JP2002359791A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To update information attached to the digital broadcast signal such as program guide information in matching with the power supply state in a digital broadcast receiver that receives a digital broadcast signal, and obtains operating power from a commercial power supply or a battery through switching. SOLUTION: A power supply state decision section 115 outputs a power supply state signal denoting whether power used by the digital broadcast receiver 114 comes from a commercial power supply or from a battery. When a receiver selection section 113 outputs a request signal denoting that a recipient of the digital broadcast receiver does not select the receiver, the attached information such as program guide information is updated in matching with the power supply state depending on the power supply state signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiving apparatus for receiving a digital broadcast signal, and more particularly to a digital broadcast receiving apparatus for supplying power by switching between a commercial power supply and a battery.

[0002]

2. Description of the Related Art In terrestrial digital broadcasting in Japan and Europe, for example, orthogonal frequency division multiplexing (Orthogonal Fr.
It adopts the equency division multiplexing (hereinafter, OFDM) system, which can use SFN (Single Frequency Network) reception and can use the frequency effectively, but realizes SFN in all regions It is difficult to do so, and it is not possible to make the same program nationwide the same frequency. In addition, terrestrial broadcasting places importance on regional characteristics, and local stations may perform their own broadcasting or include commercials with local characteristics. In this case, SFN is not possible. In particular, digital terrestrial broadcasting in Japan has a time interleave, so that it is a system that is strong not only for fixed reception but also for mobile reception. In the case of a small and portable receiver (hereinafter referred to as a portable receiver) or a receiver used on a mobile object (hereinafter referred to as a mobile receiver) that supports mobile reception, It is difficult to select a receivable program because it is often unclear whether the user is in the office or because the reception state is unstable while moving. Digital terrestrial broadcasting in Japan is based on ISDB-T (Integrated Servic
es Digital Broadcasting for Terrestrial). The broadcasting system for digital terrestrial television broadcasting was reported in May 1999, and the broadcasting system for digital terrestrial audio broadcasting was reported in November 1999. Regarding the ISDB-T television broadcasting system, please refer to NHK Giken R & D, No.
56, May 1999.

In digital terrestrial broadcasting, PSI (Program Sp
ecific Information: program specific information), EPG (Electro
SI information (Service Information: program arrangement information) such as nic Program Guide: an electronic program guide) is used to transfer information of all BS digital broadcast stations to all TSs (Transp
Ort Stream), which is different from so-called all-station SI, in which the information of the own station is put in its own TS, the TS is coded, modulated, and transmitted on each channel. Have been.

On the other hand, the most commonly considered mobile receiver is an in-vehicle receiver. JP-A-11-304500 and JP-A-11-1754 disclose in-vehicle receivers.
No. 57, a bus connection using IEEE 1394,
System control is considered.

[0005]

In terrestrial digital broadcasting, there is a high possibility that each station SI will be used as described above. However, in this case, the problem is that the SI information other than the currently selected channel is used. The latest information is not available. Although the program in the channel of the SI information, especially the EPG, may be changed, the changed EPG can be updated for the currently received channel. However, even if the SI information is changed for a channel that is not currently received, it cannot be known. Therefore, when a channel other than the channel currently being received is reselected, it is first necessary to recognize whether or not the SI information has been changed, and to update the SI information if there is any change. This took time, and there was a problem that comfortable tuning was not performed. In addition, when the frequency of updating the 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, the operating power of the digital broadcast receiving apparatus being switched between a commercial power supply and a battery. The present invention is to provide a digital broadcast receiving apparatus for updating additional information such as program arrangement information.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a receiving section for receiving, selecting, and demodulating a digital broadcast signal and a transmission signal containing additional information of the digital broadcast signal, and including a signal demodulated by the receiving section. A demultiplexing unit that separates the additional information, a storage unit that stores the additional information separated by the demultiplexing unit, and whether a receiver of the digital broadcast receiving device has selected to use the digital broadcast receiving device. And a power supply state determination unit that outputs a power supply state signal indicating whether the power used in the digital broadcast receiving apparatus is power from a commercial power supply or power from a battery. Receiving the reproduction request signal and the power supply status signal, wherein the power supply status signal is a signal indicating power from a commercial power supply, and the request signal is the digital broadcast reception signal. When it is a signal indicating that the receiver has not been selected for use, the receiver and the demultiplexer are operated to check the update status of the additional information included in the signal demodulated by the receiver and have been updated. If the storage operation of storing the updated additional information in the storage unit is performed a predetermined number of times, the power supply state signal is a signal indicating power from a battery, and the request signal uses the digital broadcast receiving device. When the signal indicates that no selection has been made, a control unit that controls the storage operation to be performed or not performed less than the predetermined number of times is provided.

According to the present invention, there is provided a receiving section for receiving a digital broadcast signal and a transmission signal containing the additional information of the digital broadcast signal, selecting a channel, and demodulating the received signal, and separating the additional information contained in the signal demodulated by the receiving section. A demultiplexing unit, a storage unit for storing necessary information among the additional information separated by the demultiplexing unit, and whether a receiver of the digital broadcast receiving apparatus has selected to use the digital broadcast receiving apparatus. And a power supply state determination unit that outputs a power supply state signal indicating whether the power used by the digital broadcast receiving apparatus is power from a commercial power supply or power from a battery. And a request storage unit that stores an information request signal that requests the necessary information among the additional information, and receives the request signal, the power supply state signal, and the information request signal, When the power supply state signal is a signal indicating power from a commercial power supply and the request signal is a signal indicating that the digital broadcast receiving apparatus is not selected for use, the receiving unit and the demultiplexing unit A storage operation for storing the updated necessary information in the storage unit by checking the update status of the required information indicated by the information request signal included in the signal demodulated by the receiving unit and updating the updated required information if updated Is performed a predetermined number of times, and when the power supply state signal is a signal indicating power from a battery and the request signal is a signal indicating that the digital broadcast receiving apparatus is not selected for use, the storage operation is performed. And a control unit that controls the number of times to perform the number of times less than or equal to the predetermined number of times.

According to the present invention, there is provided a receiving section for receiving, selecting, and demodulating a digital broadcast signal and a transmission signal including additional information of the digital broadcast signal, and separating the additional information included in the signal demodulated by the receiving section. A demultiplexing unit, a storage unit for storing necessary information among the additional information and the external data information separated by the demultiplexing unit, and a receiver of the digital broadcast receiving device selecting the digital broadcast receiving device to use the digital broadcast receiving device. A reception selection unit that outputs a request signal indicating whether or not the power is used in the digital broadcast receiving device,
A power supply state determination unit that outputs a power supply state signal indicating power from a commercial power supply or power from a battery; and a request for the necessary information among the additional information and the external data information stored in the storage unit. A request storage unit that stores an information request signal to be received, the request signal, the power supply status signal, and the information request signal, wherein the power supply status signal is a signal indicating power from a commercial power supply, and the request signal When the signal indicates that the digital broadcast receiving apparatus is not selected for use, the receiving unit and the demultiplexing unit are operated to check the update status of the necessary information indicated by the information request signal and update If so, a storage operation of storing updated information in the storage unit is performed a predetermined number of times, and the power supply state signal is a signal indicating power from a battery and the request When the signal is a signal indicating that the digital broadcast receiving apparatus is not selected for use, the control unit controls the storage operation to be performed or not performed less than the predetermined number of times. Features.

According to the present invention, there is provided a receiving section for receiving, selecting, and demodulating a digital broadcast signal and a transmission signal including additional information of the digital broadcast signal, and separating the additional information included in the signal demodulated by the receiving section. Multiplexing / demultiplexing unit, a storage unit for storing the additional information and external data information separated by the multiplexing / demultiplexing unit, and whether or not a receiver of the digital broadcast receiving device has selected to use the digital broadcast receiving device. And a power supply state determination unit that outputs a power supply state signal indicating whether the power used by the digital broadcast receiving apparatus is power from a commercial power supply or power from a battery. Receiving the request signal, the power supply state signal, and the information request signal, wherein the power supply state signal is a signal indicating power from a commercial power supply, and the request signal is When the signal indicates that the digital broadcast receiving apparatus is not selected for use, the receiving unit and the multiplexing / demultiplexing unit are operated to check the update status of the additional information and the external data information. A storage operation of storing updated information in the storage unit,
Performed a predetermined number of times, when the power supply state signal is a signal indicating the power from the battery and the request signal is a signal indicating that the digital broadcast receiving apparatus is not selected to use, the storage operation, A control unit for controlling the number of times to be performed less than the predetermined number of times or not to be performed.

The present invention is characterized in that the additional information is at least one of program arrangement information and data information.

The present invention is characterized in that a bidirectional communication unit is provided which is controlled by the control unit, performs bidirectional communication with the outside, obtains communication information from the outside, and can use it as the external data information. .

The present invention is characterized in that the external data information is at least one of program arrangement information and data information.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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 a configuration of a digital broadcast signal receiving apparatus according to a first embodiment of the present invention. Here, an in-vehicle receiver is assumed.

Reference numeral 101 denotes an input terminal for a broadcast signal, 102 denotes a tuning 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, 1
11 is a PSI / SI storage unit, 112 is a data storage unit, 113 is a receiver selection unit, 114 is a digital broadcast receiving device, and 115 is a power supply state determination unit.

An input terminal 101 receives a received broadcast signal. This input signal includes an analog broadcast signal and a digital broadcast signal.

According to the control signal from the control unit 110, the tuning unit 102 selects one reception channel from the broadcast signals received from the input terminal 101, 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 has been received. Digital demodulation section 103 digitally demodulates the gain-controlled intermediate frequency reception channel signal and outputs a TS signal.

The demultiplexing unit 104 extracts the audio data or the video data requested by the control unit 110 and outputs them to the audio decoding unit 105 and the video decoding unit 107, respectively. Also,
The information data transmitted by the data broadcast is processed by the control unit 110 and output to the presentation processing unit 108.

The audio decoder 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 signal to the output terminal 109.

On the other hand, the demultiplexing unit 104 is a P / P
The SI / SI information is extracted and stored in the PSI / SI storage unit 111.

The digital broadcast signal selected by the tuning unit 102 includes data broadcasts such as stocks and weather forecasts. The data broadcast information is extracted by the demultiplexing unit 104 and stored in the data storage unit 112.

Receiver selection section 113 outputs a reproduction request signal indicating whether the receiver of digital broadcast receiving apparatus 114 has selected or not selected to use 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 control.

The power supply state determination unit 115 determines whether the power used by the digital broadcast receiving apparatus 114 is power from a generator as a commercial power supply, power from a battery, or power supply is cut off or limited. A power supply status signal indicating the case is output. This will be described with reference to FIG.

FIG. 2 is a schematic view showing a general engine switch of an automobile. 201 is a rotary plate having a key insertion slot, 202 is a key position display fixing plate,
It has a position, an ON position, and a START position, and can be set to any position by rotating the rotary plate 201 having a key insertion port.

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

ON indicates "ON", in which the engine is rotating and the generator is driven to supply power to the digital broadcast receiving apparatus 114 from the generator. START indicates "start" and is a position where the engine is started,
After starting, return 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 the start and comes to the ON position, it is more reliable to determine the supply from the generator by detecting the rotation of the engine or the generator.

In some cases, it is also possible to obtain a power supply status signal from a voltage value or a voltage waveform of electricity supplied to the digital broadcast receiving apparatus 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, wherein 301 is START, 302 is a power supply state determination step, and 303, 304, and 305 are selected to use the digital broadcast receiving device 114 from the receiver selection unit 113. Determination step of a playback request signal indicating whether or not the playback request signal has been selected, 30
6 is a process 307 performed when the power supply is cut off or restricted and the digital broadcast receiving device 114 is not selected, and 307 is a process performed when the power supply is cut off or restricted and the digital broadcast receiving device 114 is not selected. The processing b and 308 performed when the user selects to use the power are the power from the battery and the processing c and 309 are performed when the digital broadcast receiving apparatus 114 is not selected and the power supply is the power from the battery. And a process d, 310 performed when the digital broadcast receiver 114 is selected for use, and a process e, 310 performed when power is supplied from the generator and the digital broadcast receiver 114 is not selected. This is a process f performed when the power supply is the power from the generator and the digital broadcast receiving apparatus 114 is selected for use.

In the processing a of step 306 and the processing b of step 307, if the power supply is completely cut off, no difference can be made between the processings to be performed, but the power supply is more restricted than the normal power supply. In the case of a so-called dormant state, it may be better to make a difference in the processing. For example, in the case of the process a in step 306, there may be a case where an AV device or a navigation device is selected, and the sleep process of the selected device is enabled. In the process b of step 307, the digital broadcast receiving device 114 is selected, so that the digital broadcast receiving device 114 is put into sleep mode, for example, when an emergency information broadcast is received, an automatic start-up is performed, or an emergency alert is notified. Can be considered.

In the processing d in step 309 and the processing f in step 311, the digital broadcast receiving apparatus 114 is generally set to a usable state, the reception channel selected last time is selected, and the audio signal is output from the output terminals 106 and 109 respectively. , And a video signal is output and reproduced on a speaker or a monitor (not shown in FIG. 1). However, in the process d of step 309, since the power is supplied from the battery, the apparatus is started up in a so-called energy saving mode. It is also conceivable to set the state to be restricted.

In the processing c in step 308 and the processing e in 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 EPG which is additional information of each channel is operated. PS such as
An operation for acquiring I / SI information is performed. More specifically, first, as a first step, the tuning section 102, the digital demodulation section 103, and the demultiplexing section 104 are controlled to check the update status of the PSI / SI information of the reception channel that has been received until the last time, and If so, the PSI / SI information is extracted and stored in the PSI / SI storage unit 111. Next, as a second step, the control unit controls the channel selection unit 102 to search for other reception channels other than those previously received, and then controls the digital demodulation unit 103 and the demultiplexing unit 104 to select the reception channel selected this time. The PSI / SI information is updated and the PSI / SI information is extracted. If the PSI / SI information is 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. Step 30
In the process c of 8, the process is once ended, and this process is repeated after a certain period of time. In the processing e of the step 310, this processing is immediately repeated again. In the process c of step 308, it is conceivable that only the first stage is performed or not performed.

With the above processing, in the embodiment of the digital broadcast reception shown in FIG.
Update of the change of the I / SI information can be performed.

On the other hand, processing c of step 308 and step 310
In the process e, since the digital broadcast receiving apparatus 114 is not selected, the digital broadcast receiving apparatus 11 is not selected while the digital broadcast receiving apparatus 114 is not selected.
4 to operate to acquire data broadcast information of each channel. Specifically, first, as a first step, the tuning unit 102, the digital demodulation unit 103, and the demultiplexing unit 104 are controlled to check the update status of the data broadcast information of the reception channel that has been received until the last time. If so, the data broadcast information is extracted and stored in the data storage unit 112. Next, as a second step, the tuner 102 is controlled to search for other reception channels than those previously received, and then the digital demodulator
The control unit 103 controls the multiplexing / demultiplexing unit 104 to check the update status of the data broadcast information of the currently selected reception channel, and if updated, extracts the data broadcast information and stores it in the data storage unit 112. This is performed in all frequency bands of digital broadcasting. In the process c of the step 308, the process is once ended, and this process is repeated after a certain period of time. Step 310
This processing is immediately repeated in the processing e. In the process c of step 308, it is conceivable that only the first stage is performed or not performed.

With the above processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 1, the data broadcast information can be updated in accordance with the power supply state.

FIG. 4 is a block diagram showing the configuration of a digital broadcast signal receiving apparatus for receiving a digital broadcast signal according to a second embodiment of the present invention. Here, too, an in-vehicle receiver is assumed. The same reference numerals as in FIG. 1 indicate 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 tuning section 102 includes data broadcasts such as stocks and weather forecasts. From the input terminal 402, the data request information indicating the information required by the receiver in the data broadcast is input. This data request information is stored in the data request storage unit 401. The requested data broadcast information is extracted by the demultiplexing unit 104, and the data storage unit 1
Store it in 12.

The operation of FIG. 4 will be described using the processing steps of FIG. In the processing c in step 308 and the processing e in 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 request information, which is additional information of each channel, Performs the operation of acquiring the information requested by the user. Specifically, first, as the first stage, the tuning unit 102 and the digital demodulation unit 1
03, controlling the demultiplexing unit 104 to check the update status of the information requested by the data request information, which is the additional information of the reception channel received up to the previous time, and if it has been updated, it is the additional information. The information requested by the data request information is extracted and stored in the data storage unit 112. Next, as a second step, the tuner 102 is controlled to search for other reception channels than those previously received, and then the digital demodulator 10
3. The multiplex / demultiplex unit 104 is controlled to check the update status of the information requested by the data request information, which is the additional information of the currently selected reception channel. Extract the information requested by the information,
The data is 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 once ended, and this process is repeated after a certain period of time. In the process e of step 310, this process is immediately repeated. In the process c of step 308, it is conceivable that only the first stage is performed or not performed.

By the above processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 4, it is possible to update the change of the information requested by the data request information, which is additional information, according to 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. Here, too, an in-vehicle receiver is assumed. 4 denote the same functions, and 501 denotes an external data input terminal. The data request information input from the input terminal 402 in FIG. 5 includes not only the data included in the data broadcast but also external data obtained by being input to the input terminal 501 from a device other than the digital broadcast receiving device 114. In.

Next, the external data will be described with reference to FIG. FIG. 6 is a schematic connection diagram of devices mounted on an automobile. 601 is the system control unit, 602 is the bus line, 60
3 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
Denotes an AV device, and 609 and 610 denote vehicle state information determination units such as speed and engine speed.

In FIG. 6, a digital broadcast receiving device 603, a navigation 604, a monitor 605, a power supply state determining unit 606,
The AV devices 607 and 608 and the vehicle state information determination units 609 and 610 are connected by a single bus 602, and a so-called in-vehicle LAN (Local Are).
a Network: local area network) is constructed, and the system control unit 601 controls the entire system.
In such a system, external data can be easily extracted from devices other than the digital broadcast receiving device 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 the region 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 information requested by the data request information, which is the requested additional information, is demultiplexed by the demultiplexing unit 104 controlled by the control unit 110 with reference to the position data from the navigation obtained from the input terminal 501. The information is extracted and stored in the data storage unit 112.

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

Specifically, first, the first stage
102, the digital demodulation unit 103, the demultiplexing unit 104,
Investigate the update status of the data broadcast information of the receiving channel received until the previous time and the location information from the outside, extract the data broadcast information if the information close to the area was updated while referring to the location information, and The information is stored in the storage unit 112.

Next, as a second step, the tuner 102 is controlled to search for other reception channels other than the one previously received, and to check positional information from the outside. Controls 104 to check the update status of the information requested by the data request information, which is additional information closely related to the area of the currently selected reception channel while referring to the position information. The data broadcast information closely contacted 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 the step 308, the process is once ended, and this process is repeated after a certain period of time. Step 310
This processing is immediately repeated in the processing e. In the process c of step 308, it is conceivable that only the first stage is performed or not performed.

According to the above-described processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 5, it is possible to update the information in close contact with the area in accordance with the power supply state and the receiving position of the digital broadcast.

FIG. 7 is a block diagram showing the configuration of a fourth embodiment of a digital broadcast receiving apparatus for receiving a digital broadcast signal according to the present invention. The same reference numerals as those in FIG. 5 indicate 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, from the Internet web. As an example, the position information from the navigation 604 in FIG. 6 is external data input from the input terminal 501 in FIG.

The two-way communication unit 701 controlled by the control unit 110 which refers to the position data from the navigation obtained from the input terminal 501 provides information close to the area or selectable stations in the area and the EPG of the station. The request is received, and stored in the data storage unit 112. Alternatively, the PSI / SI information may be requested by the bidirectional communication unit 701 and stored in the PSI / SI storage unit 111.

The operation of FIG. 7 will be described using the processing steps of FIG. Since the operation in FIG. 7 is performed separately from the broadcast reception, it does not matter whether the digital broadcast receiver is selected or not. In the processing c in step 308 and the processing d in step 309, and the processing e in step 310 and the processing f in step 311, the update status of the information received by the two-way communication Investigate and refer to the location information, if the information close to the area or the selectable stations in the area and the EPG of the station have been updated, request and receive the information again in the two-way communication unit 701 to extract the information. ,
The data is stored in the data storage unit 112. In the processing c in step 308 and the processing d in step 309, the processing is once ended, and this processing is repeated after a certain period of time. Processing e in step 310
And this process is immediately repeated in the process f of step 311.

By the above processing, in the embodiment of the digital broadcast receiving apparatus shown in FIG. 7, the information close to the area or the selectable stations in the area and the stations selectable in accordance with the power supply state and the receiving position of the digital broadcast. Information such as the EPG can be updated.

Note that the two-way communication unit 701 operates as shown in FIG.
The same effect can be obtained by providing not only for, but also for FIGS.

Although the above description has been made assuming an in-vehicle receiver, power supply from a commercial power supply such as a commercial power supply such as a generator, an AC power supply through a household AC outlet or the like, and power supply from a battery are provided. The present invention can be applied to a digital broadcast receiving apparatus of a switching type. For example, the present invention can be applied to a portable digital broadcast receiving apparatus in which a digital broadcast receiving section is built in a notebook personal computer and a built-in battery is loaded.

[0056]

According to the present invention, a digital broadcast receiving apparatus for receiving a digital broadcast signal and supplying the operating power of the digital broadcast receiving apparatus by switching between a commercial power supply and a battery is provided. A digital broadcast receiving apparatus that updates additional information such as program arrangement information of a broadcast signal can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a digital broadcast signal receiving apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a general engine switch of an automobile.

FIG. 3 is a flowchart showing processing steps of a control unit 110.

FIG. 4 is a block diagram illustrating a configuration of a digital broadcast signal receiving apparatus for receiving a digital broadcast signal according to a second embodiment of the present invention.

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.

FIG. 6 is a schematic diagram of connection of devices mounted on an automobile.

FIG. 7 is a block diagram illustrating a configuration of a fourth embodiment of a digital broadcast receiving device that receives a digital broadcast signal according to the present invention.

[Explanation of symbols]

101: Broadcast signal input terminal, 102: Tuning unit, 103: Digital demodulation unit, 104: Demultiplexing unit, 105: Sound decoding unit, 10
6 ... Audio output terminal, 107 ... Video decoding unit, 108 ... Presentation processing unit, 109 ... Video output terminal, 110 ... Control unit, 111 ... PSI
/ SI storage unit, 112: data storage unit, 113: receiver selection unit, 114: digital broadcast receiving device, 115: power supply state determination unit, 302: power supply state determination step, 303, 304, 3
05: a step of judging a reproduction request signal indicating whether the digital broadcast receiving apparatus 114 from the receiver selecting section 112 has been selected or not to be used, 306 if the power supply is cut off or restricted, and Digital broadcast receiver
Processes a and 307 performed when 114 is not selected, Processes b and 308 performed when the power supply is cut or limited and the digital broadcast receiving device 114 is selected for use, and 308. Processing c, 309 to be performed when power is supplied from the battery and the digital broadcast receiving apparatus 114 is not selected. Processing to be performed when power is supplied from the battery and the digital broadcast receiving apparatus 114 is selected for use. d, 310: Processing to be performed when the power supply is the power from the generator and the digital broadcast receiver 114 is not selected e, 311: The power supply is the power from the generator and the digital broadcast receiver 114 will be used F, 401: data request storage unit, 402: data request information input terminal, 501: external data input terminal, 701
... two-way communication unit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jin Akiyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Digital Media Development Division, Hitachi, Ltd. 5C025 BA25 BA26 BA27 DA01 DA07 DA10 5C026 EA01 5K061 BB06 EE00 EE01 EF01 JJ07

Claims (7)

[Claims] 1. A receiving section for receiving, selecting, and demodulating a digital broadcast signal and a transmission signal including additional information of the digital broadcast signal, and multiplexing for separating the additional information included in the signal demodulated by the receiving section. A separation unit; a storage unit for storing the additional information separated by the demultiplexing unit; and a request signal indicating whether a receiver of the digital broadcast receiving apparatus has selected to use the digital broadcast receiving apparatus. A power supply state determination unit that outputs a power supply state signal indicating whether power used by the digital broadcast receiving apparatus is power from a commercial power supply or power from a battery; and the request signal and the request signal. Receiving a power supply status signal, wherein the power supply status signal is a signal indicating power from a commercial power supply, and the request signal is selected to use the digital broadcast receiving apparatus. When a signal indicating that no is
A storage operation of operating the receiving unit and the demultiplexing unit to check an update status of the additional information included in the signal demodulated by the receiving unit, and storing the updated additional information in the storage unit if updated; Is performed a predetermined number of times, and when the power supply state signal is a signal indicating power from a battery and the request signal is a signal indicating that the digital broadcast receiving apparatus is not selected for use, the storage is performed. A digital broadcast receiving apparatus comprising: a control unit that controls the operation to be performed or not performed less than the predetermined number of times. 2. A receiving section for receiving, selecting, and demodulating a digital broadcast signal and a transmission signal including additional information of the digital broadcast signal, and multiplexing for separating the additional information included in the signal demodulated by the receiving section. A separation unit; a storage unit for storing necessary information among the additional information separated by the multiplex separation unit; and a determination whether a receiver of the digital broadcast receiving apparatus has selected to use the digital broadcast receiving apparatus. A power supply state determination unit that outputs a power supply state signal indicating whether the power used in the digital broadcast receiving apparatus is power from a commercial power supply or power from a battery. A request storage unit for storing an information request signal for requesting the necessary information among the additional information; receiving a request signal, the power supply state signal, and the information request signal; When the supply state signal is a signal indicating electric power from a commercial power supply and the request signal is a signal indicating that the digital broadcast receiving apparatus is not selected for use, the receiving section and the demultiplexing section are operated. A storage operation of storing the updated necessary information in the storage unit if the information request signal included in the signal demodulated by the demodulation unit is checked and updated if necessary. Performed a predetermined number of times, when the power supply state signal is a signal indicating the power from the battery and the request signal is a signal indicating that the digital broadcast receiving apparatus is not selected to use, the storage operation, A digital broadcast receiving apparatus comprising: a control unit configured to control the number of times to be performed less than or equal to the predetermined number of times. 3. A receiving section for receiving, selecting, and demodulating a digital broadcast signal and a transmission signal including additional information of the digital broadcast signal, and multiplexing for separating the additional information included in the signal demodulated by the receiving section. A separation unit; a storage unit for storing necessary information among the additional information and the external data information separated by the demultiplexing unit; and a receiver of the digital broadcast receiving device selecting the receiver to use the digital broadcast receiving device. A reception selection unit that outputs a request signal indicating whether or not the power is supplied, and a power supply state that outputs a power supply state signal indicating whether the power used in the digital broadcast receiving apparatus is power from a commercial power supply or power from a battery. A determination unit; a request storage unit that stores an information request signal that requests the necessary information among the additional information and the external data information stored in the storage unit; Receiving the power supply state signal and the information request signal, that the power supply state signal is a signal indicating power from a commercial power supply, and that the request signal is not selected to use the digital broadcast receiver. When the signal indicates, the receiving unit and the demultiplexing unit are operated to check the update status of the necessary information indicated by the request signal, and if the information is updated, the storage operation of storing the updated information in the storage unit Is performed a predetermined number of times, and when the power supply state signal is a signal indicating power from a battery and the information request signal is a signal indicating that the digital broadcast receiving apparatus is not selected for use, the storage is performed. A digital broadcast receiving apparatus comprising: a control unit that controls the operation to be performed or not performed less than the predetermined number of times. 4. A receiving section for receiving, selecting and demodulating a digital broadcast signal and a transmission signal including additional information of the digital broadcast signal, and multiplexing for separating the additional information included in the signal demodulated by the receiving section. A separation unit; a storage unit for storing the additional information and the external data information separated by the demultiplexing unit; and indicating whether a receiver of the digital broadcast receiving device has selected to use the digital broadcast receiving device. A reception selection unit that outputs a request signal; a power supply state determination unit that outputs a power supply state signal indicating whether power used in the digital broadcast receiving device is power from a commercial power supply or power from a battery; Receiving a request signal, the power supply state signal, and the information request signal, wherein the power supply state signal is a signal indicating power from a commercial power supply, and the request signal is the digital When the signal indicates that the broadcast receiving device is not selected for use, the receiving unit and the demultiplexing unit are operated to check the update status of the additional information and the external data information. The storage operation of storing the obtained information in the storage unit is performed a predetermined number of times, the power supply state signal is a signal indicating power from a battery, and the request signal is selected to use the digital broadcast receiving apparatus. A digital broadcast receiving apparatus, comprising: a control unit that controls the storage operation to be performed or not performed less than the predetermined number of times when the signal indicates that there is no storage operation. 5. The digital broadcast receiving apparatus according to claim 1, wherein said additional information is at least one of program arrangement information and data information. 6. The digital broadcast receiving apparatus according to claim 3, wherein said external data information is obtained by performing bidirectional communication with the outside under control of said control unit and obtaining communication information from the outside. A digital broadcast receiving device, comprising: a directional communication unit. 7. The digital broadcast receiving apparatus according to claim 3, wherein said external data information is at least one of program arrangement information and data information.