 4
One of the video signals V2 (map image) created in 3e is selected and output.

Configuration diagram of visual monitor FIG. 13 is a configuration diagram of a visual monitor. Reference numeral 63 is a visual monitor, and 73a is a connector for video signal input and remote control signal output. 6 on the visual monitor
3a is a remote control light receiving unit, 63b is a liquid crystal panel, 63c is a backlight unit, and 63d is a liquid crystal driving logic unit.
The visual monitor transmits the remote control signal received by the remote control light receiving unit 63a to another video unit via the connector 73a, and displays an image on the liquid crystal panel based on the video signal input from the connector 73a.

(D) Processing of system management unit Next, processing of the system management unit 21 will be described. (d-1) Audio source switching FIG. 14 is a procedure explanatory diagram when switching the source from the tuner to the cassette tape player. When the tape cassette is inserted while the tuner is operating (pack-in detection: S1), the tape player issues a request command (AUDIO = TAPE) for switching the audio source to the tape player, to the system management unit (SCU). 21 (S2).

The system management unit 21 issues a system status request to the tape player in order to confirm whether or not the tape player actually exists in response to the request (S3). When the tape player receives the system status request, it returns a system status response to notify the presence (S4). After confirming the presence of the tape player, the system management unit 21 issues a mute on command to the audio processor (AP) 37 (S5). Upon receiving the mute on command, the audio processor turns on mute (S6). Thereafter, the system management unit 21 issues a tuner select off command to the tuner (S7), and the tuner turns off its power according to the command (S7).
8). Next, the system management unit 21 issues a tape select command to the tape player (S
9). The tape player turns on his power by this command and starts playing (S10).

Thereafter, the system management unit 21 issues an analog input select command to the audio processor 37 (S11). Audio processor 3
7 selects the signal input from the analog connector 72a by this command (S12). Next, the system management unit 21 issues a mute off command to the audio processor 37 (S13). Upon receiving the mute off command, the audio processor mutes off, inputs the audio signal from the tape player to the amplifier, and outputs sound from the speaker (S14).
After that, the system management unit 21 notifies the tape player that issued the source switching request of the execution result (S1).
5) A series of source switching processing is completed. When the source switching fails for some reason, NG is returned as the execution result, and when the source switching is successful, OK is returned as the execution result. The above is the case where the insertion of the tape cassette is detected and the source switching request is issued from the audio source, but it goes without saying that the commander can issue the source switching request. In this case, when the system management unit SCU receives the source switching request from the commander, it performs source switching in the procedure shown in FIG. 14, and finally returns the execution result to the commander.

(D-2) Video source switching FIG. 15 is a diagram for explaining the procedure for switching the video source from the TV tuner to the navigation unit. When "navigation power on" of the remote controller 64 is pressed while the video from the TV tuner is displayed on the monitor (S1), the navigation unit 43 detects the pressing from the remote control signal and sets the video source to the navigation unit. Request command for switching (NA
A VI select request command) is sent to the system management unit 21 (S2). Upon receiving the request, the system management unit 21 issues a system status request to the navigation unit 43 to confirm whether the navigation unit actually exists (S3).
When the navigation unit 43 receives the system status request, it returns a system status response to notify the presence (S4).

When the system management unit 21 confirms the existence of the navigation unit, it issues a video = NAVI select command to the navigation unit (S5). The navigation unit 43 turns on the power by this command (S6). Thereafter, the system management unit 21 issues a video select off command to the TV tuner (S7), and the TV tuner turns off its power (S8). Then, the system management unit 21 notifies the navigation unit that issued the source switching request of the execution result (S
9) A series of source switching processing is completed.

(D-3) ACC power-on control FIG. 16 is a diagram for explaining a procedure in which a unit that was operating when the ACC power was turned off is stored and the power of the unit is turned on to operate when the ACC power is turned on. is there. When the system management unit 21 detects the ACC signal (= 14V), it issues a system status request to the audio processor (AP) and confirms the presence of the audio processor (S1). When the audio processor 37 returns a status response to the request (S2), the system management unit 21 identifies the unit (a tuner) that was operating when the power was turned off from the information stored in its own memory. , Issues a system status request to the tuner and confirms the existence of the tuner (S3). When the tuner returns a status response to the request (S4), the system management unit 21 issues a tuner select command to the tuner (S5). The tuner turns on its own power in response to the command (S6).

Next, the system management unit 21 issues a power-on command to the audio processor 37 (S7). The audio processor 37 turns on its own power in response to the command (S8). After that,
The system management unit 21 is an audio processor 37.
An analog input select command is issued to (S9). The audio processor 37 selects the audio signal input from the analog connector 72a by this command (S10). After that, the system management unit 21 issues a mute off command to the audio processor 37 (S11). Upon receiving the mute off command, the audio processor mutes off, inputs the audio signal from the tuner to the amplifier, and outputs sound from the speaker (S12).

(D-4) Control at power restoration-Slave power interruption / recovery control FIG. 17 is a process flow chart at slave (source) power interruption / restoration. When the power of a predetermined slave, for example, the cassette player 32, is momentarily cut off during play, and thereafter, the power is restored and the power is stabilized (steps 101 to 103)
The controller of the cassette player 32 initializes the memory and registers (step 104), and thereafter broadcasts the start information to all units (step 10).
5). After that, the cassette player 32 waits until it receives the source select command from the system management unit 21 which is the master (step 106). When the system management unit 21 receives the activation information (step 2
01), it is checked whether or not the cassette player (starting information sending source) that has sent the starting information is the same as the source being played which is recognized by the player (step 202). If it is different, nothing is done, and if it is the same, a source select command is issued to put the source (cassette player) into a play state (step 203). Cassette player 3
2 receives the source select command and enters the play state and outputs a sound (step 107). As mentioned above,
When the power source of a predetermined source is restored after a momentary interruption, the start information is transmitted from the source to the system management unit 21, and the system management unit determines whether the source that transmitted the start information is the source being played, and is playing. If the source is, the source is put into a play state. As a result, when the power source of the source being played is momentarily cut off and then restored, the source can be automatically put into the play state and can be brought into the same state as before the power source interruption.

Control at power interruption / restoration of master FIG. 18 is a flow chart of processing at momentary power interruption / restoration of the master (system management unit). When the power supply of the system management unit 21 is momentarily cut off and then restored and the power supply becomes stable (steps 301 to 302), the system management unit 21 initializes the internal state (step 30).
3) Broadcast start information to all units (step 30)
4). The unit in play which has received the activation signal issued from the system management unit 21 immediately stops (steps 401 to 403) and initializes its internal state (step 404). In addition, the source which is not playing initializes the internal state. As described above, when the power supply of the management unit 21 is momentarily cut off and then restored, the source being played can be automatically stopped, and the contents held in the management unit and the contents of the system can be matched.

(E) Instruction for operating unit The instruction for the operating unit is given to the unit directly from the commander or the remote controller. For example, currently AM /
When the FM tuner is in operation, preset tuning, seek, band switching operation, etc. are performed using the keys or the remote control, and such operation instructions are transferred directly from the commander to the tuner via the communication line, and the tuner operation is performed. Control. The same applies to other audio sources and video sources. In the embodiment, it is possible to issue an operation instruction to the video source from the remote controller and send a remote controller signal to each video source via the remote controller line for control.

(F) Another configuration diagram of the audio-visual system In the audio-visual system of FIG. 2, the system management unit 21 is provided independently. Considering the hardware configuration of the system management unit 21, the commander 11
And a partial hardware configuration of the head unit 31. Therefore, the function of the system management unit 21 is changed to the controller 11a of the commander 11 and the head unit 31,
It is possible to have 31a. FIG. 19 is a block diagram of such an audio-visual system, in which the head unit 31 (or commander 11) has the function of a system management unit, and the same parts as those in FIG. . 31 'is a head unit and system management unit (HU.SCM). The head unit may further include a commander.

The present invention has been described above according to the embodiments.
The invention is not limited to the examples. That is,
Although FIG. 2 and FIG. 19 show the case where the system is configured using a considerable number of units, the present invention does not need to include all of these units, and the system may be configured using appropriate units. It is applicable.
It is also possible to incorporate another unit not shown in the embodiments. The present invention has been described above with reference to the examples.
The present invention can be variously modified according to the gist of the present invention described in the claims, and the present invention does not exclude these.

[0042]

As described above, according to the present invention, when the power source of a predetermined source is restored after a momentary interruption, the source sends start information to the management unit, and the management unit sends the start information to the source being played. Since it is configured to judge whether it is a source and put it in the play state if it is the source being played, when the power source of the source being played is restored after a momentary interruption, the source is automatically placed in the play state. Yes, it can be in the same state as before the power interruption. Further, according to the present invention,
When the power of the management unit is restored after a momentary power failure, the startup information is sent from the management unit to all sources, and each source that receives the startup information from the management unit initializes its own state. When the power supply of the unit is restored after a momentary interruption, the source being played can be automatically stopped, and the contents held in the management unit and the contents of the system can be matched.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an overall configuration diagram of an audio / visual system of the present invention.

FIG. 3 is an explanatory view of connections between units.

FIG. 4 is an explanatory diagram of a frame format.

FIG. 5 is a configuration diagram of a system management unit.

FIG. 6 is a block diagram of a commander.

FIG. 7 is a configuration diagram of a head unit.

FIG. 8 is a configuration diagram of an analog audio source.

FIG. 9 is a configuration diagram of a digital audio source.

FIG. 10 is a configuration diagram of an audio processor.

FIG. 11 is a block diagram of a TV tuner.

FIG. 12 is a configuration diagram of a navigation unit.

FIG. 13 is a configuration diagram of a visual monitor.

FIG. 14 is an explanatory diagram of a procedure when the source is switched from the tuner to the tape.

FIG. 15 is an explanatory diagram of a procedure when a source is switched from TV to NAVI.

FIG. 16 is an explanatory diagram of a processing procedure when the ACC power is turned on.

FIG. 17 is a processing flow diagram at the time of momentary power failure / restoration of a slave (source).

FIG. 18 is a process flow diagram at the time of momentary power failure / restoration of a master (management unit).

FIG. 19 is an overall configuration diagram of another audio-visual system.

FIG. 20 is a diagram illustrating a conventional problem.

[Explanation of symbols]

11, 12 ... Multiple commanders that are user interfaces 21. System management unit (SCU) 21a, 31a Controller 31 32 Audio source 41 42 Video source PWC Power control unit

(72) Inventor Koichi Sato 1-8 Nishigotanda, Nishikawa, Shinagawa-ku, Tokyo Alpine Electronics Inc. (72) Tadashi Sano 1-18-8 Nishigotanda, Shinagawa-ku, Tokyo Alpine Within the corporation

Claims (2)

[Claims] 1. A system resetting method at power restoration of an audio-visual system in which a plurality of audio sources and / or video sources and a management unit are connected by a communication line, and the sources are switched under the control of the management unit. When the power source of the source is restored after a momentary interruption, the source sends start information to the management unit, and the management unit determines whether the source that transmitted the start information is the source being played, and if it is the source being played. A system resetting method at the time of power restoration, characterized in that the source is put in a play state. 2. When the power of the management unit is restored after a momentary power failure, the management unit sends start information to all sources, and each source receiving the start information from the management unit initializes its own state. The system resetting method at the time of power restoration according to claim 1.