JP5371632B2 - Digital broadcast receiving apparatus and digital broadcast receiving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiving unit and method, shortening a time needed for scanning for updating channel information of a channel information storing part without adding hardware. <P>SOLUTION: When updating the channel information of the channel information storing part, whether a physical channel is stored in the channel information storing part is determined. A stream processing part extracts at least either program specific information or program arrangement information about a physical channel that is not stored in the channel information storing part, and the channel information of the channel information storing part is updated on the basis of the extracted information. The stream processing part does not perform extraction processing of a physical channel stored in the channel information storing part. Consequently, a time needed for scanning for updating the channel information of the channel information storing part is shortened. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus and a digital broadcast receiving method, and more particularly to a digital broadcast receiving apparatus and a digital broadcast receiving method mounted on a mobile body such as a vehicle or a mobile terminal device.

  The digital broadcast receiving apparatus determines whether or not the digital broadcast can be received for all physical channels to which the digital broadcast may be transmitted, and selects the digital broadcast if the digital broadcast can be received. Necessary parameters (hereinafter referred to as “channel information”) are acquired, and the information is stored in the storage unit. Processing for acquiring channel information in this way is referred to as “scanning”. When receiving a channel selection instruction from the user, the digital broadcast receiver selects a digital broadcast based on the stored channel information.

  In the case of a digital broadcast receiver mounted on a mobile object, the reception status may change due to movement, and it may not be possible to receive a digital broadcast that has been received until then. May be received. In such a case, it is necessary to perform scanning again, acquire channel information of digital broadcasts that can be received again, and update channel information stored in the storage unit. However, it takes a long time to scan all physical channels.

  In particular, in the case of a digital broadcast receiving apparatus in which the number of digital broadcasts that can be simultaneously received is one, the user cannot view the digital broadcast while the scan is being performed. When the time becomes longer, the time during which the user cannot view the digital broadcast also becomes longer. Further, if the time required for executing the scan becomes longer, the addition of digital broadcast channel information that can be received and the deletion of digital broadcast channel information that cannot be received may be delayed.

  As a technique for shortening the time required for executing the scan, a technique is proposed in which the scan is executed only for the physical channel whose reception intensity is equal to or higher than a threshold (see, for example, Patent Document 1).

  In Patent Document 1, two tuners are installed, the reception strength of all physical channels is detected by one tuner, a list of physical channels whose reception strength is equal to or greater than a threshold is created, and the list created last time and this time created There is disclosed a digital terrestrial broadcast receiver that does not perform scanning when the lists match, and uses the other tuner when the lists do not match, and scans only the physical channels that are present in the list that was created this time. Yes.

Japanese Patent Laying-Open No. 2006-13945 (FIG. 3)

  However, in the terrestrial digital broadcast receiver disclosed in Patent Document 1, it is necessary to provide a tuner for detecting the reception intensity of the physical channel, in addition to the tuner for performing channel selection and scanning.

  In addition, when there is a change in the list of physical channels whose reception strength is greater than or equal to the threshold, scanning is performed on all physical channels whose reception strength is greater than or equal to the threshold. Scanning is also performed on other physical channels that continue, and the time required for scanning increases.

  In addition, due to the time lag between the detection of the reception intensity and the execution of the scan, the reception intensity may be weakened when the scan is executed. In such a case, channel information cannot be acquired, and as a result, the time required for scanning becomes longer.

  The present invention has been made in order to solve the above-described problems, and is a digital broadcast receiver capable of reducing the time required for scanning for updating channel information in a channel information storage unit without adding hardware. It is another object of the present invention to provide a digital broadcast receiving method.

A digital broadcast receiving apparatus according to the present invention,
A tuner unit that selects a physical channel and acquires a digital broadcast stream transmitted on the selected physical channel;
The program identification information and program arrangement information included in the digital broadcast stream acquired by the tuner unit are extracted, the video stream and the audio stream included in the digital broadcast stream acquired by the tuner unit are decoded, and the video signal and A stream processing unit for obtaining an audio signal;
A video / audio output unit that outputs a video signal and an audio signal acquired from the stream processing unit;
A channel information storage unit for storing channel information necessary for selecting a digital broadcast;
Instructing the tuner unit on a physical channel to be selected, instructing the stream processing unit on program identification information and program arrangement information to be extracted, obtaining channel information from the channel information storage unit, A channel selection control unit for updating channel information in the channel information storage unit;
A physical channel storage determination unit that determines whether or not a physical channel is stored in the channel information storage unit,
The tuner unit notifies the channel selection control unit of the reception strength of the selected physical channel,
The tuning control unit stores a history of reception strength when a physical channel is selected by the tuner unit, calculates a reception strength score from the history of reception strength,
The tuning control unit is
For a physical channel that is determined not to be stored in the channel information storage unit by the physical channel storage determination unit and that has a reception strength score that satisfies a predetermined condition, the physical channel is selected by the tuner unit The channel processing unit updates the channel information in the channel information storage unit based on the extracted information by performing an extraction process for extracting at least one of program identification information and program arrangement information by the stream processing unit, and the physical channel storage determination unit For the physical channel determined to be stored in the channel information storage unit and the physical channel for which the reception strength score does not satisfy the predetermined condition, the extraction processing by the stream processing unit is not performed. .

  According to the digital broadcast receiving apparatus of the present invention, when performing a scan for updating the channel information in the channel information storage unit, the physical channel already stored in the channel information storage unit is extracted by the stream processing unit. Since this is not performed, the time required for scanning can be reduced.

It is a block diagram which shows the structure of the digital broadcast receiver in Embodiment 1 of this invention. It is a figure which shows an example of the data format of the channel information storage part 107 of the digital broadcast receiver in Embodiment 1 of this invention. It is a flowchart which shows the whole process which the channel selection control part 106 of the digital broadcast receiver in Embodiment 1 of this invention performs. It is a flowchart which shows the channel selection process which the channel selection control part 106 of the digital broadcast receiver in Embodiment 1 of this invention performs. It is a flowchart which shows the channel selection stop process which the channel selection control part 106 of the digital broadcast receiver in Embodiment 1 of this invention performs. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 1 of this invention performs. It is a block diagram which shows the structure of the digital broadcast receiver in Embodiment 2 of this invention. It is a figure which shows an example of the data format of the reception intensity memory | storage part 108 of the digital broadcast receiver in Embodiment 2 of this invention. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 2 of this invention performs. 10 is a flowchart illustrating a specific example of processing in steps S905 and S906 in FIG. 9. It is a flowchart which shows the process in which the channel selection control part 106 of the digital broadcast receiver in Embodiment 3 of this invention acquires the list | wrist of a physical channel. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 4 of this invention performs. It is a figure which shows an example of the data format of the channel information storage part 107 of the digital broadcast receiver in Embodiment 5 of this invention. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 5 of this invention performs. It is the block diagram (A) which shows the structure of the digital broadcast receiver in Embodiment 6 of this invention, and the figure (B) which shows an example of the data format of the positional information storage part 110. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 6 of this invention performs. It is a figure which shows an example of the data format of the positional information storage part 110 of the digital broadcast receiver in Embodiment 7 of this invention. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 7 of this invention performs. It is the block diagram (A) which shows the structure of the digital broadcast receiver in Embodiment 8 of this invention, and the figure (B) which shows an example of the data format of the mileage storage part 112. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 8 of this invention performs. It is a figure which shows an example of the data format of the mileage storage part 112 of the digital broadcast receiver in Embodiment 9 of this invention. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 9 of this invention performs. It is a block diagram (A) which shows the structure of the digital broadcast receiver in Embodiment 10 of this invention, and a figure (B) which shows an example of the data format of the time memory | storage part 114. FIG. It is a flowchart which shows the process of the scan which the channel selection control part 106 of the digital broadcast receiver in Embodiment 10 of this invention performs. It is a figure which shows an example of the data format of the time memory | storage part 114 of the digital broadcast receiver in Embodiment 11 of this invention. It is a flowchart which shows the scanning process which the channel selection control part 106 of the digital broadcast receiver in Embodiment 11 of this invention performs. It is a block diagram which shows the structure of the digital broadcast receiver in Embodiment 12 of this invention. It is a flowchart which shows the process which the channel selection control part 106 of the digital broadcast receiver in Embodiment 12 of this invention performs with respect to the 1st system | strain 118 and the common part 119. It is a flowchart which shows the process which the channel selection control part 106 of the digital broadcast receiver in Embodiment 12 of this invention performs with respect to the common part 119 and the 2nd system | strain 120. FIG.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to Embodiment 1 of the present invention. The digital broadcast receiving apparatus according to the first embodiment includes an antenna unit 101, a tuner unit 102, a stream processing unit 103, a video / audio output unit 104, a user instruction receiving unit 105, a channel selection control unit 106, and channel information. The storage unit 107 and the nonvolatile memory 100 are provided.

  The antenna unit 101 can receive a digital broadcast signal transmitted from a broadcast station. A digital broadcast signal received by the antenna unit 101 is input to the tuner unit 102.

  The tuner unit 102 extracts a signal of a specific physical channel from the digital broadcast signal input from the antenna unit 101, performs demodulation and error correction of the signal, and generates a transport stream (TS) as a stream processing unit 103. Output to. The channel selection control unit 106 (to be described later) controls which physical channel signal of the digital broadcast signal supplied from the antenna unit 101 is extracted by the tuner unit 102.

  The tuner unit 102 also receives reception intensity information indicating the reception intensity of the physical channel extracted from the digital broadcast signal, reception C / N ratio (Carrier to Noise ratio) information, PLL (Phase Locked Loop) lock information, and frame lock information. , And at least one of various information of the error rate information is output and notified to the tuning control unit 106.

  The stream processing unit 103 extracts program specific information (Program Specific Information: PSI) and program arrangement information (Service Information: Service Information: SI) from the TS input from the tuner unit 102, and selects the extracted PSI and SI. Notify the station control unit 106. Which PSI and SI are extracted from the PSI and SI included in the TS input from the tuner unit 102 by the stream processing unit 103 is controlled by the channel selection control unit 106 described later.

  The stream processing unit 103 also extracts video and audio streams from the TS input from the tuner unit 102, decodes the video and audio streams, and outputs the decoded video and audio signals to the video and audio output unit 104. Output to. Which video and audio streams are decoded among the video and audio streams included in the TS input from the tuner unit 102 by the stream processing unit 103 is controlled by the channel selection control unit 106 described later. The stream processing unit 103 has a configuration in which, for example, a demultiplexing unit and a video / audio decoding unit are combined.

  The video / audio output unit 104 outputs video and audio based on the video signal and audio signal input from the stream processing unit 103. The audio / video output unit 104 can also display a GUI (Graphic User Interface). Whether the video / audio output unit 104 outputs video and audio and whether to output a GUI are controlled by the channel selection control unit 106 described later.

  The user instruction receiving unit 105 receives an instruction from the user and notifies the channel selection control unit 106 described later.

  The channel selection control unit 106 receives a user instruction notified from the user instruction receiving unit 105. Further, the channel selection control unit 106 instructs a physical channel to be selected by the tuner unit 102, and receives various kinds of reception intensity information, reception C / N ratio information, PLL lock information, frame lock information, and error rate information from the tuner unit 102. At least one of the information is received. Further, the channel selection control unit 106 instructs the stream processing unit 103 which PSI and SI should be extracted, and acquires the extracted PSI and SI from the stream processing unit 103.

  Further, the channel selection control unit 106 instructs a video stream and an audio stream to be decoded by the stream processing unit 103. Further, the channel selection control unit 106 instructs whether the video / audio output unit 104 outputs video, whether to output audio, and whether to display a GUI. The channel selection control unit 106 acquires channel information from a channel information storage unit 107 described later. Further, the channel selection control unit 106 updates channel information in a channel information storage unit 107 described later.

  The channel information storage unit 107 stores channel information necessary for selecting a digital broadcast. An example of the data format of the channel information storage unit 107 is shown in FIG. The channel information storage unit 107 stores, for example, a physical channel and a service ID as channel information. Also, network_id, original_network_id, TS_ID, TS name, service name, etc. may be held as information other than physical channel information and service ID.

  The nonvolatile memory 100 stores a list of physical channels on which digital broadcasting is operated. For example, in the case of a Japanese digital terrestrial broadcast (ISDB-T) receiver, 50 physical channels of 13 ch to 62 ch are stored. In the case of a European terrestrial digital broadcast (DVB-T) receiver, 62 physical channels of 1ch to 13ch and 21ch to 69ch are stored.

  The nonvolatile memory 100 stores the list of physical channels described above when the digital broadcast receiver 1 is shipped from the factory.

  FIG. 3 is a flowchart showing processing executed by the channel selection control unit 106 of the digital broadcast receiving device 1 according to Embodiment 1 of the present invention. The channel selection control unit 106 starts the process shown in the flowchart of FIG. 3 when the power of the digital broadcast receiving apparatus is turned on (Start).

  The channel selection control unit 106 first performs a channel selection process (S301). Here, output of video and audio is started (or a GUI is displayed) for the digital broadcast that has been viewed until the power is turned off. The specific contents of the channel selection process will be described with reference to the flowchart of FIG.

  Subsequently, the channel selection control unit 106 waits for an instruction (channel selection or scan) from the user instruction receiving unit 105 (S302).

  If there is an instruction from the user in step S302, the channel selection control unit 106 determines whether the type of instruction from the user is “channel selection” or “scan” (S303).

  If the user instruction is “channel selection” in step S303, the channel selection control unit 106 performs channel selection stop processing, that is, processing for stopping video and audio output (or GUI display) (step S303). S304). The specific contents of the channel selection stop process will be described with reference to the flowchart of FIG.

  After the tuning stop process (S304) is completed, the tuning control unit 106 performs a tuning process (S305). Here, output of video and audio is started for the digital broadcast selected by the user in step S302. The specific contents of the channel selection process will be described with reference to the flowchart of FIG.

  On the other hand, if the user instruction is “scan” in the above-described step 303, the channel selection control unit 106 performs a channel selection stop process (S306).

  Subsequently, the channel selection control unit 106 causes the video / audio output unit 104 to display a GUI indicating that the scan is being executed (S307).

  After the channel selection stop process (S307) is completed, the channel selection control unit 106 performs a scan for updating the channel information in the channel information storage unit (S308). The specific contents of the scan will be described with reference to the flowchart of FIG.

  After completing the scan (S308), the channel selection control unit 106 deletes the GUI indicating that the scan is being executed from the video / audio output unit 105 (S309).

  Subsequently, the channel selection control unit 106 performs a channel selection process (S310). Here, one piece of channel information is selected from the channel information storage unit updated by scanning, and output of digital broadcast video and audio of the channel information is started. Here, the channel information to be selected is, for example, channel information stored at the head of the channel information storage unit. Thereafter, the process proceeds to step S302 and waits for an instruction from the user instruction receiving unit 105.

  FIG. 4 is a flowchart showing channel selection processing (steps S301, S305, and S310 in FIG. 3) executed by the channel selection control unit 106 of the digital broadcast receiving apparatus 1 according to Embodiment 1 of the present invention. First, the channel selection control unit 106 acquires channel information (see FIG. 2) of the digital broadcast to be selected from the channel information storage unit 107 (S401).

  Subsequently, the channel selection control unit 106 notifies the tuner unit 102 of the physical channel of the channel information acquired in step S301, and the tuner unit 102 extracts the signal of the physical channel and outputs the TS to the stream processing unit 103. (S402).

  Subsequently, the channel selection control unit 106 instructs the stream control unit 103 to extract a program association table (PAT) from the TS input from the tuner unit 102 (S403).

  Subsequently, the channel selection control unit 106 determines whether or not the PAT has been acquired within a predetermined time after starting the extraction of the PAT in step S403 (S404). If the PAT cannot be acquired within a predetermined time in step S404 (No in S404), the process proceeds to step S412 described later.

  If the PAT can be acquired within a certain time in step S404 (Yes in S404), the channel selection control unit 106 determines whether the acquired PAT includes the service ID of the channel information acquired in step S401. Judging. If the service ID is not included in the PAT (No in S405), the process proceeds to step S412 described later.

  If the service ID is included in the PAT in step S405 (Yes in S405), the channel selection control unit 106 selects a program correspondence table (Program Map Table) corresponding to the service ID of the channel information acquired in step S401. PMT) is acquired from the PAT acquired in step S405.

  Subsequently, the channel selection control unit 106 instructs the stream control unit 103 to start extracting the PMT based on the PID of the PMT acquired in step S406 (S407).

  Subsequently, the channel selection control unit 106 determines whether or not the PMT has been acquired within a certain time after starting the extraction of the PMT in step S407 (S408). If the PMT cannot be acquired within a certain time (No in S408), the process proceeds to step S412 described later.

  If the PMT can be acquired within a predetermined time in step S408 (Yes in S408), the channel selection control unit 106 acquires the video and audio PID from the acquired PMT (S409).

  Subsequently, the channel selection control unit 106 instructs the stream control unit 103 to decode the video and audio based on the video and audio PID acquired in step S409 (S410).

  Subsequently, the channel selection control unit 106 instructs the video / audio output unit 105 to start outputting the video and audio decoded by the stream processing unit 103 (S411), and ends the processing (that is, FIG. In step S302 of step 3, the user instruction is waited).

  On the other hand, if the PAT could not be extracted in step S404 described above (No in S404), if the service ID was not included in the PAT in step S405 (No in S405), or if the PMT could not be extracted in S408 In (No in S408), the channel selection control unit 106 instructs the video / audio output unit 105 to display a GUI indicating that reception is not possible (S412), and ends the process.

  FIG. 5 is a flowchart showing channel selection stop processing (steps S304 and S306 in FIG. 3) executed by the channel selection control unit 106 of the digital broadcast receiving apparatus 1 according to Embodiment 1 of the present invention. The channel selection control unit 106 first instructs the video / audio output unit 105 to delete the GUI indicating that reception is not possible (S501).

  Subsequently, the channel selection control unit 106 instructs the video / audio output unit 105 to stop the output of video and audio (S502).

  Subsequently, the channel selection control unit 106 instructs the stream processing unit 103 to stop decoding of video and audio (S503).

  Finally, the channel selection control unit 106 instructs the stream processing unit 103 to stop the extraction of the PAT and PMT, and ends the process (S504).

  FIG. 6 is a flowchart showing a scan (step S308 in FIG. 3) executed by the channel selection control unit 106 of the digital broadcast receiving apparatus 1 according to Embodiment 1 of the present invention. The channel selection control unit 106 first acquires a list of physical channels on which scanning is performed from the nonvolatile memory 100 (S601). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S601 (S602).

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S603).

  Subsequently, the channel selection control unit 106 acquires the reception intensity from the tuner unit 102, and compares the acquired reception intensity with a threshold value (S604). If the reception intensity is less than the threshold (No in S604), the process proceeds to step S611 described later.

  If the reception strength is greater than or equal to the threshold value in step S604 (Yes in S604), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107. Judgment is made (S605). If channel information including the selected physical channel is stored in the channel information storage unit 107 (Yes in S605), the process proceeds to step S611 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S605 (No in S605), the channel selection control unit 106 sends at least one of PSI and SI to the stream processing unit 103. Extraction (hereinafter referred to as PSI / SI) is started (S606).

  Subsequently, the channel selection control unit 106 determines whether or not SI has been acquired within a predetermined time after starting extraction of PSI / SI in step S606 (S607). If the PSI / SI cannot be acquired within a certain time (No in S607), the process proceeds to step S610 described later.

  If PSI / SI can be acquired within a predetermined time in step S607 (Yes in S607), the channel selection control unit 106 generates channel information (S608). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. If channel_information, network_id, original_network_id, TS_ID, TS name, service name, etc. are stored as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S608 to the channel information storage unit 107 (S609). At this time, if channel information whose physical channel matches the channel information acquired in step S608 already exists in the channel information storage unit 107, the channel information acquired in step S608 is overwritten with the channel information corresponding to the physical channel. save.

  After adding channel information in step S609 or when PSI / SI cannot be acquired in step S607 (No in S607), the channel selection control unit 106 stops the PSI / SI extraction in the stream processing unit 103. (S610).

  After the PSI / SI extraction is stopped in step S610, or when the reception intensity is less than the threshold value in step S604 (No in S604), or channel information including the physical channel is stored in the channel information storage unit 107 in step S605. If it has been determined (Yes in S605), the channel selection control unit 106 determines whether all physical channels in the physical channel list acquired in Step S601 have been selected (S611). If all the physical channels have been selected (Yes in S611), the process ends.

  When all the physical channels are not selected in step S611 (No in S611), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S601. A physical channel is selected (S612), and the process proceeds to step S603 described above.

  As described above, the digital broadcast receiving apparatus according to the first embodiment does not always acquire PSI / SI when the reception intensity is equal to or higher than the threshold, but the channel information storage unit 107 has a reception intensity equal to or higher than the threshold and the physical channel. If not stored in PSI / SI, the PSI / SI is acquired (steps S604 to S606 in FIG. 6). Therefore, the time required for scanning can be shortened as compared with the case where PSI / SI is always acquired when the reception intensity is equal to or higher than the threshold. Moreover, it is not necessary to add hardware such as a tuner unit as in the prior art (see Patent Document 1).

Embodiment 2. FIG.
Next, a digital broadcast receiving apparatus according to Embodiment 2 of the present invention will be described. FIG. 7 is a block diagram showing a configuration of the digital broadcast receiving apparatus according to the second embodiment. The digital broadcast receiving apparatus according to the second embodiment includes a reception intensity storage unit 108 in addition to the blocks constituting the digital broadcast receiving apparatus according to the first embodiment.

  The reception intensity storage unit 108 stores reception intensity when a physical channel is selected for each physical channel. An example of the data format stored in the reception intensity storage unit 108 is shown in FIG. In the example illustrated in FIG. 8, the reception strength storage unit 108 stores the current reception strength, the previous reception strength, and the reception strength two times before. Alternatively, the current reception strength and the previous reception strength may be stored, or only the current reception strength may be stored. Moreover, you may make it memorize | store the received intensity before before twice.

  The channel selection control unit 106 acquires the reception intensity from the reception intensity storage unit 108. Further, the channel selection control unit 106 updates the reception strength of the reception strength storage unit 108.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the second embodiment is substantially the same as that of the channel selection control unit of the digital broadcast receiving apparatus according to the first embodiment described above. Is different from the scan shown in

  FIG. 9 is a flowchart showing scan processing performed by the channel selection control unit 106 of the digital broadcast receiving apparatus according to Embodiment 2 of the present invention. The channel selection control unit 106 acquires, from the nonvolatile memory 100, a list of physical channels that execute scanning (S901). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Next, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S901 (S902).

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S903).

  Subsequently, the channel selection control unit 106 updates the reception strength in the currently selected physical channel column of the reception strength storage unit 108 (S904). In the example shown in FIG. 8, first, the value written in the previous reception strength column is written in the reception strength column two times before, and then the current reception strength is written in the previous reception strength column. The value written in the column of “1” is written, and then the value of the reception strength acquired from the tuner unit 102 is written in the column of the current reception strength. If the reception strength prior to the previous two times is stored, the reception strength is listed in the (N + 1) th previous reception strength column, in order of the oldest reception strength column. The received strength value is updated by writing the new value.

  Subsequently, the channel selection control unit 106 calculates a reception strength score from the reception strength in the currently selected physical channel column of the reception strength storage unit 108 (S905). Here, a plurality of reception strength scores may be calculated.

  Subsequently, the channel selection control unit 106 determines whether or not the reception intensity score calculated in step S905 satisfies a predetermined condition (S906). The predetermined condition is, for example, whether or not the reception strength score is equal to or greater than a threshold value.

  An example of the processing of step S905 and step S906 is shown in FIG. In the example shown in FIG. 10, in step S905, the reception strength score is calculated by adding the current reception strength, the previous reception strength, and the reception strength two times before. In step S906, it is determined as a “predetermined condition” whether or not the reception strength score is equal to or greater than a threshold value. If the predetermined condition is not satisfied (No in S906), the process proceeds to Step S913 described later.

  When the reception strength score satisfies the predetermined condition in step S906 (Yes in S906), the channel selection control unit 106 determines whether or not channel information including the selected physical channel is stored in the channel information storage unit 107. Judgment is made (S907). If channel information including the selected physical channel is stored in the channel information storage unit 107 (Yes in S907), the process proceeds to step S913 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S907 (No in S907), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI and SI is started (S908).

  Subsequently, the channel selection control unit 106 determines whether or not the PSI / SI has been acquired within a predetermined time after starting the extraction of the PSI / SI in step S908 (S909). If PSI / SI could not be acquired (No in S909), the process proceeds to step S912 described later.

  When PSI / SI can be acquired in step S909 (Yes in S909), the channel selection control unit 106 generates channel information (S910). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S910 to the channel information storage unit 107 (S911). At this time, if channel information whose physical channel matches the channel information acquired in step S910 exists in the channel information storage unit 107, the channel information acquired in step S910 is overwritten and saved on the channel information corresponding to the physical channel. To do.

  After adding channel information at step S911 or when PSI / SI could not be acquired at step S909 (No at S909), the channel selection control unit 106 extracts PSI / SI to the stream processing unit 103. Stop (S912).

  After the PSI / SI extraction is stopped in step S912, or when the reception strength score does not satisfy a predetermined condition in step S906 (No in S906), or in step S907, channel information including the physical channel is stored as channel information. If stored in the unit 107 (Yes in S907), the channel selection control unit 106 determines whether all physical channels in the physical channel list acquired in Step S901 have been selected (S913). If all physical channels have been selected, the process ends.

  When all the physical channels are not selected in step S913 (No in S913), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S901. A physical channel is selected (S914), and the process proceeds to step S903 described above.

  In the digital broadcast receiving apparatus of the second embodiment, a reception strength score is calculated from a history of reception strength (for example, a linear sum of the current reception strength, the previous reception strength, and the reception strength two times before) (step in FIG. 9). S905) PSI / SI is extracted when the reception strength score satisfies a predetermined condition (for example, a threshold value or more), and PSI / SI is not extracted when the reception strength score does not satisfy the predetermined value (for example, less than the threshold value) (S906). . By doing this, it is possible to extract PSI / SI only when the reception strength is temporarily increased, and to extract PSI / SI when the reception strength continues to be strong. If the current reception strength is the reception strength score in step S905, PSI / SI is extracted when the reception strength score (current reception strength) is greater than or equal to the threshold, and when the reception strength score is less than the threshold. The PSI / SI extraction is not performed, and the same operation as that of the digital broadcast receiving apparatus of the first embodiment is performed. As described above, according to the digital broadcast receiving apparatus of the second embodiment, the detailed determination as to whether or not to extract the PSI / SI is more complicated than the digital broadcast receiving apparatus of the first embodiment. It is possible to cope with various controls.

Embodiment 3 FIG.
Next, a digital broadcast receiving apparatus according to Embodiment 3 of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the third embodiment is the same as the configuration of the digital broadcast receiving apparatus according to the second embodiment (FIG. 7). The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the third embodiment is substantially the same as that of the digital broadcast receiving apparatus according to the second embodiment described above, but the process of step S901 in the scan of FIG. Only the list of physical channels is obtained).

  In the above-described digital broadcast receiving apparatus according to the second embodiment, the physical channel list acquired in step S901 (FIG. 9) includes all the physical channels that may transmit digital broadcasts one by one. It was. In contrast, in the digital broadcast receiving apparatus according to the third embodiment, in step S901, the physical channels to be included in the physical channel list are determined based on the reception intensity stored in the reception intensity storage unit 108.

  FIG. 11 shows an example of the process in step S901 (FIG. 9) of the digital broadcast receiving apparatus according to the third embodiment. The channel selection control unit 106 first includes all the physical channels that may be able to receive digital broadcasts one by one in the physical channel list (S1101).

  Subsequently, the channel selection control unit 106 acquires the current reception strength and the previous reception strength of all physical channels from the reception strength storage unit 108 (S1102).

  Subsequently, the channel selection control unit 106 calculates the difference between the previous reception strength and the current reception strength for all physical channels, and adds a physical channel whose difference is equal to or greater than the threshold to the list of physical channels (S1103). ). For example, in the example shown in FIG. 8, two physical channels “17” having a large difference between the previous reception strength and the current reception strength are included in the list of physical channels. As a result, in steps S902 to S914 shown in FIG. 9, PSI / SI is extracted twice for a physical channel (for example, physical channel 17) whose reception intensity difference is equal to or greater than a threshold value, and for other physical channels. , PSI / SI is extracted only once.

  As described above, in the digital broadcast receiving apparatus according to the third embodiment, the frequency of extracting PSI / SI can be increased for a physical channel whose reception intensity frequently changes (step S1103 in FIG. 11). In the case of a physical channel whose reception intensity frequently changes, there is a possibility that PSI / SI cannot be acquired by extracting PSI / SI once. However, by increasing the frequency of extracting PSI / SI, PSI / SI can be acquired. The possibility that SI can be acquired can be increased. As described above, the digital broadcast receiving apparatus according to the third embodiment can acquire the channel information of the digital broadcast whose reception intensity is changed earlier than the digital broadcast receiving apparatus according to the second embodiment.

Embodiment 4 FIG.
Next, a digital broadcast receiving apparatus according to Embodiment 4 of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the fourth embodiment is the same as that of the digital broadcast receiving apparatus 1 according to the first embodiment (FIG. 1). The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the present embodiment is substantially the same as the operation (FIGS. 3 to 6) of the digital broadcast receiving apparatus 1 according to the first embodiment described above. The processing procedure is different.

  FIG. 12 is a flowchart illustrating a scan process executed by the channel selection control unit 106 of the digital broadcast receiving apparatus according to the fourth embodiment. The channel selection control unit 106 first acquires a list of physical channels on which scanning is performed from the nonvolatile memory 100 (S1001). The physical channel list includes all the physical channels that may transmit digital broadcasts one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S1001 (S1002).

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S1003).

  Subsequently, the channel selection control unit 106 acquires the reception strength from the tuner unit 102, and compares the reception strength with a threshold (S1004). If the reception intensity is less than the threshold (No in S1004), the process proceeds to step S1012 described later.

  If the reception strength is greater than or equal to the threshold value in step S1004 (Yes in S1004), the channel selection control unit 106 determines whether the tuner unit 102 has detected a frame lock (S1005). If no frame lock is detected (No in S1005), the process proceeds to step S1012 described later.

  When frame lock is detected in step S1005 (Yes in S1005), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1006). ). If channel information including the selected physical channel is stored in the channel information storage unit 107 (Yes in S1006), the process proceeds to step S1007 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S1006 (No in S1006), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI or SI is started (S1007).

  Subsequently, the channel selection control unit 106 determines whether or not the PSI / SI has been acquired within a certain time after starting the extraction of the PSI / SI in step S1007 (S1008). If PSI / SI could not be acquired (No in S1008), the process proceeds to step S1011 described later.

  When PSI / SI can be acquired in step S1008 (Yes in S1008), the channel selection control unit 106 generates channel information (S1009). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S1009 to the channel information storage unit 107 (S1010). At this time, if channel information whose physical channel matches the channel information acquired in step S1009 exists in the channel information storage unit 107, the channel information acquired in step S1009 is overwritten and saved on the channel information corresponding to the physical channel. To do.

  After adding channel information in step S1010 or when PSI / SI cannot be extracted in step S1008 (No in S1008), the channel selection control unit 106 extracts PSI / SI to the stream processing unit 103. Stop (S1011).

  After the extraction of PSI / SI is stopped in step S1011, or when the reception strength is less than the threshold value in step S1004 (No in S1004), when frame lock is not detected in Step S1005 (No in S1005) or If channel information including the physical channel is stored in the channel information storage unit 107 in step S1006 (Yes in S1006), the channel selection control unit 106 selects all physical channels in the physical channel list acquired in step S1001. It is determined whether or not is selected (S1012). If all physical channels have been selected (Yes in S1012), the process ends.

  If all the physical channels are not selected in step S1012, (No in S1012), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S1001. A physical channel is selected (S1013), and the process proceeds to step S1003 described above.

  In the digital broadcast receiving apparatus according to the first embodiment described above, the PSI / SI extraction is started when the reception intensity is equal to or higher than the threshold value and the physical channel is not stored in the channel information storage unit 107. Therefore, the extraction of PSI / SI has started even when the reception intensity is greater than or equal to the threshold value due to factors other than digital broadcasting (for example, analog broadcasting) and the physical channel is not stored in the channel information storage unit 107. . In this case, since PSI / SI cannot be acquired even if PSI / SI is extracted on a physical channel to which no digital broadcast is transmitted, the time required for scanning becomes longer. On the other hand, since the digital broadcast receiving apparatus according to the fourth embodiment does not acquire PSI / SI unless the frame is locked (step S1005 in FIG. 12), the reception intensity exceeds the threshold value due to factors other than digital broadcasting. If it is, PSI / SI is not extracted. As described above, the digital broadcast receiving apparatus according to the fourth embodiment can shorten the time required for scanning as compared with the digital broadcast receiving apparatus according to the first embodiment.

Embodiment 5 FIG.
Next, a digital broadcast receiving apparatus according to Embodiment 5 of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the fifth embodiment is the same as the configuration of the digital broadcast receiving apparatus according to the fourth embodiment described above.

  FIG. 13 is a diagram illustrating an example of a data format of the channel information storage unit 107 of the digital broadcast receiving device according to the fifth embodiment. As channel information, a physical channel, the number of times reception is impossible, and a service ID are held. Further, network_id, original_network_id, TS_ID, TS name, service name, etc. may be held as information other than the physical channel, the number of times of reception failure, and the service ID.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus of the fifth embodiment is substantially the same as the operation of the digital broadcast receiving apparatus of the fourth embodiment described above, but the scan processing procedure is different.

  FIG. 14 is a flowchart showing scan processing performed by the channel selection control unit 106 of the digital broadcast receiving apparatus according to Embodiment 5 of the present invention. The channel selection control unit 106 first acquires a list of physical channels on which scanning is performed from the nonvolatile memory 100 (S1201). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S1201 (S1202).

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S1203).

  Subsequently, the channel selection control unit 106 acquires the reception intensity from the tuner unit 102 and compares it with a threshold value (S1204). If the reception intensity is less than the threshold (No in S1204), the process proceeds to step S1214 described later.

  If the reception intensity is greater than or equal to the threshold value in step 1204 (Yes in S1204), the tuning control unit 106 determines whether the tuner unit 102 has detected a frame lock (S1205). If the frame lock is not detected (No in S1205), the process proceeds to step S1214 described later.

  When frame lock is detected in step S1205 (Yes in S1205), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1206). ). If channel information including the selected physical channel is stored in the channel information storage unit 107 (Yes in S1206), the process proceeds to step S1218 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S1206 (No in S1206), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI or SI is started (S1207).

  Subsequently, the channel selection control unit 106 determines whether or not the PSI / SI has been acquired within a predetermined time after starting the extraction of the PSI / SI in step S1207 (S1208). If PSI / SI could not be acquired (No in S1208), the process proceeds to step S1212 described later.

  When PSI / SI can be acquired in step S1208 (Yes in S1208), the channel selection control unit 106 generates channel information (S1209). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI. Also, the count number indicating the number of times reception is impossible is set to zero.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S1209 to the channel information storage unit 107 (S1210). At this time, if channel information that matches the physical channel with the channel information acquired in step S1209 exists in the channel information storage unit 107, the channel information acquired in step S1209 is overwritten and saved on the channel information that matches the physical channel. To do.

  After adding channel information in step S1210, or when PSI / SI cannot be acquired within a predetermined time in step S1208 (No in S1208), the channel selection control unit 106 sends the PSI / SI to the stream processing unit 103. The SI extraction is stopped (S1211).

  After stopping the extraction of PSI / SI in step S1211, the channel selection control unit 106 determines whether or not all physical channels in the physical channel list acquired in step S1201 have been selected (S1212). If all physical channels have been selected (Yes in S1212), the process ends.

  If all the physical channels are not selected in step S1212 (No in S1212), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S1201. A physical channel is selected (S1213), and the process proceeds to step S1203.

  On the other hand, if the reception strength is less than the threshold value in step S1204 described above (No in S1204), or if no frame lock is detected in step S1205 (No in S1205), the channel selection control unit 106 has selected. It is determined whether channel information including a physical channel is stored in the channel information storage unit 107 (S1214). If channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S1214), the process proceeds to step S1212 described above.

  If channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1214 (Yes in S1214), the channel selection control unit 106 cannot receive channel information including the selected physical channel. 1 is increased by 1 (S1215).

  Subsequently, the channel selection control unit 106 compares the count number indicating the number of reception failures updated in step S1215 with a threshold value (for example, 5 times). If the count number is less than the threshold value (No in S1216), the process proceeds to step S1212 described above.

  If the count number indicating the number of reception failures in step S1216 is equal to or greater than the threshold value (Yes in S1216), the channel selection control unit 106 selects the physical channel that has been determined that the count number is equal to or greater than the threshold value (for example, 5 times). The included channel information is deleted from the channel information storage unit 108 (S1217), and the process proceeds to step S1212 described above.

  On the other hand, when the channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1206 described above (Yes in S1206), the channel selection control unit 106 includes the channel including the selected physical channel. The count number indicating the number of times information cannot be received is set to 0 (S1218), and the process proceeds to step S1212 described above.

  The digital broadcast receiving apparatus of the fourth embodiment does not delete the digital broadcast channel information that can no longer be received. Therefore, when the digital broadcast that can be received changes due to movement, the digital broadcast channel that cannot be received. Information remains in the channel information storage unit 107. For this reason, channel information of digital broadcasts that cannot be received increases every time the user moves, and it becomes difficult for a user to select a digital broadcast that can be received. On the other hand, in the digital broadcast receiving apparatus according to the fifth embodiment, it is possible to delete the channel information of the digital broadcast that cannot be received (steps S1216 to S1217 in FIG. 14). Further, deletion is performed when a certain number of times cannot be received, so that channel information is prevented from being deleted when a digital broadcast cannot be received temporarily, for example, entering a tunnel or the like. As described above, the digital broadcast receiving apparatus according to the fifth embodiment can easily select a digital broadcast that can be received by the user as compared with the digital broadcast receiving apparatus according to the fourth embodiment.

Embodiment 6 FIG.
Next, a digital broadcast receiving apparatus according to Embodiment 6 of the present invention will be described. FIG. 15A is a block diagram showing a configuration of the digital broadcast receiving apparatus according to the sixth embodiment. The digital broadcast receiving apparatus according to the sixth embodiment includes a position information acquisition unit 109 and a position information storage unit 110 in addition to the components (FIG. 1) of the digital broadcast reception apparatus according to the first embodiment. .

  The position information acquisition unit 109 acquires the current position information and notifies the channel selection control unit 106. The position information acquisition unit may be a global positioning system (abbreviated to GPS) receiver, or may be a device that acquires position information by another method.

  As shown in FIG. 15B, the position information storage unit 110 stores position information when the previous scan is started and position information when the current scan is started.

  The channel selection control unit 106 acquires the current position information from the position information acquisition unit 109. Further, the channel selection control unit 106 acquires and stores the position information when the previous scan is started and the position information when the current scan is started from the position information storage unit 110. Further, the channel selection control unit 106 updates the position information when the previous scan is started and the position information when the current scan is started, which are stored in the position information storage unit 110.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus of the sixth embodiment is almost the same as the operation of the digital broadcast receiving apparatus of the fifth embodiment described above, but the scanning processing procedure is different.

  FIG. 16 is a flowchart showing a scanning process performed by the channel selection control unit 106 of the digital broadcast receiving apparatus in the sixth embodiment. First, the channel selection control unit 106 acquires a list of physical channels on which scanning is performed from the nonvolatile memory 100 (S1401). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 updates the position information storage unit 110 (S1402). When updating, the position information value at the start of the current scan is written in the position information field at the start of the previous scan, and the position information field at the start of the current scan is written in the position information field. The value of the position information acquired from the information acquisition unit 109 is written.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S1401 (S1403).

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S1404).

  Subsequently, the channel selection control unit 106 acquires the reception strength from the tuner unit 102, acquires the received strength, and compares the received strength with a threshold value (S1405). If the reception intensity is less than the threshold (No in S1405), the process proceeds to step S1415 described later.

  If the reception strength is greater than or equal to the threshold value in step S1405 (Yes in S1405), the channel selection control unit 106 determines whether the tuner unit 102 has detected a frame lock (S1406). If the frame lock is not detected (No in S1406), the process proceeds to step S1415 described later.

  When frame lock is detected in step 1406 (Yes in S1406), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1407). ). If channel information including the selected physical channel is stored in the channel information storage unit 107 (No in S1407), the process proceeds to step S1419 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S1407 (Yes in S1407), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI or SI is started (S1408).

  Subsequently, the channel selection control unit 106 determines whether or not the PSI / SI has been acquired within a predetermined time after starting the extraction of the PSI / SI in step S1408 (S1409). If PSI / SI could not be acquired within a certain time (No in S1409), the process proceeds to step S1412.

  If PSI / SI can be acquired within a predetermined time in step S1409 (Yes in S1409), the channel selection control unit 106 generates channel information (S1410). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI. In addition, the count number indicating the number of times reception is not possible is 0.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S1410 to the channel information storage unit 107 (S1411). At this time, if channel information whose physical channel matches the channel information acquired in step S1410 exists in the channel information storage unit 107, the channel information acquired in step S1410 is overwritten and saved on the channel information corresponding to the physical channel. To do.

  After adding channel information in step S1411, or when PSI / SI cannot be acquired in step S1409 (No in S1409), the channel selection control unit 106 extracts PSI / SI to the stream processing unit 103. Stop (S1412).

  After stopping the PSI / SI extraction in step S1412, the channel selection control unit 106 determines whether or not all physical channels in the physical channel list acquired in step S1401 have been selected (S1413). If all physical channels have been selected (Yes in S1413), the process ends.

  When all the physical channels are not selected in step S1413 (No in S1413), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S1401. A physical channel is selected (S1414), and the process proceeds to step S1404.

  On the other hand, if the reception strength is less than the threshold value in step S1405 (No in S1405), or if no frame lock is detected in Step S1406 (No in S1406), the channel selection control unit 106 It is determined whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1415). If channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S1415), the process proceeds to step S1413 described above.

  If channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1415 (Yes in S1415), the channel selection control unit 106 cannot receive channel information including the selected physical channel. 1 is increased by 1 (S1416).

  Subsequently, the channel selection control unit 106 compares the count number indicating the number of reception failures updated in step S1416 with a threshold value (for example, 5 times) (S1417). If the count is less than the threshold (No in S1417), the process proceeds to step S1413 described above.

  If the count number indicating the number of reception failures in step S1417 is equal to or greater than the threshold value (Yes in S1417), the channel selection control unit 106 obtains channel information including the physical channel for which the count number is determined to be equal to or greater than the threshold value in step S1417. The channel information is deleted from the channel information storage unit 108 (S1418), and the process proceeds to step S1413 described above.

  On the other hand, when the channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1407 described above (Yes in S1407), the channel selection control unit 106 includes the channel including the selected physical channel. The count number indicating the number of times information cannot be received is set to 0 (S1419).

  Subsequently, the channel selection control unit 106 acquires the position information when the previous scan is started from the position information storage unit 110 and the position information when the current scan is started, and when the previous scan is started. The distance from the position to the position when the current scan is started is compared with a threshold (for example, 100 km) (S1420). If the distance is greater than or equal to the threshold (Yes in S1420), the process proceeds to step S1408 described above to start extracting PSI / SI. If the distance is less than the threshold (No in S1420), the above-described step S1413 is performed. Proceed to

  In the above-described digital broadcast receiving apparatus according to the fifth embodiment, when the selected physical channel exists in the channel information storage unit, the PSI / SI extraction is not started, so that digital broadcasts with different service IDs are transmitted on the same physical channel. If you move to an area where the digital broadcasting is available, you may not be able to acquire the channel information for that digital broadcast. On the other hand, if digital broadcasts with different service IDs are mixed on the same physical channel, both digital broadcasts may not be received. Therefore, digital broadcasts with different service IDs on the same physical channel are distant from each other. It is thought that it will be broadcast on Therefore, the digital broadcast receiving apparatus according to the sixth embodiment extracts PSI / SI even when the selected physical channel exists in the channel information storage unit when moving to a remote area (FIG. 16). In step S1420), it is possible to acquire digital broadcast channel information of different service IDs broadcast on the same physical channel. As described above, in the digital broadcast receiving apparatus according to the sixth embodiment, compared with the digital broadcast receiving apparatus according to the fifth embodiment, the mobile station moves to an area where a digital broadcast with a different service ID is transmitted on the same physical channel. Even so, the possibility that the channel information of the digital broadcast cannot be acquired can be reduced.

Embodiment 7 FIG.
Next, a digital broadcast receiving apparatus according to Embodiment 7 of the present invention will be described. The configuration of the digital broadcast receiving apparatus of the seventh embodiment is the same as the configuration of the digital broadcast receiving apparatus of the sixth embodiment described above.

  As shown in FIG. 17, the position information storage unit 110 of the digital broadcast receiving apparatus according to the seventh embodiment includes the previous position information (position information when the previous physical channel is selected) and the current position for each physical channel. Position information (position information when the same physical channel is selected this time) is stored.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the seventh embodiment is substantially the same as the operation of the digital broadcast receiving apparatus according to the sixth embodiment described above, but the scan processing procedure is different.

  FIG. 18 is a flowchart showing a scanning process performed by the channel selection control unit 106 of the digital broadcast receiving apparatus in the seventh embodiment. The channel selection control unit 106 first acquires a list of physical channels on which scanning is performed from the nonvolatile memory 100 (S1601). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S1601 (S1602).

  Subsequently, the channel selection control unit 106 updates the previous position information and the current position information corresponding to the currently selected physical channel in the position information storage unit 110 (S1603). When updating, the value written in the current position information column is first written in the previous position information column, and then the position acquired from the position information acquisition unit 109 (FIG. 15) in the current position information column. Write information value.

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S1604).

  Subsequently, the channel selection control unit 106 acquires the reception strength from the tuner unit 102, and compares the acquired reception strength with a threshold value (S1605). If the reception intensity is less than the threshold (No in S1605), the process proceeds to step S1615 described later.

  If the reception strength is equal to or greater than the threshold in step S1605 (Yes in S1605), the channel selection control unit 106 determines whether the tuner unit 102 has detected a frame lock (S1606). If no frame lock is detected (No in S1606), the process proceeds to step S1615 described later.

  When frame lock is detected in step S1606 (Yes in S1606), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1607). ). If channel information including the selected physical channel is stored in the channel information storage unit 107 (Yes in S1607), the process proceeds to step S1619 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S1607 (No in S1607), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI or SI is started (S1608).

  Subsequently, the channel selection control unit 106 determines whether or not the PSI / SI has been acquired within a predetermined time after starting the extraction of the PSI / SI in step S1608 (S1609). If the PSI / SI within a certain period of time cannot be acquired (No in S1609), the process proceeds to step S1612 described later.

  If PSI / SI can be acquired within a predetermined time in step S1609 (Yes in S1609), the channel selection control unit 106 generates channel information (S1610). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI. In addition, the count number indicating the number of times reception is not possible is 0.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S1610 to the channel information storage unit 107 (S1611). When channel information whose physical channel matches the channel information acquired in step S1610 exists in the channel information storage unit 107, the channel information acquired in step S1610 is overwritten and saved on the channel information corresponding to the physical channel.

  After adding channel information in step S1611, or when PSI / SI cannot be acquired in step S1609 (No in S1609), the channel selection control unit 106 extracts the PSI / SI to the stream processing unit 103. Stop (S1612).

  Subsequently, the channel selection control unit 106 determines whether all physical channels in the physical channel list acquired in step S1601 have been selected (S1613). If all physical channels have been selected (Yes in S1613), the process ends.

  If all the physical channels are not selected in step S1613 (No in S1613), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S1601. A physical channel is selected (S1614), and the process proceeds to step S1603 described above.

  On the other hand, if the reception strength is less than the threshold value in step S1605 described above (No in S1605), or if no frame lock is detected in Step S1606 (No in S1606), the channel selection control unit 106 It is determined whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1615). If channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S1615), the process proceeds to step S1613 described above.

  If channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1615 (Yes in S1615), the channel selection control unit 106 cannot receive channel information including the selected physical channel. 1 is increased by 1 (S1616).

  Subsequently, the channel selection control unit 106 compares the count number indicating the number of reception failures updated in step S1616 with a threshold (for example, 5 times) (S1617). If the count number indicating the number of unreceivable times is less than the threshold, the process proceeds to step S1613.

  If the count number indicating the number of times reception is not possible is greater than or equal to the threshold value in step S1617 (Yes in S1617), the channel selection control unit 106 stores the channel information determined to be greater than or equal to the threshold value in step S1217 as channel information storage. This is deleted from the unit 108 (S1618), and the process proceeds to step S1613 described above.

  On the other hand, when the channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1607 described above (Yes in S1607), the channel selection control unit 106 includes the channel including the selected physical channel. The count number indicating the number of times information cannot be received is set to 0 (S1619).

  Subsequently, the channel selection control unit 106 acquires the previous position information and the current position information of the selected physical channel from the position information storage unit 110, and sets the distance from the previous position to the current position as a threshold ( For example, it is compared with 100 km) (S1620). If the distance from the previous position to the current position is greater than or equal to the threshold (Yes in S1620), the process proceeds to step S1608 described above, and PSI / SI extraction is started. If the distance is less than the threshold, step S1613 is performed. Proceed to

  In the above-described digital broadcast receiving apparatus according to the sixth embodiment, the position information is acquired only when scanning is started (see step S1402 in FIG. 16). There is a difference between the current position and the current position, and there is a possibility that channel information of digital broadcasts of different service IDs broadcast on the same physical channel cannot be acquired. On the other hand, in the digital broadcast receiving apparatus according to the seventh embodiment, since position information is acquired every time a physical channel is selected (step S1603 in FIG. 18), the position when the position information is acquired, the current position, The difference of becomes smaller. Therefore, compared with the digital broadcast receiving apparatus of the sixth embodiment, it is possible to reduce the possibility that channel information of digital broadcasts with different service IDs broadcast on the same physical channel cannot be acquired.

Embodiment 8 FIG.
Next, a digital broadcast receiving apparatus according to an eighth embodiment of the present invention will be described. FIG. 19A is a block diagram illustrating a configuration of a digital broadcast receiving apparatus according to the eighth embodiment. The digital broadcast receiving apparatus according to the eighth embodiment includes an odometer 111 and a mileage storage unit 112 in addition to the components (FIG. 1) of the digital broadcast receiver according to the first embodiment.

  The odometer 111 measures the cumulative mileage of the vehicle and notifies the tuning control unit 106 of it. The odometer 111 is attached to a vehicle as a standard, for example.

  As shown in an example in FIG. 19B, the travel distance storage unit 112 stores the cumulative travel distance when the previous scan is started and the cumulative travel distance when the current scan is started. Yes.

  The channel selection control unit 106 acquires the current travel distance from the travel distance meter 111. Further, the channel selection control unit 106 acquires the travel distance when the previous scan is started and the travel distance when the current scan is started from the travel distance storage unit 112. Further, the channel selection control unit 106 updates the travel distance when the previous scan is started and the travel distance when the current scan is started in the travel distance storage unit 112.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the eighth embodiment is substantially the same as the operation of the digital broadcast receiving apparatus according to the fifth embodiment described above, but the scan processing procedure is different.

  FIG. 20 is a flowchart showing a scanning process performed by the channel selection control unit 106 of the digital broadcast receiving apparatus according to the eighth embodiment of the present invention. First, the channel selection control unit 106 acquires a list of physical channels on which scanning is executed from the nonvolatile memory 100 (S1801). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 updates the travel distance storage unit 112 (S1802). When updating, first write the value written in the mileage column at the start of this scan into the mileage column at the start of the previous scan, then the time when the scan was started The value of the position information acquired from the odometer 111 is written in the mileage column.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S1801 (S1803).

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S1804).

  Subsequently, the channel selection control unit 106 acquires the reception strength from the tuner unit 102, and compares the reception strength with a threshold (S1805). If the reception intensity is less than the threshold (S1805), the process proceeds to step S1815.

  If the reception strength is greater than or equal to the threshold in step S1805 (Yes in S1805), the tuning control unit 106 determines whether the tuner unit 102 has detected frame lock (S1806). If no frame lock is detected (No in S1806), the process proceeds to step S1815.

  If frame lock is detected in step S1806 (Yes in S1806), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1807). ). When channel information including the selected physical channel is stored in the channel information storage unit 107 (No in S1807), the process proceeds to step S1819 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S1807 (No in S1807), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI or SI is started (S1808).

  Subsequently, the channel selection control unit 106 determines whether or not the PSI / SI has been acquired within a predetermined time after starting the extraction of the PSI / SI in step S1808 (S1809). If PSI / SI cannot be acquired within a certain time (No in S1809), the process proceeds to step S1812 described later.

  If PSI / SI can be acquired within a predetermined time in step S1809 (Yes in S1809), the channel selection control unit 106 generates channel information (S1811). The physical channel of the channel information is the currently selected physical channel. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI. The service ID is acquired from the acquired PSI / SI. In addition, the count number indicating the number of times reception is not possible is 0.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S1810 to the channel information storage unit 107 (S1810). At this time, if channel information whose physical channel matches the channel information acquired in step S1810 exists in the channel information storage unit 107, the channel information acquired in step S1810 is overwritten and saved on the channel information corresponding to the physical channel.

  Subsequently, the channel selection control unit 106 causes the stream processing unit 103 to stop extracting PSI / SI (S1812).

  Subsequently, the channel selection control unit 106 determines whether all physical channels in the physical channel list acquired in step S1801 have been selected (S1813). If all physical channels have been selected (Yes in S1813), the process ends.

  If all the physical channels are not selected in step S1813 (No in S1813), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S1801. A physical channel is selected (S1814), and the process proceeds to step S1804 described above.

  On the other hand, if the reception strength is less than the threshold value in step S1805 (No in S1805), or if no frame lock is detected in Step S1806 (No in S1806), the channel selection control unit 106 It is determined whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S1815). If channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S1815), the process proceeds to step S1813.

  If channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1815 (Yes in S1815), the channel selection control unit 106 cannot receive channel information including the selected physical channel. 1 is increased by 1 (S1816).

  Subsequently, the channel selection control unit 106 compares the count number indicating the number of reception failures updated in step S1816 with a threshold value (for example, 5 times) (S1817). If the count number indicating the number of unreceivable times is less than the threshold, the process proceeds to step S1813 described above.

  If the count number indicating the number of reception failures in step S1817 is equal to or greater than the threshold (Yes in S1817), the channel selection control unit 106 determines the channel information determined to be greater than or equal to the threshold in step S1817 as the channel information storage unit. (S1818), the process proceeds to step S1813 described above.

  On the other hand, when channel information including the selected physical channel is stored in the channel information storage unit 107 in step S1807 described above (Yes in S1807), the channel selection control unit 106 includes the channel including the selected physical channel. The count number indicating the number of times information cannot be received is set to 0 (S1819).

  Subsequently, the channel selection control unit 106 acquires the travel distance when the previous scan is started and the travel distance when the current scan is started from the travel distance storage unit 112, and calculates the difference between these travel distances. It is compared with a threshold value (for example, 100 km) (S1820). If it is equal to or greater than the threshold value (Yes in S1820), the process proceeds to step S1808 described above to start extracting PSI / SI, and if it is less than the threshold value (No in S1820), the process proceeds to step S1813 described above.

  In the digital broadcast receiving apparatus of the above-described sixth embodiment, in order to more reliably acquire digital broadcast channel information of different service IDs broadcasted on the same physical channel, a position information acquisition unit (FIG. 15). The position information acquisition unit 109) was necessary. On the other hand, in the digital broadcast receiving apparatus of the eighth embodiment, by using the mileage that can be obtained from the odometer that is always attached to the vehicle (step S1820 in FIG. 20), the apparatus configuration is simpler. The possibility that digital broadcast channel information of different service IDs broadcast on the same physical channel cannot be acquired can be reduced.

Embodiment 9 FIG.
Next, a digital broadcast receiver according to Embodiment 9 of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the ninth embodiment is the same as that of the digital broadcast receiving apparatus according to the eighth embodiment described above.

  The mileage storage unit 112 of the digital broadcast receiver according to the ninth embodiment, as shown in FIG. 21, shows the previous mileage (cumulative mileage when the previous physical channel is selected) and the current time for each physical channel. Mileage (cumulative mileage when the same physical channel is selected this time) is stored.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the ninth embodiment is substantially the same as the operation of the digital broadcast receiving apparatus according to the eighth embodiment described above, but the scan processing procedure is different.

  FIG. 22 is a flowchart illustrating a scanning process performed by the channel selection control unit 106 of the digital broadcast receiving apparatus according to the ninth embodiment. The channel selection control unit 106 first acquires a list of physical channels on which scanning is performed from the nonvolatile memory 100 (S2001). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S2001 (S2002).

  Subsequently, the channel selection control unit 106 updates the previous travel distance and the current travel distance corresponding to the currently selected physical channel of the travel distance storage unit 112 (S2003). In updating, first, the value written in the current travel distance column is written in the previous travel distance field, and then the travel distance value obtained from the travel distance meter 111 is entered in the current travel distance field. Write.

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S2004).

  Subsequently, the channel selection control unit 106 acquires the reception strength from the tuner unit 102, and compares the acquired reception strength with a threshold value (S2005). If the reception intensity is less than the threshold (No in S2005), the process proceeds to step S2015 described later.

  In step S2005, when the reception strength is equal to or higher than the threshold (Yes in S2005), the channel selection control unit 106 determines whether the tuner unit 102 has detected a frame lock (S2006). If no frame lock is detected (No in S2005), the process proceeds to step S2015 described later.

  When frame lock is detected in step S2006 (Yes in S2006), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S2007). ). If channel information including the selected physical channel is stored in the channel information storage unit 107 (Yes in S2007), the process proceeds to step S2019 described later.

  In step S2007, when channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S2007), the channel selection control unit 106 sends PSI / SI (that is, Extraction of at least one of PSI and SI is started (S2008).

  Subsequently, the channel selection control unit 106 determines whether or not PSI / SI has been acquired within a predetermined time after starting the extraction of PSI / SI in step S2008 (S2009). If PSI / SI cannot be acquired within a certain time (No in S2009), the process proceeds to step S2012.

  If PSI / SI can be acquired within a certain time in step S2009 (Yes in S2009), the channel selection control unit 106 generates channel information (S2010). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI. In addition, the count of the number of times reception is not possible is 0.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S2010 to the channel information storage unit 107 (S2011). If channel information whose physical channel matches the channel information acquired in step S2010 exists in the channel information storage unit 107, the channel information acquired in step S2010 is overwritten and saved on the channel information corresponding to the physical channel.

  After adding channel information in step S2011 or when PSI / SI cannot be acquired in step S2009 (No in S2009), the channel selection control unit 106 extracts PSI / SI to the stream processing unit 103. Stop (S2012).

  Subsequently, the channel selection control unit 106 determines whether all physical channels in the physical channel list acquired in step S2001 have been selected (S2013). If all physical channels have been selected (Yes in S2013), the process ends.

  When all the physical channels are not selected in step S2013 (No in S2013), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S2001. A physical channel is selected (S2014), and the process proceeds to step S2003 described above.

  On the other hand, if the reception strength is less than the threshold value in step S2005 described above (No in S2005), or if no frame lock is detected in step S2006 (No in S2006), the channel selection control unit 106 has selected. It is determined whether channel information including a physical channel is stored in the channel information storage unit 107 (S2015). If channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S2015), the process proceeds to step S2013 described above.

  When channel information including the selected physical channel is stored in the channel information storage unit 107 in step S2015 (Yes in S2015), the channel selection control unit 106 cannot receive channel information including the selected physical channel. Is increased by 1 (S2016).

  Subsequently, the channel selection control unit 106 compares the count number indicating the number of reception failures updated in step S2016 with a threshold (for example, 5 times) (S2107). If the count number indicating the number of unreceivable times is less than the threshold, the process proceeds to step S2013 described above.

  If the count number indicating the number of times reception is not possible is greater than or equal to the threshold value in step S2017 (Yes in S2017), the channel selection control unit 106 stores the channel information determined to be greater than or equal to the threshold value in step S2017 as channel information storage. The data is deleted from the unit 108 (S2018), and the process proceeds to step S2013 described above.

  On the other hand, when the channel information including the selected physical channel is stored in the channel information storage unit 107 in step S2007 described above (Yes in S2007), the channel selection control unit 106 includes the channel including the selected physical channel. The count number indicating the number of times information cannot be received is set to 0 (S2019).

  Subsequently, the channel selection control unit 106 acquires the previous travel distance and the current travel distance for the selected physical channel from the travel distance storage unit 112, and the difference between the previous travel distance and the current travel distance. Is compared with a threshold (for example, 100 km) (S2020). If the difference between the previous travel distance and the current travel distance is greater than or equal to the threshold (Yes in S2020), the process proceeds to the above-described step S2008 to start extracting PSI / SI, and the difference in travel distance is less than the threshold (No in S2020), the process proceeds to step S2013 described above.

  In the digital broadcast receiving apparatus of the above-described eighth embodiment, the travel distance is acquired only when scanning is started (see step S1802 in FIG. 20). Therefore, when time elapses from the start of scanning, a difference occurs between the travel distance when the scan is started and the current travel distance, and channel information of digital broadcasts of different service IDs broadcast on the same physical channel May not be able to get. On the other hand, in the digital broadcast receiving apparatus of the ninth embodiment, the travel distance is acquired (updated) every time a physical channel is selected (step S2003 in FIG. 22). The difference with the travel distance becomes smaller. Therefore, the digital broadcast receiving device of the ninth embodiment may not be able to acquire digital broadcast channel information of different service IDs broadcasted on the same physical channel as compared to the digital broadcast receiving device of the eighth embodiment. Can be reduced.

Embodiment 10 FIG.
Next, a digital broadcast receiver according to Embodiment 10 of the present invention will be described. FIG. 23A is a block diagram illustrating a configuration of the digital broadcast receiving apparatus according to the tenth embodiment. The digital broadcast receiving apparatus according to the tenth embodiment includes a time management unit 113 and a time storage unit 114 in addition to the components of the digital broadcast receiving apparatus according to the first embodiment.

  The time management unit 113 manages the current time and notifies the channel selection control unit 106. The time of the time management unit 113 can be updated by the channel selection management unit 106.

  As shown in FIG. 23B, the time storage unit 114 stores the time when the previous scan was started and the time when the current scan was started.

  The channel selection control unit 106 acquires the current time from the time management unit 113. Further, the channel selection control unit 106 acquires the time when the previous scan was started and the time when the current scan was started from the time storage unit 114. Further, the channel selection control unit 106 updates the time when the previous scan is started and the time when the current scan is started in the time storage unit 114.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the tenth embodiment is substantially the same as the operation of the digital broadcast receiving apparatus according to the fifth embodiment described above, but the scanning processing procedure is different.

  FIG. 24 is a flowchart showing a scanning process performed by the channel selection control unit 106 of the digital broadcast receiving apparatus in the tenth embodiment of the present invention. First, the channel selection control unit 106 acquires a list of physical channels on which scanning is executed from the nonvolatile memory 100 (S2201). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 updates the time storage unit 114 (S2202). When updating, write the value written in the time column when starting the current scan in the time column when starting the previous scan, and in the time column when starting the next scan, The time value acquired from the time management unit 113 is substituted.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S2201 (S2203).

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S2204).

  Subsequently, the channel selection control unit 106 acquires the reception strength from the tuner unit 102, and compares the reception strength with a threshold (S2205). If the reception intensity is less than the threshold value (No in S2215), the process proceeds to step S2215 described later.

  If the reception intensity is greater than or equal to the threshold value in step S2205 (Yes in S2205), the channel selection control unit 106 determines whether the tuner unit 102 has detected frame lock (S2206). If the frame lock is not detected (No in S2206), the process proceeds to step S2215 described later.

  If frame lock is detected in step S2206 (Yes in S2206), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S2207). ). If channel information including the selected physical channel is stored in the channel information storage unit 107 (No in S2207), the process proceeds to step S2219 described later.

  If channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S2207 (Yes in S2207), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI or SI is started (S2208).

  Subsequently, the channel selection control unit 106 determines whether or not PSI / SI has been acquired within a predetermined time after starting the extraction of PSI / SI in step S1808 (S2209). If the PSI / SI cannot be acquired within a certain time (No in S2209), the process proceeds to step S2212 described later.

  If PSI / SI can be acquired within a predetermined time in step S2209 (Yes in S2209), the channel selection control unit 106 generates channel information (S2210). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI. In addition, the count number indicating the number of times reception is not possible is 0.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S2210 to the channel information storage unit 107 (S2211). At this time, if channel information whose physical channel matches the channel information acquired in step S1810 exists in the channel information storage unit 107, the channel information acquired in step S2210 is overwritten and saved on the channel information corresponding to the physical channel.

  After adding channel information in step S2211, or when PSI / SI cannot be acquired in step S2209 (No in S2209), the channel selection control unit 106 extracts PSI / SI to the stream processing unit 103. Stop (S2212).

  Subsequently, the channel selection control unit 106 determines whether all physical channels in the physical channel list acquired in step S2201 have been selected (S2213). If all physical channels have been selected (Yes in S2213), the process ends.

  When all the physical channels are not selected in step S2213 (No in S2213), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S2201. A physical channel is selected (S2214), and the process proceeds to step S2204 described above.

  On the other hand, if the reception strength is less than the threshold value in step 2205 described above (No in S2205) or if no frame lock is detected in Step 2206 (No in S2206), the channel selection control unit 106 has selected. It is determined whether channel information including a physical channel is stored in the channel information storage unit 107 (S2215). If channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S2215), the process proceeds to step S2213 described above.

  When channel information including the selected physical channel is stored in the channel information storage unit 107 in step S2215 (Yes in S2215), the channel selection control unit 106 cannot receive channel information including the selected physical channel. 1 is increased by 1 (S2216).

  Subsequently, the channel selection control unit 106 compares the count of the number of unreceivable times updated in step S2216 with a threshold (for example, 5 times) (S2217). If the number of unreceivable times is less than the threshold value (No in S2217), the process proceeds to step S2213 described above.

  If the count number indicating the number of reception failures in step S2217 is equal to or greater than the threshold (Yes in S2217), the channel selection control unit 106 stores the channel information determined to be greater than or equal to the threshold in step S2217 as channel information storage. This is deleted from the unit 108 (S2218), and the process proceeds to step S2213 described above.

  On the other hand, when channel information including the selected physical channel is stored in the channel information storage unit 107 in step S2207 described above (Yes in S2207), the channel selection control unit 106 includes a channel including the selected physical channel. The number of times information cannot be received is set to 0 (S2219).

  Subsequently, the channel selection control unit 106 acquires the time when the previous scan was started from the time storage unit 114, the time when the current scan was started, and the time when the previous scan was started, The difference from the time when the current scan is started is compared with a threshold (for example, 1 hour) (S2220). If the time difference is equal to or greater than the threshold (Yes in S2220), the process proceeds to step S2208 to start extracting PSI / SI. If the time difference is less than the threshold (No in S2220), the above-described step S2213 is performed. Proceed to

  In the above-described digital broadcast receiving apparatus according to the sixth embodiment, in order to more reliably acquire digital broadcast channel information of different service IDs broadcast on the same physical channel, a position information acquisition unit (position of FIG. 15). An information acquisition unit 109) was necessary. In contrast, the digital broadcast receiving apparatus according to the tenth embodiment may not be able to acquire digital broadcast channel information of different service IDs broadcast on the same physical channel based on the time information (step S2220 in FIG. 24). Is reduced. The time management unit is considered to be installed in a general digital broadcast receiving apparatus in order to realize a function such as an electronic program guide (EPG). That is, the digital broadcast receiving apparatus of the tenth embodiment uses different time services that are broadcast on the same physical channel with a simpler apparatus configuration by using a time management unit that is generally equipped in the digital broadcast receiving apparatus. The possibility that ID digital broadcast channel information cannot be acquired can be reduced.

  Further, in the digital broadcast receiving apparatus of the above-described eighth embodiment, when the vehicle is transported by an automobile transport vehicle, a ship, or the like (that is, when the vehicle itself does not travel), the travel distance of the odometer is not updated. There is a possibility that channel information of digital broadcasts with different service IDs broadcast on channels cannot be acquired. On the other hand, in the digital broadcast receiving apparatus according to the tenth embodiment, even when the vehicle is transported by an automobile carrier or a ship, the time of the time management unit is updated, so that different services broadcast on the same physical channel. The possibility that ID digital broadcast channel information cannot be acquired can be reduced. Therefore, the digital broadcast receiving apparatus according to the tenth embodiment acquires the channel information of the digital broadcasts with different service IDs broadcasted on the same physical channel more reliably than the digital broadcast receiving apparatus according to the eighth embodiment. The possibility of not being able to be reduced can be reduced.

Embodiment 11 FIG.
Next, a digital broadcast receiving apparatus according to Embodiment 11 of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the eleventh embodiment is the same as the configuration of the digital broadcast receiving apparatus according to the tenth embodiment described above.

  As shown in FIG. 25, the time storage unit 114 of the digital broadcast receiving apparatus according to the eleventh embodiment is the same as the time when the previous physical channel is selected for each physical channel (hereinafter, the previous time). The time when the physical channel is selected (hereinafter, this time) is stored.

  The operation of the channel selection control unit 106 of the digital broadcast receiving apparatus according to the eleventh embodiment is substantially the same as that of the digital broadcast receiving apparatus according to the tenth embodiment described above, but the scanning processing procedure is different.

  FIG. 26 is a flowchart showing a scan process performed by the channel selection control unit 106 of the digital broadcast receiving apparatus in the eleventh embodiment. First, the channel selection control unit 106 acquires a list of physical channels on which scanning is executed from the nonvolatile memory 10 (S2401). The list of physical channels includes all the physical channels on which digital broadcasting may be transmitted one by one. The order of physical channels in the physical channel list may be ascending, descending, or any other order.

  Subsequently, the channel selection control unit 106 selects the first physical channel in the physical channel list acquired in step S2401 (S2402).

  Subsequently, the channel selection control unit 106 updates the previous time and the current time for the physical channel currently selected by the time management unit 114 (S2403). In the update, first, the value written in the current time column is written in the previous time column, and then the time value acquired from the time management unit 113 is written in the current time column.

  Subsequently, the channel selection control unit 106 controls the tuner unit 102 using the selected physical channel (S2404).

  Subsequently, the channel selection control unit 106 acquires the reception intensity from the tuner unit 102, and compares the acquired reception intensity with a threshold value (S2405). If the reception intensity is less than the threshold (No in S2405), the process proceeds to step S2415 described later.

  If the reception strength is greater than or equal to the threshold value in step S2405 (Yes in S2405), the channel selection control unit 106 determines whether the tuner unit 102 has detected a frame lock (S2406). If the frame lock is not detected (No in S2406), the process proceeds to step S2415 described later.

  If frame lock is detected in step S2406 (Yes in S2406), the channel selection control unit 106 determines whether channel information including the selected physical channel is stored in the channel information storage unit 107 (S2407). ). If channel information including the selected physical channel is stored in the channel information storage unit 107 (Yes in S2407), the process proceeds to step S2419 described later.

  If the channel information including the selected physical channel is not stored in the channel information storage unit 107 in step S2407 (No in S2407), the channel selection control unit 106 sends the PSI / SI (that is, Extraction of at least one of PSI or SI is started (S2408).

  Subsequently, the channel selection control unit 106 determines whether or not PSI / SI has been acquired within a predetermined time after starting the extraction of PSI / SI in step S2408 (S2409). If PSI / SI could not be acquired (No in S2412), the process proceeds to step S2412 described later.

  When PSI / SI can be acquired in step S2409 (Yes in S2409), the channel selection control unit 106 generates channel information (S2410). The physical channel of the channel information is the currently selected physical channel. The service ID is acquired from the acquired PSI / SI. When channel information includes network_id, original_network_id, TS_ID, TS name, service name, etc. as information other than the physical channel and service ID, these values are acquired from the acquired PSI / SI. In addition, the count number indicating the number of times reception is not possible is 0.

  Subsequently, the channel selection control unit 106 adds the channel information generated in step S2410 to the channel information storage unit 107 (S2411). At this time, if channel information whose physical channel matches the channel information acquired in step S2410 exists in the channel information storage unit 107, the channel information acquired in step S2410 is overwritten and saved on the channel information corresponding to the physical channel. To do.

  After adding channel information in step S2411, or when PSI / SI cannot be acquired in step S2409 (No in S2409), the channel selection control unit 106 extracts PSI / SI to the stream processing unit 103. Stop (S2412).

  Subsequently, the channel selection control unit 106 determines whether or not all physical channels in the physical channel list acquired in step S2401 have been selected (S2413). If all physical channels have been selected (Yes in S2413), the process ends.

  If all the physical channels are not selected in step S2413 (No in S2413), the channel selection control unit 106 selects the next physical channel next to the currently selected physical channel from the physical channel list acquired in step S2401. A physical channel is selected (S2414), and the process proceeds to step S2403 described above.

  On the other hand, if the reception strength is less than the threshold value in step S2405 (No in S2405), or if no frame lock is detected in step S2406 (No in S2406), the channel selection control unit 106 has selected. It is determined whether channel information including a physical channel is stored in the channel information storage unit 107 (S2415). If channel information including the selected physical channel is not stored in the channel information storage unit 107 (No in S2415), the process proceeds to step S2413 described above.

  On the other hand, when channel information including the selected physical channel is stored in the channel information storage unit 107 in step S2415 (Yes in S2415), the channel selection control unit 106 sets the channel information including the selected physical channel. The count number indicating the number of unreceivable times is increased by 1 (S2416).

  Subsequently, the channel selection control unit 106 compares the count number indicating the number of reception failures updated in step S2416 with a threshold value (for example, 5 times) (S2417). If the count number indicating the number of times reception is not possible is less than the threshold (No in S2417), the process proceeds to step S2413 described above.

  When the count number indicating the number of reception failures in step S2417 is equal to or greater than the threshold value (Yes in S2417), the channel selection control unit 106 stores the channel information determined to be greater than or equal to the threshold value in step S2417 as channel information storage. The data is deleted from the unit 108 (S2418), and the process proceeds to step S2413 described above.

  On the other hand, if the channel information including the selected physical channel is stored in the channel information storage unit 107 in step S2407 described above (Yes in S2407), the channel selection control unit 106 includes the channel including the selected physical channel. The count number indicating the number of times information cannot be received is set to 0 (step S2419).

  Subsequently, the channel selection control unit 106 acquires the previous time and the current time of the selected physical channel from the time storage unit 114, and sets the difference between the previous time and the current time as a threshold (for example, 1 hour). ) (Step S2420). If the time difference is equal to or greater than the threshold (Yes in S2420), the process proceeds to step S2408 described above to start extracting PSI / SI. If the time difference is less than the threshold (No in S2420), the process proceeds to step S2413 described above. .

  In the digital broadcast receiving apparatus of the tenth embodiment described above, the time is acquired only when the scan is started (see S2202 in FIG. 24). There is a difference between the time and the current time, and there is a possibility that channel information of digital broadcasts with different service IDs broadcast on the same physical channel cannot be acquired. On the other hand, in the digital broadcast receiving apparatus according to the eleventh embodiment, since the time is acquired every time a physical channel is selected (S2403 in FIG. 26), there is a difference between the time when the time is acquired and the current time. Can be small. Therefore, the digital broadcast receiving apparatus according to the eleventh embodiment can acquire the channel information of the digital broadcasts with different service IDs broadcasted on the same physical channel more reliably than the digital broadcast receiving apparatus according to the tenth embodiment. The possibility of not being able to be reduced can be reduced.

Embodiment 12 FIG.
Next, a digital broadcast receiving apparatus according to the twelfth embodiment of the present invention is described. FIG. 27 is a block diagram showing a configuration of the digital broadcast receiving apparatus according to the twelfth embodiment. In addition to the components of the digital broadcast receiving apparatus of the tenth embodiment, the digital broadcast receiving apparatus of the twelfth embodiment includes a second antenna unit 115, a second tuner unit 116, and a demultiplexing unit 117. It is prepared for. In order to distinguish between two antenna units and a tuner unit, hereinafter, the antenna unit 101 is referred to as a first antenna unit 101 and the tuner unit 102 is referred to as a first tuner unit 102.

  The second antenna unit 115 can receive a digital broadcast signal transmitted from a broadcast station. The digital broadcast signal received by the second antenna unit 115 is input to the second tuner unit 116. The second tuner unit 116 extracts a signal of a specific physical channel from the digital broadcast signal input from the second antenna unit 115, performs demodulation and error correction on the signal, and sends the TS to the demultiplexing unit 117. Output.

  The channel selection control unit 106 controls which physical channel signal of the digital broadcast signal supplied from the second antenna unit 115 is extracted by the second tuner unit 116.

  The second tuner unit 116 receives various information such as reception intensity information indicating reception intensity of a physical channel from which a digital broadcast signal is extracted, reception C / N ratio information, PLL lock information, frame lock information, and error rate information. At least one of them is output and notified to the channel selection control unit 106.

  The demultiplexing unit 117 extracts the PSI and SI from the TS given from the second tuner unit 116 and notifies the tuning control unit 106 of the extracted PSI and SI.

  Of the PSI and SI included in the TS provided from the second tuner unit 116, which PSI and SI the demultiplexing unit 117 extracts is controlled by the channel selection control unit 106.

  The first antenna unit 101, the first tuner unit 102, the stream processing unit 103, and the video / audio output unit 104 constitute a first system 118. Further, the second antenna unit 115, the second tuner unit 116, and the demultiplexing unit 117 constitute a second system 120. The user instruction receiving unit 105, the channel selection control unit 106, the channel information storage unit 107, the time management unit 113, and the time storage unit 114 are a common unit 119 for controlling both the first system 118 and the second system 120. Is configured.

  FIG. 28 is a flowchart showing operations of the first system 118 and the common unit 119 controlled by the channel selection control unit 106 of the digital broadcast receiving apparatus in the twelfth embodiment.

  The flowchart shown in FIG. 28 starts processing when the power of the digital broadcast receiving apparatus is turned on (start). First, the channel selection control unit 106 performs channel selection processing for the digital broadcast that was selected before the power was turned off (S2601). The details of the channel selection process are as described in the first embodiment.

  Next, the channel selection control unit 106 waits for an instruction from the user instruction receiving unit 105 (S2602).

  When there is an instruction from the user in step S2602, the channel selection control unit 106 performs channel selection stop processing (step S2603). The details of the channel selection stop process are as described in the first embodiment of the present invention.

  Subsequently, the channel selection control unit 106 performs channel selection processing for the digital broadcast selected by the user in step S2602 (step S2604), and then proceeds to the above-described step S2602 and waits for an instruction from the user.

  FIG. 29 is a flowchart showing operations of the common unit 119 and the second system 120 controlled by the channel selection control unit 106 of the digital broadcast receiving apparatus in the twelfth embodiment.

  The flowchart shown in FIG. 29 starts processing when the power of the digital broadcast receiving apparatus is turned on. The channel selection control unit 106 repeatedly executes scanning (S2701). The details of the scanning process are as described in the first embodiment.

  In the digital broadcast receivers according to the first to eleventh embodiments, the user cannot view the digital broadcast during the scan execution. On the other hand, in the digital broadcast receiving apparatus according to the twelfth embodiment, while the user views the digital broadcast using the first system 18, the second system 19 can be used to perform scanning. it can. Therefore, the user can view the digital broadcast even during the scan execution.

  The present invention is directed to a digital broadcast receiving device mounted on a mobile body such as a vehicle or a portable terminal device, in which the digital broadcast that can be received frequently changes, and it is necessary to perform scanning and acquire channel information each time. Is particularly effective.

  Reference Signs List 101 antenna unit (first antenna unit) 102 tuner unit (first tuner unit) 103 stream processing unit 104 video / audio output unit 105 user instruction receiving unit 106 channel selection control unit 107 channel information storage unit , 108 reception intensity storage unit, 109 position information acquisition unit, 110 position information storage unit, 111 odometer, 112 mileage storage unit, 113 time management unit, 114 time storage unit, 115 second antenna unit, 116 second Tuner section, 117 demultiplexing section, 118 first system, 119 common section, 120 second system.

Claims (22)

A tuner unit that selects a physical channel and acquires a digital broadcast stream transmitted on the selected physical channel;
The program identification information and program arrangement information included in the digital broadcast stream acquired by the tuner unit are extracted, the video stream and the audio stream included in the digital broadcast stream acquired by the tuner unit are decoded, and the video signal and A stream processing unit for obtaining an audio signal;
A video / audio output unit that outputs a video signal and an audio signal acquired from the stream processing unit;
A channel information storage unit for storing channel information necessary for selecting a digital broadcast;
Instructing the tuner unit on a physical channel to be selected, instructing the stream processing unit on program identification information and program arrangement information to be extracted, obtaining channel information from the channel information storage unit, A channel selection control unit for updating channel information in the channel information storage unit;
A physical channel storage determination unit that determines whether or not a physical channel is stored in the channel information storage unit,
The tuner unit notifies the channel selection control unit of the reception strength of the selected physical channel,
The tuning control unit stores a history of reception strength when a physical channel is selected by the tuner unit, calculates a reception strength score from the history of reception strength,
The channel selection control unit, for a physical channel that is determined not to be stored in the channel information storage unit by the physical channel storage determination unit and for which the reception strength score satisfies a predetermined condition, selects the physical channel. The channel information in the channel information storage unit is updated based on the extracted information by performing extraction processing for extracting at least one of program identification information and program arrangement information by the stream processing unit in a state selected by the tuner unit. For the physical channel determined by the physical channel storage determination unit to be stored in the channel information storage unit and the physical channel for which the reception strength score does not satisfy the predetermined condition, the extraction processing by the stream processing unit is performed. A digital broadcast receiver characterized in that it is not performed.   2. The channel selection control unit, when updating channel information in the channel information storage unit, makes a difference in frequency of selecting a physical channel by the tuner unit according to the reception strength score. The digital broadcast receiver described in 1. The tuner unit acquires frame lock information of the selected physical channel and notifies the channel selection control unit,
3. The digital broadcast receiving apparatus according to claim 1, wherein the channel selection control unit does not perform the extraction processing by the stream processing unit for a physical channel in which frame lock is not detected. The tuner unit notifies the channel selection control unit of the reception strength of the selected physical channel, acquires frame lock information of the selected physical channel and notifies the channel selection control unit,
The tuning control unit is
When the received strength notified from the tuner unit is less than a threshold and the physical channel for which frame lock information has not been detected, the count number indicating the number of reception failures is increased, and when the count number exceeds the threshold, The digital broadcast receiving apparatus according to any one of claims 1 to 3, wherein channel information of the physical channel is deleted from the channel information storage unit. A position information acquisition unit for acquiring position information;
The tuning control unit is
When starting scanning, the position information acquisition unit acquires position information,
Even when the selected physical channel is stored in the channel information storage unit, if the difference between the position when the previous scan was started and the position when the current scan was started is greater than or equal to the threshold value The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner unit. The digital broadcast receiver according to the item. A position information acquisition unit for acquiring position information;
The tuning control unit is
Each time a physical channel is selected, position information is acquired by the position information acquisition unit,
Even when a physical channel is stored in the channel information storage unit, there is a difference between the position information acquired when the physical channel is selected and the position when the same physical channel is selected in the previous scan. The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner unit when the threshold value is equal to or greater than a threshold value. 5. The digital broadcast receiver according to any one of 4 to 4. It further comprises an odometer that measures the mileage of the vehicle,
The tuning control unit is
When starting a scan, get the mileage by the odometer,
Even if the selected physical channel is stored in the channel information storage unit, the difference between the travel distance when the previous scan was started and the travel distance when the current scan was started is greater than or equal to the threshold value 5. The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner unit. The digital broadcast receiver according to claim 1. It further comprises an odometer that measures the mileage of the vehicle,
The tuning control unit is
Each time a physical channel is selected, the odometer is used to obtain the mileage,
Even when the selected physical channel is stored in the channel information storage unit, the difference between the travel distance when the physical channel is selected and the travel distance when the same physical channel is selected in the previous scan. When the value is equal to or greater than a threshold, the stream processing unit performs the extraction process with the selected physical channel selected by the tuner unit, and updates the channel information in the channel information storage unit. Item 5. The digital broadcast receiver according to any one of Items 1 to 4. A time management unit for managing time;
The tuning control unit is
When starting the scan, obtain time information by the time management unit,
Even when the selected physical channel is stored in the channel information storage unit, if the difference between the time when the previous scan was started and the time when the current scan was started is greater than or equal to the threshold value 5. The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner. The digital broadcast receiver described in 1. It further includes a time management unit that manages the current time,
The tuning control unit is
Get time information every time you select a physical channel,
Even when the selected physical channel is stored in the channel information storage unit, the difference between the time when the physical channel is selected and the time when the same physical channel is selected in the previous scan is greater than or equal to the threshold value. In this case, the extraction processing is performed by the stream processing unit in a state where the physical channel is selected by the tuner unit, and the channel information in the channel information storage unit is updated. The digital broadcast receiving apparatus according to any one of the above. The tuner unit is a first tuner unit,
A second tuner unit that selects a physical channel and acquires a digital broadcast stream transmitted on the selected physical channel; program identification information and a program included in the digital broadcast stream acquired by the second tuner unit A demultiplexing unit for extracting sequence information;
The channel selection control unit, while outputting video and audio of digital broadcasting using the second tuner and the demultiplexer and the video and audio output unit, the first tuner section and the stream processing unit The digital broadcast receiver according to any one of claims 1 to 10, wherein channel information in the channel information storage unit is updated by using. A tuner unit that selects a physical channel and acquires a digital broadcast stream transmitted on the selected physical channel;
The program identification information and program arrangement information included in the digital broadcast stream acquired by the tuner unit are extracted, the video stream and the audio stream included in the digital broadcast stream acquired by the tuner unit are decoded, and the video signal and A stream processing unit for obtaining an audio signal;
A video / audio output unit that outputs a video signal and an audio signal acquired from the stream processing unit;
A channel information storage unit for storing channel information necessary for selecting a digital broadcast;
Instructing the tuner unit on a physical channel to be selected, instructing the stream processing unit on program identification information and program arrangement information to be extracted, obtaining channel information from the channel information storage unit, A digital broadcast receiving method using a channel selection control unit that updates channel information in the channel information storage unit,
The tuner unit notifies the channel selection control unit of the reception strength of the selected physical channel,
A physical channel storage determining step for determining whether a physical channel is stored in the channel information storage unit;
Storing a history of reception strength when a physical channel is selected in the tuner unit, and calculating a reception strength score from the history of reception strength;
For a physical channel that has been determined not to be stored in the channel information storage unit in the physical channel storage determination step and that has a reception strength score that satisfies a predetermined condition, the physical channel is selected by the tuner unit The channel information storage unit updates the channel information in the channel information storage unit based on the extracted information by performing an extraction process for extracting at least one of program identification information and program arrangement information by the stream processing unit. A channel information update step in which the extraction processing by the stream processing unit is not performed for the physical channel determined to be stored in the physical channel and the physical channel for which the reception strength score does not satisfy the predetermined condition. Digital broadcasting reception method .   13. The digital broadcast receiving method according to claim 12, wherein in the channel information updating step, a frequency is selected for selecting a physical channel in the tuner unit according to the reception strength score. The tuner unit acquires frame lock information of the selected physical channel and notifies the channel selection control unit,
14. The digital broadcast receiving method according to claim 12, wherein, in the channel information update step, the extraction processing by the stream processing unit is not performed for a physical channel for which frame lock is not detected by the tuner unit. The tuner unit notifies the channel selection control unit of the reception strength of the selected physical channel, acquires frame lock information of the selected physical channel and notifies the channel selection control unit,
In the channel information update step,
When the reception strength of the selected physical channel is less than the threshold value, or when no frame lock is detected, the count number indicating the number of times reception is not possible is increased, and when the count number exceeds the threshold value, the selected physical channel 15. The digital broadcast receiving method according to claim 12, wherein channel information of the channel is deleted from the channel information storage unit. Using a location information acquisition unit that acquires location information,
In the channel information update step,
When starting scanning, the position information acquisition unit acquires position information,
In the channel information update step, even when the selected physical channel is stored in the channel information storage unit, the position information when the previous scan is started and the position information when the current scan is started 16. The channel information is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner unit when the difference is equal to or greater than a threshold value. The digital broadcast receiving method according to any one of the above. Using a location information acquisition unit that acquires location information,
In the channel information update step,
Each time a physical channel is selected by the tuner unit, position information is acquired by the position information acquisition unit,
In the channel information update step, even if the selected physical channel is stored in the channel information storage unit, the same physical channel in the previous scan as the position information acquired when the physical channel is selected When the difference from the position information when selecting is greater than or equal to the threshold value, the stream processing unit performs the extraction process with the physical channel selected by the tuner unit, and the channel information stored in the channel information storage unit The digital broadcast receiving method according to claim 12, wherein the digital broadcast receiving method is updated. Using an odometer that measures the mileage of the vehicle,
In the channel information update step,
When starting a scan, get the mileage by the odometer,
Even if the selected physical channel is stored in the channel information storage unit, the difference between the travel distance when the previous scan was started and the travel distance when the current scan was started is greater than or equal to the threshold value The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner unit. The digital broadcast receiving method according to claim 1. Using an odometer that measures the mileage of the vehicle,
In the channel information update step, every time a physical channel is selected, a travel distance is obtained by the odometer,
Even when the selected physical channel is stored in the channel information storage unit, the difference between the travel distance when the physical channel is selected and the travel distance when the same physical channel is selected in the previous scan is The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the selected physical channel is selected by the tuner unit when the threshold is equal to or greater than a threshold value. The digital broadcast receiving method according to any one of 12 to 15. Using the time management unit that manages the time,
In the channel information update step, time information is acquired by the time management unit when scanning is started,
Even when the selected physical channel is stored in the channel information storage unit, when the difference between the time when the previous scan was started and the time when the current scan was started is greater than or equal to the threshold value The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner unit. The digital broadcast receiving method according to the item. Using the time management unit that manages the time,
In the channel information update step, time information is acquired every time a physical channel is selected by the tuner unit,
Even when the selected physical channel is stored in the channel information storage unit, the difference between the time obtained when the physical channel is selected and the time when the same physical channel is selected in the previous scan. The channel information in the channel information storage unit is updated by performing the extraction process by the stream processing unit in a state where the physical channel is selected by the tuner unit when the channel is equal to or greater than a threshold value. 16. The digital broadcast receiving method according to any one of items 1 to 15. The tuner unit is a first tuner unit,
A second tuner unit that selects a physical channel and acquires a digital broadcast stream transmitted on the selected physical channel; program identification information and a program included in the digital broadcast stream acquired by the second tuner unit Further using a demultiplexing unit for extracting sequence information,
While outputting video and audio of digital broadcasting using the second tuner and the demultiplexer and the video and audio output unit, the channel information stored using the first tuner section and the stream processing unit The digital broadcast receiving method according to any one of claims 12 to 21, wherein channel information of a part is updated.

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