JP6422382B2 - Broadcast receiving apparatus and output control method - Google Patents

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. There is known a method of synchronizing the output timing of audio data of DAB broadcast with the output timing of audio data of IP broadcast by performing delay processing (time stretch) on the.

  FIG. 9 is a diagram illustrating an example of processing timing by a conventional broadcast receiving apparatus. Here, 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. In addition, here, one frame of audio data is schematically illustrated on the assumption that the audio data is a predetermined time (for example, 1 second).

  As shown in FIG. 9, the DAB broadcast audio data and the IP broadcast audio data have the same contents, but the IP broadcast is transmitted from the broadcast station to the broadcast receiving device via a provider, an Internet server, or the like. Therefore, it is received later than the DAB broadcast. In the example shown in FIG. 9, the IP broadcast is delayed by 4 frames of audio data from the DAB broadcast.

  Therefore, in the example shown in FIG. 9, the DAB broadcast audio data is delayed by performing a delay process on the DAB broadcast audio data so that switching from the DAB broadcast audio output to the IP broadcast audio output can be performed seamlessly. Is synchronized with the output timing of the audio data of the IP broadcast.

  Specifically, first, when the power is switched on (timing t1), the broadcast receiving apparatus starts receiving audio data of DAB broadcast and IP broadcast. Then, the broadcast receiving apparatus calculates the delay time of the IP broadcast from the DAB broadcast (timing t2). At this timing, the broadcast receiving apparatus performs a DAB broadcast output audio delay process according to the calculated delay time.

  Specifically, the broadcast receiving apparatus time-stretches the DAB broadcast audio data by the required number of frames so that the calculated delay time of the IP broadcast is eliminated (timing t2 to t3). Time stretching is to lower the frequency of audio data output processing and extend the output time of the audio data.

  With this delay processing, the broadcast receiving apparatus eliminates the delay time of the IP broadcast from the DAB broadcast, and the DAB broadcast output timing is synchronized with the IP broadcast output timing (state after the timing t3). Seamless switching from broadcasting to IP broadcasting can be performed.

  However, when performing a delay process on DAB broadcast audio data, the conventional broadcast receiving apparatus delays the audio data using a certain delay rate (the ratio of the output time after the delay process to the output time before the delay process). I am letting. For this reason, while the broadcast receiving apparatus is performing the delay process, there has been a problem that the user must listen to the sound modulated by the delay process for a long time.

  For example, in the example shown in FIG. 9, in order to synchronize the output timing of the DAB broadcast with the output timing of the IP broadcast, the four frames of audio data “7” to “10” of the DAB broadcast are delayed. In the example shown in FIG. 9, the output time of each of the audio data “7” to “10” is extended using a certain delay rate (200% in the example of FIG. 9). In this case, the user is modulated by the delay process for a long time during which the audio data “7” to “10” is output (corresponding to an output time of 8 frames of audio data not time-stretched). You must keep listening to the voice.

  In the example of FIG. 9, the delay rate is set to 200% for the sake of easy understanding. However, since the delay rate is actually about 110%, the output time of the modulated sound is longer. It is thought that.

  The present invention has been made in order to solve such a problem, and in a broadcast receiver configured to synchronize two broadcasts by delay processing, the time during which the sound modulated by the delay processing is output. The purpose is to be able to shorten the time.

In order to solve the above-described problem, in the present invention, the delay time of the second standard broadcast from the first standard broadcast is calculated, and for the audio data of the first standard broadcast according to the calculated delay time, By performing the delay process, in the broadcast receiving apparatus adapted to synchronize the output timing of the audio data of the first standard broadcast with the output timing of the audio data of the second standard broadcast, the audio of the first standard broadcast In the delay processing for data, the output time of data including sound is extended using a predetermined delay rate that is not zero, while the output of data not including sound is performed using a delay rate higher than the delay rate of data including sound. while to stretch the time, upon stretching of the output time of the data, the data that does not include the audio after stretching causes eliminate the delay time calculated If the output time of data that does not include audio is extended using a variable delay rate so that the length is as long as possible, while the data that does not include audio after extension is longer than a predetermined threshold, the predetermined threshold The output time of data that does not include voice is extended using a variable delay rate so as to be the same length as. In another aspect of the present invention, when the data output time is extended, the data output time without data is increased by using a fixed delay rate for the data not including the sound for each predetermined length. When the continuous output time of the data not including the voice after extending the data that does not include the voice reaches a predetermined threshold, the data including the voice after the data not including the voice is detected, The output time of data including the detected voice is extended.

  According to the present invention configured as described above, in the delay process for the audio data of the first standard broadcast, the proportion of the output time of the data that does not include the sound in the entire output time of the audio data stretched by the delay process On the other hand, the ratio of the output time of data including voice decreases. For this reason, according to the present invention, it is possible to shorten the time during which the sound modulated by the delay processing is output.

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 (1st example) of the process by the broadcast receiver which concerns on 1st Embodiment of this invention. It is a figure which shows an example (1st example) of the process timing by the broadcast receiver which concerns on 1st Embodiment of this invention. It is a flowchart which shows an example (2nd example) of the process by the broadcast receiver which concerns on 1st Embodiment of this invention. It is a figure which shows an example (2nd 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 capable of selectively switching between IP audio data (an example of broadcast audio data) and IP audio data (an example of audio data of the second standard broadcast) and outputting 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. , A silence data detector 108, a delay processor 109, and an output controller 110 are provided.

  Each of the functional blocks 101 to 110 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 110 is actually configured by including a CPU, RAM, ROM, etc. of a computer, and a program 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 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 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. The first receiving unit 101 directly receives a DAB broadcast wave, whereas the second receiving unit 104 receives IP broadcast communication data transmitted from a broadcast station via a provider and an Internet server. Because.

  The output control unit 110 receives the audio data of the DAB broadcast (DAB broadcast demodulated by the first demodulation unit 102) received by the first reception unit 101 and the IP broadcast (second demodulation) received by the second reception unit 104. IP broadcast after demodulation by the unit 105) and audio data are selectively switched and output. For example, when the received signal strength of DAB broadcasting is higher than a predetermined threshold, the output control unit 110 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 110 switches to IP broadcasting and outputs it. That is, the output control unit 110 preferentially outputs a DAB broadcast having a higher quality than the IP broadcast. The audio data output from the output control unit 110 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.

  Note that the delay time calculation unit 107 calculates the remaining delay time every time the data subject to delay processing by the delay processing unit 109 is switched from silence data to sound data and each time the sound data is switched to silence data. To do. For example, when the delay processing unit 109 first performs the delay processing of the silence data, and the target data for the delay processing is switched from the silence data to the voice data, the delay time calculation unit 107 calculates the delay time calculated first. Therefore, the remaining delay time after the delay processing of the silence data is calculated by subtracting the delay time eliminated by the delay processing of the silence data.

  After that, after the delay processing unit 109 performs the delay processing of the sound data, when the target data of the delay processing is switched from the sound data to the silence data, the delay time calculation unit 107 calculates after the delay processing of the silence data. The remaining delay time after the delay processing of the sound data is calculated by subtracting the delay time eliminated by the delay processing of the sound data from the remaining delay time.

  Silence data detection unit 108 detects audio data that does not contain audio (hereinafter referred to as “silent data”) from audio data of DAB broadcast. In addition, the silence data detection unit 108 detects the length of the silence data. For example, the silence data detection unit 108 detects mute, zero data, data having a DAB-BER (Bit Error Rate) higher than a predetermined threshold as silence data. When FM broadcasting is applied as the first standard broadcasting, data having a maximum instantaneous frequency deviation (Deviation) lower than a predetermined threshold can be detected as silence data.

  The delay processing unit 109 performs delay processing (time stretch) on the DAB broadcast audio data according to the delay time calculated by the delay time calculation unit 107. Thus, the delay processing unit 109 synchronizes the output timing of the DAB broadcast audio data output from the output control unit 110 with the output timing of the IP broadcast audio data output from the output control unit 110.

  Here, the delay processing unit 109 detects silence data using a delay rate higher than the delay rate of audio data including audio (hereinafter referred to as “sound data”) in the delay processing for audio data of DAB broadcasting. The silence data detected by the unit 108 is time stretched. In particular, in the first embodiment, the delay processing unit 109 performs time stretching of the silent data in a range where the output time after time stretching of the silent data does not exceed a predetermined threshold th.

  As an example, the delay processing unit 109 outputs the silence data using a variable delay rate according to the length of the silence data and a predetermined threshold th so that the stretched silence data has a predetermined length. Stretch time. Specifically, the delay processing unit 109 extends the output time of the silence data by using a variable delay rate so that the expanded silence data has a length that can eliminate the remaining delay time. . Here, when the expanded silence data is longer than the predetermined threshold th, the delay processing unit 109 uses the variable delay rate so that the length of the silence data is the same as the predetermined threshold th. Increase output time.

  As another example, the delay processing unit 109 extends the silent data output time within a range not exceeding a predetermined threshold th by using a fixed delay rate for each predetermined length of the silent data. The delay processing unit 109 detects the voice data after the silence data when the continuous output time of the silence data reaches the predetermined threshold th by extending the silence data, and detects the detected voice data. Extend the output time of.

[Example of processing by broadcast receiving apparatus 10 (first example)]
FIG. 2 is a flowchart showing an example (first 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. In this first example, an example will be described in which the delay processing unit 109 extends the output time of silence data using a variable delay rate.

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

  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 IP broadcast audio data received by the second receiving unit 104 (step S204). Then, the delay time calculation unit 107 calculates the delay time of the IP broadcast 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 processing unit 109 starts delay processing for DAB broadcast audio data in accordance with the delay processing calculated in step S206 (step S208).

  In this delay process, first, the silence data detection unit 108 extracts data having a predetermined length from the audio data to be subjected to the delay process (step S210). Then, the silence data detection unit 108 determines whether or not the data having the predetermined length extracted in step S210 is silence data (step S212). Here, when the silence data detection unit 108 determines that the predetermined length of data is not silence data (step S212: No), the delay processing unit 109 uses the predetermined length of data for the voice data. Time stretching is performed at a fixed delay rate (step S226).

  Whether or not the delay processing unit 109 has eliminated the remaining delay time (the delay time calculated in step S206 in the case of voiced data immediately after the start of time stretching) by the time stretching of the voiced data in step S226. Is determined (step S228). If the delay processing unit 109 determines that the remaining delay time has been eliminated (step S228: Yes), the delay processing unit 109 ends the DAB broadcast delay processing (step S230), and the broadcast receiving apparatus 10 Then, the series of processes shown in FIG.

  On the other hand, when the delay processing unit 109 determines that the remaining delay time has not been eliminated (step S228: No), the broadcast receiving device 10 executes the processing after step S210 again.

  On the other hand, when the silence data detection unit 108 determines in step S212 that the data having the predetermined length is silence data (step S212: Yes), the delay time calculation unit 107 performs the delay processing by the delay processing unit 109. The remaining delay time is calculated by subtracting the delay time eliminated by the delay processing by the delay processing unit 109 from the calculated delay time (step S214). Further, the silence data detection unit 108 specifies the length of the silence data (step S216). Then, the delay processing unit 109 times the silence data until the remaining delay time calculated by the delay time calculation unit 107 (the delay time calculated in step S206 in the case of silence data immediately after the start of time stretching) is eliminated. When it is assumed that stretching is performed, it is determined whether or not the output time of the silent data after time stretching becomes larger than the threshold th (step S218).

  Here, when the delay processing unit 109 determines that the output time of the silence data after time stretching becomes larger than the threshold th (step S218: Yes), the delay processing unit 109 has the same output time of the silence data as the threshold th. The silence data is time-stretched using the delay rate as a length (step S222). After the time stretching of the silence data is completed, the delay time calculation unit 107 subtracts the delay time eliminated by the time stretching of the silence data from the delay time calculated before the time stretching of the silence data, thereby remaining delay. Time is calculated (step S224). Thereafter, the delay processing unit 109 time-stretches the next voice data after the silent data with a fixed delay rate for the voice data (step S226). Then, the broadcast receiving apparatus 10 advances the process to the above-described determination process in step S228.

  On the other hand, when the delay processing unit 109 determines that the output time of the silence data after time stretching is not greater than the threshold th (step S218: No), the delay processing unit 109 outputs the remaining delay time of the silence data. The silence data is time-stretched using the delay rate that is the output time that can eliminate (step S220). When the time stretching of the silent data ends, the delay processing unit 109 ends the DAB broadcast delay process (step S230), and the broadcast receiving apparatus 10 ends the series of processes shown in FIG.

[Example of processing timing (first example)]
FIG. 3 is a diagram illustrating an example (first example) of processing timing by the broadcast receiving device 10 according to the first embodiment of the present invention. FIG. 3A shows an example in which silence data for one frame of audio data is included at the head of the target data for delay processing. FIG. 3B shows an example in which silence data for two frames of audio data is included at the head of the target data for delay processing. Here, 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. In addition, here, one frame of audio data is schematically illustrated on the assumption that the audio data is a predetermined time (for example, 1 second).

  As shown in FIGS. 3 (a) and 3 (b), DAB broadcast audio data and IP broadcast audio data have the same contents, but IP broadcast is transmitted from a broadcasting station via a provider, an Internet server, or the like. Since it is transmitted to the broadcast receiving apparatus 10, it is received with a delay from the DAB broadcast. In the example shown in FIGS. 3A and 3B, the IP broadcast is delayed by four frames of audio data from the DAB broadcast.

  Therefore, in the example shown in FIGS. 3A and 3B, delay processing is performed on DAB broadcast audio data so that the switching from DAB broadcast audio output to IP broadcast audio output can be performed seamlessly. Thus, the output timing of the audio data of DAB broadcast is synchronized with the output timing of the audio data of IP broadcast.

  Specifically, first, when the power of the broadcast receiving apparatus 10 is switched on (timing t1), the first receiving unit 101 starts receiving DAB broadcasting, and the second receiving unit 104 receives IP broadcasting. Start. When the delay time calculation unit 107 calculates the delay time of the IP broadcast from the DAB broadcast (timing t2), at this timing, the delay processing unit 109 outputs the output sound of the DAB broadcast according to the calculated delay time. Delay processing is performed.

  Specifically, the delay processing unit 109 time-stretches the DAB broadcast audio data by the required number of frames so that the calculated IP broadcast delay time is eliminated (timing t2 to t3).

  By this delay processing, the delay processing unit 109 eliminates the delay time of the IP broadcast from the DAB broadcast and makes the output timing of the DAB broadcast and the output timing of the IP broadcast synchronized (states after the timing t3). be able to. Therefore, the output control unit 110 can perform seamless switching from DAB broadcasting to IP broadcasting.

  Here, in FIG. 3A and FIG. 3B, since the length of the silent data at the head of the target data of the delay processing is different, different delay rates of the silent data are applied. In FIGS. 3A and 3B, “None” is given to the silence data. Also, “sound” is attached to the sound data.

  For example, in the example shown in FIG. 3A, at the delay processing start timing (timing t2), the first audio data of the DAB broadcast is silence data “7”, and the next audio data is sound data “8”. It is. At this time, the remaining delay time is four frames of audio data. The threshold th is assumed to be 4 frames of audio data.

  In this case, first, the delay processing unit 109 performs time stretching on the silence data “7” and sets the output time of the silence data “7” as an output time that can eliminate the remaining delay time. It is determined whether or not the output time of data “7” exceeds the threshold th. In the example shown in FIG. 3A, if the output time of the silence data “7” is time-stretched to 5 frames of audio data, the remaining delay time can be eliminated, but the threshold th (for 4 frames of audio data) ). Therefore, the delay processing unit 109 time stretches the silence data “7” so that the output time becomes the threshold th.

  By the time stretching of the silence data “7”, the delay time is eliminated by 3 frames of audio data. Therefore, the remaining delay time is one frame of audio data. Thereafter, the delay processing unit 109 time stretches the next sound data “8” with a fixed delay rate (200%) for useful data. As a result, the remaining delay time is eliminated, and the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast (timing t3).

  On the other hand, in the example shown in FIG. 3B, at the delay processing start timing (timing t2), the head audio data of the DAB broadcast is silence data “7”, and thereafter, silence data “8”, Data “9”, voice data “10” and so on. At this time, the remaining delay time is four frames of audio data.

  In this case, first, the delay processing unit 109 time-stretches the audio data α obtained by adding the silence data “7” and the silence data “8”, and eliminates the remaining delay time from the output time of the audio data α. It is determined whether the output time of the audio data α exceeds the threshold th when the output time is set to be able to be output. In the example shown in FIG. 3B, if the output time of the audio data α is time stretched to 6 frames of audio data, the remaining delay time can be eliminated, but the threshold th (4 frames of audio data) is set. It will exceed. Therefore, the delay processing unit 109 performs time stretching so that the output time of the audio data α becomes the threshold value th.

  Due to the time stretching of the audio data α, the delay time is eliminated for two frames of the audio data. Therefore, the remaining delay time is equivalent to two frames of audio data. Thereafter, the delay processing unit 109 time stretches the next sound data “9” with a fixed delay rate (200%) for useful data. Subsequently, the delay processing unit 109 time stretches the sound data “10” with a fixed delay rate (200%) for useful data. As a result, the remaining delay time is eliminated, and the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast (timing t3).

  In the case of FIG. 3B, the length of the silent data after time stretching is the same as that of the conventional example shown in FIG. 9, but if the threshold th is made longer than 4 frames of audio data, the time stretching is performed. The length of the subsequent silent data can be made longer than that of the conventional example shown in FIG.

[Example of processing by broadcast receiving apparatus 10 (second example)]
FIG. 4 is a flowchart showing an example (second example) of processing by the broadcast receiving apparatus 10 according to the first embodiment of the present invention. The process illustrated in FIG. 4 is executed, for example, when the power of the broadcast receiving apparatus 10 is switched on. In this second example, an example will be described in which the delay processing unit 109 extends the output time of silence data using a fixed delay rate.

  Although not shown in FIG. 4, when the broadcast receiving apparatus 10 is turned on, the DAB broadcast is received by the first receiver 101, demodulated by the first demodulator 102, and by the second receiver 104. The reception of the IP broadcast and the demodulation by the second demodulator 105 are performed in parallel.

  First, the DAB buffer 103 stores DAB broadcast audio data received by the first receiving unit 101 (step S402). Further, the IP buffer 106 stores the IP broadcast audio data received by the second receiving unit 104 (step S404). Then, the delay time calculation unit 107 calculates the delay time of the IP broadcast 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 S406). . Furthermore, the delay processing unit 109 starts delay processing for the audio data of DAB broadcast according to the delay time calculated in step S408 (step S408).

  In this delay process, first, the silence data detection unit 108 extracts data having a predetermined length from the audio data to be subjected to the delay process (step S410). Then, the silence data detection unit 108 determines whether or not the data having the predetermined length extracted in step S410 is silence data (step S412). Here, when the silence data detecting unit 108 determines that the predetermined length of data is not silence data (step S412: No), the delay processing unit 109 uses the predetermined length of data for the voice data. Time stretching is performed at a fixed delay rate (step S414).

  Whether or not the delay processing unit 109 has resolved the remaining delay time (the delay time calculated in step S406 in the case of sound data immediately after the start of the time stretch) by the time stretch of the sound data in step S414. Is determined (step S416). Here, if the delay processing unit 109 determines that the remaining delay time has been eliminated (step S416: Yes), the delay processing unit 109 ends the DAB broadcast delay processing (step S430), and the broadcast receiving apparatus 10 Then, the series of processing shown in FIG.

  On the other hand, when the delay processing unit 109 determines that the remaining delay time has not been eliminated (step S416: No), the broadcast receiving device 10 executes the processing after step S410 again.

  On the other hand, in step S412, when the silence data detection unit 108 determines that the data of the predetermined length is silence data (step S412: Yes), the delay time calculation unit 107 performs the delay processing by the delay processing unit 109. The remaining delay time is calculated by subtracting the delay time eliminated by the delay processing by the delay processing unit 109 from the calculated delay time (step S418). Then, the delay processing unit 109 time-stretches data having a predetermined length with a fixed delay rate for silence data (step S420).

  Then, the delay processing unit 109 determines whether or not the remaining delay time (the delay time calculated in step S406 in the case of silence data immediately after the start of the time stretch) has been eliminated by the time stretch of the silence data in step S420. (Step S422). Here, when the delay processing unit 109 determines that the remaining delay time has been eliminated (step S422: Yes), the delay processing unit 109 ends the DAB broadcast delay processing (step S430), and the broadcast receiving apparatus 10 Then, the series of processing shown in FIG.

  On the other hand, when the delay processing unit 109 determines that the remaining delay time has not been eliminated (step S422: No), the delay processing unit 109 determines whether or not the continuous output time of the silence data exceeds the threshold th. (Step 424). Here, when the delay processing unit 109 determines that the continuous output time of the silence data does not exceed the threshold th (step 424: No), the broadcast receiving apparatus 10 executes the processes after step S410 again.

  On the other hand, when the delay processing unit 109 determines that the continuous output time of silence data exceeds the threshold th (step 424: Yes), the delay time calculation unit 107 calculates the delay time calculated before the delay processing by the delay processing unit 109. From this, the remaining delay time is calculated by subtracting the delay time eliminated by the time stretch in step S420 (step S426).

  Thereafter, the silent data detection unit 108 detects the voiced data as the next delay processing target from the voice data after the silent data (step 428). And the broadcast receiving apparatus 10 performs the process after step S410 again.

[Example of processing timing (second example)]
FIG. 5 is a diagram illustrating an example (second example) of processing timing by the broadcast receiving device 10 according to the first embodiment of the present invention. FIG. 5A shows an example in which silence data for two frames of audio data is included at the head of the target data for delay processing. FIG. 5B shows an example in which silence data for three frames of audio data is included at the head of the target data for delay processing. 5A and 5B, the contents and reception timing of the audio data of IP broadcast and DAB broadcast are the same as those in the first embodiment (FIG. 3), and thus description thereof is omitted. However, in the example shown in FIGS. 5A and 5B, the IP broadcast is delayed by 6 frames of audio data from the DAB broadcast. The threshold value th is 6 frames of audio data.

  In the example shown in FIGS. 5A and 5B, one frame of audio data is used as data of a predetermined length, and time stretching is performed for each frame of audio data. Also, a fixed delay rate (300%) is applied as the delay rate of silent data. Further, a fixed delay rate (200%) is applied as the delay rate of the sound data. In FIGS. 5A and 5B, “no” is added to the silence data. Also, “sound” is attached to the sound data.

  For example, in the example shown in FIGS. 5A and 5B, the audio data at the head of the DAB broadcast is silence data “9” at the delay processing start timing (timing t2). At this time, the remaining delay time is 6 frames of audio data.

  In the case of FIG. 5A, first, the delay processing unit 109 time-stretches the silence data “9” using a fixed delay rate (300%). At this stage, the remaining delay time (for 6 frames of audio data) is not eliminated, and the continuous output time of silent data does not exceed the threshold th (for 6 frames of audio data). Therefore, the delay processing unit 109 time stretches the next silence data “10” using a fixed delay rate (300%). At this stage, the remaining delay time has not been eliminated, but the continuous output time of silent data has reached the threshold value th. The delay time eliminated by the time stretch so far is four frames of audio data. Therefore, the remaining delay time is two frames of audio data.

  Subsequently, the delay processing unit 109 time-stretches the sound data “11” using a fixed delay rate (200%). At this stage, the remaining delay time (for two frames of audio data) has not been eliminated. Therefore, subsequently, the delay processing unit 109 time stretches the next sound data “12” using a fixed delay rate (200%). As a result, the remaining delay time is eliminated, and the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast (timing t3).

  On the other hand, in the case of FIG. 5B, first, the delay processing unit 109 time-stretches the silence data “9” using a fixed delay rate (300%). At this stage, the remaining delay time (for 6 frames of audio data) is not eliminated, and the continuous output time of silent data does not exceed the threshold th (for 6 frames of audio data). Therefore, the delay processing unit 109 time stretches the next silence data “10” using a fixed delay rate (300%). At this stage, the remaining delay time has not been eliminated, but the continuous output time of silent data has reached the threshold value th. The delay time eliminated by the time stretch so far is four frames of audio data. Therefore, the remaining delay time is two frames of audio data.

  Here, if the next silence data “11” is time-stretched using a fixed delay rate (300%), the continuous output time of the silence data exceeds the threshold th. Therefore, the delay processing unit 109 does not output the silence data “11”, and uses the fixed delay rate (200%) to time stretch the first voice data “12” after the silence data “11”. To do. At this stage, the remaining delay time (for two frames of audio data) has not been eliminated. Therefore, subsequently, the delay processing unit 109 time-stretches the next sound data “13” using a fixed delay rate (200%). Even at this stage, the remaining delay time has not been eliminated. Therefore, subsequently, the delay processing unit 109 time stretches the next sound data “14” using a fixed delay rate (200%). As a result, the remaining delay time is eliminated, and the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast (timing t3).

  As described above, according to the broadcast receiving apparatus 10 of the first embodiment, in the delay process for DAB broadcast audio data, the ratio of the output time of the silent data to the entire output time of the audio data stretched by the delay process is While increasing, the proportion of the output time of the sound data decreases. For this reason, according to the broadcast receiving apparatus 10 of 1st Embodiment, the time when the audio | voice modulated by the delay process is output can be shortened.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a block diagram illustrating a functional configuration example of a broadcast receiving device 10 ′ according to the second embodiment of the present invention. The broadcast receiving apparatus 10 ′ shown in FIG. 6 is different from the broadcast receiving apparatus 10 of the first embodiment (see FIG. 1) in that a delay processing unit 109 ′ is provided instead of the delay processing unit 109.

  Regardless of the remaining delay time of the IP broadcast from the DAB broadcast, the delay processing unit 109 ′ outputs the output time after the time stretching of the silent data has a length that can eliminate the remaining delay time. Thus, the silent data is time-stretched. That is, in the second embodiment, when the time stretching of the silent data is performed, the length of the output time after the time stretching of the silent data is not limited by the threshold th.

[Example of processing by broadcast receiving apparatus 10 ']
FIG. 7 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. 7 is executed, for example, when the power of the broadcast receiving device 10 ′ is switched on.

  First, the DAB buffer 103 stores DAB broadcast audio data received by the first receiving unit 101 (step S702). Further, the IP buffer 106 stores the IP broadcast audio data received by the second receiving unit 104 (step S704). Then, the delay time calculation unit 107 calculates the delay time of the IP broadcast 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 S706). . Furthermore, the delay processing unit 109 ′ starts delay processing for DAB broadcast audio data according to the delay time calculated in step S 708 (step S 708).

  In this delay process, first, the silence data detection unit 108 extracts data having a predetermined length from the audio data to be subjected to the delay process (step S710). Then, the silence data detection unit 108 determines whether or not the data having the predetermined length extracted in step S710 is silence data (step S712). Here, when the silence data detection unit 108 determines that the predetermined length data is not the silence data (step S712: No), the delay processing unit 109 ′ uses the predetermined length data for the voice data. Is stretched at a fixed delay rate (step S720).

  Then, whether or not the remaining delay time (delay time calculated in step S706 in the case of sound data immediately after the start of the time stretch) has been eliminated by the time stretch of the sound data in step S720 by the delay processing unit 109 ′ Is determined (step S722). Here, when the delay processing unit 109 ′ determines that the remaining delay time has been eliminated (step S722: Yes), the delay processing unit 109 ′ ends the DAB broadcast delay processing (step S724), and the broadcast receiving apparatus 10 ′ ends the series of processing shown in FIG.

  On the other hand, when the delay processing unit 109 ′ determines that the remaining delay time has not been eliminated (step S <b> 722: No), the broadcast receiving device 10 ′ executes the processes after step S <b> 710 again.

  On the other hand, in step S712, when the silence data detection unit 108 determines that the data of the predetermined length is silence data (step S712: Yes), the delay time calculation unit 107 performs the delay processing before the delay processing unit 109 ′. The remaining delay time is calculated by subtracting the delay time eliminated by the delay processing by the delay processing unit 109 ′ from the calculated delay time (step S714). In addition, the silence data detection unit 108 specifies the length of the silence data (step S716). Then, the delay processing unit 109 'performs time stretching of the silence data by using a delay rate that is an output time that can eliminate the remaining delay time of the silence data (step S718). When the time stretching of the silent data ends, the delay processing unit 109 ′ ends the DAB broadcast delay process (step S <b> 724), and the broadcast receiving apparatus 10 ′ ends the series of processes shown in FIG. 7.

[Example of processing timing]
FIG. 8 is a diagram illustrating an example of processing timing by the broadcast receiving device 10 ′ according to the second embodiment of the present invention. FIG. 8A shows an example in which silence data for one frame of audio data is included at the head of the target data for delay processing. FIG. 8B shows an example in which silence data for two frames of audio data is included at the head of the target data for delay processing. 8A and 8B, the contents and reception timing of the audio data of the IP broadcast and DAB broadcast are the same as those in the first embodiment (FIG. 3), and thus the description thereof is omitted. However, in the example shown in FIGS. 8A and 8B, the IP broadcast is delayed by 8 frames of audio data from the DAB broadcast.

  In FIG. 8A and FIG. 8B, since the length of the silent data at the head of the target data of the delay processing is different, different delay rates of the silent data are applied. In FIGS. 8A and 8B, “None” is given to the silence data. Also, “sound” is attached to the sound data.

  For example, in the example shown in FIG. 8A, at the delay processing start timing (timing t2), the head audio data of the DAB broadcast is silence data “11”, and the next audio data is sound data “12”. It is. At this time, the remaining delay time is 8 frames of audio data.

  In this case, the delay processing unit 109 ′ time-stretches the silence data “11” so that the output time of the silence data “11” becomes an output time that can eliminate the remaining delay time. In the example shown in FIG. 8A, the remaining delay time can be eliminated by time-stretching the output time of the silence data “11” to 9 frames of audio data (that is, at a delay rate of 900%). . By this time stretching, the remaining delay time is eliminated, and the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast (timing t3).

  On the other hand, in the example shown in FIG. 8B, at the delay processing start timing (timing t2), the head audio data of the DAB broadcast is silence data “11”, and thereafter, silence data “12”, It continues with data "13". At this time, the remaining delay time is 8 frames of audio data.

  In this case, the delay processing unit 109 ′ causes the output time of the sound data α obtained by adding the silence data “11” and the silence data “12” to be an output time that can eliminate the remaining delay time. The audio data α is time stretched. In the example shown in FIG. 8B, the remaining delay time can be eliminated by time stretching the output time of the audio data α to 10 frames of the audio data (that is, with a delay rate of 500%). By this time stretching, the remaining delay time is eliminated, and the output timing of the DAB broadcast is synchronized with the output timing of the IP broadcast (timing t3).

  As described above, according to the broadcast receiving apparatus 10 ′ of the second embodiment, in the delay process for the DAB broadcast audio data, the silence data and the subsequent silence data are transmitted in the entire output time of the audio data extended by the delay process. Only the output time of occupies. That is, for example, when the head data is silence data, the output time of the silence data occupies the whole. For this reason, according to the broadcast receiving apparatus 10 ′ of the second embodiment, it is possible to shorten the time during which the sound modulated by the delay process is output.

  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. Further, FM broadcast may be applied as the first standard broadcast, and DAB 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. .

  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 apparatus 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 Silent data detecting unit 109, 109 'Delay processor 110 Output controller

Claims (6)

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;
In accordance with the delay time calculated by the delay time calculation unit, a delay process is performed on the audio data of the first standard broadcast, so that the output timing of the audio data of the first standard broadcast is set to the second standard. A broadcast receiving device including a delay processing unit synchronized with an output timing of audio data of a standard broadcast,
In the delay processing for the audio data of the first standard broadcast, the delay processing unit extends the output time of the data including the sound using a predetermined delay rate that is not zero, whereas the delay processing unit exceeds the delay rate of the data including the sound Use a high delay rate to extend the output time of data that does not contain audio ,
When extending the data output time,
A variable delay rate is used so that the data that does not include the sound after stretching has a length that can eliminate the delay time calculated by the delay time calculation unit. While extending the output time,
When the stretched data that does not include the voice is longer than a predetermined threshold, the output time of the data that does not include the voice is set using a variable delay rate so that the length is the same as the predetermined threshold. A broadcast receiver characterized by stretching . 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;
In accordance with the delay time calculated by the delay time calculation unit, a delay process is performed on the audio data of the first standard broadcast, so that the output timing of the audio data of the first standard broadcast is set to the second standard. A delay processing unit that synchronizes with the output timing of standard broadcast audio data;
A broadcast receiving apparatus comprising:
In the delay processing for the audio data of the first standard broadcast, the delay processing unit extends the output time of the data including the sound using a predetermined delay rate that is not zero, whereas the delay processing unit exceeds the delay rate of the data including the sound Use a high delay rate to extend the output time of data that does not contain audio,
When extending the data output time,
While the data that does not include the voice is stretched for a predetermined length using a fixed delay rate, the output time of the data that does not include the voice is extended.
If the continuous output time of the data that does not include the voice after stretching reaches a predetermined threshold by stretching the data that does not include the voice, the data including the voice after the data that does not include the voice is detected, A broadcast receiving apparatus characterized by extending the output time of data including detected sound . 3. 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. 4. The broadcast receiving apparatus according to claim 1 or 2 , wherein the broadcast of the first standard is FM broadcast, and the broadcast of the second standard is IP broadcast. An output control method by a broadcast receiving apparatus including an output control unit that selectively switches and outputs audio data of a first standard broadcast and audio data of a second standard broadcast delayed from the first standard broadcast. There,
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 apparatus performs a delay process on the audio data of the first standard broadcast according to the delay time calculated in the delay time calculation step, whereby the first standard broadcast And a delay processing step of synchronizing the output timing of the audio data with the output timing of the audio data of the second standard broadcast,
In the delay processing for the audio data of the first standard broadcast in the delay processing step, the delay processing unit extends the output time of the data including audio using a predetermined delay rate that is not zero, while the data including audio Using the delay rate higher than the delay rate, the output time of the data not including the voice is extended , and the data not including the voice after the extension is calculated by the delay time calculation unit when the output time of the data is extended. The output time of the data that does not include the voice is extended using a variable delay rate so that the delay time can be eliminated, while the data that does not include the voice after the extension is predetermined. Data that does not include the sound using a variable delay rate so as to be the same length as the predetermined threshold. Output control method, characterized in that the stretching output time. An output control method by a broadcast receiving apparatus including an output control unit that selectively switches and outputs audio data of a first standard broadcast and audio data of a second standard broadcast delayed from the first standard broadcast. There,
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 apparatus performs a delay process on the audio data of the first standard broadcast according to the delay time calculated in the delay time calculation step, whereby the first standard broadcast And a delay processing step of synchronizing the output timing of the audio data with the output timing of the audio data of the second standard broadcast,
In the delay processing for the audio data of the first standard broadcast in the delay processing step, the delay processing unit extends the output time of the data including audio using a predetermined delay rate that is not zero, while the data including audio Using a delay rate higher than the delay rate, the output time of the data that does not include sound is extended , and when the output time of the data is increased, the data not including the sound is fixed at a fixed delay rate for each predetermined length. When extending the output time of the data that does not include the voice, while extending the data that does not include the voice, the continuous output time of the data that does not include the voice after stretching reaches a predetermined threshold, by detecting the data including voice since data that does not include the sound, characterized in that the stretching output time data, including audio detected Force control method.

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