JP5570896B2 - Digital broadcast receiving apparatus, digital broadcast receiving method, computer program, and computer-readable storage medium - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus, a digital broadcast receiving method, a computer program for realizing the digital broadcast receiving method, and a computer program for realizing the digital broadcast receiving method for receiving a data block of data transmitted by the data carousel method. The present invention relates to a recorded computer-readable recording medium.

  In recent years, various terrestrial digital broadcasting services such as data broadcasting using a markup language called BML (Broadcast Markup Language) have been provided. The data carousel method is used as a content download method in multimedia broadcasting using the VHF (Very High Frequency) -Low band of ISDB-Tsb (Integrated Services Digital Broadcasting-Terrestrial for Sound Broadcasting) method adopted in terrestrial digital radio broadcasting It has been proposed to use

  In the data carousel method, data is divided into data blocks of a predetermined size, and each data block is repeatedly transmitted at a constant period. If the data carousel method is adopted, even if the digital broadcast receiver cannot receive a data block, the data block is transmitted again from the broadcast station by waiting for a certain period. Can be received (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2005-102004

  However, in the above-described conventional technology, the digital broadcast receiving apparatus continuously receives data blocks that can be normally received while waiting for data blocks that could not be received last time to be transmitted again. There was a problem in terms of power consumption of the digital broadcast receiver.

  For example, in a content download service, it is conceivable that a broadcast station transmits a large amount of data using a transport stream (TS) dedicated to download. When the digital broadcast receiving apparatus fails to acquire the data block, the digital broadcast receiving apparatus receives the data block that has failed to acquire. Therefore, it is necessary to continuously receive the data block of the transport stream transmitted by the data carousel method from the same broadcasting station. is there. For this reason, the digital broadcast receiving apparatus cannot receive other transport streams, and as a result, it cannot view the broadcasts of other broadcast stations, which impairs user convenience.

  FIG. 6 is a diagram schematically showing data reception timing in the data carousel method. FIG. 6 shows data reception timing in one-segment data broadcasting and data reception timing in multimedia broadcasting. FIG. 7 is a diagram for explaining a data block configuration method in the data carousel method.

  The data blocks (DII, DDB0, DDB1, DDB2, DDB3, DDB4, DDB5, DDB6, DDB7, DDB8,..., DDBn) shown in FIG. It is configured by concatenating the included data. DII is an abbreviation for DownloadInfoIndication, meaning that it is a data block that contains control information related to download, and DDB is an abbreviation for Download Data Block, meaning that it is data to be downloaded divided into multiple blocks. To do.

  As shown in FIG. 6, in the example of one-segment data broadcasting, data blocks (DII, DDB0, DDB1, DDB2, and DDB3) transmitted by a broadcasting station by the data carousel method are received at a constant period by a receiver. This period is about several seconds to several tens of seconds. In 1Seg, a data block of data broadcasting is multiplexed with video data by the same TS packet as the TS packet for transmitting video data and transmitted from the broadcasting station. Therefore, the user can view the video until the data block that failed to be acquired is retransmitted by the broadcast station and received by the digital broadcast receiver, and the data block that failed to acquire is received by digital broadcast. It is characterized in that the time until the device receives is short.

  On the other hand, in multimedia broadcasting, it has been proposed to provide a large-capacity content download service in a dedicated segment. In this case, as shown in FIG. 6, the number of data blocks (DII, DDB0, DDB1, DDB2, DDB3, DDB4, DDB5, DDB6, DDB7, DDB8,..., DDBn) increases and the same data block is retransmitted. Since the cycle becomes longer, the waiting time until the content download is completed becomes longer. For example, this period is several tens of seconds to several minutes.

  With 1Seg, as described above, it is possible to view the video even while acquisition of data of data broadcasting fails and waiting for retransmission of the data. However, in 1Seg, in order to receive data broadcast data that failed to be acquired, it is necessary to continuously receive a transport stream transmitted from the same broadcast station, and the user can switch to the video of another broadcast station. difficult.

  The same applies to the case where a large-capacity data download service is performed in a dedicated segment. In order to receive a data block that has failed to be acquired, the digital broadcast receiving device transmits a transport transmitted from the same broadcasting station. The stream needs to be received continuously. When the transport stream is used exclusively for data download, since the transport stream does not include video data, the user cannot view the video.

  In some cases, a user makes a content storage reservation using a content storage service provided by a broadcasting station. When the user does not view video and audio and only needs data, the digital broadcast receiver does not need to reproduce the video data and audio data, and is transmitted from the broadcast station at the reserved time. Even if video data and audio data are included in the transport stream, it is not necessary to receive data blocks that have already been received in a predetermined cycle by the data carousel method. If a data block that has already been received is received, there is a problem that power consumption is wasted for the digital broadcast receiving apparatus.

  In view of the above problems, the present invention provides a digital broadcast receiving apparatus, a digital broadcast receiving method, a computer program for realizing the digital broadcast receiving method, and a digital broadcast for improving user convenience and power consumption of the digital broadcast receiving apparatus. An object of the present invention is to provide a computer-readable recording medium on which a computer program for realizing a receiving method is recorded.

In order to solve the above-mentioned problem, the first technical means of the present invention is to determine whether or not reception of the data block is completed in a digital broadcast receiving apparatus that receives the data block of data transmitted by the data carousel method. A storage unit for storing such information, and when the information stored in the storage unit indicates that there is a data block for which reception has not been completed, the timing for receiving the data block for which reception has not been completed is determined, on the basis of the timing, without performing the reception processing of the data blocks received is complete, and a control unit for selecting reception control to start the reception processing of the data blocks received is not completed, the user A viewing determination sensor that determines whether or not video viewing or audio listening is being performed, and the user determines whether or not a user is If it is determined not to perform the visual or audio listening, the control unit is obtained and characterized in that the selection reception control.

  According to a second technical means of the present invention, the first technical means further includes a data determining unit that determines whether or not the broadcast data includes video data or audio data, and the control unit includes the data determining unit The selective reception control is performed when it is determined by the unit that the broadcast data does not include video data or audio data.

According to a third technical means of the present invention, in the first or second technical means, a data block of data transmitted by the data carousel method is a data block of a transport stream, and the control unit When receiving the data block, the reception control is performed to receive a transport stream other than the transport stream corresponding to the data block for which reception has not been completed. .

According to a fourth technical means of the present invention, in a digital broadcast receiving method for receiving a data block of data transmitted by a data carousel method, a storage step for storing information regarding whether or not reception of the data block is completed; , When the information stored in the storage step indicates that there is a data block that has not been received, the timing for receiving the data block that has not been received is determined, and based on the timing A control step for performing selective reception control for starting reception processing of a data block for which reception has not been completed without performing reception processing for a data block for which reception has been completed, and for a user to view video or listen to audio A determination step of determining whether or not the image is being viewed by a viewing determination sensor. When The is determined not to perform visual or audio listening video, the control step may correspond to and performing the selection reception control.

A fifth technical means of the present invention is a computer program characterized by causing a computer to execute the digital broadcast receiving method.

According to a sixth technical means of the present invention, there is provided a computer-readable recording medium on which the computer program is recorded.

  According to the present invention, when a data block of data such as a transport stream is transmitted at a constant cycle by the data carousel method, the reception process of the data block is performed while the received data block is being transmitted. Since it becomes possible to receive data such as other transport streams, the convenience of the user can be improved. In addition, when data such as another transport stream is not received while the received data block is not being received, the power consumption of the digital broadcast receiving apparatus can be reduced.

It is a figure explaining the function of the digital broadcast receiver concerning this embodiment. It is a flowchart explaining the whole data reception process. 3 is a flowchart for explaining details of a data carousel selective reception process shown in FIG. 2. It is a figure which shows an example of the reception condition of TS packet. It is a figure which shows an example of the time storage table which a broadcast reception control part produces | generates. It is a figure which shows typically the data reception timing in a data carousel system. It is a figure explaining the structure method of the data block in a data carousel system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram for explaining functions of the digital broadcast receiving apparatus 10 according to the present embodiment. The digital broadcast receiver 10 receives content transmitted using a data carousel method by a transmitter installed in a broadcast station. For example, the digital broadcast receiving apparatus 10 receives multimedia broadcasting using a VHF (Very High Frequency) -Low band of an ISDB-Tsb (Integrated Services Digital Broadcasting-Terrestrial for Sound Broadcasting) system.

  As shown in FIG. 1, the digital broadcast receiving apparatus 10 includes a broadcast wave receiving antenna 11, a tuner 12, a multimedia decoder 13, a display control unit 14, an audio output control unit 15, a broadcast reception control unit 16, and a storage unit 17. Timer 18, key input unit 19, display unit 20, cellular phone communication antenna 21, wireless unit 22, communication function control unit 23, speech decoding unit 24, speech encoding unit 25, speaker 26, microphone 27, viewing determination unit 28.

  The broadcast receiving antenna 11 receives broadcast waves transmitted by an ISDB-Tsb (Integrated Services Digital Broadcasting-Terrestrial for Sound Broadcasting) system or the like. The tuner 12 demodulates a broadcast wave having a frequency at which a transport stream including data to be downloaded is transmitted, and outputs a demodulated TS (Transport Stream) packet to the multimedia decoder 13. . Here, the transport stream including the data to be downloaded is selected by the user, and the frequency at which the transport stream is transmitted is selected by the tuner 12 based on the NIT (Network Information Table) transmitted from the broadcasting station. Is done.

  The multimedia decoder 13 decodes the TS packet acquired from the tuner 12 and determines whether video data or audio data is included in the TS packet. If it is determined that the video data is included in the TS packet, the multimedia decoder 13 acquires the video data from the TS packet and outputs the acquired video data to the display control unit 14. When it is determined that the TS packet includes audio data, the multimedia decoder 13 acquires the audio data from the TS packet and outputs the acquired audio data to the audio output control unit 15.

  Further, the multimedia decoder 13 outputs a PAT (Program Association Table) included in the TS packet to the broadcast reception control unit 16. Furthermore, when the broadcast reception control unit 16 notifies the multimedia decoder 13 of a PID (Packet ID) of a PMT (Program Map Table) corresponding to the download service of the data to be downloaded, the TS corresponding to the PID. The PMT included in the packet is transmitted to the broadcast reception control unit 16.

  The display control unit 14 controls the display of the video data output from the multimedia decoder 13 by the display unit 20 under the control of the broadcast reception control unit 16. The audio output control unit 15 controls the audio output by the speaker 26 of the audio data output by the multimedia decoder 13 under the control of the broadcast reception control unit 16.

  The broadcast reception control unit 16 controls the entire broadcast reception process. For example, the broadcast reception control unit 16 performs processing for acquiring data to be downloaded from the received transport stream. Specifically, the broadcast reception control unit 16 receives the tuner 12 and the multimedia when the key input unit 19 receives a data download request from the user or when the download start time reserved in advance by the user is reached. The decoder 13 is activated. Then, the broadcast reception control unit 16 outputs a PAT included in the TS packet to the broadcast reception control unit 16 so as to output a PAT included in the TS packet in order to identify the TS packet of the transport stream including the data to be downloaded. An instruction is given to the media decoder 13.

  Thereafter, the broadcast reception control unit 16 analyzes the PAT output from the multimedia decoder 13 to identify the PID of the PMT corresponding to the data download service by the data carousel method. Then, the broadcast reception control unit 16 instructs the multimedia decoder 13 to transmit the PMT corresponding to the PID. The broadcast reception control unit 16 obtains a TS packet including data to be downloaded transmitted by the data carousel method using the PMT.

  Also, the broadcast reception control unit 16 successfully completes acquisition of the current time information, the reception time information when the data block was received, and the data block when acquisition of the data block of the data to be downloaded fails Based on the information indicating whether or not the data block has been received, the reception timing for receiving the data block for which normal acquisition has failed is calculated. Based on the reception timing, the broadcast reception control unit 16 performs selective reception control for starting reception of a data block that has failed to be acquired normally without performing reception processing of the data block that has already been received. A specific method for calculating the reception timing will be described in detail later.

  The storage unit 17 is a storage unit such as a memory or a hard disk device. The storage unit 17 is used by each functional unit such as the broadcast reception control unit 16 and stores various information such as time information and downloaded data. In particular, the storage unit 17 receives information on the data block name transmitted by the data carousel method, information on the reception time when the first and last TS packets of the data block are received, and whether or not the acquisition of the data block has been normally completed. Such information is stored. Such information will be described in detail later.

  The timer 18 measures time. The key input unit 19 receives a key input by the user. The display unit 20 is a display unit such as a liquid crystal display, and displays video and information provided to the user.

  The mobile phone communication antenna 21 transmits and receives radio waves for communication when the digital broadcast receiving apparatus 10 functions as a mobile phone having a telephone function and an electronic mail function. The wireless unit 22 modulates and demodulates communication radio waves when the digital broadcast receiver 10 functions as a mobile phone.

  The communication function control unit 23 controls a communication function of the mobile phone including a telephone function and an electronic mail function. For example, the communication function control unit 23 outputs the encoded audio signal demodulated by the radio unit 22 to the audio decoding unit 24, and outputs the audio signal encoded by the audio encoding unit 25 to the radio unit 22. Control such as.

  The audio decoding unit 24 decodes the encoded audio signal and outputs the audio signal to the speaker 26. The voice encoding unit 25 encodes a voice signal input from the microphone 27 during a call. The speaker 26 outputs an audio signal during a call. The speaker 26 performs a process of outputting the audio signal output from the multimedia decoder 13. The microphone 27 converts the user's voice into a voice signal during a call.

  The viewing determination unit 28 determines whether the user is viewing video and listening to audio. Specifically, the viewing determination unit 28 detects whether or not there is a person using a built-in human sensor, and when it is detected that there is a person, the user is viewing video or listening to audio. judge.

  In addition, the viewing determination unit 28 detects the movement of the digital broadcast receiving device 10 using a built-in acceleration sensor or the like, and when the digital broadcast receiving device 10 is stationary for a certain period of time, the user views the video or listens to the sound. It is good also as determining with having. Further, when the shape of the digital broadcast receiving apparatus 10 changes during visual viewing or audio listening, the viewing determination unit 28 detects the change, and the user is viewing the video or listening to the audio. It may be determined. For example, when the digital broadcast receiving apparatus 10 is foldable and the display surface of the display unit 20 is hidden when the body is folded, the user can detect the video by detecting that the body of the digital broadcast receiving apparatus 10 is not folded. It may be determined that the user is viewing or listening to audio.

  Next, reception processing of data transmitted by the data carousel method will be described. FIG. 2 is a flowchart illustrating the entire data reception process. As shown in FIG. 2, first, the tuner 12 of the digital broadcast receiving apparatus 10 starts receiving broadcast waves at a frequency at which the broadcast station transmits a transport stream including data to be downloaded (step S101). ). The transport stream including the data to be downloaded is selected by the user, and the frequency at which the transport stream is transmitted is selected by the tuner 12 based on the NIT transmitted from the broadcast station.

  The tuner 12 demodulates the broadcast wave and outputs the TS packet obtained as a result to the multimedia decoder 13 (step S102). Thereafter, the multimedia decoder 13 outputs the PAT included in the TS packet to the broadcast reception control unit 16, and the broadcast reception control unit 16 acquires the PAT (step S103).

  Thereafter, the broadcast reception control unit 16 analyzes the PAT and specifies the PID of the PMT corresponding to the download service for the data to be downloaded by the data carousel method (step S104). Then, the broadcast reception control unit 16 instructs the multimedia decoder 13 to transmit the PMT corresponding to the PID to the broadcast reception control unit 16. Upon receiving this instruction, the multimedia decoder 13 transmits a PMT corresponding to the PID to the broadcast reception control unit 16.

  The broadcast reception control unit 16 specifies the PID of the TS packet that transmits data to be downloaded using the PMT, and outputs the TS packet corresponding to the PID to the broadcast reception control unit 16 to the multimedia decoder 13. Instruct. Thereby, the broadcast reception control unit 16 performs filtering to extract TS packets including data to be downloaded from the TS packets (step S105).

  Subsequently, the broadcast reception control unit 16 checks whether or not video data or audio data is included in the TS packet including data to be downloaded (step S106). Whether video data or audio data is included in the TS packet can be detected by examining ES (Elementary Stream) type information included in the PMT. If video data or audio data is included in the TS packet of the data to be downloaded (YES in step S106), the viewing determination unit 28 determines whether the user views the video or listens to the audio. (Step S107).

  When it is determined that the user views the video or listens to the audio (YES in step S107), the broadcast reception control unit 16 receives the download target data transmitted by the data carousel method, and receives the received data. Is stored in the storage unit 17 (step S108). When the reception of the download target data is completed, the tuner 12 ends the broadcast wave reception process (step S109).

  When video data or audio data is not included in the TS packet including data to be downloaded (NO in step S106), or when it is determined that the user does not view video or listen to audio (step) In the case of NO in S107, the broadcast reception control unit 16 performs a selective reception process for the download target data transmitted by the data carousel method, and stores the received data in the storage unit 17 (step S110).

  In this selective reception process, the broadcast reception control unit 16 calculates a reception timing for receiving a data block that has failed in normal acquisition, and without performing reception processing of the data block that has already been normally acquired at the reception timing, Control is performed to start reception processing of data blocks that have failed to be acquired normally. This selective reception process will be described in detail with reference to FIG. When the reception of the download target data is completed, the tuner 12 ends the broadcast wave reception process (step S109).

  As described above, the broadcast reception control unit 16 determines whether or not video data or audio data is included in the broadcast data, and is selectively received when it is determined that the video data or audio data is not included in the broadcast data. Since the control is performed, the power consumption of the digital broadcast receiving apparatus 10 can be reduced by not performing the reception process of the data block that has already been normally acquired.

  In addition, when the viewing determination unit 28 determines whether the user is viewing video or listening to audio and determines that the user is not viewing video or listening to audio, broadcast reception control is performed. Since the unit 16 performs the selective reception control, the power consumption of the digital broadcast receiving apparatus 10 can be reduced by not performing the reception process of the data block that has already been normally acquired.

  Next, the data carousel selective reception process shown in FIG. 2 will be described. FIG. 3 is a flowchart for explaining details of the data carousel selection reception process shown in FIG. As shown in FIG. 3, first, the broadcast reception control unit 16 of the digital broadcast receiving apparatus 10 receives a TS packet including download target data transmitted by the data carousel method from the multimedia decoder 13 (step S201).

  Then, the broadcast reception control unit 16 determines whether there is a reception error when receiving the TS packet (step S202). If there is a reception error (YES in step S202), the broadcast reception control unit 16 receives the next TS packet (step S201). The broadcast reception control unit 16 can determine whether or not there is a reception error by examining an error flag in the header portion of the TS packet. When there is no reception error (NO in step S202), the broadcast reception control unit 16 determines whether or not the received TS packet is the first TS packet including the head portion of the data block of the data to be downloaded. (Step S203).

  When the TS packet is the first TS packet including the head portion of the data block (in the case of YES in step S203), the broadcast reception control unit 16 acquires information on the reception time of the TS packet from the timer 18 and acquires it. The time is stored in the storage unit 17 (step S204). When the TS packet is not the first TS packet including the head portion of the data block (NO in step S203), or when the information of the reception time of the first TS packet is stored in the storage unit 17 (step S204) The reception control unit 16 checks whether the acquisition of the data block has been normally completed without causing a reception error in the TS packet (step S205).

  If the acquisition of the data block has not been completed normally (NO in step S205), the broadcast reception control unit 16 re-received data that has been received in the past by the data block that could not be acquired normally. It is determined whether it is a block (step S208). If the data block is not a re-received data block (NO in step S208), the broadcast reception control unit 16 receives the next TS packet (step S201). If the data block is a re-received data block (YES in step S208), broadcast reception control unit 16 further determines whether or not to continue receiving subsequent data blocks (step S209).

  If acquisition of the data block has been completed normally (YES in step S205), the broadcast reception control unit 16 acquires information on the reception time of the last TS packet of the data block from the timer 18, and stores the acquired time. Store in the unit 17 (step S206).

  Thereafter, the broadcast reception control unit 16 determines whether or not the downloading of all data blocks of the data to be downloaded has been completed normally without causing a reception error in the TS packet (step S207). If downloading of all data blocks has been completed normally (YES in step S207), the data carousel selection reception process ends. If downloading of all data blocks has not been completed normally (NO in step S207), broadcast reception control unit 16 determines that the data block has been successfully acquired (data block corresponding to YES in step S205). Is a re-received data block that has been received in the past (step S208).

  When the data block whose normal acquisition has been completed is not the re-received data block (NO in step S208), the broadcast reception control unit 16 receives the next TS packet (step S201). If the data block whose normal acquisition has been completed is a re-received data block (YES in step S208), the broadcast reception control unit 16 determines that the transmission of the data block has been completed, and receives the subsequent data block. Is further determined whether or not to continue (step S209). In addition, the broadcast reception control unit 16 determines that the data block whose acquisition has not been completed normally (the data block corresponding to the case of NO in step S205) is a re-received data block that has been received in the past. Also in the case of YES in step S208, processing for determining whether or not to continue receiving subsequent data blocks is performed (step S209).

  Specifically, the broadcast reception control unit 16 receives the current time, the reception time of the first TS packet including the data constituting the head portion of the data block, and the last including the data constituting the last portion of the data block. The time for resuming reception is calculated using the reception time of the TS packet and information indicating whether or not the acquisition of the data block has been normally completed. If the current time has not reached the time at which reception is resumed, the broadcast reception control unit 16 determines that continuous data block reception is not performed. When the current time has reached the time to resume reception, the broadcast reception control unit 16 determines that continuous reception of the data block is to be performed. The calculation of the time for restarting reception will be described in detail later with reference to FIGS.

  If it is determined that continuous reception of the data block is performed (YES in step S209), the broadcast reception control unit 16 determines whether or not a transport stream including data to be downloaded is currently received. (Step S210). If a transport stream including data to be downloaded is received (YES in step S210), reception of TS packets is continued as it is (step S201).

  When a transport stream including data to be downloaded has not been received (NO in step S210), the broadcast reception control unit 16 transmits a transport stream including data to be downloaded to the tuner 12. An instruction is given to demodulate a broadcast wave of a certain frequency, and switching to reception of the transport stream is performed (step S211). Thereafter, the broadcast reception control unit 16 continues to receive TS packets (step S201).

  When it is determined that the reception of data blocks after the data block whose acquisition has been completed is not continued (NO in step S209), the broadcast reception control unit 16 interrupts the TS packet reception process ( Step S212). Then, the broadcast reception control unit 16 determines whether or not a request to switch reception of a transport stream including data to be downloaded to reception of another transport stream has been received from the user (step S213). When receiving a request to switch to reception of another transport stream from the user, the broadcast reception control unit 16 determines that the current time has reached the reception restart time of the transport stream including the data to be downloaded. Then, a notification that the reception target is switched to the reception of the transport stream is output to the display unit 20 to notify the user to that effect.

  When a request to switch to another transport stream is received from the user (YES in step S213), the broadcast reception control unit 16 transmits the frequency at which the other transport stream received from the user is transmitted to the tuner 12. The broadcast wave is instructed to be demodulated and switched to reception of the transport stream (step S214).

  As described above, when the broadcast reception control unit 16 receives a request from the user to switch the transport stream to another transport stream while the reception process of the transport stream including the data to be downloaded is interrupted, Because the reception control to switch to the transport stream is performed, if the period of retransmitting the data block by the data carousel method is long and the reception interruption period of the transport stream including the data to be downloaded is long, the user is different. It is possible to view the video and audio transmitted by the transport stream of the user, and the convenience for the user can be improved.

  Further, it is also possible to download data by applying the selective reception process of the present invention to other switched transport streams. As a result, it is possible to simultaneously download data while improving user convenience and saving power in the digital broadcast receiving apparatus 10 in a plurality of transport streams.

  When switching to reception of another transport stream (step S214), or when a request to switch to another transport stream is not received from the user (NO in step S213), the broadcast reception control unit 16 It is determined whether or not the TS packet reception restart time has been reached (step S215). The reception restart time will be described in detail later with reference to FIGS.

  When the TS packet reception resumption time has not been reached (NO in step S215), the broadcast reception control unit 16 repeats the process of determining whether a request to switch to reception of another transport stream has been received from the user. (Step S213). When the TS packet reception restart time is reached (YES in step S215), the broadcast reception control unit 16 determines whether or not a transport stream including data to be downloaded is currently received (step S210). The subsequent processing is continued.

  Here, a method for calculating the time for restarting reception of the transport stream will be described with an example. FIG. 4 is a diagram illustrating an example of reception status of TS packets. FIG. 4 shows a carousel data transmission cycle, TS packet number, TS packet reception time, presence / absence of reception error, data block name, and processing performed at the time of packet reception. Here, the notation of time “aa: bb: c” represents a time of aa minutes bb seconds c.

  FIG. 5 is a diagram illustrating an example of the time storage table 30 generated by the broadcast reception control unit 16. The time storage table 30 shown in FIG. 5 includes information on the data block name, the reception time of the first TS packet of the data block, the reception time of the last TS packet of the data block, and the acquisition status of the data block. The time storage table 30 is stored in the storage unit 17 of the digital broadcast receiving device 10.

  As shown in FIG. 4 and FIG. 5, for the data block DII in the first order of the carousel data transmission cycle, the first TS packet is received by the digital broadcast receiving apparatus 10 at time “02: 00: 0”, and the last The TS packet is received at time “02: 00: 4”, each TS packet including the data constituting the data block DII has no reception error, and the acquisition of the data block DII is normally completed. Similarly, the acquisition of data blocks is completed normally for the data blocks DDB1 and DDB2.

  On the other hand, for the data block DDB0, since the first TS packet can be received without any reception error, the reception time “02: 00: 5” is stored in the time storage table 30 (in step S204 of FIG. 3). Corresponding to processing). However, since a reception error has occurred in the second to fourth TS packets (TS packets corresponding to Nos. 7 to 9 in FIG. 4), the reception time of the last TS packet is not stored (in FIG. 3). Since it is NO in step S205, the process of step S206 is not executed), and the data block acquisition state is also not acquired.

  For the data block DDB3, since a reception error has occurred from the first TS packet to the third TS packet received (TS packet corresponding to No. 27 to 29 in FIG. 4), the reception time of the first TS packet, the last The reception time of the TS packet is not stored (NO in step S203 of FIG. 3, so the process of step S204 is not executed, and because of NO in step S205, the process of step S206 is executed). The acquisition status of the data block has not been acquired.

  When there are unacquired data blocks DDB0 and DDB3, the broadcast reception control unit 16 retransmits the unacquired data blocks DDB0 and DDB3 by the data carousel method (No. 39 to 45 in FIG. (Corresponding to Nos. 60 to 66, Nos. 72 to 78), the TS packet is received, and the time blocks (Nos. 46 to 59, Nos. 67 to 71 in FIG. 4) in which the already acquired data blocks DDB1 and DDB2 are retransmitted. ) Performs processing for interrupting reception of TS packets.

The broadcast reception control unit 16 calculates the reception resume time Tr using, for example, the following equation. That is, the broadcast reception control unit 16 includes a data block (DII, DDDBi (i = 0 to n)) received immediately before and a data block (DDBi) that has not been successfully acquired as a calculation target of the reception restart time Tr. If there is a data block DII between
(Formula 1) Tr = Tp + (Td_DII + Ti) + (Td_DDB + Ti) × n_DDB + Tc−Ts
To calculate the reception restart time Tr. In addition, the broadcast reception control unit 16 includes the data block (DII, DDBi (i is 0 to n)) received immediately before and the data block (DDBi) for which the normal acquisition that is the calculation target of the reception restart time Tr is not completed If there is no data block DII between
(Formula 2) Tr = Tp + (Td_DDB + Ti) × n_DDB−Ts
To calculate the reception restart time Tr.

  Where Tp is the current time, Td_DII is the difference between the reception time of the last TS packet of data block DII and the reception time of the first TS packet of data block DII, and Td_DDB is the data block DDBi (i = 0 to n) The difference between the reception time of the last TS packet and the reception time of the first TS packet of the data block DDBi, Ti is the TS packet reception interval (however, the last carousel data transmission cycle is in j order (j = 1 to m)) N_DDB has not completed normal acquisition for the calculation of the data block received immediately before and the reception resumption time Tr). The number of data blocks DDBi between the data blocks, Tc, is the first TS packet in the (j + 1) th order after the completion of reception of the last TS packet in the jth order in the carousel data transmission cycle. Ts is an interval until the reception of a receiver starts, and Ts is a time required for the functional units such as the tuner 12 and the multimedia decoder 13 that are in an inactive state during reception interruption to be in an active state.

  The Tp and Ti information is obtained from the timer 18, the Td_DII, Td_DDB, and n_DDB information is obtained from the time storage table 30 stored in the storage unit 17, and the Tc information is the last TS packet in the j-th order. It is obtained from the reception time, the reception time of the first TS packet in the (j + 1) order, and the information of the TS packet reception interval Ti.

  For example, consider the case where the reception of the last TS packet (the TS packet corresponding to No. 38 in FIG. 4) constituting the second-order data block DII in FIG. In the first order, reception errors occur in the data blocks DDB0 and DDB3, and acquisition of these data blocks is not completed normally. Therefore, TS packets are received at a timing at which TS packets including data constituting data blocks DDB0 and DDB3 are retransmitted by the broadcasting station, and reception of TS packets is performed while other TS packets are retransmitted. Try to interrupt.

  In this case, the broadcast reception control unit 16 obtains the data block DII at the time of receiving the last TS packet (TS packet corresponding to No. 38 in FIG. 4) including the data constituting the second-order data block DII. Thus, it is determined that the data block DII that has already been received in the first order is received again (in the case of YES in step S208 in FIG. 3), so whether or not the subsequent data block is continuously received. Further processing for determining whether or not is performed (step S209 in FIG. 3).

  This determination is performed by calculating the reception restart time Tr, but data between the data block DII that has been acquired immediately before and the data block DDB0 for which the normal acquisition that is the calculation target of the reception restart time Tr has not been completed. Since there is no block DII, the broadcast reception control unit 16 calculates the reception restart time Tr using Equation (2).

  In this case, Tp is “02: 04: 4” (124.4 seconds), Td_DDB is the reception time “02: 02: 5” of the last TS packet of the first data block DDB2, and the reception of the first TS packet. The difference from the time “02: 01: 9” is 0.6 seconds (see FIG. 5. Note that the reception time and the first TS of the last TS packet of another data block that is normally acquired, for example, the data block DDB1 The difference from the reception time of the packet may be used.), Ti is 0.1 second, n_DDB is the data block DII that has just been acquired, and the data block DDB0 for which the reception restart time Tr is to be calculated 0 because there is no data block. Here, Ts is 0.

Substituting these into equation (2) gives
Tr = 124.4 + (0.6 + 0.1) x 0-0 = 124.4 (seconds) (time "02: 04: 4")
It becomes. Since the current time is “02: 04: 4”, which coincides with the reception restart time “02: 04: 4”, the broadcast reception control unit 16 continues to receive the subsequent data block DDB0.

  Similarly, the broadcast reception control unit 16 calculates the reception restart time Tr of the TS packet of the data block DDB3 for which normal acquisition has not been completed, using Expression (2). In this case, Tp is “02: 04: 4” (124.4 seconds), Td_DDB is the reception time “02: 02: 5” of the last TS packet of the first data block DDB2, and the reception of the first TS packet. The difference from the time “02: 01: 9” is 0.6 seconds (see FIG. 5). The reception time of the last TS packet and the reception time of the first TS packet of another data block that is normally acquired 3), Ti is 0.1 seconds, n_DDB is 3 data blocks between the data block DII that has just been acquired and the data block DDB3 that is the target of calculating the reception restart time Tr. 3 (data blocks DDB0, DDB1, DDB2). Here, Ts is 0.

Substituting these into equation (2) gives
Tr = 124.4 + (0.6 + 0.1) x 3-0 = 126.5 (seconds) (time "02: 06: 5")
It becomes. Since the current time is “02: 04: 4” and has not reached this reception resumption time “02: 06: 5”, the broadcast reception control unit 16 does not receive the TS packet at the current time “02: 04: 4”. The reception is interrupted and the reception is resumed at time “02: 06: 5”. Here, when calculating the reception start time Tr of the data block DDB0, the broadcast reception control unit 16 determines that the subsequent data block DDB0 is continuously received at the current time “02: 04: 4”. This is different from the above-described determination that the reception of the TS packet is interrupted at the current time “02: 04: 4”. In this case, the broadcast reception control unit 16 gives priority to the determination that the data block is received.

  In the example of FIG. 4, even in the second order, a reception error occurs in the TS packet of the data block DDB0 (TS packet corresponding to No. 43 of FIG. 4), and the acquisition of the data block DDB0 is not normally completed. In this case, the broadcast reception control unit 16 does not receive a TS packet that includes data that constitutes another data block DDB3 that has not been normally acquired, and the TS packet that includes data that constitutes the data block DDB0 in the third order. The reception of TS packets is interrupted until the time when is retransmitted.

  Specifically, when the broadcast reception control unit 16 receives the last TS packet of the data block DDB0 (TS packet corresponding to No. 45 in FIG. 4) in the second order, the data block DDB0 is normally acquired. Since it is not completed (in the case of NO in step S205 in FIG. 3), the data block DDB0 is a re-received data block that has been received in the first order (in the case of YES in step S208 in FIG. 3). Processing for determining whether or not to continue receiving data blocks is further performed (step S209 in FIG. 3).

  At this time, the broadcast reception control unit 16 calculates the TS resumption time Tr of the TS block of the data block DDB0 in order to receive the TS packet of the data block DDB0 that has not yet been successfully acquired. In this case, since there is a data block DII between the data block DDB0 received immediately before and the third-order data block DDB0 for which the reception resumption time Tr is calculated, the broadcast reception control unit 16 sets the equation (1) to To calculate the reception restart time Tr.

  Here, Tp is “02: 05: 1” (125.1 seconds), Td_DII is the reception time “02: 04: 4” of the last TS packet of the second data block DII, and the reception of the first TS packet. The difference from the time “02: 04: 0” is 0.4 seconds (the difference between the reception time of the last TS packet of the acquired data block DII and the reception time of the first TS packet in another carousel data transmission cycle is stored. It is also possible to use it.), Ti is 0.1 second, Td_DDB is the reception time “02: 02: 5” of the last TS packet of the first data block DDB2, and the first TS packet The difference from the reception time “02: 01: 9” of 0.6 seconds (the reception time of the last TS packet and the reception time of the first TS packet of another data block acquired normally, for example, the data block DDB1 It is also possible to use the difference of n_DDB in the second order received immediately before Since there are three data blocks (data blocks DDB1, DDB2, and DDB3) between the data block DDB0 and the third data block DDB0 for which the reception resume time Tr is to be calculated, 3, Tc is the last in the first order. This is an interval from the completion of the reception of the TS packet to the start of the reception of the first TS packet in the second order. That is, Tc is calculated from the difference between the reception time “02: 04: 0” of the first TS packet in the second order and the reception time “02: 03: 2” of the last TS packet in the first order. It is 0.7 seconds by subtracting 0.1 seconds, which is the packet reception interval. Here, Ts is 0.

Substituting these into equation (1) gives
Tr = 125.1 + (0.4 + 0.1) + (0.6 + 0.1) x 3 + 0.7-0 = 128.4 (seconds) (time "02: 08: 4")
It becomes. Since the current time is “02: 05: 1” and has not reached the reception resumption time “02: 08: 4”, the broadcast reception control unit 16 does not receive the TS packet at the current time “02: 05: 1”. Reception is suspended and reception is resumed at time “02: 08: 4”. During this time, the broadcast reception control unit 16 performs reception processing for the TS packet based on the reception restart time Tr calculated for reception of the TS packet including data constituting the data block DDB3.

  Although the calculation method of the reception restart time Tr has been described above, the calculation method is not limited to that described above, and other methods may be used. For example, when it is possible to obtain in advance separately information on the timing at which TS packets including data constituting the data blocks DII and DDBi (i = 1 to n) are transmitted, the data block already received based on the information May not receive the TS packet, but may receive the TS packet at the timing when the TS packet is transmitted for the data block that has failed to be acquired.

  Although the description has so far been made centering on the embodiments of the digital broadcast receiving apparatus and the digital broadcast receiving method, the present invention is not limited to these embodiments, and in order to realize the functions of the digital broadcast receiving apparatus. The present invention may be implemented as a form of a computer program or a form of a computer-readable recording medium on which the computer program is recorded.

  Here, as a recording medium, a disk system (for example, magnetic disk, optical disk, etc.), a card system (for example, memory card, optical card, etc.), a semiconductor memory system (for example, ROM, nonvolatile memory, etc.), a tape system (for example) For example, the recording medium may be in any form such as a magnetic tape or a cassette tape.

  By recording and distributing a computer program for realizing the functions of the above-described digital broadcast receiving apparatus of the present invention or a computer program for causing a computer to execute the digital broadcast receiving method on these recording media, the cost can be reduced. And portability and versatility can be improved.

  Then, the above recording medium is mounted on the computer, the computer program recorded on the recording medium is read out by the computer and stored in the memory, and the processor (CPU, Central Processing Unit) included in the computer reads out the computer program from the memory and executes it Thus, the function of the digital broadcast receiving apparatus according to the present invention can be realized and the digital broadcast receiving method can be executed.

DESCRIPTION OF SYMBOLS 10 ... Digital broadcast receiver, 11 ... Broadcast wave receiving antenna, 12 ... Tuner, 13 ... Multimedia decoder, 14 ... Display control part, 15 ... Audio | voice output control part, 16 ... Broadcast reception control part, 17 ... Memory | storage part, DESCRIPTION OF SYMBOLS 18 ... Timer, 19 ... Key input part, 20 ... Display part, 21 ... Antenna for mobile telephone communication, 22 ... Radio | wireless part, 23 ... Communication function control part, 24 ... Speech decoding part, 25 ... Speech coding part, 26 ... Speaker, 27 ... microphone, 28 ... viewing determination unit, 30 ... time storage table.

Claims (6)

In a digital broadcast receiver that receives data blocks of data transmitted by the data carousel method,
A storage unit for storing information regarding whether or not reception of the data block is completed;
When the information stored in the storage unit indicates that there is a data block for which reception has not been completed, the timing for receiving the data block for which reception has not been completed is determined, and based on the timing, A control unit that performs selective reception control to start reception processing of a data block that has not been received without performing reception processing of the data block that has been received; and
A viewing determination sensor for determining whether the user is viewing video or listening to audio;
With
The digital broadcast receiving apparatus according to claim 1, wherein the control unit performs the selective reception control when it is determined by the viewing determination sensor that the user is not viewing video or listening to audio .   A data determination unit that determines whether or not video data or audio data is included in the broadcast data, and the control unit is configured so that the data determination unit does not include video data or audio data in the broadcast data. 2. The digital broadcast receiving apparatus according to claim 1, wherein the selective reception control is performed when the determination is made. A data block of data transmitted by the data carousel method is a data block of a transport stream, and when the control unit determines that a certain time point is not a timing for receiving the data block, reception is completed. 3. The digital broadcast receiving apparatus according to claim 1, wherein reception control is performed to receive a transport stream other than a transport stream corresponding to a data block that has not been received. In a digital broadcast receiving method for receiving a data block of data transmitted by a data carousel method,
A storage step of storing information relating to whether reception of the data block is completed;
When the information stored in the storing step indicates that there is a data block for which reception has not been completed, the timing for receiving the data block for which reception has not been completed is determined, and based on the timing, A control step for performing selective reception control for starting reception processing for a data block for which reception has not been completed without performing reception processing for a data block for which reception has been completed;
A determination step of determining by a viewing determination sensor whether the user is viewing a video or listening to audio;
Including
The digital broadcast receiving method according to claim 1, wherein the control step performs the selective reception control when it is determined in the determination step that the user is not viewing video or listening to audio . A computer program for causing a computer to execute the digital broadcast receiving method according to claim 4 . A computer-readable recording medium having recorded thereon the computer program according to claim 5 .

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