JP4356784B2 - Digital broadcast receiving apparatus and method - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus that receives a digital broadcast signal, and more particularly to a digital broadcast receiving apparatus that supplies power by switching between a commercial power source and a battery.

  Digital terrestrial broadcasting in Japan, Europe, etc. employs Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM), which is resistant to multipath interference, and can receive SFN (Single Frequency Network). Therefore, it is possible to effectively use the frequency, but it is difficult to realize SFN in all regions, and it is not possible to make the same program the same frequency nationwide. Terrestrial broadcasts place importance on locality, and local broadcasters sometimes carry out their own broadcasts or insert commercials with locality. In this case, SFN is not possible.

  In particular, Japanese terrestrial digital broadcasting has time interleaving, so it is a strong system not only for fixed reception but also for mobile reception. In the case of a receiver that is small and portable (hereinafter referred to as a portable receiver) that supports mobile reception, or a receiver that is mounted on a mobile body (hereinafter referred to as a mobile receiver) It is difficult to select a receivable program because the reception state is unstable during movement or the like.

  Japanese terrestrial digital broadcasting is being considered as ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) in consideration of the commonality between television broadcasting and audio broadcasting. The broadcasting system for terrestrial digital television broadcasting was May 1999. The broadcasting system for terrestrial digital audio broadcasting was reported in November 1999. The ISDB-T television broadcasting system is described in detail in NHK R & D, No. 56, May 1999 of Non-Patent Document 1.

  In digital terrestrial broadcasting, SI information (Service Information: program arrangement information) such as PSI (Program Specific Information), EPG (Electronic Program Guide), etc. Unlike so-called all-station SI that transmits all TS (Transport Stream) simultaneously, so-called each-station SI that uses its own information in its own TS, encodes and modulates the TS, and transmits on each channel is used. It is believed that

  On the other hand, the most commonly considered mobile receiver is an in-vehicle receiver. As an in-vehicle receiver, it is considered that system control is performed by connecting a bus with IEEE1394 as disclosed in Japanese Patent Application Laid-Open No. 11-304500 of Patent Document 1 and Japanese Patent Application Laid-Open No. 11-175457 of Patent Document 2.

NHK STRL R & D, No56, May 1999 Japanese Patent Laid-Open No. 11-304500 JP-A-11-175457

  In digital terrestrial broadcasting, each station SI is likely to be used as described above, but the problem in this case is that the latest information on SI information other than the currently selected channel cannot be obtained. is there. SI information, particularly EPG, may change the program in the channel, but it is possible to update the changed EPG for the currently received channel. However, even if SI information is changed for a channel not currently received, it cannot be known. Therefore, when a channel other than the currently received channel is selected again, first, it is necessary to recognize whether there is a change in the SI information, and to update it if there is a change. This took time, and there was a problem that comfortable tuning was not made. In addition, when the update frequency of SI information is frequent, there is a problem that the burden is large in battery driving.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a digital broadcast receiving apparatus for receiving a digital broadcast signal by switching the operation power of the digital broadcast receiving apparatus between a commercial power supply and a battery and supplying the program arrangement of the digital broadcast signal according to the power supply state. An object of the present invention is to provide a digital broadcast receiving apparatus that updates additional information such as information.

The object can be achieved by the configuration described in the claims as an example.

According to the present invention, in a digital broadcast receiving apparatus that supplies operating power of a digital broadcast receiving apparatus that receives a digital broadcast signal by switching between a commercial power supply and a battery , the program arrangement of the digital broadcast signal according to the power supply state A digital broadcast receiving apparatus that updates additional information such as information can be obtained.

  Embodiments of a digital broadcast signal receiving apparatus for receiving a digital broadcast signal according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the first embodiment of the digital broadcast signal receiving apparatus of the present invention. Here, an in-vehicle receiver is assumed.

  101 is a broadcast signal input terminal, 102 is a channel selection unit, 103 is a digital demodulation unit, 104 is a demultiplexing unit, 105 is an audio decoding unit, 106 is an audio output terminal, 107 is a video decoding unit, 108 is a presentation processing unit, 109 Is a video output terminal, 110 is a control unit, 111 is a PSI / SI storage unit, 112 is a data storage unit, 113 is a receiver selection unit, 114 is a digital broadcast receiver, and 115 is a power supply state determination unit.

  The received broadcast signal is input to the input terminal 101. This input signal includes an analog broadcast signal and a digital broadcast signal.

  The channel selection unit 102 selects one reception channel from the broadcast signal received from the input terminal 101 in accordance with a control signal from the control unit 110, converts it to an intermediate frequency, and outputs it as an intermediate frequency reception channel signal. Here, it is assumed that a digital broadcast signal is received. The digital demodulator 103 digitally demodulates the gain-controlled intermediate frequency reception channel signal and outputs a TS signal.

  The demultiplexing unit 104 extracts audio data or video data requested by the control unit 110 and outputs the audio data or video data to the audio decoding unit 105 and the video decoding unit 107, respectively. In addition, information data sent by data broadcasting is processed by the control unit 110 and output to the presentation processing unit 108.

  The audio decoding unit 105 decodes the audio data and outputs it to the output terminal 106 as an audio signal. The video decoding unit 107 decodes the video data and outputs it to the presentation processing unit 108 as a video signal. The presentation processing unit 108 multiplexes the video signal and the processed information data and outputs the multiplexed information to the output terminal 109.

  The digital broadcast signal selected by the channel selection unit 102 includes PSI / SI information such as EPG which is one of additional information. The PSI / SI information is extracted by the demultiplexing unit 104 and stored in the PSI / SI storage unit 111.

  In addition, the digital broadcast signal selected by the channel selection unit 102 includes data broadcasting such as stock and weather forecast, which is another additional information. The data broadcast information is extracted by the demultiplexing unit 104 and stored in the data storage unit 112.

  The receiver selection unit 113 outputs a reproduction request signal indicating whether the receiver of the digital broadcast receiving apparatus 114 has selected whether or not to use the digital broadcast receiving apparatus 114. Generally, it is indicated by a user pressing a selection switch of a digital broadcast receiver or selecting with a remote controller.

  The power supply state determination unit 115 determines whether the power used in the digital broadcast receiver 114 is power from a generator that is a commercial power source, power from a battery, or when power supply is cut or restricted. A power supply status signal is output. This will be described with reference to FIG.

  FIG. 2 is a schematic diagram showing a general engine switch of an automobile. 201 is a rotating plate having a key insertion slot, 202 is a key position display fixing plate, and has a LOCK position, an ACC position, an ON position, and a START position. Can be set to position.

  LOCK indicates “lock”, and is when the power supply to the digital broadcast receiving apparatus 113 is cut off or restricted. ACC indicates “accessory”, and is a case where power is supplied to the digital broadcast receiving apparatus 114 from a battery.

  ON indicates “ON”, and is when the engine is rotating and the generator is driven to supply power to the digital broadcast receiver 114 from the generator. START indicates “start” and is the position where the engine is started. After starting, the engine is returned to the ON position.

  Therefore, the power supply state by the power supply state determination unit 115 can be determined by the position of the engine switch. However, since it is possible that the engine does not start at START and is in the ON position, it is more reliable to detect supply from the generator by detecting the rotation of the engine or generator.

  Further, it may be possible to obtain the power supply status signal from the voltage value or voltage waveform of electricity supplied to the digital broadcast receiver 114.

  Next, the operation of the control unit 110 will be described with reference to FIG. FIG. 3 is a flowchart showing the processing steps of the control unit 110, 301 is START, 302 is a determination step of power supply status, 303, 304, and 305 are selected to use the digital broadcast receiving device 114 from the receiver selection unit 113. Step 306 for determining a reproduction request signal indicating whether or not the power supply is selected. 306 is a process performed when the power supply is cut off or restricted and the digital broadcast receiver 114 is not selected. Processing b and 308 performed when the digital broadcast receiving apparatus 114 is selected to be used when it is disconnected or restricted, and when the power supply is power from the battery and the digital broadcast receiving apparatus 114 is not selected Steps c and 309 are performed when the power supply is power from the battery and the digital broadcast receiver 114 is selected to be used. Processes e and 311 performed when the digital broadcast receiving apparatus 114 is not selected and the power supplied from the power source is from the generator and when the digital broadcast receiving apparatus 114 is selected to be used. f.

  In the process a in step 306 and the process b in step 307, if the power supply is completely cut off, it is not possible to make a difference in the process to be performed, but the power is supplied in a state that is more limited than normal power. In the case of a so-called dormant state, it may be better to have a difference in processing. For example, in the case of the process a in step 306, there may be another AV device or navigation selected, and the sleep processing of the selected device is validated. In the process b of Step 307, since the digital broadcast receiving device 114 is selected, the sleep processing of the digital broadcast receiving device 114 is performed, for example, the automatic start-up is performed when there is an emergency information broadcast, or the emergency alert is notified. Can be considered.

  In the process d in step 309 and the process f in step 311, generally, the digital broadcast receiving apparatus 114 is started up and made available, the reception channel selected last time is selected, and an audio signal and a video signal are output from the output terminals 106 and 109, respectively. Although not shown in FIG. 1, it is reproduced on a speaker or a monitor. However, since the processing d in step 309 is the power supplied from the battery, it is started up in a so-called energy saving mode, for example, the function of reducing the video size, reducing the luminance of the video, or setting only the audio output without outputting the video. It is also conceivable to make the state restricted.

  In the process c in step 308 and the process e in step 310, since the digital broadcast receiving apparatus 114 is not selected, the digital broadcast receiving apparatus 114 is operated while it is not selected, and EPG which is one of the additional information of each channel. An operation for acquiring PSI / SI information such as is performed. Specifically, first, as a first step, the channel selection unit 102, the digital demodulation unit 103, and the demultiplexing unit 104 are controlled to investigate and update the update status of the PSI / SI information of the reception channel received up to the previous time. If so, the PSI / SI information is extracted and stored in the PSI / SI storage unit 111. Next, as a second stage, the channel selection unit 102 is controlled to search for other reception channels other than those previously received, and then the digital demodulation unit 103 and the demultiplexing unit 104 are controlled to select the reception channel selected this time. The update status of the PSI / SI information is checked, and if updated, the PSI / SI information is extracted and stored in the PSI / SI storage unit 111. This is performed in all frequency bands of digital broadcasting. In the process c of Step 308, the process is temporarily ended, and this process is repeated after a certain period of time. In the process e of step 310, this process is immediately repeated again. Note that it is conceivable that the process c in step 308 may or may not be performed only in the first stage.

  With the above processing, in the embodiment of digital broadcast reception shown in FIG. 1, the change of the PSI / SI information, which is one of the additional information, can be updated in accordance with the power supply state.

  On the other hand, since the digital broadcast receiving apparatus 114 is not selected in the process c of step 308 and the process e of step 310, the digital broadcast receiving apparatus 114 is operated while it is not selected, and another additional information of each channel is obtained. The operation of acquiring data broadcast information is performed. Specifically, first, as a first step, the channel selection unit 102, the digital demodulation unit 103, and the demultiplexing unit 104 are controlled, and the update status of the data broadcast information of the reception channel received until the previous time is investigated and updated. If so, the data broadcast information is extracted and stored in the data storage unit 112. Next, as a second stage, the channel selection unit 102 is controlled to search for other reception channels other than those previously received, and then the digital demodulation unit 103 and the demultiplexing unit 104 are controlled to select the reception channel selected this time. The update status of the data broadcast information is investigated, and if updated, the data broadcast information is extracted and stored in the data storage unit 112. This is performed in all frequency bands of digital broadcasting. In the process c of Step 308, the process is temporarily ended, and this process is repeated after a certain period of time. In the process e of step 310, this process is immediately repeated again. Note that it is conceivable that the process c in step 308 may or may not be performed only in the first stage.

  Through the above processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 1, it is possible to update data broadcast information which is another additional information in accordance with the power supply state.

  FIG. 4 is a block diagram showing a configuration of a second embodiment of a digital broadcast signal receiving apparatus for receiving a digital broadcast signal of the present invention. Again, an in-vehicle receiver is assumed. 1 denote the same functions, 401 is a data request storage unit, and 402 is a data request information input terminal.

  The digital broadcast signal selected by the channel selection unit 102 includes data broadcasts such as stocks and weather forecasts. Data request information indicating information required by the receiver in the data broadcast is input from the input terminal 402. This data request information is stored in the data request storage unit 401. The data broadcast information requested by the data request information is extracted by the demultiplexing unit 104 and stored in the data storage unit 112.

  The operation of FIG. 4 will be described using the processing steps of FIG. In the process c in step 308 and the process e in step 310, since the digital broadcast receiving apparatus 114 is not selected, the digital broadcast receiving apparatus 114 is operated while it is not selected, and the data request information that is additional information of each channel is used. An operation for obtaining the requested data broadcast information is performed. Specifically, first, as a first step, the channel selection unit 102, the digital demodulation unit 103, and the demultiplexing unit 104 are controlled, and the data requested by the data request information which is the additional information of the reception channel received until the previous time. The update status of the broadcast information is checked, and if updated, the data broadcast information requested by the data request information which is additional information is extracted and stored in the data storage unit 112. Next, as a second stage, the channel selection unit 102 is controlled to search for other reception channels other than those previously received, and then the digital demodulation unit 103 and the demultiplexing unit 104 are controlled to select the reception channel selected this time. The update status of the data broadcast information requested by the data request information which is the additional information is investigated, and if updated, the data broadcast information requested by the data request information which is the additional information is extracted and stored in the data storage unit 112. Remember. This is performed in all frequency bands of digital broadcasting. In the process c of Step 308, the process is temporarily ended, and this process is repeated after a certain period of time. In the process e of step 310, this process is immediately repeated again. Note that it is conceivable that the process c in step 308 may or may not be performed only in the first stage.

  With the above processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 4, the change of the data broadcast information requested by the data request information that is additional information can be updated in accordance with the power supply state.

  FIG. 5 is a block diagram showing a configuration of a third embodiment of a digital broadcast signal receiving apparatus for receiving a digital broadcast signal according to the present invention. Again, an in-vehicle receiver is assumed. 4 denote the same functions, and reference numeral 501 denotes an external data input terminal. The data request information input from the input terminal 402 in FIG. 5 includes not only information included in the data broadcast but also external data obtained by input to the input terminal 501 from a device other than the digital broadcast receiver 114. It is out.

  Next, the external data will be described with reference to FIG. FIG. 6 is a connection schematic diagram of equipment mounted on the automobile. 601 is a system control unit, 602 is a bus line, 603 is a digital broadcast receiving apparatus of the present invention, 604 is navigation, 605 is a monitor, 606 is a power supply state determination unit, 607 and 608 are AV devices, 609 and 610 are speed and It is a vehicle state information determination unit such as an engine speed.

  In FIG. 6, a digital broadcast receiver 603, a navigation 604, a monitor 605, a power supply state determination unit 606, AV devices 607 and 608, and vehicle state information determination units 609 and 610 are connected by a single bus 602, so-called in-vehicle LAN ( (Local Area Network) is constructed, and the system control unit 601 controls the whole. In such a system, external data can be easily extracted from devices other than the digital broadcast receiving apparatus 603. As an example, the position information from the navigation 604 is external data input from the input terminal 501 in FIG.

  It is assumed that data request information indicating information closely related to an area in the data broadcast is input from the input terminal 402. This data request information is stored in the data request storage unit 401. The data broadcast information requested by this data request information is extracted by the demultiplexing unit 104 controlled by the control unit 110 referring to the position data from the navigation obtained from the input terminal 501, and information closely related to the region is extracted. It is stored in the storage unit 112.

  Next, the operation of FIG. 5 will be described using the processing steps of FIG. In the process c of step 308 and the process e of step 310, since the digital broadcast receiving apparatus 114 is not selected, the digital broadcast receiving apparatus 114 is operated while the digital broadcast receiving apparatus 114 is not selected, and the data broadcast information and external data of each channel are obtained. Perform the action to get.

  Specifically, first, as a first step, the channel selection unit 102, the digital demodulation unit 103, and the demultiplexing unit 104 are controlled to update the data broadcast information of the reception channel received up to the previous time and the position information from the outside If the information closely related to the area is updated while referring to the position information, the data broadcast information is extracted and stored in the data storage unit 112.

  Next, as a second step, the channel selection unit 102 is controlled to search for other reception channels other than those previously received, and the position information from the outside is investigated, and then the digital demodulation unit 103 and the demultiplexing unit 104 are controlled. Then, check the update status of the information requested by the data request information, which is additional information closely related to the area of the receiving channel selected this time while referring to the location information, and if it is updated, the data closely related to the area Broadcast information is extracted and stored in the data storage unit 112.

  This is performed in all frequency bands of digital broadcasting. In the process c of Step 308, the process is temporarily ended, and this process is repeated after a certain period of time. In the process e of step 310, this process is immediately repeated again. Note that it is conceivable that the process c in step 308 may or may not be performed only in the first stage.

  With the above processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 5, it is possible to update the information closely related to the area according to the power supply state and the reception position of the digital broadcast.

  FIG. 7 is a block diagram showing a configuration of a fourth embodiment of a digital broadcast receiving apparatus for receiving a digital broadcast signal of the present invention. 5 denote the same functions, and reference numeral 701 denotes a bidirectional communication unit.

  The bidirectional communication unit 701 obtains information such as EPG from the outside, for example, the Internet web. As an example, the positional information from the navigation 604 in FIG. 6 is external data input from the input terminal 501 in FIG.

  Request and receive information closely related to a region or a selectable station in that region and the EPG of the station, etc., by a two-way communication unit 701 controlled by the control unit 110 referring to position data from navigation obtained from an input terminal 501 And stored in the data storage unit 112. Alternatively, PSI / SI information may be requested by bidirectional communication unit 701 and stored in PSI / SI storage unit 111.

  The operation of FIG. 7 will be described using the processing steps of FIG. Since the operation of FIG. 7 is performed separately from the broadcast reception, it does not matter whether the digital broadcast receiver is selected or not. In the process c in step 308 and the process d in step 309, and in the process e in step 310 and the process f in step 311, the update status of the information received by the bidirectional communication unit 701 until the previous time and the position information from the outside are displayed. Investigate and reference the location information, and if the information closely related to the area or the station selectable station in that area and the EPG of the station are updated, the bidirectional communication unit 701 requests and receives the information again to extract the information. And stored in the data storage unit 112. In the process c of step 308 and the process d of step 309, the process is temporarily ended, and this process is repeated after a certain time. This process is repeated again immediately in the process e of step 310 and the process f of step 311.

  With the above processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 7, the information closely adhered to the area according to the power supply state and the reception position of the digital broadcast, the selectable station in the area, the EPG of the station, etc. Can be updated.

  The bidirectional communication unit 701 is not only provided for FIG. 5 as shown in FIG. 7, but the same effect can be obtained when provided for FIG. 1 and FIG.

In the above description, the explanation was made on the assumption that the in-vehicle receiver was used. However, the power supply by a commercial power source such as a generator or the AC power source by a household AC outlet or the like and the power supply by a battery are switched. The present invention can be applied to a digital broadcast receiving apparatus of a type, for example, a portable digital broadcast receiving apparatus in which a digital broadcast receiving unit is built in a notebook computer or a built-in battery is loaded.
The first aspect of the present invention receives and selects a transmission signal including a digital broadcast signal, demodulates it, and outputs a reproduction signal such as a video signal, an audio signal, or a data signal. Power is supplied from a battery and a generator or a commercial power source. In the digital broadcast receiving apparatus that is switched and supplied in step 1, the channel selection unit that selects the reception channel of the digital broadcast signal selected from the transmission signal by the channel selection control signal, and the demodulation signal that demodulates the output signal of the channel selection unit A demodulator that outputs the program sequence information included in the demodulated signal, a demultiplexer that outputs the sequence information, a storage unit that stores the program sequence information, and a receiver of the digital broadcast receiver A reproduction determination unit that outputs a reproduction request signal indicating whether or not a request is made, and whether the power used in the digital broadcast receiver is from a generator or a commercial power source A power supply status determination unit that outputs a power supply status signal indicating whether the power from the battery or the power supply is cut off or restricted; and the channel selection unit that receives the regeneration request signal and the power supply status signal; And a control unit that controls the demodulating unit and the demultiplexing unit and stores the program arrangement information in the storage unit.
According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a bidirectional communication unit that is controlled by the control unit to perform bidirectional communication with the outside and obtain communication information from the outside. And
The third aspect of the present invention receives and selects a transmission signal including a digital broadcast signal, demodulates it, and outputs a reproduction signal such as a video signal, an audio signal, or a data signal. Power is supplied from a battery and a generator or a commercial power source. In the digital broadcast receiving apparatus that is switched and supplied in step 1, the channel selection unit that selects the reception channel of the digital broadcast signal selected from the transmission signal by the channel selection control signal, and the demodulation signal that demodulates the output signal of the channel selection unit A demodulator that outputs the program arrangement information and data information included in the demodulated signal, a demultiplexer that outputs the information, a storage unit that stores the program arrangement information, and a receiver of the digital broadcast receiver A reproduction determination unit that outputs a reproduction request signal indicating whether the reproduction signal is requested or not, and the power used in the digital broadcast receiver is a generator or a commercial power source A power supply status determination unit that outputs a power supply status signal indicating whether the power from the battery, the power from the battery, or the power supply is cut off or restricted, and the necessary information of the program arrangement information and data information A request storage unit for storing an information request signal for requesting, the reproduction request signal, the power supply status signal, and the information request signal from the request storage unit, and receiving the channel selection unit, the demodulation unit, and the demultiplexing And a control unit that stores the program arrangement information and data information requested by the information request signal in the storage unit.
The fourth aspect of the present invention receives and selects a transmission signal including a digital broadcast signal, demodulates it, and outputs a reproduction signal such as a video signal, an audio signal, or a data signal. Power is supplied from a battery and a generator or a commercial power source. In the digital broadcast receiving apparatus that is switched and supplied in step 1, the channel selection unit that selects the reception channel of the digital broadcast signal selected from the transmission signal by the channel selection control signal, and the demodulation signal that demodulates the output signal of the channel selection unit A demodulating unit for outputting, a demultiplexing unit for separating and outputting program arrangement information and data information included in the demodulated signal, and external information supplied from outside the program arrangement information or the digital broadcast receiving apparatus. A storage unit for storing, a playback determination unit for outputting a playback request signal indicating whether or not a receiver of the digital broadcast receiving apparatus requests the playback signal; Power supply that outputs a power supply status signal that indicates whether the power used by the Tal broadcast receiver is from a generator or commercial power supply, from a battery, or when power supply is cut or restricted A status determination unit, a request storage unit for storing an information request signal for requesting necessary information among the program arrangement information and data information, the reproduction request signal, the power supply status signal, and the sequence from the request storage unit Receives an information request signal, controls the channel selection unit, the demodulation unit, and the demultiplexing unit, and stores the program arrangement information, data information, or external information requested by the information request signal in the storage unit And a control unit.
According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, a bidirectional communication unit that is controlled by the control unit and that performs bidirectional communication with the outside and obtains communication information from the outside is provided. It is characterized by that.
According to the present invention, in a digital broadcast receiving apparatus that supplies operating power of a digital broadcast receiving apparatus that receives a digital broadcast signal by switching between a commercial power supply and a battery, the program arrangement of the digital broadcast signal according to the power supply state A digital broadcast receiving apparatus that updates additional information such as information can be obtained.

1 is a block diagram showing a configuration of a first embodiment of a digital broadcast signal receiving apparatus of the present invention. It is a schematic diagram which shows the general engine switch of a motor vehicle. 3 is a flowchart showing processing steps of a control unit 110. FIG. FIG. 5 is a block diagram showing a configuration of a second embodiment of a digital broadcast signal receiving apparatus for receiving a digital broadcast signal of the present invention. FIG. 6 is a block diagram showing a configuration of a third embodiment of a digital broadcast signal receiving apparatus for receiving a digital broadcast signal of the present invention. It is a connection schematic diagram of the apparatus mounted in a motor vehicle. FIG. 10 is a block diagram showing the configuration of a fourth embodiment of a digital broadcast receiving apparatus that receives a digital broadcast signal of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Broadcast signal input terminal, 102 ... Channel selection unit, 103 ... Digital demodulation unit, 104 ... Demultiplexing unit, 105 ... Audio decoding unit, 106 ... Audio output terminal, 107 ... Video decoding unit, 108 ... Presentation processing unit, 109 DESCRIPTION OF SYMBOLS ... Video | video output terminal, 110 ... Control part, 111 ... PSI / SI memory | storage part, 112 ... Data memory part, 113 ... Receiver selection part, 114 ... Digital broadcast receiver, 115 ... Power supply state judgment part, 302 ... Power supply State determination step, 303, 304, 305... Reproduction request signal determination step indicating whether or not the digital broadcast receiving device 114 from the receiver selection unit 112 is selected for use, 306. Processing to be performed when the digital broadcast receiving device 114 is disconnected or restricted and a, 307... Selected when the power supply is cut or restricted and the digital broadcast receiving device 114 is to be used. When the line Process b, 308... Process c performed when power is supplied from the battery and the digital broadcast receiver 114 is not selected. 309... Electric power is supplied from the battery and the digital broadcast receiver 114 is to be used. Process d performed when selected, 310... Process e performed when power supply is from the generator and the digital broadcast receiver 114 is not selected. 311... Power supply is power from the generator. Processing f, 401... Data request storage unit, 402... Data request information input terminal, 501... External data input terminal, 701.

Claims (10)

A digital broadcast receiving apparatus that receives and demodulates a transmission signal including a digital broadcast signal and outputs a reproduction signal,
Power supply status determination that outputs a power supply status signal indicating whether the digital broadcast receiver is in a state of receiving power supply from a battery or in a state of receiving power supply from at least one of a generator or a commercial power source And
The power supply status signals, if shows the state where the digital broadcast receiving apparatus is receiving power from at least one generator or utility power, the digital broadcast receiver as an ordinary use state, Check the update status of the received additional information, and if the update status has been updated, control the reception operation to receive the updated additional information to perform a predetermined number of times,
The power supply status signals, if shows the state where the digital broadcast receiving apparatus is receiving electric power supply from the battery is with less power-consuming than the digital broadcast receiving apparatus wherein a normal usable state A power-saving mode, and a control unit that performs control so that the reception operation is performed less than the predetermined number of times or not once ,
A digital broadcast receiver characterized by comprising:   The digital broadcast receiver according to claim 1,
  The power saving mode is at least one of reducing the video size compared to the normal usable state, reducing the luminance compared to the normal usable state, or outputting only the audio output without outputting the video output. A digital broadcast receiver characterized in that   A digital broadcast receiving apparatus that receives and demodulates a transmission signal including a digital broadcast signal and outputs a reproduction signal,
  A power supply status determination unit that outputs a power supply status signal indicating whether the digital broadcast receiving device is in a state where power supply is restricted or is in a state where power is supplied from at least one of a generator or a commercial power source. When,
  When the power supply status signal indicates that the digital broadcast receiving device is supplied with power from at least one of a generator or a commercial power supply, the digital broadcast receiving device is set in a normal usable state and received. Check the update status of the additional information, and if the update status has been updated, control the reception operation to receive the updated additional information to perform a predetermined number of times,
  When the power supply status signal indicates that the digital broadcast receiving apparatus is in a state where power supply is restricted, the digital broadcast receiving apparatus is put into a sleep state and the reception operation is performed less than the predetermined number of times. Or a control unit that performs control so as not to be performed once or
  A digital broadcast receiver characterized by comprising:   The digital broadcast receiver according to claim 3,
  The sleep state is at least one of a state in which the digital broadcast reception device is activated when an emergency information broadcast is received, or a state in which an emergency alarm notification process is performed.   The digital broadcast receiver according to any one of claims 1 to 4,
  The digital broadcast receiver according to claim 1, wherein the additional information is at least one of program specifying information, program arrangement information, data broadcast information, or information closely related to a region.   A control method in a digital broadcast receiving apparatus that receives and demodulates a transmission signal including a digital broadcast signal and outputs a reproduction signal,
  The digital broadcast receiving apparatus outputs a power supply status signal indicating whether the power is supplied from a battery or a power supply from at least one of a generator or a commercial power supply,
  When the power supply status signal indicates that the digital broadcast receiving device is supplied with power from at least one of a generator or a commercial power supply, the digital broadcast receiving device is set in a normal usable state and received. The update status of the additional information is checked, and if the update status is updated, a reception operation for receiving the updated additional information is performed a predetermined number of times,
  When the power supply status signal indicates that the digital broadcast receiving device is supplied with power from a battery, the digital broadcast receiving device is in a state that consumes less power than the normal usable state. A power mode, the reception operation is performed less than the predetermined number of times, or not performed once,
  A control method in a digital broadcast receiving apparatus.   A control method in the digital broadcast receiving apparatus according to claim 6,
  The power saving mode is at least one of reducing the video size compared to the normal usable state, reducing the luminance compared to the normal usable state, or outputting only the audio output without outputting the video output. A control method in a digital broadcast receiving apparatus, wherein   A control method in a digital broadcast receiving apparatus that receives and demodulates a transmission signal including a digital broadcast signal and outputs a reproduction signal,
  The digital broadcast receiving device outputs a power supply status signal indicating whether power supply is restricted or a state where power is supplied from at least one of a generator or a commercial power supply,
  When the power supply status signal indicates that the digital broadcast receiving device is supplied with power from at least one of a generator or a commercial power supply, the digital broadcast receiving device is set in a normal usable state and received. The update status of the additional information is checked, and if the update status is updated, a reception operation for receiving the updated additional information is performed a predetermined number of times,
  When the power supply status signal indicates that the digital broadcast receiving device is restricted in power supply and the playback request signal requests the playback signal, the digital broadcast receiving device is put to sleep. State, and the receiving operation is performed less than the predetermined number of times or not performed once,
  A control method in a digital broadcast receiving apparatus.   A control method in the digital broadcast receiving apparatus according to claim 8,
  The sleep state is at least one of a state in which the digital broadcast receiving device is activated when an emergency information broadcast is performed, or a state in which processing for passing an emergency alert is performed, and the control in the digital broadcast receiving device Method.   A control method for a digital broadcast receiver according to any one of claims 6 to 9,
  The control method in a digital broadcast receiving apparatus, wherein the additional information is at least one of program specifying information, program arrangement information, data broadcast information, or information closely related to a region.

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