JP2012138790A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast receiver which, when receiving a digital broadcast wave whose broadcast station and TSID do not correspond one to one, can avoid an unintended channel selection by a user.SOLUTION: The digital broadcast receiver of the present invention includes a broadcast receive unit and a record unit which records related information in which identification information on a broadcast wave and broadcast wave frequency bands are associated. It also includes a receive control unit which controls the broadcast receive unit by distinguishing the frequency band of a selected channel broadcast wave from the related information. Furthermore, it includes an information update unit which acquires relay station information from a broadcast wave and updates the related information based on a frequency band indicated in the relay station information, and an update determination unit which compares the frequency band indicated in related information and the frequency band acquired from a broadcast wave. If a prescribed condition is not met as a result of comparison, the information update unit adds related information, in which identification information on a broadcast wave which has been successfully received and the frequency band acquired from that broadcast wave are associated, to the related information.

Description

  The present invention relates to a digital broadcast receiving apparatus that receives digital broadcast waves, and more particularly to a digital broadcast receiving apparatus for a mobile body having a function of receiving broadcast waves from a plurality of relay stations.

  In recent years, terrestrial digital broadcasting exists as one of digital broadcasting. In Japan, the current terrestrial analog broadcasting is scheduled to end in 2011, and the transition to terrestrial digital broadcasting is underway. Along with this, digital broadcasting receivers for mobile bodies mounted on car navigation systems, mobile phones and the like have been widely developed.

  In digital terrestrial broadcasting, a relay station receives a radio wave transmitted from a master station and retransmits it from the relay station in order to realize the same broadcast in a wide area. In particular, mobile digital broadcast receivers maintain a table showing the physical channels of relay stations for each broadcast station, and search for physical channels included in the table when an arbitrary broadcast station is selected by a user operation. Some have the function to do.

  In addition, when the reception state deteriorates, there is a digital broadcast receiving apparatus that automatically searches for a relay station or affiliated station and switches to a physical channel with a good reception state.

  For example, in the case of an in-vehicle digital broadcast receiver, the reception state changes every moment depending on the position, speed, etc. of the vehicle during traveling. As the boundary between the current broadcast area and the destination area approaches, it becomes difficult to receive broadcast waves directed to the current broadcast area. Then, it becomes possible to receive broadcast waves directed to the destination area. The search function described above is effective in such a boundary region.

  In relation to the above, Patent Document 1 discloses a digital broadcast receiving apparatus that can prevent frequent re-tuning operation, maintain a suitable reception state, and select a channel with a suitable reception level. ing.

JP 2007-312110 A

  According to the conventional digital broadcast receiving apparatus disclosed in Patent Document 1, when the reception state deteriorates, the channel of the relay station that broadcasts the program is grasped from the broadcast data, and user operation is required. You can tune in without having to. The physical channel of the relay station for each broadcast station (hereinafter referred to as “relay station channel”) can be determined by referring to a NIT (Network Information Table) included in a TS (Transport Stream).

  The relay station channel is changed by frequency organization. For this reason, updating is necessary from time to time. Conventionally, a relay station channel has been updated using a TSID (Transport Stream Id) that is unique for each broadcasting station as a primary key. For example, a database (hereinafter referred to as a “channel selection candidate table”) using a TSID included in a broadcast wave as a main key is created, and relay station channels are managed using the channel selection candidate table.

  FIG. 10 shows a processing flow of relay station search processing that is performed when channel selection by a user operation occurs or when the reception state deteriorates. FIG. 11 shows an example of the channel selection candidate table. FIG. 12 shows information (hereinafter referred to as “relay station information”) included in the NIT and indicating the relay station channel of the received broadcast wave.

  As shown in FIG. 10, in the conventional relay station search process, even if reception of a certain relay station channel is successful (step S930), reception is performed when the TSID is different from the TSID of the broadcast station instructed by the user. The relay station search process was continued (step S940).

  As shown in FIG. 11, the TSID is identification information assigned in advance for each broadcasting station. The data for one row of the table in the figure indicates a plurality of relay station channels associated with one broadcasting station. In the example of FIG. 11, among the plurality of relay station channels, the relay station channel having the higher reception sensitivity is arranged in the left direction, and the relay station channel having the lower reception sensitivity is arranged in the right direction. Thereby, it is possible to determine the relay station channel to be preferentially searched. However, the arrangement method based on the reception sensitivity as described above is merely an example, and the arrangement method can be appropriately changed according to the operation mode. Or the form which arranges at random may be sufficient.

  In the example of FIG. 11, for example, when the broadcast station A is selected by the user, the process of FIG. 10 is performed until a broadcast wave with a TSID of 0x7FE0 is successfully received. Also, when the reception sensitivity deteriorates during the reception of the broadcasting station A, the processing of FIG. 10 is similarly performed.

  For example, assume that the channel selection candidate table at a certain time is in the state shown in FIG. In this state, it is assumed that the relay station information included in the NIT is the content of FIG. 12 as a result of receiving the broadcast wave of TSID = 0x7FE0 in 47ch. In this case, there is a difference between the channel selection candidate table and the relay station information (relay station channel indicated by a circle in FIG. 12). Therefore, it is determined that the channel selection candidate table needs to be updated, and the relay station channel column of the channel selection candidate table is updated based on the NIT relay station information.

  As a result, the channel selection candidate table is updated to the state shown in FIG. In the example of FIG. 11B, 32ch and 15ch are newly added as relay station channels with TSID = 0x7FE0. Also, 37ch and 13ch are deleted. Henceforth, when the relay station search of the broadcasting station A is performed, the search is performed in the order of 19 ch → 32 ch → 47 ch → 15 ch.

  The prior art described above is based on the premise that the broadcasting station is unique for each TSID. For example, in ARIB (Association of Radio Industries and Broadcast) standard technical document number TR-B14, it is defined that TSID is equivalent to network_id. For this reason, there is a one-to-one relationship between TSID and broadcasting station.

  However, depending on digital broadcasting standards, an operation mode in which a plurality of broadcasting stations share the same TSID can be assumed. In the case of this operation mode, if the relay station information in the channel selection candidate table is updated by the conventional technique, a plurality of different broadcast stations may be regarded as one broadcast station, and the relay station information may be updated illegally. is there.

  For example, it is assumed that the TSID assigned to each broadcasting station is in the state shown in the schematic diagram of FIG. In FIG. 3, the TSIDs of the broadcasting stations A and C are 0x7FE0. Therefore, the relay station information of TSID = 0x7FE0 in the channel selection candidate table is that of the broadcast station A in a state where the broadcast wave of the broadcast station A is received.

  In this state, when the mobile body equipped with the digital broadcast receiving apparatus moves and receives the broadcast wave of the broadcast station C, the relay station information of TSID = 0x7FE0 is replaced with the relay station information of the broadcast station C. However, the relay station information of TSID = 0x7FE0 in the updated channel selection candidate table is regarded as the relay station information of the broadcasting station A for internal processing.

  Therefore, from the viewpoint of the user, although the broadcast station A is selected, since the relay station channel of the broadcast station C is actually searched, the program of the broadcast station A cannot be viewed. As described above, when the relay station information of one broadcasting station is updated by a plurality of broadcasting stations, there arises a problem that a normal channel selection operation cannot be performed as a result.

  The present invention has been made to solve the above-described problems, and an object of the present invention is a digital broadcast receiving apparatus for a mobile body having a function of receiving broadcast waves from a plurality of relay stations. To provide a digital broadcast receiving apparatus capable of avoiding a channel selection operation unintended by a user when receiving a digital broadcast wave in an operation mode in which the relationship between TSID and TSID is not one-to-one. is there.

  In order to achieve the above object, a digital broadcast receiving apparatus of the present invention associates a broadcast receiving unit that receives and selects a broadcast wave, identification information of the broadcast wave, and a frequency band for receiving the broadcast wave. A recording unit for recording related information, a channel selection instruction is received, a frequency band for receiving a broadcast wave instructed to be selected is determined based on the related information, and channel selection and reception are performed based on the determined frequency band. A reception control unit that controls the broadcast receiving unit, and relay station information indicating a frequency band of a relay station that relays a broadcast wave is obtained from the broadcast wave, and the related information is obtained according to the frequency band indicated in the relay station information. In the digital broadcast receiving device comprising an information updating unit for updating the information, when the channel selection by the broadcast receiving unit is performed and reception of the selected broadcast wave is successful, it is indicated in the related information. The digital broadcast receiving apparatus includes an update determination unit that compares the frequency band of the broadcast wave with the frequency band indicated in the relay station information acquired from the broadcast wave, and the comparison result is predetermined. When the information update unit does not satisfy the condition, the information update unit associates the identification information of the broadcast wave that has been successfully received and the information that associates the frequency band indicated in the relay station information acquired from the broadcast wave with the related information. It is characterized by adding to.

  According to this configuration, the digital broadcast receiving apparatus of the present invention includes a broadcast receiving unit that receives and selects a broadcast wave, and a recording unit that records related information in which the identification information of the broadcast wave is associated with the frequency band of the broadcast wave. And. In addition, a reception control unit that receives a channel selection instruction, determines a frequency band of a broadcast wave based on related information, and controls the broadcast reception unit to perform channel selection and reception using the determined frequency band is provided. In addition, an information update unit is provided that acquires relay station information indicating the relay station from the broadcast wave and updates related information based on the frequency band indicated in the relay station information. An update determination unit that compares the frequency band indicated in the related information with the frequency band indicated in the relay station information acquired from the broadcast wave when the selected broadcast wave is successfully received. I have. When the result of the comparison does not satisfy the predetermined condition, the information update unit associates the identification information of the broadcast wave that has been successfully received with the frequency band indicated in the relay station information acquired from this broadcast wave, Add to related information.

  In order to achieve the above object, when the result of the comparison satisfies the condition, the information update unit uses the frequency band indicated in the relay station information acquired from the broadcast wave that has been successfully received. The frequency band of the broadcast wave indicated in the related information is updated.

  According to this configuration, when the comparison result satisfies the predetermined condition, the information update unit is indicated in the related information using the frequency band indicated in the relay station information acquired from the broadcast wave that has been successfully received. Update the frequency band of this broadcast wave.

  Further, in order to achieve the above object, the reception control unit acquires, from the broadcast wave, identification information of the broadcast wave that has been successfully received and the broadcast wave by the information update unit when the comparison result does not satisfy the condition. When the information associated with the frequency band indicated in the relay station information is added to the related information, the broadcast receiving unit reattempts channel selection in a frequency band different from the frequency band of the broadcast wave. And when the result of the comparison satisfies the condition, the information update unit uses the frequency band indicated in the relay station information acquired from the broadcast wave successfully received by the information update unit. When the frequency band of the broadcast wave indicated in the information is updated, the broadcast receiving unit is controlled to continue reception using the frequency band of the broadcast wave.

  According to this configuration, when the comparison result does not satisfy the predetermined condition, the reception control unit regards that the broadcast wave instructed to be selected has failed to be received, and the related information is updated by the information update unit. Then, the broadcast receiving unit is controlled so as to retry channel selection in a frequency band different from the frequency band of the broadcast wave that has been successfully received. In addition, the reception control unit, when the comparison result satisfies a predetermined condition, receives the broadcast reception so as to continue reception in the frequency band of the broadcast wave that has been successfully received when the related information is updated by the information update unit. Control part.

  Further, in order to achieve the above object, the update determination unit, as the condition, sets the frequency band indicated in the relay station information acquired from the broadcast wave successfully received and the broadcast wave indicated in the related information. The number of matches with the frequency band exceeds a predetermined threshold, the number of mismatches between the two frequency bands falls below a predetermined threshold, or the ratio of the number of mismatches to the number of matches is predetermined. It is used as the condition to fall below a threshold value.

  According to this configuration, the update determination unit has a predetermined number of matches between the frequency band indicated in the relay station information acquired from the broadcast wave that has been successfully received and the frequency band of the broadcast wave indicated in the related information. Whether or not the threshold is exceeded is used as a determination condition. Alternatively, whether or not the number of mismatches between both frequency bands falls below a predetermined threshold is used as a determination condition. Alternatively, whether or not the ratio of the number of mismatches to the number of matches is less than a predetermined threshold is used as a determination condition.

  In order to achieve the above object, when the result of the comparison does not satisfy the condition, the information update unit transmits the TSID (Transport Stream Id) of the broadcast wave that has been successfully received and the NIT ( Information relating to the frequency band shown in the Network Information Table) is added to the related information.

  According to this configuration, when the result of the comparison does not satisfy the condition, the information update unit associates the TSID of the broadcast wave that has been successfully received with the frequency band indicated in the NIT included in the broadcast wave. Added information to related information.

  In order to achieve the above object, the information updating unit obtains an organization channel name, which is information for identifying a plurality of broadcast services provided in one frequency band by a broadcast station, from the broadcast wave. Information relating the identification information and the organization channel name acquired from the broadcast wave is included in the related information and recorded in the recording unit, and the update determination unit is selected by the broadcast receiving unit and When the selected broadcast wave is successfully received, the organization channel name of the broadcast wave indicated in the related information is compared with the organization channel name acquired from the broadcast wave, and the result of the comparison When the composition channel names do not match, or when the ratio of the composition channel names matches is below a predetermined threshold, the information update unit acquires from the broadcast wave that has been successfully received. Information associated with the frequency band indicated in the relay station information acquired from the broadcast wave is added to the related information, and when the channel names match, or the channel name The information update unit uses the frequency band indicated in the relay station information acquired from the broadcast wave that has been successfully received, to indicate the related information in the related information. The frequency band of the broadcast wave being updated is updated.

  According to this configuration, the information updating unit obtains the organization channel name, which is information for identifying a plurality of broadcast services provided in one frequency band, from the broadcast wave. Information related to the identification information of the broadcast wave and the organization channel name is included in the related information and recorded in the recording unit. When the update determination unit succeeds in receiving a broadcast wave, the update determination unit compares the broadcast channel organization channel name indicated in the related information with the organization channel name acquired from the broadcast wave. As a result of the comparison, if the organization channel names do not match, or if the matching ratio falls below a predetermined threshold, the information updating unit adds the organization channel name obtained from this broadcast wave and the relay station information obtained from this broadcast wave. Information associated with the indicated frequency band is added to the related information. When the organization channel names match, or the matching ratio exceeds a predetermined threshold, the information update unit is indicated in the related information using the frequency band indicated in the relay station information acquired from this broadcast wave. Update the frequency band of this broadcast wave.

  In order to achieve the above object, when the composition channel name does not match or when the ratio of the composition channel name matches is below a predetermined threshold, the reception control unit When information relating the organization channel name acquired from a broadcast wave that has been successfully received and the frequency band indicated in the relay station information acquired from the broadcast wave is added to the related information, the broadcast wave The broadcast receiving unit is controlled to retry channel selection in a frequency band different from the frequency band of the first, and the threshold for which the composition channel name matches or the ratio of the composition channel name matches is predetermined. If the information update unit uses the frequency band indicated in the relay station information acquired from the broadcast wave successfully received by the information update unit, the related information When the frequency band of dissipating wave transmission shown is updated, and controls the broadcast receiving unit to continue the reception by the frequency band of dissipating wave transmission.

  According to this configuration, the reception control unit regards that the reception of the broadcast wave instructed to channel selection has failed when the channel names do not match or when the ratio of the channel names matches falls below a predetermined threshold. When the related information is updated by the updating unit, the broadcast receiving unit is controlled to retry channel selection in a frequency band different from the frequency band of the broadcast wave that has been successfully received. In addition, the reception control unit, when the composition channel names match, or when the ratio of the composition channel names matches exceeds a predetermined threshold, when the related information is updated by the information update unit, The broadcast receiving unit is controlled so that reception by the frequency band is continued.

  According to the present invention, when receiving a digital broadcast wave in an operation mode in which the relationship between the broadcast station and the TSID is not one-to-one, the broadcast stations are regarded as matching based on the frequency band of the relay station or the organized channel name. Only if the frequency band of the related information is updated. On the other hand, if it is determined that the broadcast stations do not match, the identification information of the broadcast station, the frequency band of the relay station, or the channel name is added to the related information.

  The reception control unit discriminates a broadcasting station using this related information and performs a channel selection operation. Thereby, when the identification information of a plurality of broadcasting stations overlaps, it is possible to avoid a situation in which broadcast waves from a broadcasting station different from the broadcasting station designated by the user are received, resulting in user confusion.

It is a block diagram which shows the internal structure of the digital broadcast receiver which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the function part which concerns on one Embodiment of this invention. It is a schematic diagram which shows a relay station and its identification information. It is a table figure which shows the channel selection candidate table which concerns on 1st embodiment of this invention. It is a schematic diagram which shows the relay station information contained in a broadcast wave. It is a flowchart which shows the search process which concerns on 1st embodiment of this invention. It is a table figure which shows the channel selection candidate table which concerns on 2nd embodiment of this invention. It is a schematic diagram which shows the organization channel name contained in a broadcast wave. It is a flowchart which shows the search process which concerns on 2nd embodiment of this invention. It is a flowchart which shows the conventional search process. It is a table figure which shows the conventional channel selection candidate table. It is a schematic diagram which shows the relay station information contained in a broadcast wave.

Embodiments of the present invention will be described below with reference to the drawings. In addition, embodiment shown here is an example and this invention is not limited to embodiment shown here.
[Embodiment 1]
<1-1. Internal configuration>
FIG. 1 is a block diagram showing an internal configuration of an in-vehicle receiving device 100 (= digital broadcast receiving device) according to an embodiment of the present invention. As shown in the block diagram of FIG. 1, the in-vehicle receiving device 100 of the present invention can connect a diversity antenna 1 as an external device.

  The on-vehicle receiving device 100 includes at least a tuner 11 (= broadcast receiving unit), a demodulating unit 12 (= broadcast receiving unit), an operation input unit 13, a CPU 14, a RAM 15 (= recording unit), a ROM 16, an audio filter 17, and an audio decoder. 18, a video filter 19, a video decoder 20, a data filter 21, a data decoder 22, and an output unit 23.

  The tuner 11 receives a terrestrial digital broadcast signal from the diversity antenna 1 and selects a channel on a desired physical channel (= frequency band). Further, the tuner 11 monitors whether or not broadcast waves can be received on the selected physical channel. Specifically, for example, when a vehicle equipped with the in-vehicle receiving device 100 straddles a reception area or the like and the electric field intensity of the broadcast wave received so far falls below a predetermined threshold, it is considered that reception is impossible. .

  The demodulator 12 demodulates and error-corrects the selected signal input from the tuner 11 and outputs each TS of one segment and 12 segments. The TS demodulated by the demodulator 12 is given to an audio filter 17, a video filter 19, and a data filter 21 described later.

  The operation input unit 13 includes a remote controller (not shown) and a remote control light receiving unit. The remote control is provided with a push button, a touch sensor, and the like for giving a channel selection instruction to the in-vehicle receiving device 100. The operation input unit 13 includes a hard key, a touch panel, and the like provided in the housing of the in-vehicle receiving device 100. The operation input unit 13 generates and outputs an operation signal based on a user operation received by any of the above devices. The operation input unit 13 does not necessarily include all of the above devices, and may include only a part of the above devices.

  The CPU 14 is an arithmetic processing device that performs various calculations, processes, and controls. The CPU 14 organically controls the driving of each member of the in-vehicle receiving device 100 and performs overall control of broadcast reception processing and the like. The RAM 15 is used as a work memory for the CPU 14. The ROM 16 stores a control program executed by the CPU 14 and the like.

  The audio filter 17 extracts only audio data from the TS output from the demodulator 12. The audio decoder 18 decodes the extracted audio data to generate a digital audio signal, and provides it to the output unit 23 described later.

  The video filter 19 extracts only video data from the TS output from the demodulator 12. The video decoder 20 decodes the extracted video data to generate a digital image signal, and provides it to the output unit 23 described later.

  The data filter 21 extracts data such as transmission parameters, NIT (Network Information Table), program information, and data broadcast from the TS output from the demodulator 12. The data decoder 22 decodes the extracted data. The decrypted data is recorded in the RAM 15 or the like.

The output unit 23 includes an output terminal for connecting a display device such as a liquid crystal monitor and an audio device such as a speaker to output an image signal and an audio signal.
<1-2. About the configuration of the function section>
Here, the relationship between the functional units for performing the search processing according to the first embodiment of the present invention will be described with reference to the functional block diagram of FIG. In FIG. 2, the functional blocks illustrated inside the CPU 14 represent functional units realized by the CPU 14 executing a predetermined program.

  As shown in FIG. 2, the search process of the present embodiment is performed by a search unit 14a (= reception control unit), a table creation unit 14b (= information update unit), and an update determination unit 14c.

  The search unit 14a performs a search process for trying to receive a predetermined broadcast wave. The search unit 14a analyzes the receivable relay station channel and uses the channel selection candidate table (= related information) shown in FIG. 11 to estimate the broadcast wave estimated to be broadcasting the program instructed by the user. Try to receive

  If the reception is successful and the TSID (= identification information) of the broadcast wave matches the specified TSID, reception of this broadcast wave is started. When reception fails or when the TSID is different, the search unit 14a attempts to receive a broadcast wave using an unchecked relay station channel included in the channel selection candidate table.

  For example, assume that the channel selection candidate table is in the state shown in FIG. In this case, even if the user presses the remote control button associated with the physical channel 13ch (= broadcasting station A), since the reception state of 19ch is better than 13ch at this time, the search unit 14a selects 19ch. Bureau.

  The table creation unit 14b determines the TSID and relay station channel of the received broadcast wave by analyzing NIT, PAT (Program Association Table), PMT (Program Map Table), etc. included in the broadcast wave, and generates a channel selection candidate table And recorded in the RAM 15 or the like. These various types of information are acquired from information generated by the data filter 21 or the data decoder 22.

  The table creation unit 14b adds / deletes the relay station channel to / from the channel selection candidate table based on the search result by the search unit 14a.

  The update determination unit 14c updates the content of the channel selection candidate table by comparing the content of the channel selection candidate table with the relay station information indicated by the received NIT. For example, if three or more relay station channels match as a result of the comparison, the update determination unit 14c determines that they are the same broadcast station. This utilizes the fact that each relay station is unlikely to frequently change the physical channel to be used.

  Specifically, for example, it is assumed that the channel selection candidate table is in the state of FIG. 4A and the relay station information indicated by the NIT included in the received broadcast wave is the content of FIG. In this case, there are three identical relay station channels. For this reason, the update determination unit 14c determines that the broadcast wave of the relay station of the broadcast station A has been received. As a result, the table creation unit 14b replaces the information of the broadcasting station A in the channel selection candidate table with the contents of the received NIT, and sets the state of FIG.

  Further, for example, assume that the channel selection candidate table is in the state of FIG. 4A, and the relay station information indicated by the NIT included in the received broadcast wave is the content of FIG. 5B. In this case, there are only two identical relay station channels. For this reason, the update determination unit 14c determines that a broadcast wave of a relay station of a broadcast station (here, “broadcast station X”) different from the broadcast station A is received.

As a result, the table creation unit 14b updates the channel selection candidate table as shown in FIG. In the example of FIG. 4C, the channel information of the broadcasting station X is added as a broadcasting station different from the broadcasting station A. The name of the newly added broadcasting station may be an arbitrary name given by the table creating unit 14b, or predetermined information included in the broadcast wave (for example, a TS name included in the NIT) is used as the name. The form to do may be sufficient.
<1-3. Search process>
Here, the processing flow of the search processing performed by the in-vehicle receiving device 100 according to the first embodiment of the present invention will be described using the flowchart of FIG.

  The processing flow of this embodiment is started when an instruction to start relay station search is detected. This start instruction is issued when it is detected that the reception sensitivity of the broadcast wave being received has decreased, or when it is detected that the reception sensitivity is low as a result of the channel selection operation based on the user operation. publish.

  After the start of this processing, in step S110, the search unit 14a determines whether or not there is an unsearched relay station channel for the relay station channel of the broadcast station instructed to select a channel. In the following description, the case where the broadcast station instructed to select is the broadcast station A shown in FIG. 4 will be described as an example.

  When there is no unsearched relay station channel, that is, when the search is performed for all of the 19ch to 13ch of the broadcasting station A shown in FIG. When there is an unsearched relay station channel, the search unit 14a determines, in step S120, the relay station channel to be received next to the previously searched relay station channel from the update management table, and uses the determined relay station channel. Attempt to receive.

  Next, in step S130, the search unit 14a determines whether or not reception by the relay station channel has been successful. If the reception fails, the process proceeds to step S110 again. If the reception is successful, the search unit 14a determines in step S140 whether the broadcast wave designated as the channel selection target, that is, the broadcast wave of the broadcast station A has been successfully received.

    Specifically, NIT, PAT, or PMT included in the received broadcast wave is analyzed, and TSID is acquired. Then, it is determined whether or not it matches the TSID (= 0x7FE0) of the broadcasting station A. If they match, the reception is considered successful.

  If the reception fails, the process proceeds to step S110 again. If reception is successful, the update determination unit 14c compares the relay station channel indicated in the update management table with the relay station channel indicated by the received NIT in step S150, and the number of matching relay station channels is predetermined. It is determined whether or not the threshold value is exceeded.

  If the number of matching relay station channels exceeds a predetermined threshold value, the table creation unit 14b considers that the broadcasting stations match in step S160, and updates the relay station channel of the matching broadcasting station using the relay station channel indicated by the NIT. Do. Thereby, for example, the state of the channel selection candidate table is updated from the state of FIG. 4A to the state of FIG. 4B.

  When the update is completed, in step S170, the search unit 14a controls the tuner 11 and the demodulation unit 12 to start reception using the relay station channel that has been successfully received. As a result, the user can view the broadcast program, and the process ends.

  Returning to step S150, the description will be made. When the number of matching relay station channels does not exceed the predetermined threshold, the table creation unit 14b regards the broadcast stations as not matching in step S151, and determines the channel selection candidate table. Add a broadcast station.

  Thereby, for example, the state of the channel selection candidate table is updated from the state of FIG. 4A to the state of FIG. In this example, the broadcasting station X is added as a broadcasting station different from the broadcasting station A but having the same TSID. When the addition is completed, the process proceeds to step S110, and the search for the relay station channel of the broadcasting station A is continued.

  In addition, when the broadcasting station X is newly added, the form which performs alerting | reporting with respect to a user may be sufficient. Or the form which outputs the message which confirms the necessity of allocation of the channel selection button with respect to the newly discovered broadcast station X, and waits for a user instruction | indication may be sufficient. Alternatively, the broadcast station X may be automatically assigned to a predetermined button.

  According to the present embodiment described above, the channel selection management table is updated when the relay station channel matches more than a predetermined value, and when the channel does not match, a new broadcast station and the relay channel of this broadcast station are selected. Add to the management table. As a result, it is possible to avoid a situation in which broadcast waves from a broadcast station different from the broadcast station designated by the user are received, resulting in user confusion.

Next, a second embodiment of the present invention will be described with reference to the drawings.
[Embodiment 2]
<2-1. Internal configuration>
Since it is the same content as Embodiment 1, description is abbreviate | omitted here.
<2-2. About the configuration of the function section>
Although it is the same structure as FIG. 1 of Embodiment 1, the functions of the table preparation part 14b and the update determination part 14c differ in part. As shown in FIG. 7, the table creation unit 14b according to the present embodiment generates a channel selection candidate table including the organization channel name.

  The organized channel name is identification information for identifying a plurality of broadcast services when one broadcast station provides a plurality of broadcast services using one physical channel. A broadcasting station can broadcast different programs using a plurality of broadcasting services, or can broadcast the same program.

  The organization channel name is described in an SDT (Service Description Table) included in the TS. The table creation unit 14b acquires the organization channel name from the SDT generated by the data filter 21 or the data decoder 22.

  Also, the update determination unit 14c of the present embodiment compares the organization channel name shown in the channel selection candidate table with the organization channel name shown in the received SDT. The table creation unit 14b updates the contents of the channel selection candidate table based on the comparison result. The update determination unit 14c determines that the broadcast stations are the same if, for example, all the organization channel names match. Alternatively, the broadcast station may be determined to be the same broadcast station if the ratio of the formed channel names is higher than a predetermined threshold, and may be determined to be a different broadcast station if the ratio is lower than the predetermined threshold. When it is determined that the broadcasting stations are the same, the table creation unit 14b refers to the NIT, and updates the relay station channel if it is necessary.

  Specifically, for example, it is assumed that the channel selection candidate table is in the state of FIG. 7A and the relay station information indicated by the SDT included in the received broadcast wave is the content of FIG. In this case, the organization channel names all match. For this reason, the update determination unit 14c determines that the broadcast wave of the same broadcast station as the broadcast station A has been received.

Further, for example, assume that the channel selection candidate table is in the state of FIG. 7A, and the relay station information indicated by the SDT included in the received broadcast wave has the content shown in FIG. 8B. In this case, the organization channel names do not match. For this reason, the update determination unit 14c determines that a broadcast wave of a broadcast station different from the broadcast station A has been received. In the above case, the table creation unit 14b updates the channel selection candidate table as shown in FIG. The relay station channel of the broadcasting station X is determined from the received NIT.
<2-3. Search process>
Here, a processing flow of search processing performed by the in-vehicle receiving device 100 according to the second embodiment of the present invention will be described with reference to the flowchart of FIG. The flow of the process is the same as the flowchart (FIG. 6) of the first embodiment, but step S141 is performed instead of step S150.

  In step S141, the update determination unit 14c compares the organization channel name indicated in the update management table with the organization channel name indicated by the received SDT. Then, it is determined whether or not the organization channel names match.

  If they match, the process proceeds to step S160. If they do not match, the table creation unit 14b considers that the broadcasting stations do not match in step S151, and adds a broadcasting station to the channel selection candidate table. Thereby, for example, the state of the channel selection candidate table is updated from the state of FIG. 7A to the state of FIG. The other processes are the same as those in the first embodiment, and thus description thereof is omitted.

According to this embodiment described above, the channel selection management table is updated when the organization channel names match, and when the channel names do not match, a new broadcast station and a relay channel of this broadcast station are added to the channel selection management table. To do. As a result, it is possible to avoid a situation in which broadcast waves from a broadcast station different from the broadcast station designated by the user are received, resulting in user confusion.
[Other embodiments]
The present invention has been described with reference to the preferred embodiments and examples. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea. be able to.

  Therefore, the present invention can also be applied to the following embodiments.

  (A) In the above embodiment, the in-vehicle receiving device 100 is described as an example of the digital broadcast receiving device that performs the search processing of the present invention, but the embodiment may be implemented in other digital broadcast receiving devices. For example, the embodiment may be implemented with a portable television or a cellular phone with a television.

  (B) In the above embodiment, each functional unit related to various processes of the present invention is realized by executing a predetermined program on an arithmetic processing unit such as a microprocessor. It may be a form realized by.

  (C) In the above embodiment, the deletion process of the information added to the update management table is not particularly described, but the information may be deleted based on the elapsed time or the use frequency. For example, after the addition of “Broadcasting station X” shown in FIG. 4C, when the “Broadcasting station X” has not been re-received even after one week has passed since it was last received, The data of “Station X” may be deleted.

  (D) In the above embodiment, when comparing the relay station channel of the update management table with the relay station channel of the NIT, it is considered that the broadcast stations match if the number of matches of the relay station channels exceeds a predetermined threshold. However, a form may be considered in which the broadcast station matches when the number of mismatches falls below a predetermined threshold. Alternatively, the broadcast station may be regarded as a match when the ratio of the mismatch count to the relay station channel match count is below a predetermined threshold.

  (E) In the above embodiment, an example is described in which there are four relay station channels for one broadcast station, but the number of relay station channels is not limited to this in actual operation. For example, a broadcasting station having ten to twenty relay station channels is also assumed. For this reason, the form and the ratio used for the above-described matching determination may be changed according to the number of relay station channels.

  (F) In the above embodiment, when there are a plurality of broadcast stations with the same TSID in the update management table, which broadcast station is preferentially used is not particularly defined. For this reason, a form in which some priority is set for each broadcast station and a relay station search is performed may be used. For example, when the in-vehicle receiving device 100 can connect a GPS (Global Positioning System) device, the position information is acquired by the GPS device when a new broadcasting station is added to the update management table. Then, the location information is recorded in the update management table in association with the added broadcasting station. When searching, the search unit 14a compares the current position information acquired by the GPS device with the position information recorded in the update management table, and determines a broadcast station with a closer position from the update management table. Then, the relay station search of the determined broadcasting station is performed. Thereby, the accuracy of the relay station search can be improved.

100 In-vehicle receiver (digital broadcast receiver)
11 Tuner (broadcast receiving part)
12 Demodulator (broadcast receiver)
13 Operation input unit 14 CPU
14a Search unit (reception control unit)
14b Table creation unit (information update unit)
14c Update determination unit 15 RAM (recording unit)
16 ROM
17 Audio Filter 18 Audio Decoder 19 Video Filter 20 Video Decoder 21 Data Filter 22 Data Decoder 23 Output Unit

Claims (7)

A broadcast receiver for receiving and selecting broadcast waves; and
A recording unit that records related information that associates broadcast wave identification information with a frequency band for receiving the broadcast wave;
Reception control that receives a channel selection instruction, determines a frequency band for receiving a broadcast wave instructed to be selected based on the related information, and controls the broadcast receiving unit to perform channel selection and reception using the determined frequency band And
Digital broadcasting comprising: an information updating unit that obtains relay station information indicating a frequency band of a relay station that relays a broadcast wave from the broadcast wave, and updates the related information using the frequency band indicated in the relay station information In the receiving device,
When channel selection by the broadcast receiving unit is performed and reception of the selected broadcast wave is successful, the frequency band of the broadcast wave indicated in the related information and the relay station acquired from the broadcast wave The digital broadcast receiver includes an update determination unit that compares the frequency band indicated in the information,
When the result of the comparison does not satisfy a predetermined condition, the information update unit includes identification information of a broadcast wave that has been successfully received, and a frequency band indicated in the relay station information acquired from the broadcast wave. A digital broadcast receiver characterized by adding information related to the related information. When the result of the comparison satisfies the condition, the information update unit is indicated in the related information using a frequency band indicated in the relay station information acquired from a broadcast wave that has been successfully received. The digital broadcast receiving apparatus according to claim 1, wherein the frequency band of the broadcast wave is updated. When the comparison result does not satisfy the condition, the reception control unit is indicated by the information update unit in the identification information of the broadcast wave successfully received and the relay station information acquired from the broadcast wave. When information relating to a frequency band is added to the related information, the broadcast receiving unit is controlled to retry channel selection in a frequency band different from the frequency band of the broadcast wave,
Further, when the result of the comparison satisfies the condition, the information update unit uses the frequency band indicated in the relay station information acquired from the broadcast wave that has been successfully received, to be indicated in the related information. The digital broadcast receiving apparatus according to claim 2, wherein when the frequency band of the broadcast wave is updated, the broadcast receiving unit is controlled to continue reception using the frequency band of the broadcast wave. In the update determination unit, as the condition, the number of matches between the frequency band indicated in the relay station information acquired from the broadcast wave successfully received and the frequency band of the broadcast wave indicated in the related information is Exceeding a predetermined threshold, or the number of mismatches in both frequency bands being below a predetermined threshold, or the ratio of the number of mismatches to the number of matches being below a predetermined threshold, The digital broadcast receiver according to claim 1, wherein the digital broadcast receiver is used as a condition. When the result of the comparison does not satisfy the condition, the information update unit is shown in the TSID (Transport Stream Id) of the broadcast wave that has been successfully received and the NIT (Network Information Table) included in the broadcast wave. The digital broadcast receiving apparatus according to claim 2, wherein information associated with a frequency band is added to the related information. The information updating unit obtains an organized channel name, which is information for identifying a plurality of broadcast services provided by a broadcast station in one frequency band, from the broadcast wave, and obtains the broadcast wave identification information and the broadcast wave from the broadcast wave Information related to the organized channel name that has been recorded is included in the related information and recorded in the recording unit,
When the channel selection by the broadcast receiving unit is successfully performed and the selected broadcast wave is successfully received, the update determination unit is configured to include the channel name of the broadcast wave indicated in the related information, Compare with the organization channel name obtained from the broadcast wave,
As a result of the comparison, when the composition channel names do not match or when the ratio of the composition channel names matches falls below a predetermined threshold, the information update unit acquires the composition obtained from the broadcast wave that has been successfully received. Adding information relating the channel name and the frequency band indicated in the relay station information acquired from the broadcast wave to the related information;
When the organization channel names match, or when the ratio of the organization channel names matches exceeds a predetermined threshold, the information update unit indicates the relay station information acquired from the broadcast wave that has been successfully received. The digital broadcast receiving apparatus according to claim 2, wherein the frequency band of the broadcast wave indicated in the related information is updated by using a frequency band that has been set. The reception control unit is obtained from the broadcast wave that has been successfully received by the information update unit when the composition channel names do not match or when the ratio that the composition channel names match falls below a predetermined threshold. When information that associates the organization channel name with the frequency band indicated in the relay station information acquired from the broadcast wave is added to the related information, the frequency band is different from the frequency band of the broadcast wave. Controlling the broadcast receiver to retry channel selection;
The relay station information acquired from the broadcast wave that has been successfully received by the information update unit when the set channel names match or when the ratio at which the set channel names match exceeds a predetermined threshold. When the frequency band of the broadcast wave indicated in the related information is updated, the broadcast receiving unit is controlled to continue reception using the frequency band of the broadcast wave. The digital broadcast receiver according to claim 6.

Images