JP2016178545A - Broadcast receiver and output control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide "a broadcast receiver and an output control method" capable of shortening the delay processing time and avoiding the lack of output data, when the broadcast of the second standard is switched while performing the delay processing of output data of the first standard.SOLUTION: When the voice data of IP broadcast is switched to the voice data of other IP broadcast transmitted via other route, while performing the delay processing of the voice data of DAB broadcast, a delay processing section 108 continues the delay processing until the output timing of the voice data of DAB broadcast is synchronized with that of the voice data of other IP broadcast. Consequently, the delay processing that was performed before the voice data of IP broadcast is switched is not interrupted, and the output timing of the voice data of DAB broadcast is synchronized with that of the voice data of other IP broadcast.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a broadcast receiving apparatus and an output control method, and in particular, broadcast reception adapted to selectively switch between a first standard broadcast and a second standard broadcast delayed from the first standard broadcast. It is suitable for use in an apparatus and an output control method.

  Conventionally, two broadcasts (for example, DAB (Digital Audio Broadcast) broadcast and IP (Internet Protocol) broadcast) having the same contents but different standards can be received, and these two broadcasts can be selectively switched and output. A broadcast receiving apparatus made in the above has been devised. Thereby, for example, when the reception environment of one broadcast is deteriorated, the user can continue to listen to the same broadcast by switching to the other broadcast and outputting.

  However, there may be a time difference between two broadcasts received by the broadcast receiving apparatus. For example, in a broadcast receiving apparatus that can selectively switch between DAB broadcast and IP broadcast, the IP broadcast is transmitted from the broadcast station to the broadcast receiving apparatus via a provider, an Internet server, or the like. For this reason, it is known that there is a time difference between DAB broadcast and IP broadcast received by the broadcast receiving apparatus, that is, reception of IP broadcast is delayed from reception of DAB broadcast.

  Therefore, conventionally, a technology has been devised that enables seamless switching between two broadcasts by eliminating the time difference between the two broadcasts and synchronizing the output timings of the two broadcasts. ing.

  For example, in Patent Document 1 below, in a duplex configuration IP broadcast transmission system including a 1-system IP transmission server and a 2-system IP transmission server, the 1-system and 2-system are regularly transmitted to TS (Transport Stream). A time stamp is added to the TS signal, and a difference value between a PCR (Program Clock Reference) code included in the TS and the time stamp is detected, and the TS signal is generated based on the difference value detected in each of the first and second systems. On the other hand, a technique for performing synchronization processing is disclosed. Thereby, since IP packets are synchronously input from the 1-system IP transmission server and the 2-system IP transmission server to the switch, it is possible to switch the video smoothly.

JP 2008-227599 A

  Here, in a conventional broadcast receiving apparatus capable of selectively switching between DAB broadcast and IP broadcast, the delay time of the IP broadcast with respect to the DAB broadcast is obtained, and the audio data of the DAB broadcast is determined according to the delay time. A method is used in which the output timing of DAB broadcast audio data is synchronized with the output timing of IP broadcast audio data by performing a delay process (time stretch) on.

  In general, IP broadcasting is broadcast from a broadcasting station via a provider and an Internet server. A plurality of providers are provided between the broadcast station and the server. The Internet server can select a provider that can output an IP broadcast with better sound quality from among a plurality of providers, and can send the IP broadcast supplied from the selected provider to the broadcast receiving apparatus. It is like that.

  For this reason, in the conventional broadcast receiving apparatus, in order to synchronize the output timing of the IP broadcast and the output timing of the DAB broadcast, when the delay processing of the DAB broadcast is performed, the IP broadcast supplied from the Internet server May be switched to IP broadcasts of other providers. In this case, the conventional broadcast receiving apparatus stops the delay processing of the DAB broadcast that has been performed so far, and synchronizes the output timing of the DAB broadcast with the output timing of the IP broadcast after switching, so that the delay of the DAB broadcast is performed. The process was redone from the beginning. This is because the IP broadcast reception timing in the broadcast receiving apparatus also changes when the provider through which the service is routed is switched.

  FIG. 7 is a diagram illustrating an example of processing timing by a conventional broadcast receiving apparatus. Here, IP broadcast includes IP broadcast A and IP broadcast B. An example will be described in which audio data having the same content is broadcast as “1”, “2”, “3”, “4”,... In both DAB broadcasting and IP broadcasting A and B. Here, one frame of audio data is schematically shown on the assumption that it is audio data of a predetermined time (for example, 1 second).

  As shown in FIG. 7, the audio data of DAB broadcast and the audio data of IP broadcasts A and B have the same contents, but IP broadcasts A and B are broadcast from a broadcast station via a provider, an Internet server, etc. Since it is transmitted to the receiving device, it is received with a delay from the DAB broadcast. In the example shown in FIG. 7, IP broadcast A is delayed by two frames of audio data from DAB broadcast. Also, IP broadcast B is received with a delay from IP broadcast A because the provider through which it differs is different from IP broadcast A. In the example shown in FIG. 7, IP broadcast B is delayed by three frames of audio data from IP broadcast A.

  In the example shown in FIG. 7, first, the DAB broadcast audio data is output by performing the first delay process of the DAB broadcast so that the switching from the audio output of the DAB broadcast to the audio output of the IP broadcast A is seamless. The output timing is synchronized with the output timing of the audio data of IP broadcast A. Thereafter, since the IP broadcast A is switched to the IP broadcast B, the DAB broadcast audio data output timing is synchronized with the IP broadcast B audio data output timing by restarting the second delay process of the DAB broadcast from the beginning. I try to let them.

  Specifically, first, when the power is switched on (timing t1), the broadcast receiving apparatus starts receiving DAB broadcast and IP broadcast A audio data, and receives the received DAB broadcast and IP broadcast A audio data. Are sequentially stored in the buffer. The broadcast receiving apparatus calculates the delay time of the IP broadcast A from the DAB broadcast by comparing the DAB broadcast audio data stored in the buffer with the IP broadcast A audio data. Then, when the delay time of the IP broadcast A from the DAB broadcast is calculated (timing t2), the broadcast receiving device starts the first delay process of the output sound of the DAB broadcast according to the calculated delay time. .

  When the first delay process of the DAB broadcast is performed and the IP broadcast A is switched to the IP broadcast B (timing t3), the broadcast receiving apparatus performs the first DAB broadcast that has been performed so far. The delay process is immediately stopped (first example in FIG. 7). Alternatively, when the broadcast receiving apparatus finishes calculating the delay time of the IP broadcast B from the DAB broadcast, it stops the first delay process of the DAB broadcast that has been performed so far (second example in FIG. 7). .

  Then, when the delay time of the IP broadcast B from the DAB broadcast is calculated (timing t4 in FIG. 7), the broadcast receiving device performs the second delay processing of the output sound of the DAB broadcast according to the calculated delay time. To start. By this second delay processing, the broadcast receiving apparatus eliminates the delay time of the IP broadcast B from the DAB broadcast, and the output timing of the DAB broadcast and the output timing of the IP broadcast B are synchronized (after timing t5) Status), seamless switching from DAB broadcasting to IP broadcasting B can be performed.

  As described above, when the IP broadcast is switched during the delay process of the DAB broadcast, the conventional broadcast receiving apparatus needs to restart the delay process of the DAB broadcast from the beginning. Therefore, there has been a problem that the synchronization timing between the DAB broadcast and the IP broadcast cannot be advanced. For this reason, for example, immediately after switching on the power of the broadcast receiving apparatus, when the necessity for switching to IP broadcasting occurs due to the deterioration of the DAB broadcasting reception environment, it is difficult to switch to IP broadcasting. Inevitably, the user had to keep listening to the DAB broadcast output sound.

  Further, when the conventional broadcast receiving apparatus stops the delay processing of DAB broadcasting, the latest sound data at that time is output thereafter, and thus there is a problem that sound data is lost. For this reason, the conventional broadcast receiving apparatus cannot keep the DAB broadcast output audio seamlessly heard by the user until the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast.

  For example, in the first example shown in FIG. 7, the delay process is stopped when the IP broadcast B is switched (when the audio data “5” is output (timing t3)), and thereafter, The audio data after the audio data “7” is output. That is, in the first example, the audio data “6” is missing. On the other hand, in the second example shown in FIG. 7, when switching to IP broadcast B, the delay time is not stopped and the delay time has been calculated (when audio data “7” is output (timing t4)). After that, the delay processing is stopped, and thereafter, the audio data after the audio data “11”, which is the latest data at that time, is output. That is, in the second example, the audio data “8” to “10” are missing.

  The present invention has been made to solve such problems, and delay of output data of the first standard for synchronizing the output timing of the broadcast of the first standard with the output timing of the broadcast of the second standard. While performing the processing, it is possible to reduce the delay processing time of the first standard broadcast when the second standard broadcast is switched to another second standard broadcast. It is an object of the present invention to be able to avoid the lack of standard broadcast output data.

  In order to solve the above-described problems, in the present invention, delay processing of broadcast data of the first standard is performed in order to synchronize the output timing of the broadcast data of the first standard with the output timing of the broadcast data of the second standard. Sometimes, when the received broadcast data of the second standard is switched to other second standard broadcast data transmitted via another route, the output timing of the broadcast data of the first standard is other than The delay process is continued until it is synchronized with the output timing of the broadcast data of the second standard.

  According to the present invention configured as described above, when the delay processing of the broadcast data of the first standard is performed, when the broadcast data of the second standard is switched to the broadcast data of the other second standard, until then The delay process that has been performed in the above is continuously performed without interruption, and the output timing of the broadcast data of the first standard is synchronized with the output timing of the broadcast data of the other second standard by the delay process. . For this reason, the delay processing time of the first standard broadcast can be shortened, and the lack of output data of the first standard broadcast can be avoided.

It is a block diagram which shows the function structural example of the broadcast receiver which concerns on 1st Embodiment of this invention. It is a flowchart which shows an example of the process by the broadcast receiver which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the process timing by the broadcast receiver which concerns on 1st Embodiment of this invention. It is a block diagram which shows the function structural example of the broadcast receiver which concerns on 2nd Embodiment of this invention. It is a flowchart which shows an example of the process by the broadcast receiver which concerns on 2nd Embodiment of this invention. It is a figure which shows an example of the process timing by the broadcast receiver which concerns on 2nd Embodiment of this invention. It is a figure which shows an example of the process timing by the conventional broadcast receiving apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a functional configuration example of a broadcast receiving apparatus 10 according to the first embodiment of the present invention. The broadcast receiving apparatus 10 shown in FIG. 1 receives DAB broadcast (an example of a first standard broadcast) and an IP broadcast (an example of a second standard broadcast), and receives DAB broadcast audio data (first standard broadcast). This is an apparatus that can selectively switch between an example of broadcast data) and audio data of IP broadcast (an example of broadcast data of the second standard) and output to the speaker 12.

  As shown in FIG. 1, the broadcast receiving apparatus 10 includes a first receiving unit 101, a first demodulating unit 102, a DAB buffer 103, a second receiving unit 104, a second demodulating unit 105, an IP buffer 106, and a delay time calculating unit 107. The delay processing unit 108 and the output control unit 109 are provided.

  Each of the functional blocks 101 to 109 can be configured by any of hardware, DSP (Digital Signal Processor), and software. For example, when configured by software, each of the functional blocks 101 to 109 is actually configured by including a CPU, RAM, ROM, etc. of a computer, and stored in a recording medium such as RAM, ROM, hard disk, or semiconductor memory. Is realized by operating.

  The first receiver 101 receives a DAB broadcast wave. The first demodulator 102 demodulates the digital audio signal included in the DAB broadcast wave received by the first receiver 101. The DAB buffer 103 stores audio data included in the DAB broadcast (DAB broadcast demodulated by the first demodulator 102) received by the first receiver 101.

  The second receiver 104 receives IP broadcast communication data. The second demodulator 105 demodulates the digital audio signal contained in the IP broadcast communication data received by the second receiver 104. The IP buffer 106 stores audio data included in the IP broadcast received by the second receiver 104 (the IP broadcast demodulated by the second demodulator 105).

  The IP broadcast received by the second receiver 104 has the same content as the DAB broadcast received by the first receiver 101. However, the IP broadcast received by the second receiving unit 104 is received with a delay from the DAB broadcast received by the first receiving unit 101. Whereas the first receiving unit 101 directly receives a broadcast wave of DAB broadcasting, the second receiving unit 104 receives the IP transmitted from the broadcasting stations 40a and 40b via the providers 30A to 30E and the Internet server 20. This is because broadcast communication data is received. The broadcast receiving apparatus 10 receives the IP broadcast of any of the providers 30A to 30E selected by the Internet server 20. When the IP broadcast received by the second receiving unit 104 is switched, the second receiving unit 104 notifies the delay time calculating unit 107 to that effect.

  The output control unit 109 receives the digital audio signal of the DAB broadcast (DAB broadcast demodulated by the first demodulator 102) received by the first receiver 101 and the IP broadcast (second signal received by the second receiver 104). The digital audio signal of the IP broadcast after demodulation by the demodulation unit 105 is selectively switched and output. For example, when the received signal strength of DAB broadcasting is higher than a predetermined threshold, the output control unit 109 switches to DAB broadcasting and outputs it. On the other hand, when the received signal strength of DAB broadcasting falls below a predetermined threshold, the output control unit 109 switches to IP broadcasting and outputs it. That is, the output control unit 109 preferentially outputs a DAB broadcast having a higher quality than the IP broadcast. The audio signal output from the output control unit 109 is amplified by the amplifier 11 and output from the speaker 12 as audio.

  The delay time calculation unit 107 calculates the delay time of the IP broadcast received by the second reception unit 104 from the DAB broadcast received by the first reception unit 101. For example, the delay time calculation unit 107 compares the DAB broadcast audio data stored in the DAB buffer 103 with the IP broadcast audio data stored in the IP buffer 106, and the DAB broadcast stored in the DAB buffer 103. The same data as the audio data of the IP broadcast stored in the IP buffer 106 is specified from the audio data. Then, the delay time calculation unit 107 receives the IP broadcast from the DAB broadcast based on the reception timing of the audio data of the IP broadcast stored in the IP buffer 106 and the reception timing of the same data specified from the DAB buffer 103. Calculate the delay time. Then, the delay time calculation unit 107 synchronizes the output timing of the DAB broadcast with the output timing of the IP broadcast based on the calculated delay time and the delay rate of the audio data applied when performing the delay processing of the DAB broadcast. The delay processing time to be performed is calculated. For example, when the calculated delay time is “10 seconds” and the delay rate applied to the DAB broadcast delay process is “200%”, the delay time calculation unit 107 sets “20 seconds” as the delay processing time. calculate.

  The delay time calculation unit 107 calculates a delay time from the DAB broadcast and a delay processing time to be performed in order to synchronize the DAB broadcast for each IP broadcast received by the second reception unit 104. For example, when the second receiving unit 104 receives the IP broadcast A, the delay time calculation unit 107 and the delay process to be performed in order to synchronize the DAB broadcast with the IP broadcast A from the DAB broadcast. Each time is calculated. After that, when receiving a notification from the second receiver 104 that the IP broadcast received by the second receiver 104 has been switched to the IP broadcast B, the delay time calculator 107 receives the delay of the IP broadcast B from the DAB broadcast. The delay processing time to be performed in order to synchronize the DAB broadcast with the IP broadcast B is calculated.

  In addition, when the IP broadcast received by the second receiving unit 104 is switched, the delay time calculating unit 107 calculates the processing time of the delay processing already performed by the delay processing unit 108 from the delay processing time calculated for the switched IP broadcast. By subtracting, the remaining delay processing time is calculated.

  Here, the delay time calculation unit 107 sets the timing at which the IP broadcast is switched as the starting point of the remaining delay processing time (hereinafter, referred to as “first starting point”). The delay time calculation unit 107 subtracts the processing time of the delay processing already performed by the delay processing unit 108 before the IP broadcast is switched from the delay processing time of the IP broadcast after the switching, so that the IP broadcast is switched. The remaining delay processing time to be performed later by the delay processing unit 108 is calculated.

  Also, the delay time calculation unit 107 determines the timing of calculating the delay processing time of the switched IP broadcast after the switching of the IP broadcast as the time of calculating the remaining delay processing time (hereinafter referred to as “second time of calculation”). "). In this case, the delay time calculation unit 107 subtracts the processing time of the delay processing already performed by the delay processing unit 108 before the delay processing time is calculated from the delay processing time of the IP broadcast after switching, The remaining delay processing time that should be performed by the delay processing unit 108 after the delay processing time is calculated is calculated.

  The delay processing unit 108 performs a delay process (time stretch) on the audio data of the DAB broadcast according to the delay time calculated by the delay time calculation unit 107. Thereby, the delay processing unit 108 synchronizes the output timing of the audio data of DAB broadcast output from the output control unit 109 with the output timing of the audio data of IP broadcast output from the output control unit 109.

  Here, when the delay processing unit 108 performs a delay process on the DAB broadcast audio data, the IP broadcast audio data received by the second receiving unit 104 has been transmitted via another provider. When switching to other IP broadcast audio data, delay processing is continued until the output timing of DAB broadcast audio data is synchronized with the output timing of other IP broadcast audio data.

  Specifically, the delay processing unit 108 performs processing of delay processing already performed until the IP broadcast is switched when the IP broadcast received by the second receiving unit 104 is switched while performing the delay processing of the DAB broadcast. The time is notified to the delay time calculation unit 107. In response to this, when the delay time calculation unit 107 calculates the remaining delay processing time, the delay processing unit 108 continues to perform the delay processing for the calculated remaining delay processing time.

[Example of processing by broadcast receiving apparatus 10]
FIG. 2 is a flowchart showing an example of processing by the broadcast receiving apparatus 10 according to the first embodiment of the present invention. The process illustrated in FIG. 2 is executed, for example, when the power of the broadcast receiving apparatus 10 is switched on.

  Although not shown in FIG. 2, when the broadcast receiver 10 is turned on, the first receiver 101 receives the DAB broadcast, the first demodulator 102 demodulates the digital audio signal, and the second The reception of the IP broadcast by the receiving unit 104 and the demodulation of the digital audio signal by the second demodulating unit 105 are performed in parallel.

  Here, the second receiving unit 104 first receives IP broadcast A (IP broadcast via the provider 30A), and thereafter, the IP broadcast received by the second receiving unit 104 is transmitted from IP broadcast A to IP broadcast B ( An example of switching to (IP broadcasting via the provider 30B) will be described. Here, the starting point of the remaining delay processing time is the first starting point (timing when the IP broadcast is switched).

  First, the DAB buffer 103 stores DAB broadcast audio data received by the first receiving unit 101 (step S202). Further, the IP buffer 106 stores the audio data of the IP broadcast A received by the second receiving unit 104 (step S204). Then, the delay time calculation unit 107 calculates the delay time of the IP broadcast A from the DAB broadcast based on the audio data stored in the DAB buffer 103 and the audio data stored in the IP buffer 106 (step S206). ). Further, the delay time calculation unit 107 calculates a delay processing time to be performed to eliminate the delay time according to the delay time calculated in step S206 (step S208). Further, the delay processing unit 108 performs a delay process on the DAB broadcast audio data according to the delay processing time calculated in step S208 (step S210).

  Thereafter, the second receiving unit 104 determines whether or not the received IP broadcast has been switched to another IP broadcast transmitted via another provider (step S212). Here, when the second receiving unit 104 determines that the received IP broadcast has not been switched to another IP broadcast (step S212: No), the broadcast receiving device 10 advances the process to step S220.

  On the other hand, when the second receiving unit 104 determines that the received IP broadcast has been switched to another IP broadcast (step S212: Yes), the delay time calculating unit 107 starts counting the remaining delay processing time and DAB. The delay time of another IP broadcast from the broadcast (that is, IP broadcast B) is calculated (step S214). Further, the delay time calculation unit 107 calculates a delay processing time to be performed in order to eliminate the delay time according to the delay time calculated in step S214 (step S216). Then, the delay time calculation unit 107 calculates the remaining delay processing time by subtracting the processing time of the delay processing performed by the delay processing unit 108 before the IP broadcast is switched from the delay processing time calculated in step S216. (Step S218). Thereafter, the broadcast receiving apparatus 10 advances the processing to step S220.

  In step S220, the delay processing unit 108 performs the delay processing time calculated by the delay time calculating unit 107 in step S208 (when transitioned from step S212), or the remaining time calculated by the delay time calculating unit 107 in step S218. It is determined whether or not the delay processing time (when transiting from step S218) has ended. Here, when the delay processing unit 108 determines that the delay processing time has not ended (step S220: No), the broadcast receiving device 10 continues the delay processing of step S210. On the other hand, when the delay processing unit 108 determines that the delay processing time has ended (step S220: Yes), the broadcast receiving apparatus 10 ends the series of processes illustrated in FIG.

[Example of processing timing]
FIG. 3 is a diagram illustrating an example of processing timing by the broadcast receiving apparatus 10 according to the first embodiment of the present invention. Here, IP broadcast includes IP broadcast A and IP broadcast B. An example will be described in which audio data having the same content is broadcast as “1”, “2”, “3”, “4”,... In both DAB broadcasting and IP broadcasting A and B. Here, one frame of audio data is schematically shown on the assumption that it is audio data of a predetermined time (for example, 1 second). Here, “200%” is applied as a delay rate when DAB broadcast audio data is delayed.

  As shown in FIG. 3, the audio data of DAB broadcast and the audio data of IP broadcasts A and B have the same contents, but IP broadcasts A and B are broadcasters 40a and 40b to providers 30A and 30B, Internet servers. Since it is transmitted to the broadcast receiving device via 20, it is received with a delay from the DAB broadcast. In the example shown in FIG. 3, IP broadcast A is delayed by two frames of audio data from DAB broadcast. Also, IP broadcast B is received with a delay from IP broadcast A because the provider through which it differs is different from IP broadcast A. In the example shown in FIG. 3, IP broadcast B is delayed by three frames of audio data from IP broadcast A. That is, IP broadcast B is delayed by 5 frames of audio data from DAB broadcast.

  In the example illustrated in FIG. 3, first, the delay processing unit 108 is configured so that the second receiving unit 104 receives the IP broadcast A and the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast A. DAB broadcast delay processing is performed. After that, since the IP broadcast received by the second receiving unit 104 is switched to the IP broadcast B, the delay processing unit 108 performs the delay process of the DAB broadcast so that the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast B. ing.

  Specifically, first, when the power of the broadcast receiving apparatus 10 is switched on (timing t1), the first receiving unit 101 starts receiving DAB broadcasts, and the second receiving unit 104 receives IP broadcast A. To start. Then, the delay time calculation unit 107 eliminates the delay time (for two frames of audio data) of the IP broadcast A received by the second receiver 104 from the DAB broadcast received by the first receiver 101 and the delay time. When the delay processing time (four frames of audio data) to be performed is calculated (timing t2), the delay processing unit 108 at this timing causes the output audio of the DAB broadcast to be output according to the calculated delay processing time. Perform delay processing.

  Then, when the delay processing unit 108 performs the DAB broadcast delay process, the IP broadcast received by the second receiving unit 104 is switched from the IP broadcast A to the IP broadcast B (timing t3). The unit 108 continues to perform the DAB broadcast delay processing that has been performed so far.

  Further, the delay time calculation unit 107 eliminates the delay time (for 5 frames of audio data) of the IP broadcast B received by the second reception unit 104 from the DAB broadcast received by the first reception unit 101 and the delay time. When the delay processing time to be performed (10 frames of audio data) is calculated (timing t4), the delay time calculation unit 107 has performed so far from the calculated delay processing time (10 frames of audio data). The remaining delay processing time is calculated by reducing the delay processing time of the DAB broadcast.

  For example, at the timing t4 shown in FIG. 3, the delay time calculation unit 107 calculates “sound data of 5 frames” as the delay time of the IP broadcast B. In this case, the delay time calculation unit 107 uses the delay time “5 frames of audio data” and the delay rate “200%” applied to the delay processing as the delay processing time “10 frames of audio data”. Is calculated.

  Here, at the timing t3, the delay processing unit 108 has already performed a delay process (delay process for the audio data “5”) with a delay process time corresponding to two frames of the audio data. Therefore, the delay time calculation unit 107 calculates “sound data of 8 frames” as the remaining delay processing time when the timing t3 (that is, the first calculation time) is set as the remaining delay processing time. In response to this, the delay processing unit 108 performs delay processing of DAB broadcasting (delay processing for audio data “6” to “9”) for the remaining calculated delay processing time (for 8 frames of audio data) after timing t3. ) Is subsequently performed (timing t3 to t5). Thereby, the output timing of the DAB broadcast and the output timing of the IP broadcast B are synchronized (timing t5). Therefore, the broadcast receiving apparatus 10 can perform seamless switching from DAB broadcast to IP broadcast B.

  On the other hand, at timing t4, the delay processing unit 108 has already performed a delay process (delay process for the audio data “5” to “7”) with the delay time of 6 frames of audio data. Therefore, when the timing t4 (that is, the second calculation time point) is set as the start time of the remaining delay processing time, the delay time calculation unit 107 calculates “four frames of audio data” as the remaining delay processing time. In response to this, the delay processing unit 108 performs delay processing for DAB broadcasting (delay processing for audio data “8” to “9”) for the remaining calculated delay processing time (for four frames of audio data) after timing t4. ) Is continued (timing t4 to t5). Thereby, the output timing of the DAB broadcast and the output timing of the IP broadcast B are synchronized (timing t5). Therefore, the broadcast receiving apparatus 10 can perform seamless switching from DAB broadcast to IP broadcast B.

  In the example shown in FIG. 3, compared with the conventional method shown in FIG. 7, the DAB broadcast output timing and the IP broadcast B output timing are synchronized (timing t5) without missing the DAB broadcast audio data. ) Is advanced by 6 frames of audio data.

  As described above, according to the broadcast receiving apparatus 10 of the first embodiment, the second reception is performed when the DAB broadcast delay process is performed in order to synchronize the output timing of the DAB broadcast with the output timing of the IP broadcast A. When the IP broadcast received by the unit 104 is switched from the IP broadcast A to the IP broadcast B, the delay processing that has been performed so far is continuously performed without interruption, and the output timing of the DAB broadcast is determined by the delay processing. It becomes synchronized with the output timing of the broadcast B. For this reason, the delay processing time of DAB broadcasting can be shortened, and the loss of DAB broadcasting audio data can be avoided.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a block diagram showing a functional configuration example of a broadcast receiving apparatus 10 ′ according to the second embodiment of the present invention. The broadcast receiving device 10 ′ shown in FIG. 4 is different from the broadcast receiving device 10 of the first embodiment (see FIG. 1) in that a delay processing unit 108 ′ is provided instead of the delay processing unit 108.

  In addition to the function of the delay processing unit 108 of the first embodiment, the delay processing unit 108 ′ has a threshold for the number of IP broadcast switching received by the second receiving unit 104 when performing delay processing of DAB broadcasting. If it exceeds, it further has a function of canceling the delay processing.

[Example of processing by broadcast receiving apparatus 10 ']
FIG. 5 is a flowchart showing an example of processing by the broadcast receiving device 10 ′ according to the second embodiment of the present invention. The process illustrated in FIG. 5 is executed, for example, when the power of the broadcast receiving device 10 ′ is switched on. Here, the starting point of the remaining delay processing time is the first starting point (timing when the IP broadcast is switched).

  First, the DAB buffer 103 stores DAB broadcast audio data received by the first receiving unit 101 (step S502). Further, the IP buffer 106 stores the audio data of IP broadcast A received by the second receiving unit 104 (step S504). Then, the delay time calculation unit 107 calculates the delay time of the IP broadcast A from the DAB broadcast based on the audio data stored in the DAB buffer 103 and the audio data stored in the IP buffer 106 (step S506). ). Further, the delay time calculation unit 107 calculates a delay processing time to be performed in order to eliminate the delay time according to the delay time calculated in step S506 (step S508). Further, the delay processing unit 108 performs a delay process on the DAB broadcast audio data according to the delay time calculated in step S508 (step S510).

  Thereafter, the second receiving unit 104 determines whether or not the received IP broadcast has been switched to another IP broadcast transmitted via another provider (step S512). Here, when the second receiving unit 104 determines that the received IP broadcast has not been switched to another IP broadcast (step S512: No), the broadcast receiving device 10 advances the process to step S526.

  On the other hand, when the second receiving unit 104 determines that the received IP broadcast has been switched to another IP broadcast (step S512: Yes), the delay processing unit 108 ′ starts counting the remaining delay processing time and switches 1 is added to the number of times (the initial value is 0) (step S514). Then, the delay processing unit 108 'determines whether or not the number of times of switching has exceeded a predetermined threshold (for example, 3 times) (step S516). Here, when the delay processing unit 108 ′ determines that the number of times of switching exceeds a predetermined threshold (step S516: Yes), the delay processing unit 108 ′ stops the DAB broadcast delay processing (step S518), and broadcasts. The receiving apparatus 10 ends the series of processes shown in FIG.

  On the other hand, when the delay processing unit 108 ′ determines that the number of switching times does not exceed the predetermined threshold (step S516: No), the delay time calculating unit 107 calculates the delay time from the DAB broadcast of the IP broadcast after the switch. (Step S520). Further, the delay time calculation unit 107 calculates a delay processing time to be performed in order to eliminate the delay time according to the delay time calculated in step S520 (step S522). Then, the delay time calculation unit 107 calculates the remaining delay processing time by subtracting the processing time of the delay processing performed by the delay processing unit 108 ′ before the IP broadcast is switched from the delay processing time calculated in step S522. (Step S524). Thereafter, the broadcast receiving apparatus 10 advances the processing to step S526.

  In step S526, the delay processing unit 108 ′ uses the delay processing time calculated by the delay time calculating unit 107 in step S508 (when transitioned from step S512), or the remaining calculated by the delay time calculating unit 107 in step S524. It is determined whether or not the delay processing time (when transitioning from step S524) has ended. Here, when the delay processing unit 108 'determines that the delay processing time has not ended (step S526: No), the broadcast receiving apparatus 10' continues to execute the delay processing of step S510. On the other hand, when the delay processing unit 108 'determines that the delay processing time has ended (step S526: Yes), the broadcast receiving device 10' ends the series of processes illustrated in FIG.

[Example of processing timing]
FIG. 6 is a diagram illustrating an example of processing timing by the broadcast receiving device 10 ′ according to the second embodiment of the present invention. Here, the IP broadcast includes IP broadcasts A, B, C, D, and E, and is an IP broadcast that is transmitted via the providers 30A, 30B, 30C, 30D, and 30E, respectively. Here, when the delay processing unit 108 ′ performs DAB broadcast delay processing in order to synchronize the output timing of the DAB broadcast with the output timing of the IP broadcast A, the second reception unit 104 receives the delay. An example will be described in which the delay processing unit 108 ′ stops the DAB broadcast delay process when the number of IP broadcast switching exceeds three, which is a predetermined threshold.

  In the example shown in FIG. 6, first, when the power of the broadcast receiving device 10 ′ is switched on (timing t1), the first receiving unit 101 starts receiving DAB broadcasts, and the second receiving unit 104 receives IP broadcasts. Start receiving A. Then, when the delay time calculation unit 107 calculates the delay time of the IP broadcast A from the DAB broadcast and the delay processing time to be performed to eliminate the delay time (timing t2), the delay processing unit at this timing 108 'performs a delay process on the audio data of the DAB broadcast according to the calculated delay process time.

  Then, the IP broadcast received by the second receiver 104 is switched from the IP broadcast A to the IP broadcast B when the delay processing unit 108 'is performing the DAB broadcast delay process (timing t3). Further, the IP broadcast received by the second receiver 104 is from IP broadcast B to IP broadcast C (timing t4), from IP broadcast C to IP broadcast D (timing t5), and from IP broadcast D to IP broadcast E (timing t4). t6), switching is performed sequentially. Each time the IP broadcast received by the second receiving unit 104 is switched, the delay time calculating unit 107 calculates the delay time, the delay processing time, and the remaining delay processing time. Then, the delay processing unit 108 'continues to perform DAB broadcast delay processing for the remaining calculated delay processing time. It should be noted that the delay processing unit 108 ′ starts the DAB broadcast delay process until the IP broadcast received by the second receiving unit 104 is switched to the IP broadcast E (timing t2 to t6). Continues to be done.

  Here, when switching from the IP broadcast D to the IP broadcast E is performed, the number of switching of the IP broadcast received by the second receiving unit 104 is four, which exceeds the threshold of three. For this reason, the delay processing unit 108 ′ stops the DAB broadcast delay processing at the timing (timing t <b> 6) when the IP broadcast D is switched to the IP broadcast E. Thereafter, from the output control unit 109, the audio data (that is, the audio data after the audio data “9”) following the audio data (that is, the audio data “8”) when the delay processing is stopped is time-stretched. It is output without.

  After the delay processing is stopped, the output timing of DAB broadcast is not synchronized with the output timing of IP broadcast E, but it becomes necessary to switch to IP broadcast E due to the deterioration of the DAB broadcast reception environment. In this case, the output control unit 109 can immediately switch to the IP broadcast E.

  As described above, according to the broadcast receiving apparatus 10 ′ of the second embodiment, the number of IP broadcast switching received by the second receiving unit 104 exceeds a predetermined threshold value when performing delay processing of DAB broadcasting. In this case, the DAB broadcast delay process is stopped. For this reason, it is possible to avoid a situation where the delay process of DAB broadcasting does not end indefinitely and switching to IP broadcasting cannot be performed. Even in the broadcast receiving device 10 ′ of the second embodiment, even if the IP broadcast received by the second receiving unit 104 is switched until the number of IP broadcast switching exceeds a predetermined threshold, the broadcast is performed by that time. The delay processing continues without interruption. For this reason, the delay processing time of DAB broadcasting can be shortened, and the loss of DAB broadcasting audio data can be avoided.

  In the first and second embodiments, the DAB broadcast is applied as the first standard broadcast and the IP broadcast is applied as the second standard broadcast. However, the present invention is not limited to this. For example, FM broadcast may be applied as the first standard broadcast, and IP broadcast may be applied as the second standard broadcast.

  In the first and second embodiments, the DAB broadcast audio data stored in the DAB buffer 103 and the IP broadcast audio data stored in the IP buffer 106 are compared to compare the IP broadcast from the DAB broadcast. Although the delay time is calculated, the present invention is not limited to this. For example, a time difference between time information given to DAB broadcast data and time information given to IP broadcast communication data may be calculated as a delay time of IP broadcast from DAB broadcast. .

  Moreover, although the said 1st, 2nd embodiment demonstrated the example which applies this invention to the case where the path | route of IP broadcasting differs by several providers 30A-30E, this invention is not restricted to this. For example, the present invention can be applied to a case where the route of IP broadcasting is different among a plurality of Internet servers.

  In the second embodiment, the predetermined threshold value regarding the number of times of IP broadcast switching, which is a criterion for determining whether or not to end the DAB broadcast delay processing, is set to three times. However, the present invention is not limited to this.

  In addition, each of the above-described embodiments is merely an example of a specific example for carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

10, 10 ′ Broadcast receiving device 11 Amplifier 12 Speaker 101 First receiving unit 102 First demodulating unit 103 DAB buffer 104 Second receiving unit 105 Second demodulating unit 106 IP buffer 107 Delay time calculating unit 108, 108 ′ Delay processing unit 109 Output control unit

Claims (7)

A first receiver for receiving a first standard broadcast;
A second receiver for receiving a second standard broadcast delayed from the first standard broadcast;
A delay time calculating unit for calculating a delay time of the second standard broadcast received by the second receiver from the first standard broadcast received by the first receiver;
By performing a delay process on the first standard broadcast data according to the delay time calculated by the delay time calculation unit, the output timing of the first standard broadcast data is set to the second standard broadcast data. A broadcast receiving device including a delay processing unit that synchronizes with the output timing of
When the delay processing unit is performing the delay processing, the second standard broadcast data received by the second receiving unit is transmitted via another route. When the broadcast data is switched to the broadcast data, the delay processing is continued until the output timing of the first standard broadcast data is synchronized with the output timing of the other second standard broadcast data. apparatus. When the second standard broadcast data received by the second receiving unit is switched to the other second standard broadcast data,
The delay time calculation unit calculates a delay time of the other second standard broadcast from the first standard broadcast and a delay processing time to be performed in order to eliminate the delay time. By reducing the processing time of the delay processing performed by the delay processing unit before switching of the second standard broadcast data from the delay processing time, the remaining delay processing time to be performed after switching of the second standard broadcast data To calculate
2. The broadcast receiving apparatus according to claim 1, wherein the delay processing unit continues the delay processing for the remaining calculated delay processing time after switching of the broadcast data of the second standard. When the second standard broadcast data received by the second receiving unit is switched to the other second standard broadcast data,
The delay time calculation unit calculates a delay time of the other second standard broadcast from the first standard broadcast and a delay processing time to be performed in order to eliminate the delay time. By calculating the remaining delay processing time to be performed after calculating the delay processing time by subtracting the processing time of the delay processing performed by the delay processing unit before calculating the delay processing time from the delay processing time,
The broadcast receiving apparatus according to claim 1, wherein the delay processing unit continues the delay processing for the remaining calculated delay processing time after calculating the delay processing time. The delay processing unit, when performing the delay processing, stops the delay processing when the number of switching times of the second standard broadcast data received by the second receiving unit exceeds a predetermined threshold. The broadcast receiving apparatus according to any one of claims 1 to 3, wherein   5. The broadcast receiving apparatus according to claim 1, wherein the first standard broadcast is a DAB broadcast, and the second standard broadcast is an IP broadcast. 6.   5. The broadcast receiving apparatus according to claim 1, wherein the broadcast of the first standard is FM broadcast, and the broadcast of the second standard is IP broadcast. 6. An output control method by a broadcast receiving apparatus including an output control unit that selectively switches and outputs a first standard broadcast and a second standard broadcast delayed from the first standard broadcast,
A delay time calculating step in which a delay time calculating unit of the broadcast receiving device calculates a delay time of the second standard broadcast from the first standard broadcast;
The delay processing unit of the broadcast receiving device performs a delay process on the first standard broadcast data according to the delay time calculated in the delay time calculation step, so that the broadcast data of the first standard is A first delay processing step of synchronizing the output timing with the output timing of the broadcast data of the second standard;
When the delay processing unit performs the delay processing in the first delay processing step, the second standard broadcast data received by the second receiving unit is transmitted via another path. When switching to the other broadcast data of the second standard, the delay processing is performed until the output timing of the broadcast data of the first standard is synchronized with the output timing of the broadcast data of the other second standard. And a second delay processing step to be performed subsequently.

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