JP2003069585A - Power supply control method and electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient power supply control for a device connected to a network with a bus line such as the IEEE1394 method so that the occurrence of unnecessary bus reset is prevented. SOLUTION: In a device 100 connectable with other devices through a digital communication bus that can transmit digital data, a section processing communication through a digital communication bus 11 is made to be able to stay on inactive status so that, when the device 100 is turned ON, a bus reset would not occur on the network to which the device is connected.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, IEEE.
(The Institute of Electrical and Electronics Engi
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device suitable for being applied to a device connectable to another device by a digital communication bus called neers) 1394 system, and a power supply control method applied to the electronic device.

[0002]

2. Description of the Related Art In recent years, video equipment and audio equipment such as video recorders, audio recorders, television receivers, tuners for receiving various broadcasts, audio amplifiers (hereinafter, these equipments are referred to as AV equipments or AV devices). ) Is connected to some kind of network, and video data and audio data are transmitted between the connected devices so that data can be transferred between the devices has been proposed and put into practical use.

For example, IEEE (The Institute of Ele)
ctrical and Electronics Engineers) A network via a 1394 serial data bus
A device that enables data transmission with V equipment has been developed. In this network, content data such as video data and audio data can be transmitted as stream data. In addition, a predetermined command (AV
It is also possible to remotely control AV equipment connected to the network by using / C Command Transaction Set: hereinafter referred to as AV / C command). Similarly, it is also possible to detect the state of AV equipment connected to the network by using the AV / C command.

[0004]

By the way, the IEEE1
In the 394 system, a device (bus manager or the like) that manages communication in the network recognizes a device connected to the network, and assigns an address on the bus to the recognized device. Each device connected to the bus line and given an address is also called a node. By recognizing a device and assigning an address, it becomes possible to send data to the device and detect the state of the device. Therefore, in such a network configuration, it is important to recognize the device connected to the bus line.

In the IEEE 1394 system, the connection of the devices can be recognized by detecting the bias voltage applied to one differential signal line TPA in the cable forming the bus line connecting the devices. . When there is a change in the device configuration in the network, that is, when a new device is connected to the network, or when one of the devices connected to the network is removed, a bus reset is performed. Occurring, the process of reassigning the device address in the network is executed.

When a bus reset occurs in this way, a device that manages communication within the network executes a device recognition process and an initialization process such as address setting of the recognized device. While this initialization process is being executed, there may occur a state in which data transmission in the network cannot be temporarily performed. For example, while transmitting video data reproduced by a VCR to a monitor receiver in the network in a network to which a plurality of AV devices are connected, one of those in the network When one device is disconnected from the network, a bus reset may occur and the transmission of video data to the monitor receiver may be temporarily interrupted.

Although such a data transmission interruption occurs in the worst case, even if such a situation does not occur, at the time of bus reset, each device in the network has a recognized device configuration. This will change the display of the connection configuration and the like, which may cause confusion for the user who operates the device.

By the way, as already mentioned, IEEE13
In the 94 system, the device is connected to the bus line by detecting the application of the bias voltage to one signal line of the cables forming the bus line.
Even if a device is connected to the bus line, it may be recognized that the device is not connected depending on the state of the device. That is, when the power of the device connected to the bus line is completely turned off, the bias voltage is not applied from the device, and even if the device is connected to the bus line, the device is not It will be recognized as not connected. Therefore,
Even in any one device in the network, a bus reset occurs every time the power is turned on / off.

In order to prevent the occurrence of a bus reset associated with the turning on / off of such a device, for example, even if the power switch of the device is operated to turn it off, communication is performed via the bus line. It is conceivable that only part of the power supply is always turned on. However, when the bus line communication circuit is always powered on in this way, the so-called standby power consumed by the equipment when the main power supply is turned off is only a few W in the bus line communication circuit. It will occur to some extent. Such an increase in standby power is not preferable from the viewpoint of reducing power consumption of the device.

Therefore, when the main power supply of the equipment is turned off, the power supply of the circuit for bus line communication may be turned off. In this case, among the devices connected by the bus line, only the device whose power is turned on is recognized as the device connected to the network. In this case, if the main power of the device is turned on or there is an operation to turn off the main power of the device, the network configuration will change and a bus reset will occur, but in general, the operation of the power button Since it is operated by the user, it is possible to avoid the inconvenience caused by the occurrence of the bus reset unless the user operates the power button.

However, some devices are turned on or off regardless of direct user operation. For example, in the case of a VCR or a television receiver, when the timer operation reaches the reserved time in advance, the device automatically shifts from the power-off state to the power-on state (or vice versa). There is. Also, in the case of a tuner that receives digital broadcasting, in order to receive specific data transmitted from the broadcasting station side, regardless of the user operation, when the power is off,
There is a case where a device stands up, temporarily receives a specific channel, and performs so-called standby reception for receiving specific data transmitted on the channel.

When these automatic power-on state transitions occur, the devices that have transitioned to the power-on state will join the network, and a bus reset will occur. Since such a bus reset due to the automatic power on / off occurs independently of the direct power operation by the user, it is possible to effectively avoid the inconvenience such as the temporary interruption of transmission due to the occurrence of the bus reset. Is difficult.

That is, in the case of standby reception of a tuner for receiving digital broadcasting (or a video device such as a television receiver in which such a tuner is incorporated), the device is apparently received with the power off. Even if the user looks at the front panel or the like of the device, he does not know that the device is operating at all, and the user cannot understand why the device has joined the network at all.

For example, as shown in FIG. 12, a tuner 1 for receiving a digital broadcast, a video deck 2 which is a video tape recording / reproducing device, and a monitor receiver 3 are IEEE.
Cables 8 and 9 that form a bus line for the 1394 system
Assume a network configured by connecting with. When the tuner 1 is turned off and the tuner 1 does not exist as a node on the network, when the tuner 1 starts standby reception for temporarily receiving data, the network It will exist as an upper node and the network configuration will change.

FIG. 13 is a diagram showing an example of changes in the state at this time. That is, when the tuner 1 is in the normal standby state with the main power supply turned off as shown in A of FIG. 13, the power supply of the portion that communicates via the bus line is turned off and the tuner 1 does not exist as a node on the network. It is in a state. In this state, as shown in FIG. 13B, for example, when a screen for input device selection is displayed on the monitor receiver 3, the other device (node) existing on the network is only the VCR 2. , VCR is displayed as a selection screen.

However, as shown in FIG. 13A, when the tuner 1 automatically starts standby reception, the power of the tuner 1 is turned on, a bus reset occurs, and the tuner 1 becomes a network. As a node on the upper side, as shown in FIG. 13B, the monitor receiver 3
The VCR and tuner will be displayed on the input device selection screen in.

When the tuner 1 completes the standby reception, the tuner 1 returns to the normal standby state, the power is turned off, a bus reset occurs, and A in FIG.
13, the tuner 1 does not exist as a node on the network again, and as shown in FIG. 13B, the input device selection screen of the monitor receiver 3 returns so that only the VCR is displayed. Here, since the standby reception itself is executed in a state that the user does not understand, it is completely unknown to the user why such a change in the input device selection screen occurs.

In view of the above points, the present invention efficiently manages the power supply of devices connected to this type of network,
The purpose is to suppress the occurrence of unnecessary bus reset.

[0019]

According to the present invention, in a device which can be connected to another device by a digital communication bus capable of communicating digital data, when the power of the device is turned on,
The part which processes the communication via the digital communication bus is intended to be kept inactive.

By doing so, even when the power of the device is turned on, the portion that processes communication via the digital communication bus remains inactive, and the device is connected by the digital communication bus. It does not exist on the network and no bus reset occurs.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described with reference to FIGS.

FIG. 1 is a diagram showing an example of a connection configuration between the equipment of this example and a network. In this example, the television receiver 100 is used as a device that constitutes the network.
A hard disk recording device 200, a video tape deck 300, and a video camera 400 are prepared, and these are connected in order by cables 11, 12, and 13 that form an IEEE 1394 bus line.

FIG. 2 is a block diagram showing a configuration example of the television receiver 100. The television receiver 100 of this example is a device called a digital television receiver that receives a digital broadcast signal and displays the received signal.

The television receiver 100 includes a tuner 101 for receiving digital television broadcast,
The tuner 101 supplies digital broadcast data obtained by receiving a predetermined channel to the receiving circuit unit 102,
Decode. The broadcast data decoded by the receiving circuit unit 102 is supplied to the demultiplexing unit 103 to be separated into video data and audio data. The separated image data is supplied to the image generation unit 104, image receiving processing is performed, and the CRT drive circuit unit 105 causes the cathode ray tube (C
RT) 106 is driven to display an image. Also, the audio data separated by the demultiplexing unit 103 is supplied to the audio signal reproducing unit 107, audio processing such as analog conversion and amplification is performed, and the processed audio signal is supplied to the speaker 108 and output.

Further, the television receiver 100 is an IE
A bus communication unit 109 for communicating with an EE1394 bus line is provided so that communication can be performed via a bus line cable connected to a cable connection port unit 120 of the receiver 100. That is, IEEE13
The video data and the audio data obtained from the bus system of the 94 system to the bus communication unit 109 are supplied to the demultiplexing unit 103 so that the video can be displayed on the CRT 106 and the audio can be output from the speaker 108. . Further, the video data and the audio data received by the tuner 101 are supplied from the demultiplexing unit 103 to the bus communication unit 109, and the IE
It can be sent to the bus side of the EE1394 system.

When two or more bus line cables can be connected to the port section 120, the bus communication section 109 executes a relay process between the plurality of cables. That is, the data received at any one port section is repeated on the cable connected to the other port section so that the data signal is propagated to the entire bus line in the network. This relay process is a process performed only when the bus communication unit 109 is in the operating state, and the relay process is not executed when the bus communication unit 109 is in the non-operating state.

When a cable forming an IEEE 1394 bus line is connected to the cable connection port section 120 of the receiver 100, the port section 12
At 0, a predetermined bias voltage is applied to one signal line TPA of the two sets of differential signal lines TPA and TPB in the cable. Further, the other signal line TPB detects the bias voltage and determines whether or not the other device is connected by the cable. The presence or absence of this connection is determined by the CPU 110 described later.
The bias voltage applied to the signal line TPA is supplied from the power supply circuit 115 described later, and depending on the state of the device, the bias voltage may not be applied even when the device is operating. The setting of the state in which the bias voltage is not applied will be described later.

The display processing in the television receiver 100 and the transmission processing via the bus communication unit 109 are executed under the control of the central control unit (CPU) 110. The CPU 110 has a memory 111, which is a ROM storing programs necessary for control, and a work RAM.
Is connected to the memory 112. Further, the operation information from the operation panel 113 and the control information from the remote control device received by the infrared light receiving unit 114 are stored in the CPU.
It is supplied to 110 to perform operation control corresponding to the operation information and control information.

When the bus communication unit 109 receives control data or the like via the IEEE 1394 bus, the data is supplied to the CPU 110, and the CPU 11
The control processing corresponding to 0 can be performed.

Further, the tuner 101 provided in the television receiver 100 of the present example is a tuner for digital broadcasting, and the tuner 101 has various types in addition to video data and audio data which are data of a main broadcast program. It also receives data. Data other than video and audio received by the tuner 101 is supplied to the CPU 110 and accumulated in the memory 112 or the like.

Examples of the data other than the video and audio include, for example, data for performing various displays associated with a program, so-called data broadcasting data, program guide data called electronic program information, reception contract, There are various data such as data related to viewing permission.

These data are, for example, data for performing various displays accompanying a program, and electronic program information data, which are basically received during the reception of a broadcast program. Some types receive the television broadcast when it is not being received. For example,
In the standby state where the image display of the television receiver is turned off at night, etc., the CPU 110 controls
The tuner 101 automatically receives a predetermined channel, and the data obtained at that time is stored in the memory 112 or the like. Such reception is called standby reception. During this standby reception, even during reception, the pilot lamp arranged on the front surface of the receiver 100 or the like remains in the standby state, and the standby reception is performed in a state invisible to the user.

Also, the television receiver 100 of the present example.
Is equipped with a timer function, and under the control of the CPU 110, the tuner 101 automatically starts reception at a reserved time, starts image reception on the CRT 106, and automatically receives and receives at a reserved time. It is possible to stop. The state in which the timer function is reserved and waiting is the standby state or the power-on state.

Then, the television receiver 100 of the present example.
The power supply circuit 115 included in the power supply circuit 115 is configured to supply power to each circuit in the receiver 100 under the control of the CPU 110. In this case, the bus communication unit 109 and the port unit 12, which are the units that perform communication via the IEEE 1394 bus.
Regarding 0, the power supply can be controlled separately from other blocks, and the operating state and the non-operating state can be set individually. Although details of the specific power control processing will be described later, when the television receiver 100 is in the standby state, the bus communication unit 109 and the port unit 120 are set to be in the power-off state, or vice versa. The bus communication unit 109 and the port unit 120 can be set to be always on even in the standby state. In order to perform such control, the CPU 110 operates by being supplied with power from the power supply circuit 115 even when the receiver is in the standby state.

The power supply to the port section 120 is performed in order to apply a bias voltage to the cable connected to the port section 120.

Next, a state in which communication is performed in the network having the configuration shown in FIG. 1 will be described. As described above, in this example, a plurality of devices are connected by the IEEE 1394 bus line to form a network, and the configuration in which data is transmitted by the IEEE 1394 bus line will be described below.

FIG. 3 is a diagram showing a cycle structure of data transmission between devices connected by the IEEE 1394 system. In the IEEE 1394 system, data is divided into packets and transmitted in time division with a cycle having a length of 125 μS as a reference. This cycle is created by a cycle start signal supplied from a node (any device connected to the bus) having a cycle master function.

The isochronous packet secures a band (in units of time, called a band) necessary for transmission from the beginning of every cycle. Therefore, in isochronous transmission, data transmission is guaranteed within a fixed time. However, confirmation from the receiving side (acknowledgement: ack)
If a transmission error occurs, data will be lost if there is no protection mechanism. As a result of arbitration, the node that secures the bus sends asynchronous packets during the time when it is not used for isochronous transmission in each cycle. In asynchronous transmission, acknowledge and retry are used to ensure reliable transmission. , The transmission timing is not constant.

In order for a given node to perform isochronous transmission, that node must support the isochronous function. Moreover, at least one of the nodes corresponding to the isochronous function must have the cycle master function. Further, at least one of the nodes connected to the IEEE 1394 serial bus is
It must have the function of an isochronous resource manager.

The IEEE1394 system is ISO / IEC
It conforms to the CSR (Control & Status Register) architecture having a 64-bit address space defined by 13213. FIG. 4 is a diagram for explaining the structure of the address space of the CSR architecture. The upper 16 bits are a node ID indicating a node on each IEEE 1394, and the remaining 48 bits are used for designating an address space given to each node. The upper 16 bits are further divided into 10 bits of bus ID and 6 bits of physical ID (node ID in a narrow sense). A value in which all the bits are 1 is used for a special purpose, and 1023 buses and 63 nodes can be designated. The node ID is reassigned when the bus is reset. The bus reset occurs when the configuration of the device connected to the bus 1 changes. For example, when any one of the devices connected to the bus 1 is removed or it is recognized that a device is newly connected to the bus 1, the bus reset is executed.

Of the address space defined by the lower 48 bits, the space defined by the upper 20 bits is 204
An initialization register space (Initial Register Space), a private space (Private Space), and an initialization memory space (In) used for 8-byte CSR-specific registers and IEEE 1394-specific registers.
The space defined by the lower 28 bits is divided into an itial memory space), and the space defined by the upper 20 bits is an initialization register space, a configuration ROM (Configuration read only memor)
y), an initialization unit space used for a node-specific application, a plug control register (PCRs), and the like.

Here, the plug control register will be explained. In the IEEE 1394 system, each node is a PCR (Plug Control Register) which is a register used as a plug in order to control data input / output.
) Has. This is a materialization of the concept of a plug using a register in order to form a signal path that is logically similar to an analog interface.
PCR is an oPCR (output plug code) that represents an output plug.
ntrol Register), iPCR that represents the input plug (input
Plug Control Register). In addition, PCR is
It has a register oMPR (output master plug register) and an iMPR (input master plug register) indicating information of an output plug or an input plug unique to each device. Each device does not have multiple oMPRs and iMPRs, but the oPCR and iMPR corresponding to individual plugs
It is possible to have a plurality of PCRs depending on the capabilities of the device. The flow of isochronous data is controlled by manipulating the registers corresponding to these plugs.

FIG. 5 is a diagram showing an example of transmission using a plug. Here, a device (node) connected to an IEEE 1394 bus is used as an AV device (AV-device).
Shown as a, b, c. OMP of AV device a
OPCR in which the transmission rate and the number of oPCRs are defined by R

Among [0] to oPCR [2], the isochronous data whose channel is designated by oPCR [1] is AV
The data is transmitted from the oPCR [1] of the device c to the channel # 1 of the IEEE1394 serial bus. The AV device a is a channel # of the IEEE 1394 serial bus.
The isochronous data sent to 1 is read. Similarly, AV device b uses oPCR

The isochronous data is transmitted to the channel # 2 designated by [0], and the AV
The device a reads the isochronous data from channel # 2 designated by iPCR [1].

In this way, data transmission is performed between the devices connected by the IEEE1394 serial bus. In this case, for example, when controlling a device connected via the IEEE 1394 serial bus, an AV / C command, which is a rule for transmitting control data via this bus line, is used. This AV
By using the / C command, other devices on the bus can control the devices connected to the bus line and determine the status.

Next, a power supply control process in a device connected to an IEEE 1394 bus line in which data transmission is performed with such a configuration will be described. Here, the power supply control process in the television receiver 100 shown in FIGS. 1 and 2 will be described.

In the television receiver 100 of this example, two modes, a bus communication on mode and a bus communication off mode, can be set by a user operation as a power control mode when the receiver is in a standby state. That is, as shown in the flowchart of FIG. 6, at the time of mode setting, in step S11, it is inquired whether or not to set a mode related to bus communication. When the bus communication off mode which is a low power consumption mode is set, As S12, when the receiver is in the standby state, the bus communication unit 10
9 is deactivated. When the bus communication unit 109 is inactive, the bias voltage is not applied to the cable connected to the port unit 120. When the bus communication off mode is not set, the bus communication on mode is set, and in step S13, when the power supply is in the standby state, the bus communication unit 109 is kept in the operating state, and the cable connected to the port unit 120 is connected. A bias voltage is also applied.

The standby state of the receiver here means that an image is displayed on the CRT of the receiver by a predetermined key operation (or a key operation of the remote control device) on the operation panel 113 of the television receiver 100. This is the case when the state is not performed. Apart from this standby state, the receiver can be completely powered off by operating the main power switch of the receiver. In this standby state, power is supplied from the power supply circuit 115 to only a minimum amount of circuits such as the CPU 110, and when the bus communication ON mode is set in the mode setting described above, the standby state is set. Bus communication unit 1
Also for 09, the power is supplied from the power supply circuit 115 and is operating. From this standby state, when there is an operation to turn on the power by key operation etc.,
The power is turned on, and the receiver 10 is controlled by the CPU 110.
Each circuit within 0 is activated.

The bus communication mode setting process shown in the flowchart of FIG. 6 is performed by, for example, the CRT 10 which is a video display unit.
A screen for selecting the mode is displayed on the screen of No. 6, and one of the modes is set by the user's key operation. FIG. 7 is a diagram showing a display example of this mode setting screen,
Here, there is a screen for inquiring whether to wait for bus communication during power standby or not to wait for bus communication.When you select standby for bus communication during standby, it becomes a normal mode that can be executed even when the bus communication is off. When the bus communication standby mode is selected when the power is turned off, the bus communication is in the inexecutable mode when the bus communication is off. The mode setting screen shown in FIG. 7 is displayed by, for example, displaying the menu screen and then selecting the mode setting in the menu screen.

Next, a processing example under the control of the CPU 110 when the power of the television receiver 100 is operated after the mode setting is performed in this way will be described with reference to the flowchart of FIG. First, it is determined whether or not there is an operation to put the receiver in the standby state while the power of the receiver is on (step S21). If it is determined in this determination that there is an operation to put the device in the standby state, it is determined whether or not the mode setting relating to bus communication is the bus communication off mode (step S22). When it is determined that the bus communication off mode is set, the bus communication unit 1
09 is set in the non-operating state, and the bias voltage is not applied in the port section (step S23).

When the process of step S23 is executed, and when it is determined in step S22 that the bus communication is on, the process proceeds to step S24 and the CP
Under the control of U110, a standby mode setting process for turning off the image display on the CRT 106 is performed (step S2).
4).

When it is determined that there is no standby operation in step S21, and after the standby mode is set in step S24, the CPU 110 determines whether or not there is an operation to turn on the power (step S25). Here, when the operation of turning on the power is not detected, the process returns to the determination of step S21. When the operation to turn on the power is detected, the CRT 1 is controlled by the CPU 110.
A power-on process for displaying an image is performed in 06 (step S26). During this power-on process, the bus communication unit 109
Then, the bus communication unit 109 is activated and a bias voltage is applied at the port unit.

Next, a standby reception process, which is a process for temporarily receiving data or the like at night in the standby state, will be described with reference to the flowchart of FIG.
This standby reception is executed when it is in the standby state and it is necessary to receive some data using the tuner 101 or the like, and the CPU 110 determines whether or not to start the standby reception (step S31), when it is determined to start the standby reception, it is determined whether or not the bus communication mode at that time is the off mode (step S32). When it is the bus communication off mode, the bus communication unit is stopped, With no bias voltage applied from the port section, the tuner or the like is operated to perform standby reception (step S33). If the bus communication OFF mode is not set in step S32, that is, if the bus communication ON mode is set, the bus communication unit is activated and a bias voltage is applied from the port unit to activate the tuner or the like for standby reception. Perform (step S34).

Then, step S33 or step S3
After the standby reception in 4 is started, it is judged whether or not the standby reception is ended (step S35), and when the standby reception is ended, the standby state is returned to (step S3).
6) and returns to the determination of step S31. When the standby state is set in step S36, the power supply of the bus communication unit is controlled according to the bus communication mode at that time.

Here, the example of the power supply control state in the television receiver of this example is summarized in a table as shown in FIG. Here, applying a bias voltage to the cable,
The state of the bus communication unit is distinguished from the state of the bus communication unit for each power state. That is, whether or not the bias voltage is applied at the port unit 120 is shown as ON (with application) or OFF (without application), and the state of the bus communication unit is shown as YES when output to the bus line is possible. , When output is not possible, it is indicated by X mark.

As shown in FIG. 10, in the case of this example, when the power supply of the receiver is completely off, no bias voltage is applied to the cable and communication is not performed in the bus communication section. Then, the power of the receiver is turned on, and the CRT 10
When the image is displayed on 6, the bias voltage is applied to the cable, and the communication by the bus communication unit is also possible.

In the case of the standby state, there are three possible states, that is, the normal standby state, the case where the tuner function is activated to turn on the tuner, and the case where standby reception is performed. In the normal standby state, the bias voltage is applied when the bus communication on mode is set, and the bias voltage is not applied when the bus communication off mode is set. Note that, in the example of FIG. 10, even when a bias voltage is applied, in a normal standby state, output of data and the like from the receiver to the bus is disabled.

In the standby state, as a normal process such as execution of timer reservation, when the tuner is turned on, a bias voltage is applied regardless of the bus communication mode, and communication in the bus communication unit is also possible. When the tuner is turned on in this normal processing, for example, the pilot lamp of the receiver becomes a state indicating that the tuner is on, and the user can see that the tuner is operating. Has become.

In the standby state, during standby reception, the normal standby state is maintained. That is, the bias voltage is applied when the bus communication on mode is set, and the bias voltage is not applied when the bus communication off mode is set. In addition, output of data from the receiver to the bus is not performed even in the mode during standby reception.

By thus setting the operating state of the bus communication unit in the standby state, it is possible to turn off the power of the bus communication unit in the standby state to bring it into a non-operating state. The standby power of the machine can be reduced. Even during standby, IEEE13
If you want to function as a node on a network connected by a 94-system bus line, you can set the bus communication on mode to activate the bus communication unit even in the standby state, The transition to the standby state does not cause a bus reset on the network.

Then, the bus communication off mode is set,
When the bus communication unit is turned off in the standby state, this receiver is not recognized on the network even if standby reception is performed to automatically receive the signal temporarily. A bus reset does not occur during execution of standby reception, and the network configuration is not disturbed. Therefore, for example, when the network configuration shown in FIG. 1 is set, the television receiver 100 is set to the standby state by setting the bus communication off mode,
Even if the television receiver 100 starts standby reception while the video camera 400 is transmitting video data and the like to the hard disk recording device 200 via the bus lines 13 and 12, the video camera 400 records the video data to the hard disk recording device 200. There is no interruption in data transmission to the device 200, and it is possible to effectively prevent adverse effects on other devices in the network.

In the example shown in FIG. 10, the application of the bias voltage and the possibility of outputting the data to the bus line are distinguished from each other. However, as described with reference to the flowcharts of FIGS. 8 and 9, It is also possible to completely link the operation and non-operation of the bus communication unit with and without applying the bias voltage. By distinguishing between the operation of the bus communication unit and the application of the bias voltage, it is possible to control the state in a finer manner.

Further, the bus communication unit may be always operated in the standby state, and only ON / OFF control of bias voltage application may be executed as shown in FIG. In this way, even if only the bias voltage is controlled,
The effect of preventing the occurrence of bus reset is exactly the same as in the above-mentioned example. By doing so, as the control by the CPU 110 of the receiver, only the bias voltage needs to be controlled, and the control configuration is simplified.

In the above-described embodiment, when the timer reservation is made in the television receiver 100 and the tuner or the like operates with the timer reservation, the bus communication section is operated regardless of the setting of the bus communication mode. However, even when the timer reservation is executed, the operation or non-operation of the bus communication unit may be selectively set according to the setting of the bus communication mode, as in the above-described standby reception. good. That is, for example, as shown in the flowchart of FIG. 11, when the CPU 110 determines that the reserved timer operation has started in the standby state (step S4).
1) It is determined whether or not the bus communication mode at that time is the off mode (step S42). When the bus communication mode is off, the bus communication unit is stopped and the bias voltage is applied from the port unit. The tuner is operated in the absence state (step S43). If the bus communication off mode is not set in step S42, that is, if the bus communication on mode is set, the bus communication part is set in the operating state, the bias voltage is applied from the port part, and the tuner is operated (step S44). . Then, after the reservation operation is executed by the tuner operation in step S43 or step S44, it is determined whether or not the reserved time ends (step S45). When the reserved time ends, the standby state is restored. (Step S46), the process returns to the determination of step S41. When the standby state is set in step S46, the power supply of the bus communication unit is controlled according to the bus communication mode at that time.

As shown in the flow chart of FIG. 11, the bus communication may be turned off when the timer is reserved when the reserved operation is executed from the standby state, and when the power is turned on. When the reserved operation is started, it is preferable to directly operate the bus communication unit operating in the power-on state without performing the determination process as shown in the flowchart of FIG.

In the embodiment described so far,
Although the network based on the IEEE 1394 standard bus is used, other networks may be used. In this case, each network includes Bluetooth (Bluetooth) in addition to networks using wired transmission lines.
: A wireless network such as a trademark may be used.

Further, as an example of a video device such as a television receiver or a video deck as a device connected by a network, and an example applied to power supply processing in a television receiver has been described, other video devices. It can be applied not only to the power supply processing in the above, but also to the case where a network is formed by audio equipment handling audio signals.
Further, it is also applicable to a case where a network of this kind is formed by various other electronic devices that can be connected to a digital communication bus line, other than video devices and audio devices.

[0067]

According to the present invention, even when the power of the device is turned on, the part that processes communication via the digital communication bus remains inactive, and the device is connected to the network via the digital communication bus. The above does not exist and the bus reset does not occur in the network to which the device is connected. Therefore, for example, even if the device is frequently turned on and off, the bus reset does not occur at all, and it is possible to effectively prevent an accident that interrupts the communication being executed in the network.

In this case, when there is a predetermined mode setting, the portion that processes communication via the digital communication bus is kept inactive, and when there is no predetermined mode setting, the power of the equipment is turned on. In some cases, the part that processes communication via the digital communication control bus is set to the operating state, so that the part is disabled only when communication via the digital communication bus is not required in mode setting by user operation. It is possible to keep it in the operating state, reduce the occurrence of bus reset when connected to the network, and when communication via the bus is not necessary,
It becomes possible to reduce the power consumption of the device.

In addition, in order to keep the portion processing the communication via the digital communication bus in the inactive state, the power is temporarily turned on in order to execute a function unrelated to the communication via the digital communication bus. In this case, it is possible to effectively prevent the occurrence of a bus reset, for example, in the case of standby reception of digital broadcasting.

In addition, it is when the power of the device is automatically turned on in order to execute the function reserved in advance that the part that processes the communication via the digital communication bus is kept in the inactive state. Thus, it becomes possible to effectively prevent the occurrence of a bus reset except when the user operates the power button or the like to turn on the power.

Further, the process of continuing the portion for processing communication via the digital communication bus to the inactive state is at least the process of not applying a predetermined bias voltage on this bus, and is based on the detection of the bias voltage. It is possible to easily prevent the occurrence of a bus reset in the case of a network for detecting device connection.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration example of a device (television receiver) according to one embodiment of the present invention.

FIG. 3 is a timing diagram showing a data transmission state on an IEEE 1394 bus line.

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

FIG. 5 is an explanatory diagram showing a plug setting example at the time of transmission on an IEEE 1394 bus line.

FIG. 6 is a flowchart showing an example of bus communication setting processing according to an embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an example of a mode setting screen according to an embodiment of the present invention.

FIG. 8 is a flowchart showing a processing example during standby according to the embodiment of the present invention.

FIG. 9 is a flowchart showing a processing example during standby reception according to an embodiment of the present invention.

FIG. 10 is an explanatory diagram showing an example of a power supply control state according to an embodiment of the present invention.

FIG. 11 is a flowchart showing an example of processing at the time of executing reservation according to another embodiment of the present invention.

FIG. 12 is a configuration diagram showing a network configuration example for explaining a conventional example.

FIG. 13 is an explanatory diagram showing a conventional state change example.

[Explanation of symbols]

11, 12, 13 ... IEEE 1394 type bus line cable, 100 ... Television receiver, 101 ... Tuner, 102 ... Receiving circuit section, 103 ... Demultiplexing section, 1
04 ... video generation unit, 105 ... CRT drive circuit unit, 106
... CRT (cathode ray tube), 107 ... Audio signal reproducing section, 10
8 ... Speaker, 109 ... Bus communication part, 110 ... Central control unit (CPU), 111 ... ROM, 112 ... RA
M, 113 ... Operation panel, 114 ... Infrared receiver, 11
5 ... Power supply circuit, 120 ... Port part, 200 ... Hard disk recording device, 300 ... Video tape deck, 400 ...
Video camera

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Claims (10)

[Claims] 1. A power supply control method for controlling the power supply of a device connectable to another device by a digital communication bus capable of communicating digital data, wherein the power supply of the device is turned on via the digital communication bus. The power supply control method that deactivates the part that processes communication. 2. The power supply control method according to claim 1, wherein when a predetermined mode is set, a portion which processes communication via the digital communication bus is kept inactive and the predetermined mode is set. If there is not, a power supply control method of turning on the power supply of the device to activate a portion for processing communication via the digital communication control bus. 3. The power supply control method according to claim 1, wherein the function of keeping the portion that processes communication via the digital communication bus in a non-operating state is a function unrelated to the communication via the digital communication bus. A power control method in which the power is temporarily turned on in order to execute. 4. The power control method according to claim 1, wherein the portion that processes communication via the digital communication bus is kept inactive for automatically executing a function reserved in advance. Power control method when the power of the device is turned on. 5. The power supply control method according to claim 1, wherein the process of keeping the portion processing communication via the digital communication bus in the inactive state is a process of not applying at least a predetermined bias voltage to the bus. Power control method. 6. A communication means for communicating with another device via a digital communication bus, and the operation of each part in the device including the communication means are controlled to turn on the power of the device in a predetermined operation state. , An electronic device comprising a control means for maintaining the communication means in a non-operating state. 7. The electronic device according to claim 6, wherein the predetermined operation state is when a predetermined mode is set, and when the predetermined mode is not set, the communication is performed by turning on the power of the device. An electronic device that activates the means. 8. The electronic device according to claim 6, wherein the predetermined operating state is a case where the device is temporarily powered on to execute a function unrelated to communication via the digital communication bus. An electronic device. 9. The electronic device according to claim 6, wherein the predetermined operation state is a case where the control means automatically turns on the power of the device to execute a function reserved in advance. . 10. The electronic device according to claim 6, wherein the control unit maintains the communication unit in a non-operating state by not applying a predetermined bias voltage to at least a bus connected to the communication unit. The electronic device that is the process.