JP5627364B2 - Digital broadcast receiver - Google Patents

Description

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

  As a conventional digital broadcast receiver that can be mounted on a mobile unit, navigation is performed so that viewers do not have to manually select a channel that broadcasts the same program when they move away from the reception broadcast area. The current position information was acquired from the system, the broadcast reception range information stored in the memory in advance was compared with the current position information, the broadcast station in the receivable range was searched in the memory, and it was received until just before A digital broadcast receiving apparatus that automatically searches for the same program is proposed (Patent Document 1).

  Since the above-described apparatus uses a global positioning system (GPS) to detect the current position, it is necessary to cooperate with a navigation system, which increases the cost of the device.

  Therefore, it does not have GPS, it has storage means for affiliated station transmission frequency for each region, the reception status detection means detects the deterioration of the reception status, searches for affiliated stations, and at that time broadcast waves that are not broadcast waves from affiliated stations An apparatus has also been proposed in which information indicating the transmission source area is acquired from a broadcast wave, and if an affiliated station in this area exists in the storage means, the station is selected (Patent Document 2).

JP 2001-285101 A JP 2007-235434 A

  In the above-described apparatus, when a broadcast wave from a station other than the affiliated station to be searched is received, the transmission source area information is acquired from the broadcast wave, and the affiliated station channel in the acquired area is searched from the storage means. The searched affiliated channel is searched.

  Usually, in an affiliated station channel in a region, there are a plurality of affiliated station candidates because the relay station exists. In recent years, as the coverage area of terrestrial digital broadcasting has increased, a large number of relay stations have been present. Therefore, even if an area can be specified by the above method, there is a problem that it is necessary to perform a search for affiliated station candidates in the area, which requires a search time.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a digital broadcast receiving apparatus capable of reducing the time required for searching for relay stations and affiliated stations in an environment where a large number of affiliated stations and relay stations exist.

A digital broadcast receiving apparatus according to one embodiment of the present invention includes:
A tuner / demodulator that demodulates the broadcast wave transmitted from the transmitting station to obtain a broadcast signal;
Transmission group list storage means for storing a transmission group list in which the broadcast wave identification information, the physical channel and the broadcast target area of the broadcast wave are associated with the transmission station identification information;
Channel selection candidate extracting means for referring to the transmission group list and generating a search order list that narrows down the channel selection candidates only to the broadcast target area of the broadcast wave that has been received and the channels of broadcast stations in the adjacent area;
In a digital broadcast receiving apparatus comprising: a tuning control unit that instructs the tuner / demodulating unit to select a channel according to the search order list;
Transmitting station estimation means for searching the transmission group list storage means from the broadcast wave identification information of the broadcast wave received during the search and its received physical channel, and estimating the transmitting station transmitting the broadcast wave being received Prepared,
The channel selection candidate extracting means updates the search order list so that the physical channel transmitted by the estimation transmitting station is preferentially searched.

Another aspect of the present invention is a digital broadcast receiver.
A tuner / demodulator that demodulates the broadcast wave transmitted from the transmitting station to obtain a broadcast signal;
Transmission group list storage means for storing a transmission group list in which broadcast wave identification information, physical channel, affiliated station identification information of the broadcast wave is associated with transmitting station identification information;
Channel selection candidate extracting means for acquiring a physical channel of a relay station or affiliated station corresponding to the broadcast wave that has been viewed so far from the transmission group list storage means using the affiliated station identification information and generating a search order list When,
A reception status deterioration determining means for detecting a deterioration in the reception status of the physical channel being received;
In a digital broadcast receiving apparatus comprising: a tuning control unit that instructs the tuner / demodulating unit to select a channel according to the search order list when the viewing state deteriorates.
Transmitting station estimation means for searching the transmission group list storage means from the broadcast wave identification information of the broadcast wave received during the search and its received physical channel, and estimating the transmitting station transmitting the broadcast wave being received Prepared,
Upon receiving the broadcast waves nor broadcast waves of the broadcast waves even affiliated station relay station corresponding to a broadcast wave has been received before the search begins during the search, the channel selection candidate extracting means stores the transmission group list Referring to means, if it is determined that the transmitting station which is estimated to be transmitted through the said received broadcast wave is not sending a broadcast wave of the relay stations and affiliated stations, the station selection candidate extracting means The search target is narrowed down to broadcasting stations that belong to the estimated transmitting station and neighboring areas.
A digital broadcast receiver according to still another aspect of the present invention is provided.
A tuner / demodulator that demodulates the broadcast wave transmitted from the transmitting station to obtain a broadcast signal;
Transmission group list storage means for storing a transmission group list in which broadcast wave identification information, physical channel, affiliated station identification information of the broadcast wave is associated with transmitting station identification information;
The channel selection candidate extracting means for acquiring the physical channel of the relay station or affiliated station corresponding to the broadcast wave received so far from the transmission group list storage means, and generating a search order list;
A reception status deterioration determining means for detecting a deterioration in the reception status of the physical channel being received;
In a digital broadcast receiving apparatus comprising: a tuning control unit that instructs the tuner / demodulating unit to select a channel according to the search order list when the viewing state deteriorates .
Transmitting station estimation means for searching the transmission group list storage means from the broadcast wave identification information of the broadcast wave received during the search and its received physical channel, and estimating the transmitting station transmitting the broadcast wave being received Prepared,
Upon receiving the broadcast waves nor broadcast waves of the broadcast waves even affiliated station relay station corresponding to a broadcast wave has been received before the search begins during the search, the channel selection candidate extracting means stores the transmission group list Referring to means, if it is determined that the transmitting station which is estimated to be transmitted through the said received broadcast waves broadcast wave is being transmitted in the relay station or affiliate channels, the station selection candidate extracting means A search order list is generated so that the channel selection order of the affiliated station / relay station is first.

  According to the present invention, a current position specifying means such as GPS is not required, and a dedicated tuner for searching for relay stations and affiliated stations is also unnecessary, so that it can be configured at low cost, and further, a search order list of relay stations and affiliated stations. It is possible to automatically search for relay stations and affiliated stations in a short time by making a search according to the generated and effectively using the broadcast wave information received in the search process for estimating the transmitting station. It can be carried out.

It is a block diagram which shows the structure of the digital broadcast receiver which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the frequency list downloaded according to Embodiment 1 of this invention. It is a figure which shows the structure of the transmission group list | wrist produced | generated according to Embodiment 1 of this invention. It is a figure which shows the operation | movement flow of the broadcast reception process which operate | moves according to Embodiment 1 of this invention. It is a figure which shows the operation | movement flow of a relay station and an affiliated station search which operate | moves according to Embodiment 1 of this invention. It is a figure which shows the production | generation method of the search order list produced | generated according to Embodiment 1 of this invention. It is a figure which shows the search order list produced | generated in Embodiment 1 of this invention. It is a figure which shows the broadcast area and travel route for demonstrating the operation example of Embodiment 1 of this invention. It is a figure which shows the transmission group list | wrist produced | generated according to Embodiment 1 of this invention. It is a figure which shows the transmission channel number of NHK synthesis | combination of the Osaka circumference area, and the number of transmission channels for demonstrating the operation example of Embodiment 1 of this invention. It is a figure which shows an example of the search order list produced | generated in Embodiment 1 of this invention. It is a figure which shows the broadcast wave and its physical channel transmitted from the transmitting station with the transmitting station ID of 0x31165 for demonstrating the operation example of Embodiment 1 of this invention. It is a figure which shows the physical channel searched until it received the affiliated station at the time of operating according to Embodiment 1 of this invention, and operation | movement. It is a figure which shows the structure of the transmission group list | wrist produced | generated according to Embodiment 2 of this invention. It is a figure which shows the production | generation method of the search order list produced | generated according to Embodiment 2 of this invention. It is a figure which shows the production | generation method of the search order list produced | generated according to Embodiment 3 of this invention. It is a figure which shows the structure of the transmission group list | wrist produced | generated according to Embodiment 4 of this invention. It is a figure which shows the production | generation method of the search order list produced | generated according to Embodiment 4 of this invention. It is a figure which shows the production | generation method of the search order list produced | generated according to Embodiment 4 of this invention. It is a block diagram which shows the structure of the digital broadcast receiver which concerns on Embodiment 5 of this invention.

Embodiment 1 FIG.
FIG. 1 is a block diagram schematically showing a configuration of a digital broadcast receiving apparatus according to an embodiment of the present invention.
The illustrated digital broadcast receiving apparatus includes a tuner / demodulator 101, a demultiplexer 102, a video / audio decoder 103, a transmission group list generator 104, a transmission group list storage 105, a reception status determination unit 106, and channel selection candidate extraction. Unit 107, transmitting station estimation unit 108, channel selection control unit 109, and memory 110.

  The tuner / demodulator 101 receives a digital broadcast wave via the antenna 100, performs demodulation processing and error correction, and outputs the resulting digital broadcast signal to the demultiplexer 102. The format of this digital broadcast signal differs depending on the broadcasting system. Here, a case where the stream is composed of a transport stream (TS) will be described, but a broadcasting system using other than TS may be used.

The tuner / demodulator 101 also detects information indicating the reception status such as the received electric field strength and the bit error rate and outputs the information to the reception status determination unit 106.
The tuner / demodulator 101 may have a configuration in which two antennas 100 are provided and connected to the antenna 100 to receive diversity and output one TS.

  The demultiplexing unit 102 demultiplexes the broadcast signal obtained by demodulation to obtain an AV stream and PSI / SI (Program Specific Information / Service Information). That is, the demultiplexing unit 101 separates the video and audio data of a specific service from the TS constituting the broadcast signal obtained by demodulation, and outputs it to the video / audio decoding unit 103. The video / audio decoding unit 103 The audio compression data is decoded, and video and audio are displayed and output, respectively.

The demultiplexing unit 102 further extracts information about the broadcast network to which the TS belongs, information about the TS, and service information included in the TS from the received TS.
As broadcast network information, Network_ID, which is network identification information (identification value), and the transmission frequency (physical channel) of the master station and relay station existing in the network are extracted from the network information table (NIT) included in the TS. To do.

  As TS information, TS_ID (transport_stream_id), which is identification information of the TS, is extracted from NIT or PAT (Program Association Table) included in the TS. In the ISDB-T system, as a TS information, an affiliated station ID (affiliation_id) indicating an affiliated station to which the received TS belongs is acquired from a BIT (Broadcaster Information Table) included in the TS.

  Further, area identification information indicating which area the network to which the TS belongs is broadcast is extracted from the NIT included in the TS. As the service information, SVC_ID (service_id), which is identification information of each service included in the TS, is extracted from SDT (Service Description Table). These broadcast network information, TS information, and service information are stored on the memory 110 as currently received broadcast wave information.

  Note that TSs having the same affiliated station ID value each belong to the same affiliated broadcasting station, indicating that there is a possibility that the same program is being performed.

  Furthermore, in the ISDB-T system, a frequency list storing information on TS broadcasted throughout Japan is transmitted by broadcast waves, and the demultiplexing unit 102 downloads the frequency list.

The structure of this frequency list is shown in FIG. As shown in FIG. 2, the frequency list includes, for each area identification information, the TS_ID of the TS transmitted in the area specified by the area identification information, the affiliated station ID that identifies the affiliated station to which each TS belongs, A transmitting station ID, which is identification information of a transmitting station to which the TS is transmitted, a physical channel number to be transmitted, and transmission power (dbm) are stored.
The “region” mentioned here may be a region (prefecture region) corresponding to a city, road, prefecture or prefecture, or may be a region composed of a plurality of cities, roads, prefectures and / or prefectures. Can be part of a road, prefecture or prefecture.

When the demultiplexing unit 102 downloads the frequency list (FIG. 2), the demultiplexing unit 102 outputs the frequency list to the transmission group list generation unit 104.
The transmission group list generation unit 104 can shorten the time required to obtain information on each TS transmitted at each transmitting station so that information on each TS transmitted at each transmitting station can be obtained immediately. A transmission group list is generated (as shown in FIG. 3) and stored in the transmission group list storage unit 105 as broadcast wave information.

The table structure of the transmission group list stored in the transmission group list storage unit 105 is shown in FIG.
As shown in FIG. 3, the transmission group list is a grouping of IDs (TS_IDs) of TSs broadcasted in each area for each area identification information, grouped by transmitting station. Furthermore, the physical channel number of each TS transmitted from each transmitting station and the affiliated station ID for specifying the affiliated station to which each TS belongs are stored in a table format.

The operation of the digital broadcast receiving apparatus according to the present embodiment will be described with reference to FIG. 4, FIG. 5, and FIG.
The broadcast reception process S100 of FIG. 4 is started immediately when an instruction to start broadcast reception is generated. When the broadcast reception process S100 is started, the transmission group list is generated and transmitted by the transmission group generation unit 104 such as the extraction of broadcast network information by the demultiplexing unit 102 while the program reception process S101 is being performed. The reception status determination unit 106 determines whether the reception status is maintained in a good state or has deteriorated. For example, the reception status determination unit 106 receives the reception power and the bit error rate from the tuner / demodulation unit 101. The reception status determination unit 106 also receives information on whether or not the data that should arrive regularly detected by the demultiplexing unit 102 has been interrupted. For example, in the case of the ISDB-T method, the demultiplexing unit 102 performs monitoring of disruption of the PAT and PMT transmitted every 100 ms, and notifies the reception status determination unit 106 of the monitoring result.
The reception status determination unit 106 further receives the decoding error rate information detected by the video / audio decoding unit 103.

  The reception status determination unit 106 determines whether the reception status is deteriorated or the reception is impossible from the information indicating the reception status (S102).

  When it is determined that the reception status deteriorates and the channel of the relay station or affiliated station to be replaced should be switched (Yes in S102), the reception status deterioration notification is output to the channel selection candidate extraction unit 107 (S103).

  When the channel selection candidate extraction unit 107 receives the reception status deterioration notification, the channel selection candidate extraction unit 107, the channel selection control unit 109, the tuner / demodulation unit 101, the demultiplexing unit 102, and the reception status determination unit 106, the relay station The affiliated station search is automatically executed (S104). Details thereof will be described later with reference to FIG.

If the relay station / affiliated station can be detected as a result of this search, among the services included in the TS belonging to the detected relay station / affiliated station, the video / audio of the same service that has been received in step S101 so far Decode, display and audio output.
This decoding is performed by the video / audio decoding unit 103, and the above “display and audio output” is performed by outputting the decoded data as video and audio output.
The identity is determined by using the service name that is the service information of the received TS, the SVC_ID, or the similarity of the program name that is the program information (S105).

  The relay station / affiliated station search (S104) performed when the channel selection candidate extraction unit 107 receives the reception condition deterioration notification will be described in more detail with reference to FIG.

  The channel selection candidate extraction unit 107 receives the reception status deterioration notification, starts a relay station / affiliated station search (S200), and first generates a search order list (S201).

  In general, there are a plurality of physical channels through which broadcast waves of broadcast waves being received and broadcast waves of affiliated stations are transmitted. Among these, a list (a list indicating the order in which physical channels are to be searched) for searching in descending order of possibility of reception is a search order list, and the channel selection candidate extraction unit 107 stores in the transmission group list storage unit 105. With reference to the stored transmission group list, for example, the physical channel of the relay station or affiliated station transmitted from the transmitting station estimated by the transmitting station estimation unit 108 is acquired, and the physical channel (physical channel of the relay station or affiliated station is acquired). ) To generate a search order list with the highest priority on channel selection.

  A specific search order list generation method is shown in the flowchart of FIG. The outline of the procedure for generating the search order list is as follows. First, a list is generated with a relay station in the area to which the broadcast wave received so far belongs as the first priority group, and then a list with an affiliated station in the adjacent area as the second priority group. Then, a search order list is generated so that the second priority group is selected after the first priority group. In this way, by generating a search order list in which channel selection candidates are narrowed down only to the channels of the relay station in the broadcast target area of the received broadcast wave and the affiliated station in the adjacent area, as described below The search time can be shortened.

  Details of the search order list generation will be described below with reference to FIG. When the generation of the search order list is started (S300), first, in step S301, the area to which the broadcast wave received so far belongs is identified as area A from the area identification information described in the NIT.

  Next, in step S302, relay station information that identifies relay stations belonging to area A is extracted. This extraction may be acquired from the frequency information of the ground distribution system descriptor described in the NIT.

  Further, the region identification information, TS_ID, and affiliated station ID of the TS received so far are searched from the transmission group list stored in the transmission group storage unit 105, belong to the same regional identification information, and have the same affiliated station ID. You may search by the method of extracting TS_ID of TS (ID value is equal).

  In step S303, the relay station information extracted in step S302 is added to the first priority group. The processing in steps S302 and S303 is performed for all relay stations belonging to area A (S304). That is, in general, there are a plurality of relay stations belonging to the area A. In this case, the relay station information is sequentially added to the first priority group list until the extraction of information of all the relay stations belonging to the area A is completed. (S302, S303, S304).

  When the extraction of the information for all the relay stations belonging to the area A is completed, the relay stations stored in the first priority group list are rearranged in the order of increasing physical channel numbers in step S305.

  Next, channel selection candidates having a second priority lower than that of the first priority candidates are added to the list (S306 to S308).

  Candidates belonging to the second priority group are affiliated stations belonging to the adjacent area to the area to which the broadcast wave received so far belongs.

  In these candidate extractions, TSs that have the same affiliated station ID as the TS that has been received so far, and that belong to the area adjacent to the area to which that TS (the TS that has been received so far) belong, are stored in the transmission group. This is performed by searching from the transmission group list stored in the unit 105 (S306).

  At this time, there are generally a plurality of affiliated stations belonging to the adjacent area. In this case, the second priority group list is used to detect the affiliated station information sequentially detected until the extraction of all affiliated stations belonging to the adjacent area of the area A is completed. (S306, S307, S308).

  In step S309, the affiliated stations stored in the second priority group list are rearranged so as to be selected in ascending order of physical channel numbers.

  Finally, in step S310, the second priority group list is added next to the first priority group list, and the channel selection of the candidate in the second priority group list is performed after the channel selection of the candidate in the first priority group list. Prioritize the search order and generate a search order list.

  An example of the search order list generated in this way is shown in FIG. In the search order list shown in FIG. 7, first, the physical channels (SA-1 to SA-M) of the first priority group are arranged in the order of channel numbers, and then the physical channels (SB-1 to SB-) of the second priority group. N) are arranged in order of channel number. Although not shown in FIG. 7, TS_ID, affiliated station ID, and transmitting station ID are stored in association with each physical channel in the same manner as shown in FIG. Similarly to the case shown in FIG. 2, transmission power may be stored in association with each other.

  In the above example, the list of channel selection candidates of the second priority is generated in ascending order of physical channel numbers. However, if the area identification information is numerical information, search is made from broadcast waves in the area with the lower numerical value. Further, the channel selection priority in the second priority group list may be determined so that a plurality of channel selection candidates in the same region are searched in ascending order of physical channel numbers.

  As another method, the reception history information for each region is stored in the memory 110, and the reception time of the region to which the broadcast wave received at the time of reception is recorded on the memory 110 as the reception history information. The search channel selection priority of broadcast waves belonging to the region to which the broadcast wave belongs is made higher, and the same history information is recorded for each broadcast wave belonging to the same region, so that multiple selections within the same region are recorded. The station candidate may determine the channel selection priority in the second priority group list so that the channel selection priority of the broadcast wave received more recently becomes higher.

When the channel selection candidate extraction unit 107 can generate the search order list (S201 in FIG. 5), the channel selection candidate extraction unit 107 outputs the search order list to the channel selection control unit 109.
The channel selection control unit 109 instructs the tuner / demodulation unit 101 to perform search channel selection in accordance with the priority order described in the search order list (S202). That is, first, the top channel selection candidate in the search order list is specified, and an instruction is given to perform the search channel selection. The tuner / demodulator 101 performs tuner selection of the designated channel selection candidate.

  The reception status determination unit 106 acquires the reception status from the tuner / demodulation unit 101 and determines whether the digital broadcast signal has been locked (S203). If not locked, the channel selection control unit 109 is notified of the failure to lock (S204), and the channel selection control unit 109 designates the next channel selection candidate in the search order list to the tuner / demodulation unit 101. Instructed to perform the search channel selection (S202).

  When locked in step S203 (Yes in S203), the demultiplexing unit 102 extracts TS_ID and affiliated station ID from the SI of the received TS (S205).

  If the extracted affiliated station ID is the same as the affiliated station ID of the broadcast wave received so far (Yes in S206), the TS of the relay station or affiliated station that is the target (acquisition target) has been detected. Then, the search process is terminated (S215), and the video / audio decoding unit 103 decodes the video / audio of the same service of the detected broadcast wave and displays the video / audio (S105 in FIG. 4).

  If the affiliated station ID extracted in step S206 in FIG. 5 is not the same as the affiliated station ID of the broadcast wave received so far (No in S206), the demultiplexing unit 102 sends a TS to the transmitting station estimating unit 108. Notification that the affiliated station IDs do not match (S207).

  When receiving this notification, the transmitting station estimation unit 108 refers to broadcast wave information (physical channel, TS_ID, etc.) in the transmission group list, and estimates the transmitting station that is transmitting the received broadcast wave (S208). ).

When the received broadcast wave is different from the broadcast wave of the affiliated station to be searched, the transmitting station estimating unit 108 selects a broadcast wave in which the region identification information of the received broadcast wave, TS_ID, and the physical channel tuned at that time match. The transmission group list (FIG. 3) is detected by searching the transmission group list storage unit 105, and corresponds to the detected broadcast wave TS_ID (the detected broadcast wave TS_ID corresponds to the transmitting station ID). It is estimated that the transmitting station identified by the transmitting station ID (which matches one of TS_ID) is the transmitting station that transmits the received broadcast wave.
The transmitting station estimation unit 108 notifies the channel selection candidate extracting unit 107 of the transmitting station ID estimated in this way (S209).

  The channel selection candidate extraction unit 107 includes the broadcast wave transmitted by the estimated transmission station specified by the notified transmission station ID, which has been received so far (immediately before starting the relay station / affiliated station search). It is determined by searching the transmission group list (FIG. 3) whether there is an affiliated station ID of the received broadcast wave) (S210). ), The estimated transmitting station (transmitting station estimated from a broadcast signal corresponding to the broadcast wave received immediately before starting the relay / affiliated station search or a broadcast signal different from the affiliated station) is the relay station. Alternatively, it is determined that the broadcast wave of the affiliated station is not transmitted (No in S210), the area to which the estimated transmitting station belongs is grasped from the transmission group list in FIG. 3, and other than the broadcast wave belonging to that area and its adjacent area Broadcast wave from search order list Divided by (S214), to update the search order list.

The channel selection control unit 109 refers to the updated search order list and causes the tuner / demodulation unit 101 to perform channel selection for the next channel selection candidate described in the search order list (S202 in FIG. 5).
If there is the same affiliated station ID in step S210, that is, if the estimated transmitting station is transmitting a broadcast wave of the affiliated affiliated station (Yes in S210), the channel selection candidate extracting unit 107 uses the physical channel ( The physical channel of the affiliated station TS transmitted by the estimated transmitting station is acquired from the transmission group list (FIG. 3) (S211), and the search order list is updated so that the channel selection priority of the physical channel is the highest. .

  Then, the channel selection candidate extraction unit 107 refers to the updated search order list and instructs the channel selection control unit 109 to perform search channel selection (S212). As a result, the channel selection control unit 109 issues a tuning instruction to the tuner / demodulation unit 101.

  If the instructed physical channel is locked (Yes in S213), the broadcast wave of the intended relay station or affiliated station has been received, so the relay station / affiliated station search is terminated (S215), The video / audio of the same service is decoded and the presentation of the same program that has been received is resumed.

  If it is not locked in step S213 of FIG. 5 (No in S213), it is determined that the physical channel of the relay station or affiliated station that is determined to be transmitting by the transmitting station has not been received (No in S213). The channel selection candidate extraction unit 107, if broadcast waves other than the broadcast wave included in the area to which the transmission station estimated by the transmission station estimation unit 108 belongs and its adjacent area exist in the search order list, Are updated to a search order list in which candidates are narrowed down to those that are highly likely to be received (S214), and notified to the tuning control unit 109.

  Then, the channel selection control unit 109 causes the tuner / demodulation unit 101 to perform channel selection according to the priority of the search order list (S202).

  When the transmitting station is estimated from the search order list generated by the channel selection candidate extraction unit 107 described above and broadcast waves other than the relay station and affiliated station received in the search process, and the affiliated station exists at the estimated transmitting station The search channel selection frequency will be explained using the channels actually operated in Kansai.

  FIG. 8 is a diagram showing a broadcasting area in the vicinity of Yamashina Ward, Kyoto City. AR1 indicates the broadcast area of NHK General Osaka, and AR2 indicates the broadcast areas of NHK General Kyoto and Kansai Television. The broadcast areas of NHK General Kyoto and Kansai Television shown here are transmitted with the same power (30 dbm) from the same transmission station with a transmission station ID of 0x31165, and the broadcast areas are also almost equal.

  The bold arrows in FIG. 8 indicate that NHK Osaka, which is broadcast on channel 24 at the point PA, is received and moved in the direction of the Yamashina Ward. The section from the point PA to the point PB is moving in the broadcasting area of NHK General Osaka, but the point PB is out of this area and cannot be received. The operation according to the present embodiment at this time will be described.

  First, FIG. 9 shows a transmission group list generated by the transmission group list generation unit 104 from information on the actual frequency list downloaded by the demultiplexing unit 102 and stored in the transmission group list storage unit 105. Although only a part of information on Osaka and Kyoto related to this explanation is shown in the figure, information on the whole country is actually stored.

  The broadcast wave received at the point PA has 24 channels, the TS_ID is 0x7D70, and the affiliated station ID is 0. This information is already known by the receiver.

  When the mobile station moves to the point PB, the reception status deteriorates, and “reception status deterioration” is detected in step S102 in FIG. 4 (Yes in S102), and the channel selection candidate extraction unit 107 is notified of the reception status deterioration (S103). A relay station / affiliated station search is started (S104). First, a search order list is generated by the channel selection candidate extraction unit 107 (S201 in FIG. 5).

  In step S301 of FIG. 6, the channel selection candidate extraction unit 107 first grasps the area to which the received TS belongs.

  This can be grasped as Osaka with the area identification information “104” by referring to the area identification information described in the NIT being received.

  Then, relay station candidates existing in the area are extracted as first priority candidates (S302 to S304 in FIG. 6).

  This extraction can also be obtained by calculating each physical channel from each frequency of the relay station described in the transmission frequency field of the terrestrial distribution system descriptor described in the NIT.

  Here, a procedure for grasping from the transmission group list (FIG. 9) stored in the transmission group list storage unit 105 will be specifically described.

  In FIG. 9, since the area identification information of the received broadcast wave indicates Osaka, the area identification information part indicating “Osaka” is detected from the transmission group list, and then the TS_ID where the area identification information is Osaka is referenced. Then, a broadcast wave having the same value “0” as the TS received by the affiliated station ID is searched, and the physical channel is extracted.

  In this case, referring to FIG. 9, physical channels “24”, “50”, “27”, “29”, “46”, “42”, and “49” are extracted.

  In this embodiment, a search order list belonging to the first priority group is generated so that these physical channels are searched and selected in ascending order of physical channel numbers (S305 in FIG. 6).

  Note that channel 24 is excluded from the list because it is a broadcast wave that can no longer be received.

  That is, the search order list of the first priority group is generated in the priority order of “27”, “29”, “42”, “46”, “49”, “50”, and the search is selected in this order. It will be.

Next, in steps S306 to S309 in FIG. 6, a list is generated with the affiliated station in the adjacent area of the received TS as the second priority group, and is added to the search order list in step S310 in FIG. Since the area to which the received broadcast wave belongs is Osaka, relay stations and affiliated stations are extracted from TS included in the respective area identification information of Kyoto, Hyogo, Wakayama, and Nara in the adjacent areas.
In other words, the TS having the value “0” for the affiliated station ID of NHK Sogo Osaka that has been received is extracted.

  FIG. 9 does not show information on all these adjacent areas, but the channel numbers in which NHK synthesis is actually operated in these adjacent areas and the number of channels in each area are as shown in FIG.

Here, a search list belonging to the second priority group is generated so that these channels are searched for in ascending order of physical channel numbers.
Note that channel 24 is excluded from the list because it is a broadcast wave that can no longer be received.
Channels already registered in the first priority group are also excluded from the list.

  That is, the search list of the second priority group is “18”, “19”, “20”, “21”, “22”, “25”, “26”, “30”, “31”, “32”. , “33”, “34”, “37”, “38”, “39”, “40”, “45”, “47”, “48”, which are generated in the priority order, and these are the first priority group Is added to the search order list to be selected after the search order list. An example of the search order list generated by the above processing is as shown in FIG.

  In this way, even if the search target candidates are narrowed down to only the channels in the region with high possibility of reception from the NHK general channels nationwide, 27 types of channel candidates exist.

  Next, in step S202 of FIG. 5, the channel selection control unit 109 instructs the tuner / demodulation unit 101 to perform tuning according to the search order list.

  On the other hand, broadcast waves that can be received at the point PB are shown in FIG. As shown in FIG. 12, a receivable broadcast wave is a broadcast wave from a transmitting station (ID: 0x31165) existing in Yamashina, and its physical channels are “22”, “30”, “37”, “39”, There are seven types of channels “42”, “47”, and “49”.

  In step S206 of FIG. 5, the reception confirmation of the broadcast wave (target broadcast wave) having the same affiliated station ID as the broadcast wave that has been received (until the reception status deteriorates) is performed. The operation of the search channel selection according to is as shown in FIG.

  That is, when a relay station / affiliated station search is started in FIG. 13 (SS10), first, candidate channels of the first priority group are selected in the order of priority.

  According to the search order list, channel 27 (SS11) and channel 29 (SS12) are both determined that the tuner is not locked and there is no broadcast wave, and the next candidate channel 42 is selected (SS13).

  As a result, the tuner locks and broadcast waves can be received, and the demultiplexer 102 extracts information of TS_ID = 0x7FD4 and affiliated station ID = 4 from the broadcast waves. Since the acquired affiliated station ID is different from “0”, it can be grasped that it is not the intended relay station or affiliated station (No in S206 of FIG. 5).

  Next, the transmission group list of FIG. 9 in which the broadcast wave having the same broadcast wave TS_ID = 0x7FD4 and affiliated station ID = 4 received in step S208 of FIG. 5 is stored in the transmission group list storage unit 105 is searched.

  As a result, it can be estimated that the broadcast wave is from the transmitting station having the transmitting station ID of 0x31165 (SS14), and the same affiliated station ID transmitted from the transmitting station having the transmitting station ID of 0x31165 has the value 0 from FIG. It can be understood that the broadcast wave is transmitted (S210 in FIG. 5).

  Then, it grasps that the physical channel is “47” (SS 15), updates the search order list so that it has the highest priority (SS 16), and performs 47-channel search tuning via the tuning control unit 109 ( SS17 and S212 in FIG. 5).

  As a result, a broadcast wave of NHK General Kyoto whose intended affiliated station ID is “0” can be received (Yes in SS18 and S213 in FIG. 5).

  As described above, even if the channel selection candidates are narrowed down to the region and the adjacent region in step S201 of FIG. 5, there are 27 types of channel selection candidates as described above, and the total bandwidth (13 channels to 63 channels) is 50. Candidates could only be narrowed to about%.

  Therefore, as shown in the present embodiment, when a broadcast wave different from the affiliated station to be received is received in the search process of the relay station and affiliated station, the transmitting station to which the broadcast wave is transmitted without discarding the information, Estimate from the generated transmission group list, and if there is an affiliated station to be received among broadcast waves transmitted from the estimated transmitting station, acquire this physical channel from the transmission group list and search Since the channel is selected, the number of times the channel is selected for the search in the above example is four times of 27 channel, 29 channel, 42 channel, and 47 channel. After narrowing down candidates to 27 channel, the physical channel is simply selected. It can be seen that there is an effect that the number of search channel selections can be greatly reduced as compared with the case of channel selection in ascending order of channels. In this way, it is possible to narrow down candidates that are highly likely to be received efficiently from among a large number of relay station / affiliated station selection candidates, and it is possible to greatly reduce the time for searching for relay stations and affiliated stations.

  This means that the coverage area of multiple broadcast waves transmitted from one transmitting station (in the above example, NHK Sogo Kyoto and Kansai Television) generally tends to be in the same range, and this is used. It is a thing.

  In the digital broadcast receiving apparatus according to the first embodiment of the present invention, when the reception status of the received broadcast deteriorates or cannot be received, it is received from the transmission group list in which the information for the whole country is stored. Narrowing down the candidates for search selection to the relay stations in the broadcast target area of the broadcast wave and the affiliated stations in the adjacent area is also effective in reducing the search time for the relay stations and affiliated stations. Without this processing, the entire band for 50 channels from channel 13 to channel 63 is searched, and the above example has the effect of reducing the number of channel selections by half.

  In addition, it is possible to estimate the current position from the broadcast wave received as described above, and further estimate the transmitting station from the received broadcast wave by providing a transmitting station estimation unit. The position can be estimated and the cost of the apparatus can be reduced.

  Also, as a result of referring to the transmission group list, it is determined that the estimated transmitting station is transmitting the broadcast wave of the relay station or affiliated station to be received, and as a result of searching the physical channel, the relay station or affiliated station can receive it. Even if not, the channel selection candidate extraction unit converts the broadcast wave other than the broadcast wave included in the estimated area to which the transmitting station belongs and the adjacent area into a broadcast wave that is likely to be received by deleting it from the search order list. Further narrowing down can reduce the time required for searching for relay stations and affiliated stations.

  Further, as a result of referring to the transmission group list, even if the estimated transmitting station does not transmit the broadcast wave of the relay station or affiliated station to be received, the channel selection candidate extracting unit determines the area to which the estimated transmitting station belongs and its Broadcast waves other than broadcast waves included in the adjacent area are deleted from the search order list, so it is possible to further narrow down broadcast waves that are highly likely to be received, so the time required for searching relay stations and affiliated stations Can be shortened.

  Further, the transmission group list generation unit generates and stores the transmission group list obtained by converting the broadcasting station information stored in the transmission group list storage unit into the structure of the transmitting station unit as shown in FIG. 3 instead of the frequency list itself. Therefore, when a broadcast wave that is not an affiliated station is received during the affiliated station search, it is possible to immediately search for the affiliated station broadcast transmitted by the transmitting station, and to shorten the affiliated station search time.

  Further, since the transmission group list is generated based on the frequency list downloaded from the broadcast wave, it is possible to flexibly follow the actual operation status even when the operation of the broadcast wave is changed, such as a change in the broadcast frequency.

  Compared with the method of estimating the broadcast area from the area identification information of the broadcast wave other than the affiliated station received during affiliated station search as in Patent Document 2 and searching for affiliated stations in the broadcast area, The search time can be shortened in the method of estimating the transmitting station from the received broadcast wave and selecting the channel of the affiliated station transmitted by the transmitting station. This is the method in the present embodiment particularly when the area identification of the broadcast wave that can be received in the affiliated station search process is a wide area broadcast or a broadcast wave that covers a plurality of areas (prefecture areas). The effect is more remarkable. For example, in the case of Kanto wide area broadcasting, the broadcasting area is the Kanto area, and the number of channels of affiliated stations included therein is very large. For this reason, in Patent Document 2, the number of channel selections until the candidate stations cannot be sufficiently narrowed down and a receivable affiliated station is detected is increased. Since it is only necessary to select the affiliated station that is transmitting, there is a great effect that the number of times of channel selection is only one.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the present embodiment is the same as that shown in FIG.

FIG. 14 shows a transmission group list generated by the transmission group list generation unit. The difference from the first embodiment is that transmission power information is added for each TS as shown in the figure. This transmission power information is obtained from the frequency list.
Furthermore, the search order list generation method (processing in step S201 in FIG. 5) in the channel selection candidate extraction unit 107 is different. That is, the search order list generation in step S201 of FIG. 5 in the second embodiment is performed as shown in FIG.

In FIG. 15, the same reference numerals as those in FIG. 6 denote the same steps.
First, the area to which the broadcast wave received so far belongs is grasped (S301 in FIG. 15), a relay station belonging to that area is searched (S302), and extraction of all relay stations as candidates to be searched first is completed. 15 are executed until the relay station is added to the list as the first priority group (S303). The method for extracting relay stations in the area is the same as the method by referring to the NIT described in the first embodiment or the method by searching in the transmission group list stored in the transmission group storage unit 105.

  At this time, there are generally a plurality of relay stations. In that case, referring to the transmission power described in the transmission group list shown in FIG. 14, the first priority is set so that the channel selection priority is increased in descending order of transmission power. The relay stations in the group list are rearranged (S405 in FIG. 15).

  Next, as a second search priority candidate, an affiliated station in an adjacent area of the area to which the broadcast wave received so far belongs is extracted as a channel selection candidate having the second priority (S306, S307, S308 in FIG. 15). , S409).

  First, the affiliated station in the adjacent area of area A to which the broadcast wave received so far belongs is searched from the transmission group list (S306 in FIG. 15). Then, S306 to S308 in FIG. 15 are executed until extraction of all affiliated stations is completed, and affiliated stations are added to the list as the second priority group (S307 in FIG. 15). The method for extracting affiliated stations in the region is the same as the method by searching in the transmission group list stored in the transmission group storage unit 105 described in the first embodiment.

  At this time, there are generally a plurality of candidates, but referring to the transmission power described in the transmission group list shown in FIG. 14, the channel selection priority is increased in order of increasing transmission power. The affiliated stations are rearranged (S409 in FIG. 15).

  Finally, in S310 of FIG. 15, the second priority group list is added after the first priority group list, and the candidate channel selection in the second priority group list is performed after the channel selection of the candidate in the first priority group list. Prioritize them to be performed and generate a search order list.

  As described above, in the digital broadcast receiving apparatus according to Embodiment 2 of the present invention, the transmission group list generation unit 104 stores transmission power information as shown in FIG. 14 for each broadcast wave (TS), and channel selection candidates. Since the extraction unit 107 has generated a search order list so that the priority of search channel selection is high for those having a large transmission power value, search is performed from broadcast waves with high transmission power, that is, from relay stations and affiliate stations with a wide broadcast area. Since the station is selected, it is possible to increase the probability that the relay station and the affiliated station can be searched by shortening.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the present embodiment is the same as that shown in FIG.

  The third embodiment is the same as the second embodiment, but differs from the second embodiment in the method of generating a search order list (processing in step S201 in FIG. 5) by the channel selection candidate extraction unit 107. That is, the search order list generation in step S201 of FIG. 5 in the third embodiment is performed as shown in FIG.

16, the same reference numerals as those in FIGS. 6 and 15 denote the same steps.
First, the area to which the broadcast wave received so far belongs is grasped (S301 in FIG. 16), and a relay station belonging to that area is searched (S302).

  Next, referring to the transmission power described in the transmission group list shown in FIG. 14, it is determined whether or not the transmission power is larger than a certain threshold value P (dbm) (S411). If smaller, the process returns to step S302 to search for the next relay station. . If the transmission power is larger than a certain threshold value P, the relay station is added to the first priority group list in step S303.

  Then, S302, S303, S304, and S405 in FIG. 16 are executed until extraction of all relay stations is completed, and relay stations are added to the list as the first priority group. The method for extracting the relay stations in the area is the same as the method for referring to the NIT or the method for searching the transmission group list described in the first embodiment.

  At this time, there are generally a plurality of relay stations. In that case, referring to the transmission power in the transmission group list shown in FIG. The relay stations in the group list are rearranged (S405 in FIG. 16).

  Next, as a second search priority candidate, affiliate stations in the adjacent area to which the broadcast wave received so far belongs are listed as channel selection candidates having the second priority (S306, S412 in FIG. 16, S307, S308, S409).

First, an affiliated station that belongs to the area of the broadcast wave that has been received is searched (S306 in FIG. 16).
Next, referring to the transmission power described in the transmission group list shown in FIG. 14, it is determined whether or not the transmission power is larger than a certain threshold value P (dbm) (S412). If smaller, the process returns to step S306 to search for the next affiliated station. . If the transmission power is greater than a predetermined threshold P, the affiliated station is added to the second priority group list in step S307.

  Then, steps S306, S412, S307, S308, and S409 in FIG. 16 are executed until extraction of all affiliated stations is completed, and affiliated stations are added to the list as the first priority group. At this time, the method for extracting affiliated stations in the region is the same as the method for searching the transmission group list described in the first embodiment.

  In general, there are a plurality of affiliated stations. In this case, the second priority group list is set so that the channel selection priority increases in descending order of the transmission power with reference to the transmission power described in the transmission group list shown in FIG. The affiliated stations are rearranged (S409 in FIG. 16).

  Finally, in step S310 of FIG. 16, the second priority group list is added next to the first priority group list, and the candidate selection in the second priority group list is performed after the selection of candidates in the first priority group list. Is prioritized so that a search order list is generated.

  As described above, in the digital broadcast receiving apparatus according to Embodiment 3 of the present invention, the channel selection candidate extraction unit 107 excludes transmission power values below a certain threshold from the search order list. By not searching for small relay stations and affiliated stations, it is possible to shorten the time required to detect relay stations and affiliated stations that are likely to be received.

  Specifically, for example, if the transmission power is about 10 dbm, the broadcast area is often about 1 km or less. Even if the in-vehicle digital broadcast receiver can receive the broadcast in such an area, the broadcast area can be set within a few minutes. By removing such broadcast waves from the search target, it is possible to shorten the time required to search for relay stations and affiliate stations with a wide broadcast area that are likely to be received. Search time can be shortened. In particular, the search for affiliated stations belonging to adjacent areas is awaited because it is performed after the search for relay stations in the area to which the received broadcast wave belongs. If there is an affiliated station that is likely to be able to receive a very wide broadcast area in the adjacent area, the former affiliate that is likely to be received by a search for a relay station that is very narrow in the broadcast area. The start of the station search is awaited. Thus, removing broadcast waves with very low transmission power from candidates has the effect of quickly searching for and selecting affiliate stations that are likely to be able to receive a wide range of broadcast areas belonging to adjacent areas.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the present embodiment is the same as that shown in FIG.

  The fourth embodiment is the same as the second embodiment except that a transmission group list generated by the transmission group list generation unit 104 and a search order list generation method by the channel selection candidate extraction unit 107 (FIG. 5). In step S201) is different from the second embodiment.

FIG. 17 shows a transmission group list generated by the transmission group list generation unit 104. The difference from the transmission group list generated in the second embodiment is that for each broadcast wave (for each TS_ID), the relay station and affiliated station received immediately before receiving the broadcast wave (TS) as shown in the figure. Information, that is, physical channels and broadcast wave identification information (TS_ID) are further stored.
For each broadcast wave, the relay station and affiliated station information received immediately before is updated when reception of each broadcast wave is started.

  The search order list generation in step S201 of FIG. 5 in the fourth embodiment is performed as shown in FIG.

  The channel selection candidate extraction unit 107 determines whether the broadcast wave received immediately before receiving the broadcast wave whose reception condition has deteriorated is one of the relay station and affiliated station of the broadcast wave whose reception condition has deteriorated this time. Is confirmed with reference to the transmission group list shown in FIG. 17 (S501 in FIG. 18).

  As a result of checking with reference to the transmission group list shown in FIG. 17, if the broadcast wave received immediately before the broadcast wave received so far is a relay station or affiliated station (Yes in S501), the channel selection candidate The extraction unit 107 generates a search order list so that the physical channel described in the affiliate / relay station information column received immediately before the transmission group list shown in FIG.

The subsequent search order list generation method (S503, S504) is the same as in the second embodiment.
That is, step S503 is the same as steps S301, S302, S303, S304, and S405 in FIG. 15, and step S504 is the same as steps S306, S307, S308, S409, and S310 in FIG. However, what are called “first priority group” and “second priority group” in FIG. 15 are generated as “second priority group” and “third priority group” in FIG.

The features of the fourth embodiment described above may be combined with the method of the third embodiment. In this case, search order list generation (step 512 in FIG. 5) is as shown in FIG. FIG. 19 is the same as FIG. 18, but steps S513 and S514 are performed instead of steps S303 and S504 in FIG.
Steps S513 and S514 are the same as steps S503 and S504, respectively. However, as described in the third embodiment, steps S503, S514 are added to the priority group only when the transmission power is equal to or higher than the threshold. Different from S504.

  As described above, in the digital broadcast receiving apparatus according to the fourth embodiment of the present invention, when the broadcast wave received before the broadcast wave received when the reception situation deteriorates is a relay station or an affiliated station. In addition, when the physical channel of the relay station or affiliated station is searched and selected, the broadcast area of the relay station or affiliated station moves in a fringe area (boundary area) that overlaps each other, or these broadcast areas In the case of reciprocating between the relay stations and the affiliated stations, the search station can be initially selected and the search time can be greatly shortened. Since the case of moving between two affiliated station areas is likely to occur more frequently than the case of moving sequentially between three or more affiliated station areas, the history of two or more previous records is recorded. Aside from the method of searching for candidates in the order of their history (in the order received more recently), there are more opportunities to function effectively.

Embodiment 5 FIG.
Next, a fifth embodiment will be described. FIG. 20 is a diagram showing a configuration of the digital broadcast receiving apparatus according to the present embodiment.
Members that are the same as or similar to those in FIG. The antenna 101, the tuner / demodulation unit 102, and the video / audio decoding unit 103 are connected to the control unit 121 and the storage unit 122 via the bus 123.

  The tuner / demodulation unit 101, the demultiplexing unit 102, and the video / audio decoding unit 103 perform the same operations as in the first embodiment, but operate under the control of the control unit 121.

  The control unit 121 is configured by a CPU, and each operation of the reception status determination unit 106, the channel selection candidate extraction unit 107, the transmission station estimation unit 108, the channel selection control unit 109, and the transmission group list generation unit 104 in the first embodiment. Is executed by a computer program.

  The storage unit 122 stores the same transmission group list as that in the first embodiment and also stores a computer program for the operation of the control unit 121.

The control unit 121 is the flowchart of the broadcast reception process in FIG. 4 described in the first, second, third, or fourth embodiment, the flowchart of each relay / affiliated station search in FIG. 5, and the first, second, and third embodiments. The processing of the search order list generation flowchart of FIGS. 6, 15, and 16 described above or the processing of the search order list generation flowchart of FIGS. 18 and 19 described in the fourth embodiment is performed. For these processes, the control unit 121 reads and writes the storage unit 122.
As part of this reading and writing, a process of storing broadcast wave information in the storage unit 122 is performed.

  As described above, the digital broadcast receiving apparatus according to the fifth embodiment of the present invention has the same effects as those of the first, second, third, or fourth embodiment.

  100 antenna, 101 tuner / demodulation unit, 102 demultiplexing unit, 103 video / audio decoding unit, 104 transmission group list generation unit, 105 transmission group list storage unit, 106 reception status determination unit, 107 channel selection candidate extraction unit, 108 transmission Station estimation unit, 109 channel selection control unit, 110 memory, 121 control unit, 122 storage unit.

Claims (8)

A tuner / demodulator that demodulates the broadcast wave transmitted from the transmitting station to obtain a broadcast signal;
Transmission group list storage means for storing a transmission group list in which the broadcast wave identification information, the physical channel and the broadcast target area of the broadcast wave are associated with the transmission station identification information;
Channel selection candidate extracting means for referring to the transmission group list and generating a search order list that narrows down the channel selection candidates only to the broadcast target area of the broadcast wave that has been received and the channels of broadcast stations in the adjacent area;
In a digital broadcast receiving apparatus comprising: a tuning control unit that instructs the tuner / demodulating unit to select a channel according to the search order list;
Transmitting station estimation means for searching the transmission group list storage means from the broadcast wave identification information of the broadcast wave received during the search and its received physical channel, and estimating the transmitting station transmitting the broadcast wave being received Prepared,
The channel selection candidate extracting unit updates the search order list so that a physical channel transmitted by the estimation transmitting station is preferentially searched. A tuner / demodulator that demodulates the broadcast wave transmitted from the transmitting station to obtain a broadcast signal;
Transmission group list storage means for storing a transmission group list in which broadcast wave identification information, physical channel, affiliated station identification information of the broadcast wave is associated with transmitting station identification information;
Channel selection candidate extracting means for acquiring a physical channel of a relay station or affiliated station corresponding to the broadcast wave that has been viewed so far from the transmission group list storage means using the affiliated station identification information and generating a search order list When,
A reception status deterioration determining means for detecting a deterioration in the reception status of the physical channel being received;
In a digital broadcast receiving apparatus comprising: a tuning control unit that instructs the tuner / demodulating unit to select a channel according to the search order list when the viewing state deteriorates.
Transmitting station estimation means for searching the transmission group list storage means from the broadcast wave identification information of the broadcast wave received during the search and its received physical channel, and estimating the transmitting station transmitting the broadcast wave being received Prepared,
Upon receiving the broadcast waves nor broadcast waves of the broadcast waves even affiliated station relay station corresponding to a broadcast wave has been received before the search begins during the search, the channel selection candidate extracting means stores the transmission group list Referring to means, if it is determined that the transmitting station which is estimated to be transmitted through the said received broadcast wave is not sending a broadcast wave of the relay stations and affiliated stations, the station selection candidate extracting means A digital broadcast receiver characterized in that the search target is narrowed down to broadcast stations belonging to an estimated area to which a transmitting station belongs and an adjacent area. A tuner / demodulator that demodulates the broadcast wave transmitted from the transmitting station to obtain a broadcast signal;
Transmission group list storage means for storing a transmission group list in which broadcast wave identification information, physical channel, affiliated station identification information of the broadcast wave is associated with transmitting station identification information;
The channel selection candidate extracting means for acquiring the physical channel of the relay station or affiliated station corresponding to the broadcast wave received so far from the transmission group list storage means, and generating a search order list;
A reception status deterioration determining means for detecting a deterioration in the reception status of the physical channel being received;
In a digital broadcast receiving apparatus comprising: a tuning control unit that instructs the tuner / demodulating unit to select a channel according to the search order list when the viewing state deteriorates .
Transmitting station estimation means for searching the transmission group list storage means from the broadcast wave identification information of the broadcast wave received during the search and its received physical channel, and estimating the transmitting station transmitting the broadcast wave being received Prepared,
Upon receiving the broadcast waves nor broadcast waves of the broadcast waves even affiliated station relay station corresponding to a broadcast wave has been received before the search begins during the search, the channel selection candidate extracting means stores the transmission group list Referring to means, if it is determined that the transmitting station which is estimated to be transmitted through the said received broadcast waves broadcast wave is being transmitted in the relay station or affiliate channels, the station selection candidate extracting means A digital broadcast receiving apparatus, characterized in that a search order list is generated so that the channel selection order of the affiliated station / relay station is first. The transmission group list stored by the transmission group list storage means further records the transmission power of each broadcast wave,
The digital broadcast receiving apparatus according to any one of claims 1 to 3, wherein the channel selection candidate extracting unit excludes broadcast waves whose transmission power is equal to or less than a threshold value from the search order list. The transmission group list stored by the transmission group list storage means further records the transmission power of each broadcast wave,
4. The channel selection candidate extraction unit refers to the transmission power, and generates the search order list so that a channel selection priority of a broadcast wave having a large transmission power is high. The digital broadcast receiver according to one item. When the channel selection control means cannot receive the broadcast wave of the physical channel selected according to the search order list, the tuner / demodulation means sends the physical channel that is the next channel selection candidate in the search order list. The digital broadcast receiving apparatus according to any one of claims 1 to 3, wherein a channel is selected. Demultiplexing means for downloading a frequency list included in the broadcast signal;
Transmission for generating a transmission group list in which a plurality of broadcast waves to be transmitted for each transmission station, the physical channel of the broadcast wave, and affiliated station identification information are grouped for each transmission station from the downloaded frequency list information A group list generating means;
The digital broadcast receiver according to any one of claims 1 to 3, wherein the transmission group list storage unit stores the transmission group list generated by the transmission group list generation unit. The transmission group list storage means includes, when the other broadcast waves received immediately before each broadcast wave are broadcast waves transmitted by a relay station or affiliated station in the transmission group list, Record the physical channel of the other broadcast wave in association with
The channel selection candidate extracting means records the other broadcast wave in association with the broadcast wave whose reception status has deteriorated with reference to the transmission group list when the reception status of the broadcast wave being received has deteriorated 4. The digital broadcast receiving apparatus according to claim 2, wherein the search order list is generated so that the other broadcast wave is searched first. 5.

Images