JP2010109842A - Digital broadcast reception device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast reception device whose battery consumption can be suppressed by limiting the reception of program information (EIT) depending on a remaining capacity of the battery. <P>SOLUTION: A digital broadcast reception device 10 includes a battery 23 for supplying electric power, a tuner unit 12 for receiving the program information for each channel, a main control unit 17 for setting up a reception limitation to the program information received by the tuner unit 12, and a remaining capacity detection unit 22 for detecting the remaining capacity of the battery 23. When the remaining capacity detection unit 22 detects that the remaining capacity of the battery 23 is less than or equal to a predetermined value, the tuner unit 12 limits the reception of the program information based on the reception limitation set up by the main control unit 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus, and more particularly to a digital broadcast receiving apparatus having a function of receiving program information for each channel.

  In terrestrial digital broadcasting, video and audio are transmitted by MPEG-2 TS (Transport Stream). In addition to this video and audio, program information is provided as a service to viewers. This program information is provided by repeatedly transmitting a table constituting PSI / SI (Program Specific Information / Service Information) along with a program according to a certain period.

  PSI is standardized by MPEG2 Systems (ISO / IEC13818-1, ITU-T H.222.0), and is information necessary for selecting a required program. This PSI is composed of four tables: PAT (Program Association Table), PMT (Program Map Table), NIT (Network Information Table), and CAT (Conditional Access Table). Among these, NIT is a table describing a list of all services that can be selected by the receiver and which TS each service is included in. PAT is a table in which PIDs of TS packets that transmit PMT are described. PMT is a table in which PIDs of TS packets that transmit each encoded stream (ES: Elementary Stream) constituting a program are described. It is.

  On the other hand, SI is defined by ARIB STD-B10, and is various information defined for the convenience of program selection. This SI includes, for example, SDT (Service Description Table) describing a list of all services included in the TS, event information (for each program, accompanying information such as start time, program length, program name, performer, genre, etc. EIT (Event Information Table) that describes (including), BIT (Broadcaster Information Table) that describes all services collectively for each provider group (broadcaster), and SDTT that describes the download schedule for software update of the receiver (Software Download Trigger Table) and other tables.

  The electronic program guide in terrestrial digital broadcasting is created based on the program information notified by the EIT. According to this EIT, only program information of the channel being viewed can be acquired, so program information of other channels must be acquired at times other than viewing. At this time, it is known that it usually takes about 180 seconds to acquire EIT for one week per channel.

  FIG. 8 is a flowchart for explaining an example of an EIT acquisition procedure by a general fixed receiver. First, the fixed receiver refers to the channel list and performs channel selection processing for the designated channel (step S1), receives the PAT of the selected channel, and transmits the PID (Packet) of the TS packet that transmits the PMT. ID) is acquired (step S2).

  Next, the fixed receiver receives the PMT based on the above PID, acquires the PID of the TS packet that transmits each ES constituting the program (step S3), and based on the acquired PID, the program Filtering of each ES that constitutes is started (step S4). Then, the fixed receiver acquires all H-EITs from the filtered ES data (for example, acquires one week's worth of H-EITs) (step S5).

  Next, the fixed receiver determines whether or not H-EIT data has been received for all channels on the channel list (step S6), and if H-EIT data for all channels has been received (YES). ), An electronic program guide is created from all the H-EIT data (step S7). In step S6, if H-EIT data for all channels has not been received (NO), the process returns to step S1 and the process is repeated.

  In the case of the conventional fixed receiver described with reference to FIG. 8, it takes about 180 seconds to receive (acquire) one week of H-EIT per channel as described above. H-EIT is intended for display on a fixed receiver.

  On the other hand, mobile terminals capable of receiving one-segment broadcasting, such as recent mobile phones, have become widespread. Since such a portable terminal is battery-powered, as described above, if it takes 180 seconds per channel to acquire EIT, there is a problem that the battery is quickly consumed.

On the other hand, for example, Patent Document 1 describes a digital broadcast receiver that updates program information of a digital broadcast signal in accordance with a power supply state. This digital broadcast receiver outputs power supply status signals indicating whether the power used is from a generator or commercial power source, from a battery, or when power supply is cut or restricted. A supply status determination unit is provided, and the program arrangement information of the digital broadcast signal is updated based on the power supply status signal.
JP 2007-267406 A

  The invention described in Patent Document 1 is applied to an in-vehicle receiver and the like, and can secure a power source from other than the battery. However, in the case of a portable terminal device that is assumed to be carried around, such as a mobile phone, it is considered that it is mostly used with a battery. In such a case, if EIT for one week is acquired for all the channels registered in the channel list, it takes a lot of time, the tuner startup time becomes long, and the battery is consumed. It was.

  On the other hand, it is conceivable to limit the reception time of the EIT, thereby shortening the startup time of the tuner and suppressing battery consumption. For example, since the user does not want to watch programs of all channels in the electronic program guide, it is considered that EIT of channels that the user does not view is unnecessary. Further, since not all channels registered in the channel list can be received, it is considered that EIT of channels that cannot be received is not necessary. Further, depending on the user, only a program in a specific time zone may be viewed, and it is considered that EIT of a program in a time zone that is not viewed is not necessary.

  However, the prior art including the invention described in Patent Document 1 has such a technical idea, that is, a technique for shortening the startup time of the tuner and suppressing battery consumption by restricting reception of EIT. There was no thought and it had not been realized so far.

  The present invention has been made in view of the above circumstances, and a digital broadcast receiver capable of suppressing battery consumption by restricting reception of program information (EIT) in accordance with the remaining capacity of the battery. It aims to provide.

  In order to solve the above-mentioned problem, the first technical means is a digital broadcast receiving apparatus provided with a battery for supplying power, the program information receiving means for receiving program information for each channel, and the program information receiving means Receiving limit setting means for setting a reception limit for the program information received in the above and a remaining amount detecting means for detecting the remaining amount of the battery, wherein the remaining amount of the battery is less than a predetermined value by the remaining amount detecting means. When it is detected that the program information has been received, the program information receiving means restricts the reception of program information based on the reception restriction set by the reception restriction setting means.

  According to a second technical means, in the first technical means, the reception restriction setting means is a channel list of an area designated by a user or a plurality of channels that can be received in the area, except for unnecessary channels. It is characterized in that it is set so as to receive program information of channels.

  A third technical means includes a determination means for determining the reception state of the channel based on an index indicating the reception state of the channel received by the digital broadcast receiving device in the first technical means, and the reception restriction setting The means is characterized in that it is set so as to receive only the program information of the channel whose reception state is determined to be above a certain level by the determination means.

  According to a fourth technical means, in the third technical means, the indicator indicating the reception state is any one or more of an AGC voltage, a C / N value, and a BER value.

  According to a fifth technical means, in the digital broadcast receiving apparatus according to claim 1, the reception restriction setting means receives only program information of programs included in a time zone designated by the user for each channel. It is characterized by setting.

  Sixth technical means comprises electronic program guide creation means for creating an electronic program guide based on program information for each channel received by the program information receiving means in any one of the first to fifth technical means. The electronic program guide creating means receives the electronic program guide by the reception restriction setting means when it is detected by the remaining power detecting means that the remaining amount of the battery is below a predetermined value. Only the received program information is rewritten based on the restriction, and other program information other than the program information is deleted.

  According to the present invention, since reception of program information (EIT) can be limited according to the remaining capacity of the battery, the startup time of the tuner can be shortened and battery consumption can be suppressed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a digital broadcast receiving apparatus according to the invention will be described with reference to the accompanying drawings. The present invention is applied to a battery-powered tuner device. For example, the present invention can be applied to a portable terminal device such as a mobile phone having a tuner function, a PDA (Personal Digital Assistant), a notebook PC, or a portable game device. it can.

  FIG. 1 is a block diagram illustrating a configuration example of a digital broadcast receiving apparatus according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a digital broadcast receiving apparatus. The digital broadcast receiving apparatus 10 includes an antenna 11, a tuner unit 12, a demodulation processing unit 13, a TSDEMUX 14, a video decoding unit 15, an audio decoding unit 16, a main control unit 17, and data storage. Unit 18, key operation input unit 19, display unit 20, speaker 21, battery 22, and remaining amount detection unit 23.

  The tuner unit 12 selects one reception channel from the digital broadcast signal received by the antenna 11 when a channel selection instruction is made by a user operation or when a time for viewing reservation or recording reservation arrives. . Then, the demodulation processing unit 13 demodulates the signal of the reception channel selected by the tuner unit 12 and outputs it as a TS (Transport Stream) signal.

  The TSDMUX 14 separates the TS signal output from the demodulation processing unit 13 into video data, audio data, and program information (PSI / SI) according to an instruction from the main control unit 17, and sends the video data to the video decoding unit 15. The audio data is output to the audio decoding unit 16 and the PSI / SI is output to the main control unit 17.

The video decoding unit 15 decodes the video data separated and output by the TSDEMUX 14 into a video signal capable of video display, and outputs the decoded video signal to the display unit 20. The display unit 20 is a display such as an LCD (Liquid Crystal Display).
The audio decoding unit 16 decodes the audio data separated and output by the TSDEMUX 14 into an audio signal that can be output as audio, and outputs the decoded audio signal to the speaker 21.

The main control unit 17 includes a CPU and a memory for controlling various functions of the digital broadcast receiving apparatus 10. The main control unit 17 has a function of generating an electronic program guide based on the EIT included in the PSI / SI separated and output by the TSDEMUX 14.
The data storage unit 18 is a storage unit for storing PSI / SI separated and output by the TSDEMUX 13, values set by the user, and the like.
The key operation input unit 19 includes a group of operation keys for receiving an operation input from a user.

  The main feature of the present invention is to suppress battery consumption by restricting reception of program information (EIT) according to the remaining capacity of the battery. As a configuration for this, the digital broadcast receiving apparatus 10 receives the program information (that is, EIT included in the PSI / SI) for each channel by the tuner unit 12 corresponding to the program information receiving unit and the tuner unit 12. A main control unit 17 corresponding to a reception limit setting unit that sets a reception limit for the EIT, a battery 23 that supplies power, and a remaining amount detection unit 22 that corresponds to a remaining amount detection unit that detects the remaining amount of the battery 23 With.

  When the remaining amount detection unit 22 detects that the remaining amount of the battery 23 has become a predetermined value or less, the tuner unit 12 restricts reception of EIT based on the reception restriction set by the main control unit 17. To do. As a method of restricting reception, for example, first, the EIT of the remaining channels excluding unnecessary channels from the channel list of the region specified by the user or a plurality of channels that can be received in the region is received. Secondly (channel restriction), and secondly, only EITs of programs included in receivable channels (that is, channels whose reception level is equal to or higher than a certain level) are received (reception level restriction). For example, it is conceivable to restrict the reception of only the EIT of the program in the time zone desired by the user for each channel (time zone restriction).

  When executing the first reception restriction method, the main control unit 17 is set to receive only the EIT of the channel specified by the user, for example, as the EIT of the remaining channels excluding unnecessary channels. Specifically, the main control unit 17 receives an input of a channel (for example, 4, 6, 8, 10 ch, etc.) that the user wants to view through the key operation input unit 19, and stores information on this channel in the data storage unit 18. Remember. When the remaining amount detection unit 22 detects that the remaining amount of the battery 23 is equal to or less than a predetermined value, the tuner unit 12 receives only the EIT of the channel stored in the data storage unit 18. Be controlled.

  When executing the second reception restriction method, the main control unit 17 functions as a determination unit that determines the reception state of the channel based on the index indicating the reception state of the channel received by the digital broadcast receiving device 10. It is set so that only the EIT of the channel whose reception state is determined to be a certain level or higher by the determination means is received. For example, an AGC voltage, a C / N value, a BER value, and the like can be considered as an index indicating the reception state, and a reception state determination method using these indexes will be described with reference to FIG.

  FIG. 2 is a block diagram illustrating a detailed configuration example of a tuner unit and a demodulation processing unit included in the digital broadcast receiving apparatus of the present invention. The tuner unit 12 and the demodulation processing unit 13 can also be configured as a tuner IC (Integrated Circuit) and a demodulation IC, respectively.

  The tuner unit 12 selects a digital broadcast signal received from the antenna 11. For this reason, the tuner unit 12 includes, for example, a preamplifier 121, an RF (Radio Frequency) band-pass filter (BPF) 122, an RF variable gain amplifier (VGA) 123, a mixer ( A mixer (124), a local oscillator (OSC) 125, a BPF 126, an IF (Intermediate Frequency) amplifier 127, a level detection circuit 128, and a voltage control amplifier 129.

  The preamplifier 121 amplifies the digital broadcast signal received by the antenna 11 and outputs it to the BPF 122. The BPF 122 passes only a predetermined frequency band with respect to this RF signal and outputs it to the VGA 123. The VGA 123 variably amplifies the gain of the RF signal that has passed through the band, and outputs it to the mixer 124. The mixer 124 mixes the frequency oscillated from the OSC 125 with the RF signal output from the VGA 123, and converts the RF signal into an IF signal. The OSC 125 receives a channel selection control signal output from the main control unit 17 in response to channel selection such as a user operation, and locks and locks to a frequency (frequency of the channel selection channel) corresponding to the channel selection control signal. Oscillates at the specified frequency. Thereby, the mixer 124 can convert the RF signal output from the VGA 123 into an IF signal having a frequency corresponding to the channel selection control signal.

  The BPF 126 is a filter that passes a narrower band than the BPF 122, and passes the IF signal output from the mixer 124 through the band. The band to be passed by the BPF 126 has a predetermined range centering on the oscillation frequency of the OSC 125, and the IF signal output from the BPF 126 includes a frequency corresponding to the channel selection control signal. The IF amplifier 127 amplifies the IF signal output from the BPF 126, outputs the IF signal to the demodulation processing unit 13, and outputs it to the level detection circuit 128. The level detection circuit 128 detects the signal level of the IF signal amplified by the IF amplifier 127 and outputs it to the voltage control amplifier 129. The voltage control amplifier 129 controls the voltage according to the signal level output from the level detection circuit 128 and supplies the voltage to the VGA 123. The VGA 123 amplifies the gain of the RF signal by this voltage.

  The demodulation processing unit 13 performs demodulation processing on the digital broadcast signal selected and output by the tuner unit 12. Therefore, the demodulation processing unit 13 includes, for example, an IF automatic gain control (AGC) circuit, an analog / digital converter (A / D) 132, a demodulation circuit 133, and a forward error correction circuit (Forward Error Correction: FEC) 134. The IF AGC circuit includes an IF AGC 135 and an IF amplifier 131.

  The IF AGC 135 is a control circuit that feeds back the gain of the demodulation result of the demodulation circuit 133 to the IF amplifier 131, and the gain of the IF signal received from the tuner unit 12 is made constant so that the gain of the demodulation result becomes constant. And the determined amplification factor is set in the IF amplifier 131. The IF amplifier 131 amplifies the IF signal at the amplification factor set by the IF AGC 135 and outputs the amplified IF signal to the A / D 132. The A / D 132 converts the IF signal output from the IF amplifier 131 into a digital signal and outputs the digital signal to the demodulation circuit 133.

  The demodulation circuit 133 demodulates the input digital signal with a demodulation method corresponding to the modulation method at the broadcasting station. For example, in the case of terrestrial digital broadcasting, a carrier wave (carrier) is basically modulated by three types of modulation schemes of QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), and 64QAM, and OFDM including inverse Fourier transform. It is modulated and transmitted by the (Orthogonal Frequency Division Multiplex) method. Accordingly, the demodulation circuit 133 performs OFDM demodulation processing corresponding to this. The digital signal input to the demodulation circuit 133 is controlled to be constant by the IF AGC 135 and the IF amplifier 131 even if the received radio wave is strong or weak. The FEC 134 performs forward error correction on the demodulated digital signal, and outputs the signal to a subsequent circuit (not shown) (TSDEMUX 14 shown in FIG. 1) except for the digital signal that cannot be corrected.

  From the demodulation result, the main control unit 17 determines that (I) the control value (AGC voltage) of the automatic gain control has exceeded the predetermined value Ta, and (II) the bit error rate (BER) has the predetermined value Tb. When it is detected that (III) the C / N (Carrier to Noise ratio) estimated at the time of error correction by the FEC 134 is below a predetermined value Tc, it is determined that the reception state has deteriorated. C / N is a ratio of radio waves received by the antenna 11 to noise.

  In the determination of (I) above, the reception state is determined based on the AGC voltage. The AGC voltage is a control value when the IF AGC 135 controls the IF amplifier 131 in order to prevent the fluctuation of the electric field strength. More specifically, the IF AGC 135 is controlled by the IF AGC 135 with respect to the IF amplifier 131. Indicates the amplification factor to be set. Therefore, the IF AGC 135 may output the amplification factor to the main control unit 17 as required. Although it is not always possible to detect the deterioration of the reception state from the amplification factor of the IF AGC 135, generally, when the input electric field is high and the medium electric field is high, the output voltage (amplification factor) of the IF AGC 135 is low. In the case of a weak electric field with a low electric field, the amplification factor of the IF AGC 135 is high, so that the magnitude of the power of the received signal (that is, the electric field strength) can be estimated based on this amplification factor.

  In the determination of (II), the FEC 134 generates a signal indicating the BER, stores it in the internal memory as necessary, and outputs it to the main control unit 17 spontaneously or in response to a request. Configure it.

  In the determination of (III), the FEC 134 estimates the C / N, stores the estimation result in the internal memory as necessary, and outputs it to the main control unit 17 spontaneously or upon request. It may be configured to do so. The C / N can be estimated from, for example, the position of the inversely mapped position when the Fourier transform result is inversely mapped to the coordinate axis of the complex plane during the demodulation process in the demodulation circuit 133.

  In the above, when the remaining amount detection unit 22 detects that the remaining amount of the battery 23 has become equal to or less than the predetermined value, the tuner unit 12 determines the channel whose reception state is determined to be a certain level or higher by the main control unit 17. It is controlled to receive only EIT. This reception state can be determined based on any one or more of the AGC voltage, C / N value, and BER value.

  When executing the third reception restriction method, the main control unit 17 performs setting so that only the EIT of the program included in the time zone specified by the user is received for each channel. Specifically, the main control unit 17 receives an input of a time zone that the user wants to view (for example, from 21:00 to 24:00) through the key operation input unit 19, and stores information on this time zone in the data storage unit 18. Remember. When the remaining amount detection unit 22 detects that the remaining amount of the battery 23 is equal to or less than a predetermined value, the tuner unit 12 is included in the time zone stored in the data storage unit 18 for each channel. It is controlled to receive only the EIT of the program.

  By executing the first to third reception restriction methods described above, it is possible to restrict the reception of program information (EIT) according to the remaining capacity of the battery, thereby shortening the startup time of the tuner, Battery consumption can be suppressed.

  FIG. 3 is a flowchart for explaining an example of the program information acquisition method by the digital broadcast receiving apparatus of the present invention. Here, a case where the first reception restriction method described above is applied to the digital broadcast receiving apparatus 10 shown in FIG. 1 will be described as an example. Note that the program information in this example refers to EIT.

  First, as preprocessing, the user sets a program information reception mode in which program information is automatically received at a fixed cycle for the digital broadcast receiving apparatus 10 in a standby state (step S11), and the battery capacity is further reduced. When the number is decreased, the program information is set so as to be received only on the channels designated by the user (channels 4, 6, 8, and 10 in this example) (step S12).

  Then, the digital broadcast receiving apparatus 10 determines whether or not the program information acquisition time has come (step S13), and when the program information acquisition time has come (YES), activates the tuner unit 12 (step S13). S14). In step S13, if the program information acquisition time is not reached (NO), the process waits until the program information acquisition time in step S13.

  Next, the digital broadcast receiving apparatus 10 determines whether or not the remaining amount of the battery 23 exceeds a predetermined value (step S15), and determines that the remaining amount of the battery 23 exceeds the predetermined value (YES) (YES) ), The tuner unit 12 starts channel selection according to the channel list (step S16). For example, when all the program information for one week is acquired for the channel selected in step S16 (step S17), it is determined whether or not the program information has been acquired for all the channels in the channel list (step S18). If it is determined that the program information has been acquired for all the channels in the channel list (in the case of YES), the entire electronic program guide is rewritten based on the acquired program information (step S19), and the process returns to step S13, and the next It shifts to a standby state until the program information acquisition time. If it is determined in step S18 that the program information has not been acquired for all channels in the channel list (NO), the process returns to step S16 and the process is repeated.

  Further, when the digital broadcast receiving apparatus 10 determines in step S15 that the remaining amount of the battery 23 is equal to or less than the predetermined value (in the case of NO), the tuner unit 12 receives the channel that is set to receive in step S12 (this example) Then, any one of 4, 6, 8, 10 channels) is selected (step S20). For example, when all the program information for one week is acquired for the channel selected in step S20 (step S21), it is determined whether or not the program information has been acquired for all the reception-set channels (step S22). . Here, when it is determined that the program information has been acquired for all the channels set to be received (in the case of YES), only the channel portion received this time is rewritten in the electronic program guide, and the remaining channel portions are deleted (step S23), the process returns to step S13, and shifts to a standby state until the next program information acquisition time. If it is determined in step S22 that the program information has not been acquired for all the channels set for reception (NO), the process returns to step S20 and the process is repeated.

  FIG. 4 is a flowchart for explaining another example of the program information acquisition method by the digital broadcast receiving apparatus of the present invention. Here, a case where the second reception restriction method described above is applied to the digital broadcast receiving apparatus 10 shown in FIG. 1 will be described as an example.

  First, as preprocessing, the user sets a program information reception mode in which program information is automatically received at a fixed cycle for the digital broadcast receiving apparatus 10 in a standby state (step S31), and the battery capacity is further reduced. When the number is reduced, it is set to receive only the program information of the channel whose reception state is a certain level or higher (step S32).

  Then, the digital broadcast receiving apparatus 10 determines whether or not the program information acquisition time has come (step S33), and when the program information acquisition time has come (YES), activates the tuner unit 12 (step S33). S34). In step S33, if the program information acquisition time is not reached (NO), the process waits until the program information acquisition time in step S33.

  Next, the digital broadcast receiving apparatus 10 determines whether or not the remaining amount of the battery 23 exceeds a predetermined value (step S35), and determines that the remaining amount of the battery 23 exceeds the predetermined value (YES) (YES) ), The tuner unit 12 starts channel selection according to the channel list (step S36). For example, when all the program information for one week is acquired for the channel selected in step S36 (step S37), it is determined whether or not the program information has been acquired for all the channels in the channel list (step S38). Here, when it is determined that the program information has been acquired for all channels in the channel list (in the case of YES), the entire electronic program guide is rewritten based on the acquired program information (step S39), and the process returns to step S33, and the next It shifts to a standby state until the program information acquisition time. If it is determined in step S38 that program information has not been acquired for all channels in the channel list (NO), the process returns to step S36 and the process is repeated.

  If the digital broadcast receiving apparatus 10 determines in step S35 that the remaining amount of the battery 23 is equal to or less than the predetermined value (NO), the tuner unit 12 selects a channel according to the channel list (step S40). ). Then, for the channel selected in step S40, it is determined whether or not the reception state is above a certain level (step S41). The reception state can be determined based on any one or more of the AGC voltage, the C / N value, and the BER value as described with reference to FIG.

  If the digital broadcast receiving apparatus 10 determines in step S41 that the reception state of the selected channel is equal to or higher than a certain level (in the case of YES), for example, all program information for one week is acquired for the selected channel. (Step S42). If it is determined in step S41 that the reception state of the selected channel is less than a certain level (in the case of NO), the process returns to step S40, and the next channel is selected based on the channel list.

  Next, the digital broadcast receiving apparatus 10 determines whether or not channel selection has been completed for all channels (step S43). Here, if it is determined that the channel selection has been completed for all channels (in the case of YES), only the channel portion that has received the current program information is rewritten in the electronic program guide, and the remaining channel portions are deleted (step S44). Then, the process returns to step S33 and shifts to a standby state until the next program information acquisition time. If it is determined in step S43 that channel selection has not been completed for all channels (NO), the process returns to step S40 and the process is repeated.

  FIG. 5 is a flowchart for explaining another example of the program information acquisition method by the digital broadcast receiving apparatus of the present invention. Here, a case where the above-described third reception restriction method is applied to the digital broadcast receiving apparatus 10 shown in FIG. 1 will be described as an example.

  First, as preprocessing, the user sets a program information reception mode in which program information is automatically received at a fixed cycle for the digital broadcast receiving apparatus 10 in the standby state (step S51), and further, the battery capacity is reduced. When the number is reduced, the setting is made so that only the program information of the program included in the time zone (in this example, 21:00 to 24:00) designated by the user is received for each channel (step S52).

  Then, the digital broadcast receiving apparatus 10 determines whether or not the program information acquisition time has come (step S53), and when the program information acquisition time has come (YES), activates the tuner unit 12 (step S53). S54). In step S53, if the program information acquisition time is not reached (NO), the process waits until the program information acquisition time in step S53.

  Next, the digital broadcast receiving apparatus 10 determines whether or not the remaining amount of the battery 23 exceeds a predetermined value (step S55), and determines that the remaining amount of the battery 23 exceeds the predetermined value (YES) (YES) ), The tuner unit 12 starts channel selection according to the channel list (step S56). For example, when all the program information for one week is acquired for the channel selected in step S56 (step S57), it is determined whether or not the program information has been acquired for all the channels in the channel list (step S58). If it is determined that the program information has been acquired for all channels in the channel list (in the case of YES), the entire electronic program guide is rewritten based on the acquired program information (step S59), and the process returns to step S53. It shifts to a standby state until the program information acquisition time. If it is determined in step S58 that program information has not been acquired for all channels in the channel list (NO), the process returns to step S56 and the process is repeated.

  When the digital broadcast receiving apparatus 10 determines in step S55 that the remaining amount of the battery 23 is equal to or less than the predetermined value (in the case of NO), the tuner unit 12 selects a channel according to the channel list (step S60). ). Then, for the channel selected in step S60, the program of the program specified by the table_id and section_number in the table shown in FIG. 6 according to the time zone set for reception in step S52 (21:00 to 24:00 in this example). For example, when all the information for one week is acquired (step S61), it is determined whether or not the acquisition of the program information of the program included in the reception-set time zone has been completed for all the channels in the channel list (step S62). Here, when it is determined that the program information of the program included in the reception-set time zone has been acquired for all channels in the channel list (in the case of YES), the current program information is received for the electronic program guide Only the channel part in the time zone is rewritten, the remaining channel part is deleted (step S63), the process returns to step S53, and the process shifts to a standby state until the next program information acquisition time. If it is determined in step S62 that the program information of the program included in the reception-set time zone has not been acquired for all channels in the channel list (NO), the process returns to step S60 and the process is repeated.

  The table shown in FIG. 6 is included in the EIT, and describes the assignment of table_id and section_number of EIT [schedule basic].

  FIG. 7 is a diagram showing an example of an electronic program guide created by the digital broadcast receiving apparatus of the present invention. The main control unit 17 of the digital broadcast receiving apparatus 10 functions as an electronic program guide creation unit that creates an electronic program guide based on program information for each channel received by the tuner unit 12. In this case, when the remaining amount detection unit 22 detects that the remaining amount of the battery 23 has become equal to or less than a predetermined value, the main control unit 17 performs the above-described first to third for the electronic program guide. Only the received program information is rewritten based on the reception restriction method, and other program information other than the program information is deleted, so that only new program information is displayed, making it easier to view the necessary information in the electronic program guide. it can.

  FIG. 7A partially shows a conventional electronic program guide, with time on the vertical axis and channels on the horizontal axis. When the first reception restriction method is applied to the electronic program guide shown in FIG. 7A, only the program information of the channel designated by the user is rewritten, and the program information of the other channels is deleted. Is done. In the example of FIG. 7B, since channels other than “NKK general” and “NKK education” are designated to be received, the program information of these “NKK general” and “NKK education” is deleted, and the other information Channel program information is updated.

  In addition, when the second reception restriction method described above is applied to the electronic program guide shown in FIG. 7A, only the program information of channels whose reception status is higher than a certain level is rewritten, and other channel information is changed. Program information is deleted. In the example of FIG. 7B, since the reception status of “NKK general” and “NKK education” is less than a certain level, the program information of these “NKK general” and “NKK education” is deleted, and the other information Channel program information is updated.

  When the third reception restriction method described above is applied to the electronic program guide shown in FIG. 7A, only the program information of the program included in the time zone designated by the user is rewritten for each channel. Then, the program information of the program included in the time zone other than the designated time zone is deleted. In the example of FIG. 7C, “19:00 to 21:00” is specified as the time zone by the user for each channel (“NKK general”, “NKK education”, “Nichi-Nihon TV”, “TV sunset”). Therefore, only program information of programs included in this time zone is updated, and program information of programs included in other time zones is deleted.

It is a block diagram which shows the structural example of the digital broadcast receiver which concerns on one Embodiment of this invention. It is a block diagram which shows the detailed structural example of the tuner part with which the digital broadcast receiver of this invention is provided, and a demodulation process part. It is a flowchart for demonstrating an example of the program information acquisition method by the digital broadcast receiver of this invention. It is a flowchart for demonstrating the other example of the program information acquisition method by the digital broadcast receiver of this invention. It is a flowchart for demonstrating the other example of the program information acquisition method by the digital broadcast receiver of this invention. It is a figure which shows the table which described allocation of table_id and section_number of EIT [schedule basic]. It is a figure which shows an example of the electronic program guide produced with the digital broadcast receiver of this invention. It is a flowchart for demonstrating an example of the EIT acquisition procedure by a general fixed receiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Digital broadcast receiver, 11 ... Antenna, 12 ... Tuner part, 13 ... Demodulation processing part, 14 ... TSDEMUX, 15 ... Video decoding part, 16 ... Audio decoding part, 17 ... Main control part, 18 ... Data storage part, DESCRIPTION OF SYMBOLS 19 ... Key operation input part, 20 ... Display part, 21 ... Speaker, 22 ... Remaining amount detection part, 23 ... Battery, 121 ... Preamplifier, 122 ... BPF, 123 ... VGA, 124 ... Mixer, 125 ... OSC, 126 ... BPF DESCRIPTION OF SYMBOLS 127 ... IF amplifier, 128 ... Level detection circuit, 129 ... Voltage control amplifier, 131 ... IF amplifier, 132 ... A / D, 133 ... Demodulation circuit, 134 ... FEC, 135 ... AGC for IF

Claims (6)

A digital broadcast receiver having a battery for supplying power,
Program information receiving means for receiving program information for each channel, reception restriction setting means for setting reception restrictions on program information received by the program information receiving means, and remaining amount detection means for detecting the remaining amount of the battery And
When it is detected by the remaining amount detecting means that the remaining amount of the battery is equal to or less than a predetermined value, the program information receiving means is configured to receive program information based on the reception restriction set by the reception restriction setting means. The digital broadcast receiving apparatus is characterized by restricting reception of the broadcast.   2. The digital broadcast receiving apparatus according to claim 1, wherein the reception restriction setting means is a remaining channel obtained by removing unnecessary channels from a channel list of a region designated by a user or a plurality of channels receivable in the region. The digital broadcast receiving apparatus is set so as to receive the program information. The digital broadcast receiving apparatus according to claim 1, further comprising a determination unit that determines a reception state of the channel based on an index indicating a reception state of the channel received by the digital broadcast reception device.
The digital broadcast receiving apparatus, wherein the reception restriction setting means is set to receive only program information of a channel whose reception state is determined to be a certain level or more by the determination means.   4. The digital broadcast receiving apparatus according to claim 3, wherein the index indicating the reception state is one or more of an AGC voltage, a C / N value, and a BER value.   2. The digital broadcast receiving apparatus according to claim 1, wherein the reception restriction setting means is set to receive only program information of programs included in a time zone designated by the user for each channel. A digital broadcast receiver. The digital broadcast receiving apparatus according to any one of claims 1 to 5, further comprising an electronic program guide creating means for creating an electronic program guide based on program information for each channel received by the program information receiving means,
When it is detected by the remaining amount detecting means that the remaining amount of the battery is equal to or less than a predetermined value, the electronic program guide creating means is configured to limit reception by the reception restriction setting means for the electronic program guide. A digital broadcast receiving apparatus, wherein only the program information received based on the program information is rewritten and other program information other than the program information is deleted.

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