JP5132186B2 - Digital broadcast receiver - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus that can be mounted on a mobile body.

  In a conventional digital broadcast receiving apparatus, information relating to a program of a broadcast station that was viewed before the reception level was lowered and a program currently being broadcast by another broadcast station has not been transmitted or has not been transmitted. However, since the digital broadcast receiver did not use the information, even if you want to continue watching the program that you were watching before the reception level dropped, Therefore, the viewer himself had to select a program.

  As a measure to improve this, when the reception level drops and the program cannot be watched, the tuner unit is automatically controlled to scan the entire frequency band to search for another receivable broadcasting station, and to receive a receivable broadcast. If there is a station, the affiliated station information to which the broadcast station belongs is acquired from the program information broadcast by the broadcast station. I try to select a broadcasting station. (For example, see Patent Document 1 and Claim 1)

JP-A-2004-140690 (Claim 1, FIG. 1)

  However, in the above improvement measures, when the reception level is lowered and the program viewing cannot be continued, the tuner is automatically controlled every time and the entire frequency band is scanned to search for affiliate stations, so the program viewing is interrupted. There is a disadvantage of long time.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a digital broadcast receiver capable of automatically selecting the same program as a program whose reception level is lowered and the program viewing cannot be continued without scanning the frequency band in a short time. There is.

In order to solve the above problems, the first aspect of the present invention extracts a tuner unit that selects a transport stream from a broadcast wave, and extracts video / audio information from the transport stream that is selected by the tuner unit. A demultiplexing unit, a video / audio decoding unit that decodes the video / audio information, a transport that is being selected based on information obtained from the tuner unit, the demultiplexing unit, and the video / audio decoding unit A reception failure detection unit that detects whether or not the reception state of the stream is unreceivable, a frequency list database unit that stores a correspondence relationship between each affiliated station and a transport stream broadcast by each affiliated station, and the reception failure detection Each unit station with reference to the correspondence stored in the frequency list database unit when the unit detects no reception. Among the transport stream to be broadcast, in which and a channel selection processing unit for selecting a transport stream of affiliate channels transport stream became the unreceivable preferentially to the tuner unit. The correspondence relationship includes a correspondence relationship between each transmitting station and a transport stream identification of a transport stream transmitted from the transmitting station and a physical channel, and the channel selection processing unit is received by the reception inability detecting unit. In the case of detecting the non-permission, referring to the correspondence relationship of the frequency list database unit, based on the transport stream identification and physical channel of the non-reception transport stream, With reference to a transmitting station specifying unit for receiving that specifies a transmitting station that has been transmitting and a predetermined neighboring transmitting station database unit that stores neighboring transmitting station information, the transmitting station specifying unit that is specified by the transmitting station specifying unit for receiving The neighboring transmitting stations in the neighborhood are identified, and the transport list that has become unreceivable is selected from them. A neighboring transmitting station extracting unit that extracts a neighboring transmitting station that transmits a transport stream of the same affiliated station as the channel, and the tuner transmitting the transport stream transmitted from the neighboring transmitting station extracted by the neighboring transmitting station extracting unit. A channel selection control unit that causes the unit to select a channel.

  According to the first aspect of the present invention, when the selected transport stream (program) becomes unreceivable, the frequency list database unit is referred to, and the transport stream broadcast by each affiliated station Since the transport stream of the same affiliated station as the transport stream that has become unreceivable is preferentially selected, the same program as the unreceivable program can be automatically and quickly scanned without scanning the frequency band. You can tune in.

Embodiment 1 FIG.
The digital broadcast receiving apparatus according to this embodiment downloads and stores a frequency list including frequency information of each broadcasting station, and when the program being viewed becomes unreceivable, the digital broadcast receiving apparatus is based on the stored frequency list. Identifies the transmitting station that was transmitting the program that could not be received, and is the same as the broadcast station that was broadcasting the disabled program among the programs transmitted from neighboring transmitting stations adjacent to the transmitting station The program transmission interruption time is shortened by selecting a program transmitted from a broadcasting station having an affiliated station relationship according to the channel selection priority.

  As shown in FIG. 1, the digital broadcast receiving apparatus includes an antenna 113, a tuner unit 100, a demultiplexing unit 101, a video / audio decoding unit 102, a video display unit 103, an audio output unit 104, and a frequency. A list acquisition unit 105, a frequency list database unit 106, an unreceivable detection unit 107, a nearby transmission station database unit 110, and a channel selection processing unit 112 are provided.

  The tuner unit 100 performs channel selection, demodulation, and error correction on the digital broadcast (broadcast wave) received by the antenna 113, extracts a transport stream corresponding to a desired program, and outputs the transport stream to the demultiplex unit 101. . The tuner unit 100 also notifies the reception failure detection unit 107 of reception level of received signals, C / N, PLL lock information, frame lock information, error rate information, and the like as reception failure detection information.

  The demultiplexing unit 101 extracts program information and the like from the PSI information (Proguramu Specific Information: program specification information) and SI information (Service Information: program information) included in the transport stream from the tuner unit 100. Save to a predetermined memory. Then, the demultiplexing unit 101 acquires the PID value of the video / audio packet (video / audio information) from the extracted PSI information and SI information, performs the filtering of the video / audio packet based on each PID value, The video / audio packet is output to the video / audio decoding unit 102.

  The demultiplexing unit 101 cannot receive a PAT disruption notification and a PMT disruption notification when section information such as a PAT (Program Association Table) and a PMT (Program Map Table) does not arrive at a predetermined time interval. The reception failure detection unit 107 is notified as detection information.

  In addition, the demultiplexing unit 101 detects a synchronization byte for every 188 bytes in the transport stream from the tuner unit 100, and if not detected, if not detected, a notification to that effect (synchronous lost notification) is received non-reception detection information. To the unreceivable detection unit 107. Furthermore, when the demultiplexing unit 101 detects a discontinuity of the continuity counter value present in the header of the transport packet, the demultiplexing unit 101 uses the notification (packet lost notification) as notification indicating that the reception is not possible. 107 is notified.

  Further, the demultiplexing unit 101 extracts a frequency list of each region included in the transport stream from the tuner unit 100 and outputs (downloads) the frequency list to the frequency list acquisition unit 105. This output is performed, for example, when there is a request for the output from the frequency list acquisition unit 105 and when the content of the frequency list is updated.

  The video / audio decoding unit 102 decodes the audio / video packet from the demultiplexing unit 101, outputs the video packet to the video display unit 103 to display the video, and outputs the audio packet to the audio output unit 104. Voice output.

  When the video / audio decoding unit 102 detects a decoding error, the video / audio decoding unit 102 notifies the reception failure detection unit 107 of an error notification or error rate as reception failure detection information.

  The frequency list acquisition unit 105 downloads the frequency list of each area included in the digital broadcast via the demultiplexing unit 101 and stores the information therein in the frequency list database unit 106. This storage is performed by a nonvolatile memory. This download is performed when the frequency list database unit 106 is empty, and when the contents of the frequency list are updated (for example, when a transmitting station is newly added or abolished, or when a transmitted frequency is changed). Etc.

  The above information stored in the frequency list database unit 106 includes at least correspondence between each affiliated station (ie, each affiliated station identification) and a transport stream (ie, transport stream identification) broadcast by each affiliated station, And the correspondence between each transmitting station (that is, each transmitting station identification) and the transport stream identification and the physical channel of the transport stream transmitted from the transmitting station.

  Here, in more detail, the above information stored in the frequency list database unit 106 is as shown in FIG. The area identification in the figure is an identification value indicating a service area. The transport stream identification is an identification value for identifying a digital broadcast transport stream, and these identification values are generally broadcast station units in the terrestrial (ISDB-T). The affiliated station identification is an identification value for indicating that the broadcasting station is affiliated with the affiliated station, and the transmitting station identification is an identifying value for identifying the transmitting station that transmits the transport stream. Is the postal code of the point where the transmitting station exists, the physical channel is the physical channel number of the transport stream transmitted from the transmitting station, and the transmission output is the transmission output value when output from the transmitting station. The channel selection priority indicates the channel selection priority when there are a plurality of transport streams having the same affiliated station identification.

  As shown in FIG. 2, in the frequency list database unit 106, the above information is stored in association with each area identification. Further, the above information is stored in association with each transport stream identification and affiliated station identification under each region identification. In addition, the above information is related to each transmission station information (transmission station identification, transmission station postal code, physical channel, transmission output, and channel selection priority) under each transport stream identification and affiliated station identification. Has been saved.

  Based on the above-described reception disable detection information from the tuner unit 100, the demultiplexing unit 101, and the video / audio decoding unit 102, the reception disable detection unit 107 cannot receive a program that is currently being received or immediately before reception is disabled (hereinafter, these If the state is not collectively received), the notification of the determination result (notification of channel selection result) is notified to the channel selection control unit 111, and in particular when it is determined that reception is impossible A notification to that effect (notice of reception failure detection) is sent to the transmitting station identification unit 108 during reception.

  In this reception impossibility detection notification, information such as the transport stream identification and the physical channel of the program (transport stream) that was being viewed at that time is notified to the transmitting station specifying unit 108 during reception.

  When the channel selection processing unit 112 acquires the above-described reception failure detection notification from the reception failure detection unit 107 (that is, when the reception failure detection unit 107 detects reception failure), the channel selection processing unit 112 stores the above-described reception stored in the frequency list database unit 106. Referring to the information (correspondence relationship), the transport stream of the same affiliated station as the transport stream that cannot be received during channel selection is given priority among the transport streams (programs) broadcast by each affiliated station The tuner unit 100 selects a channel, and includes a transmitting station specifying unit 108, a nearby transmitting station extracting unit 109, and a channel selection control unit 111.

  When the reception failure detection unit detects reception failure, the transmission-in-transmission specifying unit 108 refers to the frequency list database unit 106, and based on the transport stream identification and physical channel of the transport stream that has been disabled to receive. The transmitting station that has transmitted the transport stream that has become unreceivable is identified.

  That is, when the transmitting transmitting station specifying unit 108 obtains the above-mentioned reception failure detection notification from the reception failure detection unit 107, it refers to the above-mentioned information stored in the frequency list database unit 106, and notifies it by the reception failure detection notification. The transport stream identification and the transmission station identification corresponding to the physical channel corresponding to the transport stream identification and the physical channel thus specified are specified.

  The transmitting transmitting station specifying unit 108 notifies the specified transmitting station identification (that is, transmitting station) to the neighboring transmitting station extracting unit 109 as receiving transmitting station information.

  The neighboring transmitting station extracting unit 109 refers to the neighboring transmitting station database unit 110, identifies neighboring transmitting stations that are in the vicinity of the transmitting station identified by the receiving transmitting station identifying unit 108, and from these, The neighboring transmitting station that transmits the transport stream of the same affiliated station as the transport stream that has become unreceivable is extracted.

  That is, the neighboring transmitting station extracting unit 109 acquires the transmitting station location postal code corresponding to the receiving station information (that is, transmitting station identification) notified from the receiving transmitting station specifying unit 108 from the frequency list database unit 106. To do. Then, the nearby transmitting station extraction unit 109 searches the nearby transmitting station database 110 and specifies a zip code (hereinafter referred to as a neighboring area zip code) in the area corresponding to the acquired transmitting station location zip code. The neighborhood transmitting station database 110 stores in advance the zip codes of the neighborhoods corresponding to the zip codes in the whole country. Then, the neighboring transmitting station extracting unit 109 searches the frequency list database unit 106 and identifies the transmitting station corresponding to the identified neighboring area zip code (that is, in the vicinity of the transmitting station that has transmitted the program that cannot be received). Identify all neighboring transmitters). Then, the neighboring transmitting station extracting unit 109 searches the frequency list database unit 106, and identifies the transport stream identification of the program (transport stream) that has become unreceivable from the transmitting station identifications of all the identified neighboring transmitting stations. All those corresponding to the transport stream identification corresponding to the same affiliated station identification are extracted.

  Then, the neighboring transmitting station extracting unit 109 searches the frequency list database unit 106, and uses each of the extracted transmitting station identifications of the neighboring transmitting station using the corresponding transport stream identification and affiliated station identification. , Information related to the transmitting station (physical channel, transmission output, channel selection priority) is identified.

  The neighboring transmitting station extraction unit 109 selects a transport stream identified by the transmitting station identification, transport stream identification, affiliated station identification, and information on the transmitting station (physical channel, transmission output, channel selection priority) as a channel selection candidate. The information is notified to the channel selection control unit 111 as information.

  The channel selection control unit 111 selects, in the tuner unit 100, the transport stream (the same transport stream as the transport stream that has become unreceivable) transmitted from the neighboring transmission station extracted by the neighboring transmission station extraction unit 109. It is something to be made. That is, the channel selection control unit 111 notifies the tuner unit 100 of a channel selection instruction, and has the highest channel selection priority (highest priority) among the above channel selection candidate information notified from the neighboring transmitting station extraction unit 109. Select a channel selection candidate).

  The channel selection control unit 111 receives the reception of the selected highest-order channel selection candidate based on the channel selection result notification notified from the reception failure detection unit 107 when the tuner unit 100 is selected. Determine whether or not. If the reception fails as a result of the determination, the channel selection control unit 111 notifies the tuner unit 100 of a channel selection instruction, and has the next rank in the channel selection candidate information (next rank channel selection candidate). Tune in. In this way, the channel selection control unit 111 selects the channel selection candidates in the channel selection candidate information according to the channel selection priority order until the selected channel selection candidate is successfully received.

  If the selected channel selection candidate is successfully received as a result of the above determination, the channel selection priority of the transmitting station (neighboring transmitting station) transmitting the channel selection candidate (transport stream) is the same. It changes to the highest rank among the transmitting station identifications corresponding to the transport stream identification corresponding to the affiliated station identification. Thereafter, the changed channel selection priority order is followed.

  In addition, the channel selection control unit 111 causes the tuner unit 100 to scan the entire range of the frequency band if there is no reception success even if all the channel selection candidates in the channel selection candidate information are selected. A transport stream having the same identification is selected.

  Next, the operation of the digital broadcast receiving apparatus will be described with reference to FIG.

  When the digital broadcast is received by the antenna 113, the tuner unit 100 selects a desired transport stream (program) from the digital broadcast, and the demultiplex unit 101 selects the selected transport stream. The video packet and the audio packet are extracted from the video packet, and the video packet is output to the video display unit 103 via the video / audio decoding unit 102 for video display. On the other hand, the audio packet is transmitted to the video / audio decoding unit 102. To the audio output unit 104 and output as audio.

  At that time, in the demultiplexing unit 101, when the selected transport stream includes an update of the frequency list of each region, or when there is a request (frequency list download request) from the frequency list acquisition unit 105 Outputs the frequency list of each region included in the selected transport stream to the frequency list acquisition unit 105, and causes the frequency list acquisition unit to store information in the frequency list in the frequency list database unit 106.

  At that time, the reception disable detection information is output from the tuner unit 100, the demultiplexing unit 101, and the video / audio decoding unit 102 to the reception disable detection unit 107. Based on this, the reception state (whether or not reception is possible) of the selected transport stream is monitored.

  When the reception failure detection unit 107 detects that reception is not possible (that is, the reception of the selected transport stream has been disabled), the reception failure detection unit 107 notifies the receiving transmitting station specifying unit 108 to that effect. Notification (not-receiveable detection notification: this notification includes information such as a transport stream identification and a physical channel regarding the transport stream being selected) is notified.

  Note that the above-mentioned reception failure is, for example, when the digital broadcast receiving apparatus is mounted on a mobile body such as a vehicle or a portable terminal, and the mobile body moves and moves out of the area of the receiving broadcast station. Or due to the effects of ground structures.

  The receiving station identifying unit 108 refers to the frequency list database unit 106 based on information such as the transport stream identification and physical channel included in the notification, and transmits the transport stream being selected. The transmitting station identification of the transmitting station is identified, and the identification result is notified to the nearby transmitting station extracting unit 109 as transmitting station information during reception.

  Then, the neighboring transmitting station extraction unit 109 refers to the neighboring transmitting station database 110 based on the transmitting station information being received, and transmits a transmitting station in the vicinity of the transmitting station that transmitted the selected transport stream (neighboring transmission). ) Is identified. Then, among the transmitting station identifications of these neighboring transmitting stations, the one corresponding to the transport stream identification corresponding to the same affiliated station identification as the transport stream being selected is specified. Then, the frequency list database unit 106 is searched, and for each of all of the identified transmitting station identifications, based on the corresponding transport stream identification and affiliated station identification, information on the transmitting station corresponding to the identification ( The physical channel, transmission output, and channel selection priority) are identified, and the transformer identified by the transmission station identification, transport stream identification, affiliated station identification, and information about the transmission station (physical channel, transmission output, channel selection priority) The port stream is notified to the channel selection control unit 111 as channel selection candidate information.

  Upon receiving the notification, the tuner control unit 111 controls the tuner unit 100 to select the highest channel selection priority (highest channel selection candidate) among the above channel selection candidate information.

  At that time, the reception failure detection unit 107 monitors the reception status of the selected highest-order channel selection candidate based on the reception failure detection information output from the tuner unit 100, and the monitoring result is selected. The channel selection control unit 111 is notified as a station result notification.

  Then, the channel selection control unit 111 determines whether reception of the selected highest-order channel selection candidate has failed based on the notification of the channel selection result. If the reception fails as a result of the determination, the tuner unit 100 is controlled to select the next rank in the channel selection candidate information (next rank channel selection candidate). Then, until the selected channel selection candidate is successfully received, the channel selection candidates in the channel selection candidate information are selected according to the channel selection priority. If the selected channel selection candidate has been successfully received, the channel selection priority of the transmitting station transmitting the channel selection candidate (transport stream) is the transport stream identification corresponding to the same affiliated station identification. It is changed to the highest rank in the transmitting station identification corresponding to. In addition, if there is nothing that can be successfully received even if all the channel selection candidates in the above channel selection candidate information are selected, the tuner unit 100 is controlled to scan the entire frequency band and select the initial channel. The transport stream corresponding to the same affiliated station identification as the transport stream that has been selected is selected.

  According to the digital broadcast receiving apparatus configured as described above, each affiliated station broadcasts by referring to the frequency list database unit 106 when the transport stream (program) being selected cannot be received. Of the transport streams, the transport stream of the same affiliated station as the transport stream that cannot be received is preferentially selected, so the same program as the program that cannot be received without scanning the frequency band. You can automatically tune in a short time.

  In addition, since the contents of the corresponding relationship stored in the frequency list database unit 106 are updated by being downloaded, it is possible to flexibly cope with the addition or abolition of the transmitting station and the change of the transmission frequency.

  Also, when the selected transport stream (program) becomes unreceivable, the frequency list database unit 106 is referred to, based on the transport stream identification and physical channel of the transport stream that has become unreceivable, The transmitting station that has transmitted the transport stream that has become unreceivable is identified, the neighboring transmitting station database unit 110 is referred to, the neighboring transmitting stations that are in the vicinity of the identified transmitting station are identified, and those transmitting stations are identified. Since the neighboring transmitting station that transmits the transport stream of the same affiliated station as the transport stream that has become unreceivable is extracted from the inside, and the transport stream that the extracted neighboring transmitting station transmits is selected, the reception is performed. Can select the same program as the program that has been disabled with a very high probability and select in a short time Kill.

  In addition, by referring to the neighboring transmitting station information in which the distance between each transmitting station is databased from the transmitting station postal code, it is in the vicinity of the transmitting station that was transmitting the transport stream that was disabled during channel selection. Therefore, it is possible to quickly identify a nearby transmitting station that is likely to transmit the same transport stream.

  In addition, when a plurality of neighboring transmitting stations are extracted, the one having the highest channel selection priority is selected in order from the transport stream (program) to be transmitted. Even when the receivable broadcast stations are frequently alternated as in the case of moving between areas, it is possible to select the same program as the program that cannot be received in a short time.

  In addition, since the tuning priority of neighboring transmitting stations that transmit the transport stream that can be received first is changed to be the highest among those neighboring transmitting stations, it is possible to receive when the second and subsequent receptions are impossible. The program can be selected at the first channel selection (that is, in a short time).

1 is a block diagram of a digital broadcast receiving device according to Embodiment 1. FIG. 6 is a diagram illustrating an example of information stored in a frequency list database unit in the first embodiment. FIG.

Explanation of symbols

  100 tuner unit, 101 demultiplexing unit, 102 video / audio decoding unit, 103 video display unit, 104 audio output unit, 105 frequency list acquisition unit, 106 frequency list database unit, 107 unreceivable detection unit, 108 transmitting station Identifying unit, 109 Neighboring transmitting station extracting unit, 110 Neighboring transmitting station database unit, 111 Tuning control unit, 112 Tuning processing unit, 113 Antenna

Claims (3)

A tuner unit that selects a transport stream from a broadcast wave;
A demultiplexing unit for extracting video / audio information from the transport stream selected by the tuner unit;
A video / audio decoding unit for decoding the video / audio information;
Based on information obtained from the tuner unit, the demultiplexing unit, and the video / audio decoding unit, a reception disable detection unit that detects whether or not the reception state of the selected transport stream is unreceivable;
A frequency list database section storing the correspondence between each affiliated station and the transport stream broadcast by each affiliated station;
When the reception disable detection unit detects the reception disable, the correspondence that is stored in the frequency list database unit is referred to, and the transport stream broadcast by each affiliated station is disabled. A channel selection processing unit that preferentially selects a transport stream of the same affiliated station as the port stream to the tuner unit;
Equipped with a,
The correspondence relationship includes a correspondence relationship between each transmission station and a transport stream identification of a transport stream transmitted from the transmission station and a physical channel,
The channel selection processing unit
When the reception failure detection unit detects reception failure, it refers to the correspondence relationship in the frequency list database unit, and based on the transport stream identification and physical channel of the transport stream that has become reception disabled, A receiving station identifying unit that identifies the transmitting station that was transmitting the transport stream that became
Referring to a predetermined neighboring transmitting station database unit storing neighboring transmitting station information, identify neighboring transmitting stations in the vicinity of the transmitting station identified by the transmitting transmitting station identifying unit, and from among them, A neighboring transmitter extracting unit that extracts a neighboring transmitter that transmits a transport stream of the same affiliated station as the transport stream that has become unreceivable;
A tuning control unit that causes the tuner unit to tune the transport stream transmitted from the neighboring transmitting station extracted by the neighboring transmitting station extracting unit;
Digital broadcast receiving apparatus according to claim Rukoto equipped with. The neighboring transmitting station information is a database of distances between transmitting stations from the transmitting station address postal code,
The neighboring transmitting station extractor, the reference to neighboring transmitting station information, to claim 1, wherein the identifying the neighboring transmitting station located near the identified transmitting station by the receiver during the transmitting station specifying unit The digital broadcast receiver as described. Each neighboring transmitting station extracted by the neighboring transmitting station extraction unit is associated with a tuning priority,
In the case where the neighboring transmitting station extracting unit extracts a plurality of neighboring transmitting stations, the tuning control unit, in order from the transport stream transmitted by the highest channel selection priority among them, to the tuner unit in order The channel selection priority is changed so that the channel selection priority of a neighboring transmitting station that transmits a transport stream that has been received is the highest among them. The digital broadcast receiver according to claim 1 or 2 .

Images