JP6177679B2 - Broadcast receiver - Google Patents

Description

  The present invention relates to a broadcast receiver that receives program data according to the DAB (Digital Audio Broadcasting) broadcasting standard or the like.

  Conventionally, it has a receiving unit that receives broadcasting station information and traffic information, monitors the radio wave environment by electric field strength scan, performs frequency scan when it is determined that the radio wave environment is not normal, and receives it by the receiving unit A radio data system that updates a receivable broadcast station list (station list) based on broadcast station information is known (see, for example, Patent Document 1).

JP 2011-19041 A

  By the way, in the system disclosed in Patent Document 1, it is necessary to perform an electric field intensity scan in order to determine whether or not the broadcast station list is updated, and there is a problem that the processing is complicated. In addition, the update timing of the broadcast station list is changed according to the radio wave environment, and accordingly, the reception timing of TMC, which is other RDS data, is also changed, but the reception time of RDS data itself is the same as before, There was a problem that other RDS data could not be acquired efficiently.

  The present invention was created in view of the above points, and the purpose of the present invention is to update the broadcast station list quickly when necessary without adding complicated processing. An object of the present invention is to provide a broadcast receiver that can efficiently receive a data service by using.

In order to solve the above-described problems, a broadcast receiver according to the present invention includes a first tuner that receives a broadcast program, a search process that searches for a receivable broadcast station by sweeping the reception frequency band in a predetermined direction, and broadcast. In a broadcast receiver having a second tuner that selectively performs data service reception processing for receiving a data service of a station, a search processing unit that performs search processing, and a search result each time search processing is performed by the search processing unit The search result storage unit that stores the search result and the search result stored by the search processing unit and the search result stored in the search result storage unit are compared. And a processing rate setting unit for setting to reduce the rate of data service reception processing. A predetermined time is required to perform search processing corresponding to the reception frequency band, and the processing rate setting unit maintains the time required for search processing when there is a change in receivable broadcasting stations. At the same time, the search process requiring the required time is continuously repeated.

By comparing the results of repeated search processing, the presence or absence of changes in receivable broadcasting stations is determined, and the search processing rate is increased when there is a change. It is possible to update the broadcast station list by quickly performing a search process when necessary without adding any additional process. In addition, by continuously and repeatedly performing a search process that requires a required time, the search process can be performed in the shortest time and the latest broadcast station list can be reliably obtained.

  The processing rate setting unit described above compares the current search result by the search processing unit with the search result stored in the search result storage unit, and if there is no change in the receivable broadcast station, the search processing rate It is desirable to make a setting for reducing the ratio of the data service reception process and the data service reception process. When there is no change in receivable broadcasting stations, the rate of data service reception processing is increased, so that it is possible to efficiently receive data services using the interval between search operations (broadcast station list creation). Become.

  In addition, it is desirable that the processing ratio setting unit described above determines whether there is a change in receivable broadcast stations based on the number of receivable broadcast stations. Thus, it is possible to know whether there is a change in receivable broadcast stations by a simple process of comparing the number of broadcast stations.

In addition, when the receivable broadcasting station has not changed, the processing ratio setting unit described above maintains the time required for the search process and changes the time for performing the data service receiving process to a receivable broadcast station. It is desirable to make it longer than when there is. As a result, it is possible to efficiently receive the data service using the interval between search operations.

  The data service reception process described above preferably includes at least one acquisition process of electronic program guide data and TPEG (Transport Protocol Experts Group) data. As a result, when the receivable broadcast station changes, the broadcast station list is updated quickly, and when the receivable broadcast station does not change, the electronic program guide data and TPEG can be received efficiently and quickly. It becomes possible.

It is a figure which shows the structure of the DAB receiver of one Embodiment. It is a figure which shows the frame structure of a DAB broadcast signal. It is a flowchart which shows the operation | movement procedure which varies the ratio of a search process and a data service reception process based on the result of the search process which searches a receivable broadcasting station. It is explanatory drawing which shows the relationship between the change of the number of broadcasting stations, and an EPG data reception process.

  Hereinafter, a DAB (Digital Audio Broadcasting) receiver according to an embodiment to which a broadcasting receiver of the present invention is applied will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a DAB receiver according to an embodiment. As shown in FIG. 1, the DAB receiver of the present embodiment includes a first tuner 10, a second tuner 20, a decoder 30, an output processing unit 32, an amplifier 34, a speaker 36, a control unit 40, a display unit 50, and an operation unit. 52. This DAB receiver is mounted on a vehicle.

  The first tuner 10 is for receiving a broadcast program. Specifically, the first tuner 10 and the decoder 30 receive a digital broadcast signal (DAB broadcast signal) broadcast by a multi-carrier method using OFDM (Orthogonal Frequency Division Multiplexing) as a modulation method, and perform demodulation processing and decoding. Audio data is reproduced by performing the conversion process. For example, the first tuner 10 includes a front end (F / E) 12 and an analog-digital converter (A / D) 14. The front end 12 converts a broadcast signal received via the antenna 16 into an intermediate frequency signal. The analog-digital converter 14 converts an analog intermediate frequency signal into digital data (intermediate frequency data). The decoder 30 performs demodulation processing and decoding processing on the intermediate frequency data to generate audio data for each service.

  In this embodiment, the intermediate frequency signal output from the front end 12 is converted into digital data, and then the decoder 30 performs demodulation processing and decoding processing. However, up to which portion is performed by analog processing and which portion It can be appropriately changed whether the digital processing is performed.

  FIG. 2 is a diagram showing a frame configuration of a DAB broadcast signal. As shown in FIG. 2, a DAB broadcast signal frame is composed of a synchronization channel, a fast information channel FIC, and a main service channel MSC.

  The synchronization channel is composed of a NULL symbol and a phase reference symbol PRS (Phase Reference Symbol), and is used for frame synchronization by detecting the head portion of the frame. The first information channel FIC is an area for explaining the contents of the main service channel MSC, and includes time / date data, service (program) arrangement data, service label (name), service identification code SID (Service Identification). Code). A plurality of FIGs (first information groups) are energy-spread to form one FIB (first information block) which is a predetermined information unit. Each FIB is convolutionally encoded, and the three FIBs subjected to the convolutional coding constitute one FIC. The main service channel MSC mainly includes music data corresponding to each of a plurality of services. The main service channel MSC includes a plurality of sub-channels (SubCh) that are energy spread, convolutionally encoded, and time interleaved.

  The audio data output from the decoder 30 is input to the output processing unit 32, and performs variable control of volume, overlay processing of other sounds (for example, operation sounds), and the like. The amplifier 34 amplifies the audio data output from the output processing unit 32 and outputs the amplified audio from the speaker 36. Actually, it is necessary to convert the audio data after various processes in the output processing unit 32 into an analog audio signal. This conversion process may be performed in the output processing unit 32, or may be performed by providing a digital-analog converter in the subsequent stage of the output processing unit 32.

  The second tuner 20 is for receiving a DAB signal for performing a search process for searching for a receivable broadcast station and a data service reception process for receiving a data service of the broadcast station. Similar to the first tuner 10, the second tuner 20 includes a front end (F / E) 22 and an analog-digital converter (A / D) 24. The front end 22 converts a broadcast signal received via the antenna 16 into an intermediate frequency signal. The analog-digital converter 24 converts an analog intermediate frequency signal into digital data (intermediate frequency data).

  The control unit 40 controls the reception operation of the entire DAB receiver and performs search processing, data service reception processing, and the like. For this purpose, the control unit 40 includes a search processing unit 42, a search result storage unit 44, an EPG processing unit 46, and a processing ratio setting unit 48. It should be noted that the illustration regarding the configuration related to the control of the normal reception operation (the configuration necessary for the operation of selecting the service (program) to be received and the operation of displaying the received contents of the service being received) is omitted.

  The search processing unit 42 sweeps the reception frequency band in a predetermined direction, detects a plurality of ensembles included in the reception frequency band, and creates a list of broadcast stations corresponding to each ensemble. The search result storage unit 44 stores search results (broadcast station list) by the search processing unit 42. The EPG processing unit 46 examines the contents of a plurality of ensembles included in the reception frequency band, and creates an EPG (electronic program guide) that is a list of services (programs) included in each ensemble. In the present embodiment, EPG data reception processing is performed as data service reception processing, and an EPG is created by the EPG processing unit 46 using the received EPG data.

  The processing rate setting unit 48 compares the current search result by the search processing unit 42 with the search result stored in the search result storage unit 44, and if there is a change in the receivable broadcasting station, the processing rate And increase the data service reception processing ratio. The processing ratio setting unit 48 compares the current search result by the search processing unit 42 with the search result stored in the search result storage unit 44, and when there is no change in the receivable broadcasting station, A setting is made to decrease the ratio and increase the ratio of data service reception processing. The processing ratio setting unit 48 determines whether there is a change in receivable broadcast stations based on the number of receivable broadcast stations.

  The DAB receiver of this embodiment has such a configuration, and the operation thereof will be described next. FIG. 3 is a flowchart showing an operation procedure for changing the ratio of the search process and the data service reception process based on the result of the search process for searching for a receivable broadcasting station.

  The search processing unit 42 determines whether or not it is time to execute the search processing (step 100). For example, in the present embodiment, the search processing by the search processing unit 42 and the EPG data reception processing by the EPG processing unit 46 are performed almost alternately, and the start timing of the next search processing is at least during EPG data reception processing or search processing. Assume that you know.

  If the search process execution timing has not arrived, a negative determination is made in the determination of step 100, and this determination is repeated. Further, when the timing for executing the search process comes, an affirmative determination is made in the determination of step 100, and the search processing unit 42 executes the search process (step 102). After the search process is completed (or in parallel with the search process), the search result storage unit 44 stores the search process result (step 104).

  Next, the processing ratio setting unit 48 compares the current search result by the search processing unit 42 with the previous search result stored by the search result storage unit 44, and can receive a broadcast station (specifically, receivable). It is determined whether or not there is a change in the number of broadcast stations (step 106). If the reception quality (the radio wave condition) is stable and the number of broadcasting stations has not changed, a negative determination is made. In this case, the processing rate setting unit 48 sets the acquisition time of the next EPG data (EPG data reception processing time) longer while maintaining the time required for the search processing (step 108). The processing rate setting unit 48 instructs such setting to the search processing unit 42 and the EPG processing unit 46, thereby reducing the search processing rate and increasing the EPG data acquisition processing rate.

  Further, when the reception quality (the radio wave state) changes according to the traveling of the vehicle and the number of broadcasting stations changes, an affirmative determination is made in the determination of step 106. Next, the processing ratio setting unit 48 determines whether or not the change in the number of broadcasting stations is one (step 110). In the case of one station (when the change in the number of broadcasting stations is small), a positive determination is made. In this case, the processing ratio setting unit 48 sets the acquisition time of the next EPG data (EPG data reception processing time) short while maintaining the time required for the search processing (step 112). The processing rate setting unit 48 instructs the setting to the search processing unit 42 and the EPG processing unit 46 to increase the search processing rate and reduce the EPG data acquisition processing rate.

  When the change in the number of broadcasting stations is two or more (when the change in the number of broadcasting stations is large), a negative determination is made in the determination in step 110. In this case, the processing rate setting unit 48 maintains the required time required for the search process, and in addition to the EPG data reception process scheduled to be performed next, an instruction to continuously execute the search process is provided. (Step 114). Thereafter, the process returns to step 102 and the search process is immediately executed.

  Note that the above-described flowchart does not include the operation procedure of the EPG data reception process, but the EPG data reception process after the search process in step 102 is completed and until the next search process execution timing comes. Is done.

  FIG. 4 is an explanatory diagram showing the relationship between the change in the number of broadcast stations and the EPG data reception process. In FIG. 4, “Search” indicates the execution timing of the search process, and “EPG” indicates the execution timing of the EPG data reception process. Further, T0 is a required time required for performing the search process, and a certain time is ensured every time. T10 and T11 are times allocated to the execution of the EPG data reception process.

  As shown in FIG. 4A, when there is no change in the number of broadcasting stations by comparing the previous and current search results, the time T10 of the EPG data reception process performed after the current search process is: It is the same as the time T10 of the previous EPG data reception process, and is set longer than the time T11 (FIG. 4B) when the number of broadcasting stations has changed.

  Also, as shown in FIG. 4B, when the change in the number of broadcasting stations is 1 by comparing the previous and current search results, the time of the EPG data reception process performed after the current search process T11 is set to be shorter than the time T10 of the previous EPG data reception process or shorter than the time T10 of the EPG data reception process when the number of broadcasting stations has not changed (FIG. 4A).

  Further, as shown in FIG. 4C, when the change in the number of broadcasting stations is 2 or more by comparing the previous and current search results, the EPG data reception process that is originally performed after the current search process is performed. Is canceled and the next search process is continued instead.

  As described above, in the DAB receiver of this embodiment, the presence or absence of changes in receivable broadcasting stations is determined by comparing the results of repeated search processes, and if there is a change, the search process rate is increased. Therefore, the broadcast station list can be updated by quickly performing the search process when necessary without adding complicated processing such as scanning of the electric field intensity.

  In addition, when there is no change in receivable broadcasting stations, the ratio of EPG data reception processing is increased, so that EPG data can be efficiently received using the interval between search operations (broadcast station list creation). It becomes possible.

  In particular, the processing ratio setting unit 48 determines whether there is a change in receivable broadcast stations based on the number of receivable broadcast stations. Thus, it is possible to know whether there is a change in receivable broadcast stations by a simple process of comparing the number of broadcast stations.

  In addition, when a predetermined required time T0 is necessary for performing the search process corresponding to the reception frequency band, and the processing rate setting unit 48 does not change the receivable broadcasting station, the process ratio setting unit 48 is necessary for the search process. While maintaining the required time T0, the time T10 for performing the EPG data reception process is set to be longer than the time T11 when there is a change in the receivable broadcasting station. This makes it possible to efficiently receive EPG data using the interval between search operations.

  In addition, the processing ratio setting unit 48 maintains the required time T0 necessary for the search processing when there is a change in the receivable broadcasting station, and instructs to continuously and repeatedly perform the search processing that requires the required time T0. To the search processing unit 42. As a result, the search process can be performed in the shortest time, and the latest broadcast station list can be obtained reliably.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the above-described embodiment, reception of EPG data and creation of EPG are considered as a data service of a broadcasting station. However, it may be replaced with other data services, or may be performed in parallel or alternately. For example, as another data service, TPEG (Transport Protocol Experts Group) data may be received and displayed. This processing may be performed in parallel or alternately with the reception of the EPG data.

  In the above-described embodiment, the first tuner 10 is used for receiving a broadcast program, and the second tuner 20 is used for search processing and data service reception. However, a decoder is also provided at the subsequent stage of the second tuner 20. The broadcast program may be received separately in a two-system configuration, or may be diversity received. For diversity reception, it is desirable to provide separate antennas 16 for the first tuner 10 and the second tuner 20.

  As described above, according to the present invention, it is possible to determine whether there is a change in a receivable broadcasting station by comparing the results of repeated search processing, and to increase the search processing rate when there is a change. Therefore, the broadcast station list can be updated by quickly performing a search process when necessary without adding a complicated process such as a scan of electric field strength.

DESCRIPTION OF SYMBOLS 10 1st tuner 20 2nd tuner 30 Decoder 32 Output processing part 40 Control part 42 Search processing part 44 Search result memory | storage part 46 EPG processing part 48 Processing ratio setting part 50 Display part 52 Operation part

Claims (5)

A first tuner for receiving a broadcast program, a search process for searching for a receivable broadcast station by sweeping the reception frequency band in a predetermined direction, and a data service reception process for receiving a data service of the broadcast station are selectively performed. In a broadcast receiver having a second tuner,
A search processing unit for performing the search process;
A search result storage unit for storing a search result each time the search processing is performed by the search processing unit;
The current search result by the search processing unit is compared with the search result stored in the search result storage unit, and when there is a change in receivable broadcasting stations, the search processing rate is increased and the data A processing rate setting unit for setting to reduce the rate of service reception processing;
A predetermined time is required to perform the search process corresponding to the reception frequency band,
The treat rate setting unit, when there is a change in the receivable broadcasting stations, while maintaining the required time necessary for the search process, repeated continuously the search process takes the required time A broadcast receiver characterized by that. In claim 1,
The processing rate setting unit compares the current search result by the search processing unit with the search result stored in the search result storage unit, and if there is no change in receivable broadcasting stations, the rate of the search processing And a setting for increasing the ratio of the data service reception process. In claim 1 or 2,
The processing ratio setting unit determines whether or not a receivable broadcast station has changed based on the number of receivable broadcast stations. In any one of Claims 1-3,
The processing ratio setting unit maintains the required time required for the search process and changes the time for performing the data service reception process to a receivable broadcast station when there is no change in the receivable broadcast station. Broadcast receiver characterized in that it is longer than if there was. In any one of Claims 1-4 ,
The broadcast receiver according to claim 1, wherein the data service reception process includes an acquisition process of at least one of electronic program guide data and TPEG data.

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