WO2013014711A1 - デジタル放送受信機 - Google Patents
デジタル放送受信機 Download PDFInfo
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- WO2013014711A1 WO2013014711A1 PCT/JP2011/004244 JP2011004244W WO2013014711A1 WO 2013014711 A1 WO2013014711 A1 WO 2013014711A1 JP 2011004244 W JP2011004244 W JP 2011004244W WO 2013014711 A1 WO2013014711 A1 WO 2013014711A1
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- Prior art keywords
- service
- unit
- reception quality
- tuner
- received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
- H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/631—Multimode Transmission, e.g. transmitting basic layers and enhancement layers of the content over different transmission paths or transmitting with different error corrections, different keys or with different transmission protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/60—Aspects of broadcast communication characterised in that the receiver comprises more than one tuner
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
Definitions
- the present invention relates to a digital broadcast receiver having a plurality of tuner sections.
- the digital broadcast receiver described in Patent Document 1 includes a plurality of tuner units, and appropriately switches between the double tuner reception mode and the diversity reception mode using these tuner units.
- the reception quality of a service being received may deteriorate due to a change in the reception environment accompanying movement.
- the transition candidate service that substitutes for the service is searched in the background to create a service list that summarizes the transition candidate services. Then, services can be switched smoothly based on the service list.
- the service list transition candidate service suddenly deteriorates in reception quality and the reception quality becomes worse than the service being received, the service is switched according to the contents of the service list before the update. There is a possibility that the reception quality is deteriorated as compared with the current situation.
- the reception quality of the transition candidate service is sufficiently better than when it was registered in the service list, it is not possible to switch to the transition candidate service with good reception quality until the service list is updated. There is also a possibility.
- Patent Document 1 is a receiving apparatus that operates by switching between the double tuner reception mode and the diversity reception mode, and therefore, it is possible to solve the problems caused by the service list update as described above. Can not.
- the present invention has been made in order to solve the above-described problems. It is an object of the present invention to obtain a digital broadcast receiver that can appropriately determine whether or not a service that is currently being received should be changed to a transition candidate service. Objective.
- the digital broadcast receiver substitutes a first tuner unit that receives a digital broadcast of a service to be viewed and a channel different from the service received by the first tuner unit.
- a second tuner unit that searches for a transition candidate service to be performed, a first signal determination unit that determines reception quality of a service that is received by the first tuner unit, and a service that is received by the second tuner unit.
- the second signal determination unit for determining the reception quality of the received signal, the memory unit for storing the transition candidate service searched by the second tuner unit, and the first tuner unit for reception by the first signal determination unit If it is determined that the reception quality of the service has deteriorated, the second tuner unit receives the service transition candidate service stored in the memory unit, and the second signal determination unit Based on the reception quality of the determination result of the transition candidate service, and a determining switching determination unit that determines whether switching to the transition candidate service a service in which the first tuner is receiving.
- FIG. 4 is a flowchart illustrating a reception service change process by the digital broadcast receiver according to the first embodiment. It is a figure which shows an example of the criterion of service switching. It is a figure which shows the change of the service area of the broadcasting station by driving
- FIG. FIG. 2 is a block diagram showing a configuration of the digital broadcast receiver according to Embodiment 1 of the present invention, and shows a digital broadcast receiver for a mobile body mounted on a mobile body (for example, a vehicle).
- the digital broadcast receiver 1 according to Embodiment 1 includes a receiving tuner unit 3a using an antenna 2a, a back search tuner unit 3b using an antenna 2b, and a signal processing unit 4.
- the back search in the present invention substitutes the service from the channels different from the service in the background while the reception tuner unit 3a receives the digital broadcast of the service that the user views.
- a service with the same content is being broadcast (simultaneously) on a different channel, if the service is being received as a service to be viewed by the user, the service with the same content on a different channel from that service transitions.
- the receiving tuner unit 3a is a component that receives a digital broadcast of a service that a user views through the antenna 2a, and includes a tuner 5a and a detection unit 6a.
- the tuner 5a selects a broadcast wave channel received by the antenna 2a, and converts the broadcast wave signal received by the antenna 2a into an IF (intermediate frequency) signal.
- the detection unit 6a performs analog / digital (A / D) conversion on the IF signal input from the tuner 5a to obtain digital data, and performs the FFT (fast Fourier calculation) on the signals of the I component and the Q component that are orthogonally modulated and frequency tuned ) To obtain a detection signal.
- the back search tuner unit 3b is a component that performs a back search via the antenna 2a, and includes a tuner 5b and a detection unit 6b.
- the tuner 5b selects a broadcast wave channel received by the antenna 2b, and converts the broadcast wave signal received by the antenna 2a into an IF signal.
- the detection unit 6b performs A / D conversion on the IF signal input from the tuner 5b, and converts the signals of the I component and the Q component that have been subjected to quadrature modulation and frequency tuning into a frequency signal by FFT to obtain a detection signal. Both detection signals from the receiving tuner unit 3a and the back search tuner unit 3b are sent to the signal processing unit 4 in the subsequent stage.
- the signal processing unit 4 is a signal processing unit that processes signals input from the receiving tuner unit 3a and the back search tuner unit 3b, and includes a decoder unit 7, tuner control units 8a and 8b, signal determination units 9a and 9b, and a list.
- a creation unit 10, a memory unit 11, and a switching determination unit 12 are provided.
- the decoder unit 7 demodulates video, audio, and data based on the detection signal from the receiving tuner unit 3a. Video output and audio output from the decoder unit 7 is provided as video and audio by a video display device (not shown) in the subsequent stage.
- the tuner control unit 8a is a control unit that controls the tuning of the tuner 5a of the receiving tuner unit 3a
- the tuner control unit 8b is a control unit that controls the tuning of the tuner 5b of the back search tuner unit 3b.
- the signal determination unit 9a is a component that determines the reception quality of the detection signal from the reception tuner unit 3a, in order to grasp the reception quality of the determination result (such as the index value of the received electric field strength). Is stored in the memory unit 11.
- the signal determination unit 9b is a component that determines the reception quality of the detection signal from the back search tuner unit 3b, and grasps the reception quality of the determination result (such as the index value of the received electric field strength). The value for) is similarly stored in the memory unit 11.
- the list creation unit 10 creates a back search list including the ID, service name, and reception quality of the reception service of the transition candidate extracted from the detection signal of the back search tuner unit 3b. The back search list is stored in the memory unit 11. Details of the back search list will be described later with reference to FIG.
- the memory unit 11 receives the reception quality determination result of the service received by the reception tuner unit 3a, the reception quality determination result of the service received by the back search tuner unit 3b, and the back search list created by the list creation unit 10. Is stored. Based on the information stored in the memory unit 11, the switching determination unit 12 is received by the back search tuner unit 3b based on the reception quality of the service being received by the reception tuner unit 3a and the back search list. The reception quality of the services is compared, it is determined whether or not the receiving tuner unit 3a should change the service being received, and the service is switched based on the determination result.
- the switching determination unit 12 determines that a service change is necessary, the switching determination unit 12 instructs the tuner control unit 8a to tune the tuner 5a to the changed service. In addition, the switching determination unit 12 instructs the tuner control unit 8b to perform tuning control on the tuner 5b of the back search tuner unit 3b so that the search operation is always performed.
- FIG. 3 is a diagram illustrating an example of the back search list.
- the back search list shows service reception quality such as SID (service ID), service name, channel number, and reception quality (reception field strength index value) for identifying a broadcast program service. (Value for grasping) is information listed.
- the back search list describes a service being received and a service that is a transition candidate for this service. For example, when “Service BBB” of channel ch 37 is received, and “Service BBB” of channel ch 62 having the same content is detected by the reverse search, “Service BBB” of channel ch 62 is changed to “Service BBB” of channel ch 37. It becomes a transition candidate for BBB ′′. That is, when the reception quality of the channel ch 37 is being reduced while the “Service BBB” is being received, the service is changed to the service of the channel ch 62 in the reverse search list.
- FIG. 4 is a flowchart showing reception service change processing by the digital broadcast receiver according to the first embodiment.
- the signal determination unit 9a determines the reception quality of the service being received while the reception tuner unit 3a is receiving the service (step ST1).
- a value for grasping the reception quality of the currently received service such as an index value of the received electric field strength
- the determination result is the memory unit. 11 are sequentially stored.
- the threshold value is a value indicating reception quality at which service switching should be performed.
- a value obtained by adding a margin value to a lower limit value of a signal quality range that can be received by the receiving tuner unit 3a (for example, a range of values obtained by indexing the received electric field strength) can be considered.
- the threshold value may be set by the user using an input means (not shown in FIG. 2).
- the receiving tuner unit 3 a is described as “tuner (front)”
- the back search tuner unit 3 b is described as “tuner (back)”.
- step ST1 determines from the determination result by the signal determination unit 9a that the value for determining the reception quality of the currently received service is less than the above threshold value (step ST1; YES)
- the memory unit It is determined whether there is a transition candidate service having the same content as the service currently being received in the back search list stored in 11 (step ST2). If there is a transition candidate service in the back search list (step ST2; YES), the process proceeds to step ST5.
- step ST1; NO when the value for grasping the reception quality of the currently received service is equal to or higher than the above threshold (step ST1; NO), or when there is no transition candidate service in the back search list (step ST2; NO), switching The determining unit 12 instructs the tuner control unit 8b to continue the back search by the back search tuner unit 3b (step ST3).
- the list creation unit 10 extracts the ID, service name, reception quality, and the like of the transition candidate reception service from the signal obtained by the back search of the back search tuner unit 3b, and based on this, the memory unit 11 back search lists are updated (step ST4).
- the switching determination unit 12 instructs the tuner control unit 8b to stop the back search operation of the back search tuner unit 3b (step ST5).
- the switching determination unit 12 instructs the tuner control unit 8b to synchronize the back search tuner unit 3b with the transition candidate service in the back search list (step ST6).
- the signal determination unit 9b determines the reception quality of the transition candidate service being received by the back search tuner unit 3b (step ST7). Here, it is determined whether or not a value (such as an index value of received electric field strength) for grasping the reception quality of the transition candidate service is equal to or higher than the threshold value, and the determination result is sequentially stored in the memory unit 11.
- step ST7 When the value for grasping the reception quality of the transition candidate service is less than the above threshold value (step ST7; NO), it is not possible to improve the reception quality even when switching from the service currently being received. The process is terminated without switching. This is considered to be the case where the reception environment has changed since the reverse search list was created and the reception quality of the transition candidate service has deteriorated.
- the switching determination unit 12 determines from the determination result by the signal determination unit 9b that the value for determining the reception quality of the transition candidate service is equal to or greater than the threshold value (step ST7; YES)
- the tuner control The unit 8a is instructed to tune the receiving tuner unit 3a to the transition candidate service (step ST8). Thereafter, the back search tuner unit 3b restarts the back search operation.
- switching to the transition candidate service is performed based on the reception quality determined in the real-time reception environment, so whether or not to change from the currently received service to the transition candidate service. Can be determined appropriately.
- the switching determination unit 12 determines the reception quality determination result (the determination by the signal determination unit 9a) of the service currently being received by the reception tuner unit 3a in addition to the determination result by the signal determination unit 9b. Together with the result, it may be determined whether or not it is possible to switch to the transition candidate service.
- FIG. 5 is a diagram illustrating an example of determination criteria for service switching. The switching determination unit 12 determines switching to the transition candidate service based on the determination criterion as illustrated in FIG. (1) If the value for grasping the reception quality of the service currently being received is less than the above threshold value, and the value for grasping the reception quality of the transition candidate service is less than the above threshold value, the switching determination unit 12 , Switching to the transition candidate service is disabled.
- the switching determination unit 12 Switching to a transition candidate service is allowed.
- the switching determination unit 12 switches to the transition candidate service is disabled.
- the value for grasping the reception quality of the service currently being received is equal to or greater than the threshold value and the value for grasping the reception quality of the transition candidate service is also equal to or greater than the threshold value, the current reception is in progress.
- the transition candidate service If the value for grasping the reception quality of the service is equal to or greater than the value for grasping the reception quality of the transition candidate service, switching to the transition candidate service is disabled. If the value for grasping the reception quality of the service currently being received is less than the value for grasping the reception quality of the transition candidate service, switching to the transition candidate service is permitted.
- FIG. 6 is a diagram showing a change in the service area of the broadcasting station due to the traveling of the vehicle equipped with the digital broadcast receiver according to the first embodiment.
- the service “Service BBB” of channel ch 37 transmitted by a broadcasting station (transmitting station) around point A is received (viewed) by the digital broadcast receiver 1 mounted on the vehicle 13, A case where the vehicle is traveling toward the point B is shown.
- the traveling route of the vehicle 13 has a point P between points A and B.
- the broadcasting stations (transmitting stations) around the point B broadcast the service “Service BBB” having the same content on the channel ch 62, and the back search list includes a transition candidate service for the service of the channel ch 37 being received. It is assumed that the service of channel ch62 is registered.
- FIG. 7A shows the reception quality of the service “Service BBB” (for example, a value obtained by indexing the received electric field strength) of the channel ch 37 transmitted by the transmitting stations around the point A in FIG. It is a graph which shows a change.
- the receiving tuner unit 3a can receive a reception quality index value of “3” or more. Accordingly, when the vehicle 13 is traveling near the point A, the service of the channel ch 37 can be received, but the reception quality suddenly decreases from the vicinity of the point P and cannot be received.
- FIG. 7B is a graph showing a change in the reception quality of the service “Service BBB” of the channel ch 62 transmitted by the transmitting stations around the point B in FIG. 6 on the travel route. As shown in FIG. 7B, the reception quality of the service of the channel ch 62 starts to increase from the vicinity of the point A, and when it reaches the vicinity of the point P, the reception tuner unit 3a can already receive.
- the reception quality of the channel ch62 is registered as a transition candidate service for the service of the channel ch37.
- the reverse search list is not updated, the reception quality of the service of the channel ch 62 is conventionally reversed to the reception quality of the channel ch 37.
- the determination is made based on the contents of the back search list at that time, and there is a possibility that the change to the service of the channel ch 62 is not performed. Therefore, in the present invention, since the following switching determination is performed, appropriate service switching is possible according to a change in real-time reception quality.
- FIG. 8 is a diagram illustrating the reception quality in the travel route of the vehicle at the time of switching to the transition candidate service.
- FIG. 8A shows a change in the reception quality of the service of the channel ch 37 received by the reception tuner unit 3a.
- the signal determination unit 9a determines whether or not the value for grasping the reception quality of the service of the channel ch37 is less than the threshold value a while the reception tuner unit 3a receives the service of the channel ch37. Yes.
- the reception quality of the service of the channel ch 37 suddenly decreases from the vicinity of the point P and is less than the threshold value a.
- the back search tuner unit 3b is controlled to stop the back search operation and receive the transition candidate service. .
- FIG. 8B shows a change in the reception quality of the service of the channel ch62 received by the back search tuner unit 3b.
- the signal determination unit 9b has a value for grasping the reception quality of the transition candidate service equal to or higher than the threshold value a. It is determined whether or not.
- the value for grasping the reception quality of the service (channel ch37) being received by the reception tuner unit 3a is less than the threshold value a
- the value for grasping the reception quality of the transition candidate service (channel ch62) being received by the back search tuner unit 3b is equal to or greater than the threshold value a.
- the switching determination unit 12 determines that the reception quality of the transition candidate service is sufficiently high, and switches the service received by the reception tuner unit 3a to the transition candidate service. Thereafter, the back search tuner unit 3b restarts the back search operation.
- the receiving tuner unit 3a that receives the digital broadcast of the service to be viewed and the service that is received by the receiving tuner unit 3a are selected from different channels.
- the back search tuner unit 3b that searches for a transition candidate service that substitutes for the service, the signal determination unit 9a that determines the reception quality of the service received by the reception tuner unit 3a, and the back search tuner unit 3b The signal judging unit 9b for judging the reception quality of the service being performed, the memory unit 11 for storing the transition candidate service searched by the back search tuner unit 3b, and the receiving tuner unit 3a receiving the signal judging unit 9a If it is determined that the received quality of the service that has been deteriorated, the transition candidate service of the service stored in the memory unit 11 is stored The receiver tuner unit 3b, and based on the determination result of the reception quality of the transition candidate service by the signal determination unit 9b, it is determined whether to switch the service received by the reception tuner unit 3a to the transition candidate service And a
- the back search tuner unit 3b searches for a service having the same content as the service received by the reception tuner unit 3a as a transition candidate service. By doing in this way, the service of the same content can be automatically switched according to reception quality.
- any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.
- the digital broadcast receiver according to the present invention can appropriately determine whether or not the service currently being received should be changed to the transition candidate service, the reception status may change depending on the traveling of the vehicle. It is suitable for a digital broadcast receiver.
- 1 Digital broadcast receiver 2a, 2b antenna, 3a reception tuner unit, 3b back search tuner unit, 4 signal processing unit, 5a, 5b tuner, 6a, 6b detection unit, 7 decoder unit, 8a, 8b tuner control unit , 9a, 9b Signal determination unit, 10 list creation unit, 11 memory unit, 12 switching determination unit, 13 vehicle.
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Abstract
Description
例えば、欧州DVB-T放送の場合には、図1に示すようにch21からch62までの41ものチャンネルが存在し、サービスリストを更新するには41チャンネル分の同調および信号判定を行う必要がある。このため、サービスリストの更新に約1分~3分程度の時間がかかる。
従って、サービスリストに登録された遷移候補サービスのうち、最大で3分前の情報に基づいて、サービスの切り替えが判定される。
すなわち、サービスリストの遷移候補サービスが急激に受信品質が劣化して、受信中のサービスよりも受信品質が悪くなった場合であっても、更新前のサービスリストの内容に従ってサービスが切り替えられてしまい、現状よりも受信品質が劣化する可能性がある。
反対に、サービスリストへ登録された時点よりも、遷移候補サービスの受信品質が十分良好になっていても、当該サービスリストが更新されるまで、受信品質が良好な遷移候補サービスへ切り替えができない場合もあり得る。
実施の形態1.
図2は、この発明の実施の形態1に係るデジタル放送受信機の構成を示すブロック図であり、移動体(例えば車両)に搭載した移動体向けのデジタル放送受信機を示している。図2において、実施の形態1に係るデジタル放送受信機1は、アンテナ2aを用いた受信用チューナ部3a、アンテナ2bを用いた裏サーチ用チューナ部3bおよび信号処理部4を備える。
本発明における裏サーチとは、ユーザが視聴を行うサービスのデジタル放送を受信用チューナ部3aが受信している間に、そのバックグラウンドで当該サービスとは異なるチャンネルの中から、当該サービスを代替するサービス(以下、遷移候補サービスと呼ぶ)をサーチする動作である。例えば、ジャンルが同じサービスを遷移候補サービスとする。
なお、異なるチャンネルで同一内容のサービスが放送(サイマルキャスト)されている場合は、そのいずれかをユーザが視聴するサービスとして受信中であれば、当該サービスと異なるチャンネルでかつ同一内容のサービスが遷移候補サービスとなる。
受信用チューナ部3aおよび裏サーチ用チューナ部3bからの検波信号は、ともに後段の信号処理部4へ送られる。
デコーダ部7は、受信用チューナ部3aからの検波信号に基づいて映像、音声、データの復調を行う。デコーダ部7からの映像出力および音声出力は、後段にある不図示の映像表示装置などで映像音声が提供される。
チューナ制御部8aは、受信用チューナ部3aのチューナ5aを同調制御する制御部であり、チューナ制御部8bは、裏サーチ用チューナ部3bのチューナ5bを同調制御する制御部である。
一方、信号判定部9bは、裏サーチ用チューナ部3bからの検波信号の受信品質を判定する構成部であり、判定結果の受信品質(受信電界強度の指標値など、サービスの受信品質を把握するための値)は、同様にメモリ部11に格納される。
リスト作成部10は、裏サーチ用チューナ部3bの検波信号から抽出された遷移候補の受信サービスのID、サービス名およびその受信品質を含む裏サーチリストを作成する。裏サーチリストは、メモリ部11に格納される。なお、裏サーチリストの詳細は、図3を用いて後述する。
切り替え判定部12は、メモリ部11に記憶された情報に基づいて、受信用チューナ部3aが受信中のサービスの受信品質と、裏サーチリストを基に裏サーチ用チューナ部3bが受信しているサービスの受信品質を比較し、受信用チューナ部3aが受信中のサービスを変更すべきか否かを判定し、その判定結果に基づいてサービスを切り替える。
なお、切り替え判定部12は、サービス変更が必要であると判定すると、チューナ制御部8aに指示して、変更後のサービスにチューナ5aを同調制御する。また、切り替え判定部12は、チューナ制御部8bに指示して、裏サーチ用チューナ部3bのチューナ5bに同調制御を行い、常にサーチ動作を行わせる。
また、裏サーチリストには、受信中のサービスおよびこのサービスに対する遷移候補となるサービスが記載される。例えば、チャンネルch37の“Service BBB”を受信しているとき、裏サーチにより同一内容のチャンネルch62の“Service BBB”が検出された場合、このチャンネルch62の“Service BBB”が、チャンネルch37の“Service BBB”に対する遷移候補となる。
すなわち、チャンネルch37の“Service BBB”を受信中に、車両の走行等によりその受信品質が低下してきた場合、裏サーチリストにおけるチャンネルch62のサービスへ変更される。
図4は、実施の形態1に係るデジタル放送受信機による受信サービスの変更処理を示すフローチャートである。
まず、信号判定部9aは、受信用チューナ部3aがサービスを受信している間、受信中のサービスの受信品質を判定する(ステップST1)。ここでは、現在受信中のサービスの受信品質を把握するための値(受信電界強度の指標値など)が、この受信品質に関する所定の閾値未満になったか否かが判定され、判定結果はメモリ部11に逐次格納される。
上記閾値は、サービス切り替えを行うべき受信品質を示す値である。例えば、受信用チューナ部3aが受信可能な信号品質範囲(例えば、受信電界強度を指標化した値の範囲)の下限値に余裕値を加算した値が考えられる。また、上記閾値は、入力手段(図2において不図示)を用いてユーザが任意のレベルを設定できるようにしてもよい。
なお、図4において、受信用チューナ部3aを“チューナ(表)”と記載し、裏サーチ用チューナ部3bを“チューナ(裏)”と記載する。
裏サーチリストに遷移候補サービスがある場合(ステップST2;YES)、ステップST5の処理へ移行する。
次に、リスト作成部10が、裏サーチ用チューナ部3bの裏サーチで得られた信号から遷移候補の受信サービスのID、サービス名、およびその受信品質などを抽出し、これを基にメモリ部11の裏サーチリストを更新する(ステップST4)。
信号判定部9bは、裏サーチ用チューナ部3bが受信中の遷移候補サービスの受信品質を判定する(ステップST7)。ここでは、遷移候補サービスの受信品質を把握するための値(受信電界強度の指標値など)が上記閾値以上になったか否かが判定され、判定結果がメモリ部11に逐次格納される。
これは、裏サーチリストが作成された時点から受信環境が変化して、遷移候補サービスの受信品質が劣化した場合が考えられる。
このように、実施の形態1では、リアルタイムな受信環境で判定された受信品質を基準として、遷移候補サービスへの切り替えが行われるので、現在受信中のサービスから遷移候補サービスへ変更すべきか否かを適切に判定することができる。
図5は、サービス切り替えの判定基準の一例を示す図である。切り替え判定部12は、図5に示すような判定基準で遷移候補サービスへの切り替えを判定する。
(1)現在受信中のサービスの受信品質を把握するための値が上記閾値未満であり、かつ遷移候補サービスの受信品質を把握するための値が上記閾値未満である場合、切り替え判定部12は、遷移候補サービスへの切り替えを不可とする。
(2)現在受信中のサービスの受信品質を把握するための値が上記閾値未満であり、かつ遷移候補サービスの受信品質を把握するための値が上記閾値以上である場合、切り替え判定部12は、遷移候補サービスへの切り替えを可とする。
(3)現在受信中のサービスの受信品質を把握するための値が上記閾値以上であり、かつ遷移候補サービスの受信品質を把握するための値が上記閾値未満である場合、切り替え判定部12は、遷移候補サービスへの切り替えを不可とする。
(4)現在受信中のサービスの受信品質を把握するための値が上記閾値以上であり、かつ遷移候補サービスの受信品質を把握するための値も上記閾値以上である場合においては、現在受信中のサービスの受信品質を把握するための値が、遷移候補サービスの受信品質を把握するための値以上であると、遷移候補サービスへの切り替えを不可とする。
また、現在受信中のサービスの受信品質を把握するための値が、遷移候補サービスの受信品質を把握するための値未満であると、遷移候補サービスへの切り替えを可とする。
図6は、実施の形態1に係るデジタル放送受信機を搭載した車両の走行による放送局のサービスエリアの変化を示す図である。図6の例は、A点周辺の放送局(送信所)が送信するチャンネルch37のサービス“Service BBB”を、車両13に搭載したデジタル放送受信機1で受信(視聴)しながら、ルート上を走行してB点へ向かっている場合を示している。なお、車両13の走行ルートにはA点とB点の間にP点が存在する。
また、B点周辺の放送局(送信所)は、チャンネルch62で同一内容のサービス“Service BBB”を放送しており、裏サーチリストには、受信中のチャンネルch37のサービスに対する遷移候補サービスとして、チャンネルch62のサービスが登録されているものとする。
従って、車両13がA点付近を走行している場合は、チャンネルch37のサービスを受信できるが、P点付近から急激に受信品質が低下して受信できなくなる。
また、図7(b)は、図6中のB点周辺の送信所が送信しているチャンネルch62のサービス“Service BBB”の受信品質の走行ルート上での変化を示すグラフである。図7(b)に示すように、チャンネルch62のサービスの受信品質は、A点付近から上昇し始め、P点付近になると既に受信用チューナ部3aで受信可能になっている。
この場合、車両13がP点付近まで走行したとき、裏サーチリストの更新が実施されていなければ、従来では、チャンネルch62のサービスの受信品質が、チャンネルch37の受信品質を逆転しているにもかかわらず、その時点の裏サーチリストの内容に基づいて判定され、チャンネルch62のサービスへの変更が実施されない可能性がある。
そこで、本発明では、以下のような切り替え判定を行うため、リアルタイムな受信品質の変化に応じて適切なサービスの切り替えが可能である。
信号判定部9aは、受信用チューナ部3aがチャンネルch37のサービスを受信している間、チャンネルch37のサービスの受信品質を把握するための値が、閾値a未満になったか否かを判定している。
図8(a)に示すように、チャンネルch37のサービスの受信品質は、P点付近から急激に低下して閾値a未満になっている。このとき、裏サーチリストには、遷移候補サービスとしてチャンネルch62のサービスが登録されているので、裏サーチ用チューナ部3bは、裏サーチ動作を停止し、当該遷移候補サービスを受信するよう制御される。
ここでは、図8(a)および図8(b)に示すように、受信用チューナ部3aが受信中のサービス(チャンネルch37)の受信品質を把握するための値が閾値a未満になり、かつ、裏サーチ用チューナ部3bが受信中の遷移候補サービス(チャンネルch62)の受信品質を把握するための値が閾値a以上となっている。
この場合、切り替え判定部12は、遷移候補サービスの受信品質が十分に高いと判断して、受信用チューナ部3aが受信するサービスを、当該遷移候補サービスに切り替えさせる。この後、裏サーチ用チューナ部3bは、裏サーチ動作を再開する。
つまり、チャンネルch37の“Service BBB”が放送される放送エリア内のA点と、チャンネルch62の“Service BBB”が放送される放送エリア内のB点とを結ぶルート上の双方の放送エリアが重なる領域にあるP点付近で、チャンネルch37からチャンネルch62へ自動的に放送局が切り替わる。これにより、車両13のユーザは、サービス“Service BBB”を視聴し続けることができる。
Claims (2)
- 視聴を行うサービスのデジタル放送を受信する第1のチューナ部と、
前記第1のチューナ部が受信しているサービスとは異なるチャンネルの中から、当該サービスを代替する遷移候補サービスをサーチする第2のチューナ部と、
前記第1のチューナ部が受信しているサービスの受信品質を判定する第1の信号判定部と、
前記第2のチューナ部が受信しているサービスの受信品質を判定する第2の信号判定部と、
前記第2のチューナ部によりサーチされた遷移候補サービスを記憶するメモリ部と、
前記第1の信号判定部により前記第1のチューナ部が受信しているサービスの受信品質が劣化したと判定されると、前記メモリ部に記憶される当該サービスの遷移候補サービスを前記第2のチューナ部に受信させ、前記第2の信号判定部による当該遷移候補サービスの受信品質の判定結果に基づいて、前記第1のチューナ部が受信しているサービスを当該遷移候補サービスへ切り替えるか否かを判定する切り替え判定部とを備えたデジタル放送受信機。 - 前記第2のチューナ部は、前記第1のチューナ部が受信しているサービスと同一内容のサービスを遷移候補サービスとしてサーチすることを特徴とする請求項1記載のデジタル放送受信機。
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JP2017028425A (ja) * | 2015-07-21 | 2017-02-02 | アルプス電気株式会社 | 受信装置 |
US11711568B2 (en) | 2021-08-06 | 2023-07-25 | Sony Group Corporation | Techniques for ATSC 3.0 broadcast boundary area management using plural tuners handing off between presentation and scanning |
US11848716B2 (en) | 2021-08-06 | 2023-12-19 | Sony Group Corporation | Techniques for ATSC 3.0 broadcast boundary area management using signal quality and packet errors to differentiate between duplicated services on different frequencies during scan |
WO2023012756A1 (en) * | 2021-08-06 | 2023-02-09 | Sony Group Corporation | Techniques for atsc 3.0 broadcast boundary area management using plural tuners handing off between presentation and scanning |
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