JP7035975B2 - Broadcast receiving device and broadcasting receiving method - Google Patents

Description

The present invention relates to a broadcast receiving device and a broadcast receiving method.

In Japanese terrestrial digital television broadcasting, one channel is divided into 13 segments, and high-quality full-segment broadcasting using 12 segments and one-segment broadcasting suitable for mobile reception using one segment can be used. .. Normally, one-segment broadcasting and full-segment broadcasting are simulcasts with the same broadcast content. In an in-vehicle television, the two may be appropriately switched and output according to the reception state of the television broadcast signal.

In simulcast, a plurality of broadcasts are not transmitted in synchronization, but one broadcast may be delayed with respect to the other broadcast. Therefore, when switching from a delayed broadcast to a non-delayed broadcast, the broadcast content is skipped by the amount of the delay. In order to prevent such skipping of broadcast contents, there is known a configuration in which the broadcast contents of the switching destination are accumulated by the delay amount when switching to a broadcast without delay, and the broadcast is switched after the accumulation is completed (for example, a patent). See Document 1).

Japanese Unexamined Patent Publication No. 2013-125986

The amount of delay in simulcast may differ for each broadcasting channel, and may also differ depending on the broadcasting station or relay station that outputs the broadcasting signal. Therefore, in order to switch the broadcast contents more appropriately, it is necessary to obtain an accurate delay amount for each broadcasting station. However, the received broadcast signal does not include information that directly indicates the delay amount, and it is not easy to obtain an appropriate delay amount from the received broadcast signal.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique for improving the correction accuracy of delay between simulcasts.

The broadcast receiving device of a certain aspect of the present invention has a demodulator that demolishes the received broadcast signal, a first broadcast on the demodulated signal, and broadcast with the same contents as the first broadcast and delayed from the first broadcast. A reproduction processing unit that reproduces a first video / audio signal corresponding to the first broadcast and a second video / audio signal corresponding to the second broadcast, and a first video / audio signal and a second broadcast when the second broadcast is included. A delay detection unit that calculates the delay amount of the second broadcast with respect to the first broadcast using the video / audio signal, an output unit that externally outputs either the first video / audio signal or the second video / audio signal, and the second video. When switching from the output of the audio signal to the output of the first video / audio signal, it includes a control unit that delays the output of the first video / audio signal according to the delay amount calculated by the delay detection unit. When the first video / audio signal obtained by delaying the first delay amount calculated in the past is externally output from the output unit, the delay detection unit delays the first delay amount of the first video / audio signal and the second video. The difference between the current delay amount of the second broadcast and the first delay amount with respect to the first broadcast is calculated using the audio signal, and the first delay amount and the candidate values of the plurality of differences calculated at different timings are used. The second delay amount of the second broadcast with respect to the broadcast is calculated. After satisfying the predetermined conditions, the control unit externally outputs the first video / audio signal with the second delay amount delayed from the output unit.

Another aspect of the present invention is a broadcast receiving method. This method includes a step of demolishing a received broadcast signal, a first broadcast in the demodulated signal, and a second broadcast having the same content as the first broadcast and being broadcast delayed from the first broadcast. In this case, the step of reproducing the first video / audio signal corresponding to the first broadcast and the second video / audio signal corresponding to the second broadcast, and the first broadcast using the first video / audio signal and the second video / audio signal. A step of calculating the delay amount of the second broadcast, a step of externally outputting either the first video / audio signal or the second video / audio signal, and the output of the second video / audio signal to the output of the first video / audio signal. When switching, a step of delaying the output of the first video / audio signal according to the calculated delay amount is provided. In this method, when the first video / audio signal in which the first delay amount calculated in the past is delayed is externally output, the first video / audio signal and the second video / audio signal in which the first delay amount is delayed are used. The difference between the current delay amount of the second broadcast and the first delay amount with respect to the first broadcast is calculated, and the second delay amount with respect to the first broadcast is calculated using the first delay amount and the candidate values of the plurality of differences calculated at different timings. The second delay amount of broadcasting is calculated, and after the predetermined condition is satisfied, the first video / audio signal with the second delay amount delayed is output to the outside.

It should be noted that any combination of the above components or components or expressions of the present invention that are mutually replaced between methods, devices, systems, etc. are also effective as aspects of the present invention.

According to the present invention, the accuracy of delay correction between simulcasts can be improved.

It is a block diagram which shows typically the functional composition of a broadcast receiving apparatus. It is a flowchart which shows the calculation method of the delay amount schematically. It is a flowchart which shows the switching method of a video-audio signal schematically. It is a figure which shows typically the calculation method of the difference of the delay amount.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The specific numerical values and the like shown in such embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present invention are not shown. do.

FIG. 1 is a block diagram schematically showing a functional configuration of the broadcast receiving device 10. Each functional block shown in the figure can be realized by an element or mechanical device such as a computer CPU or memory in terms of hardware, and by a computer program or the like in terms of software, but here, it is realized by their cooperation. It is drawn as a functional block to be realized. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by combining hardware and software.

The broadcast receiving device 10 is a device for receiving a digital television broadcast, and is an in-vehicle digital television receiving device used by being mounted on a moving body such as a vehicle. The broadcast content received by the broadcast receiving device 10 is reproduced through the display device 30 and the speaker 32. The user selects a channel to be viewed through the input device 34. If the reception sensitivity of the selected channel is good, the broadcast content of the specified channel is displayed or output.

The broadcast receiving device 10 is connected to the display device 30, the speaker 32, and the input device 34. The display device 30 is a liquid crystal display or the like, and is attached to the position of the center console or dashboard of the vehicle. The speaker 32 is an in-vehicle speaker, a speaker provided adjacent to the display device 30, and the like. The input device 34 is, for example, a touch panel type sensor, and is provided in the display area of the display device 30. The input device 34 is not a touch type, but may be composed of buttons or the like arranged around the display device 30.

The broadcast receiving device 10 includes a receiving unit 12, a demodulation unit 14, a reproduction processing unit 16, a delay detection unit 24, an output unit 26, and a control unit 28. The reproduction processing unit 16 includes a first processing unit 18, a second processing unit 20, and a buffer unit 22.

An antenna is connected to the receiving unit 12, and the broadcast signal of the channel selected through the antenna is received. The receiving unit 12 is configured to receive, for example, a terrestrial digital television broadcast signal. The receiving unit 12 may include only one tuner, or may include a plurality of tuners. When the receiving unit 12 includes a plurality of tuners, each tuner may receive broadcast signals of different channels, or each tuner receives broadcast signals of the same channel, so that a so-called diversity receiving method is realized. You may.

The demodulation unit 14 demodulates the broadcast signal received by the reception unit 12. The demodulation unit 14 is configured to generate a transport stream (TS) signal from, for example, a received terrestrial digital television broadcast signal. When the receiving unit 12 includes a plurality of tuners, the demodulating unit 14 may be configured to demodulate a plurality of TS signals based on the broadcast signals of different channels received by each tuner. The demodulation unit 14 may be configured to synthesize the broadcast signals of the same channel received by each tuner and demodulate the TS signal by a so-called diversity reception method.

The reproduction processing unit 16 reproduces a video / audio signal from the TS signal generated by the demodulation unit 14. The reproduction processing unit 16 generates, for example, a video / audio signal for terrestrial digital television broadcasting from a TS signal. When the TS signal includes a plurality of broadcast contents simulcast, the reproduction processing unit 16 generates a video / audio signal corresponding to each broadcast. For example, when the TS signal includes a full-segment broadcast as the first broadcast and a one-segment broadcast as the second broadcast, the video and audio signals of the full-segment broadcast and the one-segment broadcast are reproduced.

Here, full-segment broadcasting refers to high-quality broadcasting content using 12 segments out of 13 segments included in one channel of Japanese terrestrial digital television broadcasting. On the other hand, one-segment broadcasting refers to broadcasting content suitable for mobile reception using one of the above 13 segments. Full-segment broadcasting and one-segment broadcasting are broadcasts that are set in one channel and have different layers. Normally, one-segment broadcasting and full-segment broadcasting are simul broadcasting with the same broadcasting content, and a broadcasting signal in which the one-segment broadcasting content is delayed with respect to the full-segment broadcasting content is transmitted from the broadcasting station.

The first processing unit 18 reproduces a first video / audio signal corresponding to the first broadcast, which is one of the simulcasts. The second processing unit 20 reproduces a second video / audio signal corresponding to the second broadcast, which is the other side of the simulcast. For example, the first processing unit 18 generates a video / audio signal for full-segment broadcasting, and the second processing unit 20 generates a video / audio signal for one-segment broadcasting. The buffer unit 22 temporarily holds the video / audio signal generated by the first processing unit 18 and the second processing unit 20.

The delay detection unit 24 detects the amount of delay between the first broadcast and the second broadcast, which are simulcasts. The delay detection unit 24 detects, for example, the amount of delay in one-segment broadcasting with respect to the preceding full-segment broadcasting. The delay detection unit 24 compares the first video / audio signal and the second video / audio signal, and more specifically, compares the waveforms of both audio signals to calculate the delay amount. The delay detection unit 24 calculates the delay amount from the difference in the time position of the peak waveform included in the audio signal within a certain period of time. For example, if the time position of the peak waveform of the first audio signal of the first broadcast and the time position of the peak waveform of the second audio signal of the second broadcast deviate by Δt, the time of Δt is calculated as the delay amount. do.

The delay detection unit 24 holds a plurality of calculated delay amounts as candidate values. The delay detection unit 24 periodically calculates a candidate value for the delay amount, and holds a plurality of the delay amounts calculated in the past. The delay detection unit 24 determines the final delay amount to be applied to the correction process from the candidate values of the plurality of delay amounts to be held. The delay detection unit 24 determines, for example, any one of the arithmetic mean value, the median value, and the mode value of the plurality of candidate values as the final delay amount. By determining the final delay amount from a plurality of candidate values, the calculation accuracy can be improved as compared with the case where only one of the candidate values is used.

The delay detection unit 24 may hold a predetermined number of candidate values for each channel or each broadcasting station as candidate values for the delay amount. The upper limit of the number of candidate values to be held is about 3 to 20, for example, about 4 to 10. When the delay detection unit 24 calculates a candidate value for a new delay amount when the candidate values are held up to the upper limit number, the delay detection unit 24 selects a more appropriate candidate value from the held candidate values and the new candidate values. Select and retain up to the maximum number, and delete the candidate values that were not selected. For example, if the upper limit is 5, select an appropriate 5 from a total of 6 of the 5 candidate values held and 1 new candidate value, and 1 that is considered inappropriate. Exclude candidate values. At this time, the candidate value to be excluded is a value far from any of the arithmetic mean value, the median value, and the mode value of the plurality of candidate values. By excluding candidate values that deviate from the values that are considered to be more appropriate, the accuracy of detecting the delay amount can be further improved.

The delay detection unit 24 may be configured to keep the candidate values to be held without erasing them even when the power of the broadcast receiving device 10 is turned off. For example, when the broadcast receiving device 10 has a non-volatile memory unit such as a hard disk or a flash memory, a candidate value for the delay amount may be held in the memory unit. As a result, the delay amount can be calculated based on the candidate values calculated in the past even immediately after the power of the broadcast receiving device 10 is turned on.

The delay detection unit 24 may calculate the delay amount only when a predetermined condition is satisfied. The delay detection unit 24 may calculate the delay amount only when a broadcast signal having a sufficient signal strength can be received. For example, the delay detection unit 24 can suitably decode both full-segment broadcasting and one-segment broadcasting video / audio signals from the TS signal. The delay amount may be calculated only in the case. The delay detection unit 24 may calculate the delay amount only when the first audio signal and the second audio signal include a peak waveform exceeding the reference value. By calculating the delay amount in such a situation where the detection accuracy of the delay amount is considered to be high, the detection accuracy of the delay amount can be further improved.

The output unit 26 externally outputs the video / audio signal generated by the reproduction processing unit 16, causes the display device 30 to display the video, and outputs the audio from the speaker 32. The output unit 26 causes either one of the first video / audio signal and the second video / audio signal generated by the reproduction processing unit 16 to be externally output based on the instruction from the control unit 28.

The control unit 28 controls the video / audio signal to be output to the output unit 26 according to the reception status of the broadcast signal. The control unit 28 makes it possible to output a higher quality first video / audio signal to the outside when the reception condition of the broadcast signal is good. The control unit 28 makes it possible to output a more stable second video / audio signal to the outside when the reception status of the broadcast signal is poor and the first video / audio signal cannot be stably reproduced. When the broadcast signal cannot be properly received and the second video / audio signal cannot be stably reproduced, the control unit 28 makes a display notifying that the signal cannot be received.

When the reception condition is improved during the output of the second video / audio signal and the control unit 28 switches to the output of the first video / audio signal, the control unit 28 outputs the first video / audio signal according to the delay amount calculated by the delay detection unit 24. To delay. The control unit 28 causes the buffer unit 22 to temporarily hold the first video / audio signal so that the first video / audio signal is output with a delay by the delay amount calculated by the delay detection unit 24. As a result, the output timing of the first video / audio signal can be synchronized with the output timing of the second video / audio signal that is relatively delayed, and the video / audio signal is switched so that the video and audio do not skip. be able to.

When the reception condition deteriorates during the output of the first video / audio signal and the control unit 28 switches to the output of the second video / audio signal, the control unit 28 outputs the second video / audio signal without delay. At this time, if the first video / audio signal is delayed and output before switching, the video / audio signal can be seamlessly switched by immediately switching from the first video / audio signal to the second video / audio signal. can. On the other hand, if the first video / audio signal is delayed and not output before switching, the output of the second video / audio signal may be started after waiting for the delay amount calculated by the delay detection unit 24. .. That is, the output of both the first video / audio signal and the second video / audio signal may be temporarily stopped for a delay amount time. This makes it possible to prevent the content of the first broadcast immediately before switching and the content of the second broadcast immediately after switching from being output in duplicate.

FIG. 2 is a flowchart schematically showing a method of calculating the delay amount. First, if the first audio-video signal can be reproduced from the demodulated signal (Y in S10) and the first audio-video signal contains a peak waveform equal to or greater than the reference value (Y in S12), the first A candidate value for the delay amount is calculated by comparing the peak waveforms of the audio-video signal and the second audio-video signal (S14). If a predetermined number of candidate values are retained (Y in S16), an appropriate candidate value is selected and updated from the previously calculated candidate values and the newly calculated candidate values that are retained (S18). The delay amount is calculated from the candidate values to be held (S20). If a predetermined number of candidate values are not held (N in S16), the newly calculated candidate values are held (S22), and the delay amount is calculated from the held candidate values (S20). When the first audio-video signal is not reproducible (N in S10) or when a peak waveform equal to or greater than the reference value is not included (N in S12), the processes of S14 to S20 are skipped. The processes of S10 to S20 are repeatedly executed.

FIG. 3 is a flowchart schematically showing a method of switching video and audio signals. When switching from the delayed second broadcast to the first broadcast without delay (Y in S30), the output of the first video / audio signal is started by delaying by the delay amount calculated by the delay detection unit 24 (S32). When switching from the first broadcast to the second broadcast (Y in S34) instead of switching from the second broadcast to the first broadcast (N in S30), if there is no output delay for the first video / audio signal before switching (S36). Y), the delay amount calculated by the delay detection unit 24 is waited (S38), and then the output of the second video / audio signal is started without delay (S40). On the other hand, if there is an output delay with respect to the first video / audio signal before switching (N in S36), the processing of S38 is skipped and the output of the second video / audio signal is started without delay (S40). If the switch is not from the first broadcast to the second broadcast (N in S34), the subsequent processing is skipped.

According to the present embodiment, by determining the delay amount between the first broadcast and the second broadcast, which are simulcasts, based on the calculation results of a plurality of times, the delay amount is larger than that based on the calculation result of one time. The calculation accuracy of can be improved. As a result, more appropriate delay processing can be performed when switching from the second broadcast to the first broadcast, and the accuracy of delay correction between simulcasts can be improved.

When the first video / audio signal delayed by the delay amount calculated in the past (also referred to as the first delay amount) is externally output, the delay detection unit 24 sets the current delay amount of the second broadcast with respect to the first broadcast. By calculating the difference of the first delay amount, the accuracy of the delay correction may be further improved. When the first video / audio signal delayed by the first delay amount is externally output, the first video / audio signal delayed for external output is simply compared with the undelayed second video / audio signal. Then, the difference between the current delay amount and the first delay amount can be calculated. In this case, since it is not necessary to separately generate an undelayed first video / audio signal in order to directly calculate the current delay amount of the second broadcast with respect to the first broadcast, the processing load of the broadcast receiving device 10 is increased. It can be reduced. In addition, it is possible to prevent an increase in the memory capacity for temporarily storing a plurality of first video / audio signals having different delay amounts.

FIG. 4 is a diagram schematically showing a method of calculating the difference in the delay amount, and shows the video / audio signals 40, 42, 44 that are reproduced or output externally. This figure shows the audio content of "Good morning. Morning news." In simulcast, and detects the timing of the audio signal based on the peak waveform corresponding to the "O" sound of the audio signal. .. The video / audio signal 40 in the upper row indicates a first video / audio signal when the first broadcast is reproduced as it is without delay. The video / audio signal 42 in the middle stage indicates a first video / audio signal that is externally output by delaying the first broadcast based on the first delay amount calculated in the past. The lower video / audio signal 44 indicates a second video / audio signal when the second broadcast is reproduced as it is without delay.

In FIG. 4, the current delay amount (second delay amount) of the second broadcast with respect to the first broadcast and the first delay amount calculated in the past are different, and there is a difference in the delay amount between the two. Is shown. Since the difference in the delay amount corresponds to the delay amount between the first video / audio signal 42 for external output and the second video / audio signal 44 in which the first delay amount is delayed, it is calculated by comparing the two. can. The current delay amount can be calculated from the "first delay amount" and the "difference in delay amount".

Similar to the method for calculating the delay amount described above, the delay detection unit 24 periodically calculates the candidate value of the difference between the current delay amount and the first delay amount, and holds a plurality of the calculated difference candidate values. The delay detection unit 24 determines the final difference to be applied to the correction process from the candidate values of the plurality of differences to be held, and adds the final difference and the first delay amount to be used for the next delay correction. The delay amount (second delay amount) for this is calculated. By determining the final delay amount from a plurality of candidate values, the calculation accuracy can be improved as compared with the case where only one of the candidate values is used. In order to calculate the second delay amount, it is sufficient to hold the first delay amount used for the external output and the candidate values of a plurality of differences, so that the memory capacity of the delay detection unit 24 is increased. Can be suppressed.

The difference in the amount of delay calculated by the delay detection unit 24 can take a positive value or a negative value. When the difference in the delay amount is a positive value, it means that the current delay amount is larger than the first delay amount. On the other hand, when the difference in the delay amount is a negative value, it means that the current delay amount is smaller than the first delay amount.

The delay detection unit 24 may make the calculation accuracy of the candidate value of the difference of the delay amount higher than the calculation accuracy of the candidate value of the first delay amount. For example, when the calculation accuracy of the delay amount of the delay detection unit 24 is a fixed number of digits (for example, 16 bits), the calculation may be performed with double precision by shifting the position of the decimal point. If the first delay amount is calculated accurately, the candidate value of the difference of the delay amount is 1/4 or less or 1/8 or less of the first delay amount. The delay amount can be calculated with high accuracy using the number.

When the second delay amount is calculated, the control unit 28 externally outputs the first video / audio signal in which the second delay amount is delayed after the predetermined condition is satisfied. The control unit 28 reflects, for example, the second delay amount at the next switching from the output of the second video / audio signal to the output of the first video / audio signal, and delays the second delay amount of the first video / audio signal. Output to the outside. When calculating the second delay amount, since the first video / audio signal with the first delay amount delayed is externally output, the first broadcast is then switched to the second broadcast, and then the second broadcast to the first broadcast. When switched to, the first broadcast reflecting the second delay amount is output to the outside. Not only when the first broadcast is directly switched to the second broadcast, but also the first broadcast of a specific channel is switched to another channel, and then the second broadcast of a specific channel is switched to, and further specific. Even when the channel is switched from the second broadcast to the first broadcast, the first broadcast reflecting the second delay amount is output to the outside.

When the second delay amount is calculated, the control unit 28 may reflect the second delay amount in the currently output first broadcast, not at the next switching from the second broadcast to the first broadcast. .. For example, the delay amount of the first video / audio signal in which the first delay amount is delayed may be gradually changed so that the delay amount gradually changes from the first delay amount to the second delay amount with the passage of time. .. In this way, the first video / audio signal with the second delay amount delayed is externally output after a predetermined time (for example, 1 minute, 5 minutes, 10 minutes, 15 minutes, 30 minutes) required for adjusting the delay amount. You may do so.

Although the present invention has been described above with reference to the above-described embodiment, the present invention is not limited to the above-described embodiment, and the present invention is not limited to the above-described embodiment, and the configuration shown in each display example is appropriately combined or replaced. Is also included in the present invention.

In the above-described embodiment, the broadcast receiving device 10 for receiving the terrestrial digital television broadcast has been described. In the modified example, the above-mentioned contents may be applied to a broadcast receiving device for receiving a broadcast other than terrestrial digital television broadcasting.

10 ... Broadcast receiving device, 12 ... Receiving unit, 14 ... Demodulation unit, 16 ... Playback processing unit, 24 ... Delay detection unit, 26 ... Output unit, 28 ... Control unit, 30 ... Display device, 32 ... Speaker, 34 ... Input Device.

Claims (9)

A demodulator that demodulates the received broadcast signal,
When the demodulated signal includes a first broadcast and a second broadcast having the same content as the first broadcast and being broadcast delayed from the first broadcast, the first broadcast corresponding to the first broadcast is included. A playback processing unit that reproduces the video / audio signal and the second video / audio signal corresponding to the second broadcast, and
A delay detection unit that calculates the delay amount of the second broadcast with respect to the first broadcast using the first video / audio signal and the second video / audio signal.
An output unit that externally outputs either the first video / audio signal or the second video / audio signal,
When switching from the output of the second video / audio signal to the output of the first video / audio signal, a control unit for delaying the output of the first video / audio signal according to the delay amount calculated by the delay detection unit is provided. ,
When the first video / audio signal obtained by delaying the first delay amount calculated in the past is externally output from the output unit, the delay detection unit may delay the first video / audio signal and the first video / audio signal. Using the second video / audio signal, the difference between the current delay amount of the second broadcast and the first delay amount with respect to the first broadcast is calculated, and the first delay amount and a plurality of differences calculated at different timings. The second delay amount of the second broadcast with respect to the first broadcast is calculated using the candidate value of.
The control unit is a broadcast receiving device, characterized in that, after satisfying a predetermined condition, a first video / audio signal with a delayed second delay amount is externally output from the output unit. When the undelayed first video / audio signal is externally output from the output unit, the delay detection unit calculates the first delay amount using the candidate values of a plurality of delay amounts calculated at different timings. The broadcast receiving device according to claim 1. The delay detection unit holds a candidate value for one or more differences between the first delay amount and the second delay amount, and is between the newly calculated first delay amount and the second delay amount. The second delay amount is calculated by using the candidate value of the difference between the above and the candidate value of one or more differences between the first delay amount and the second delay amount to be held. The broadcast receiving device according to 1 or 2. When the control unit switches from the external output of the second video / audio signal to the external output of the first video / audio signal after calculating the second delay amount, the control unit delays the second delay amount of the first video / audio signal. The broadcast receiving device according to any one of claims 1 to 3, wherein the output is externally output from the output unit. When the external output of the first video / audio signal delayed by the first delay amount continues after the calculation of the second delay amount, the control unit externally outputs the first video / audio signal from the output unit. Any one of claims 1 to 3, wherein the delay amount of the above is changed stepwise, and the first video / audio signal in which the second delay amount is delayed is externally output from the output unit after a predetermined time. Broadcast receiver described in. The delay detection unit holds a candidate value for the first delay amount or a candidate value for a difference between the first delay amount and the second delay amount for each broadcasting station of the received broadcast signal, and for each broadcasting station. The broadcast receiving device according to any one of claims 1 to 5, wherein the first delay amount and the second delay amount are calculated. The broadcast reception according to any one of claims 1 to 6, wherein the delay detection unit calculates the delay amount by comparing the waveforms of the audio signals of the first broadcast and the second broadcast. Device. The step of demodulating the received broadcast signal and
When the demodulated signal includes a first broadcast and a second broadcast having the same content as the first broadcast and being broadcast delayed from the first broadcast, the first broadcast corresponding to the first broadcast is included. A step of reproducing the video / audio signal and the second video / audio signal corresponding to the second broadcast, and
A step of calculating the delay amount of the second broadcast with respect to the first broadcast using the first video / audio signal and the second video / audio signal, and
A step of externally outputting either the first video / audio signal or the second video / audio signal,
When switching from the output of the second video / audio signal to the output of the first video / audio signal, a step of delaying the output of the first video / audio signal according to the calculated delay amount is provided.
When the first video / audio signal in which the first delay amount calculated in the past is delayed is externally output, the first video / audio signal in which the first delay amount is delayed and the second video / audio signal are used. The difference between the current delay amount of the second broadcast and the first delay amount with respect to the first broadcast is calculated, and the first broadcast using the first delay amount and the candidate values of a plurality of differences calculated at different timings. A broadcast receiving method, characterized in that a second delay amount of the second broadcast is calculated with respect to the above, and after a predetermined condition is satisfied, a first video / audio signal with the second delay amount delayed is externally output. The function to demodulate the received broadcast signal and
When the demodulated signal includes a first broadcast and a second broadcast having the same content as the first broadcast and being broadcast delayed from the first broadcast, the first broadcast corresponding to the first broadcast is included. A function to reproduce the video / audio signal and the second video / audio signal corresponding to the second broadcast, and
It is a function of calculating the delay amount of the second broadcast with respect to the first broadcast using the first video / audio signal and the second video / audio signal, and uses candidate values of a plurality of delay amounts calculated at different timings. And the function to calculate the delay amount
A function to externally output either the first video / audio signal or the second video / audio signal, and
When the first video / audio signal in which the first delay amount calculated in the past is delayed is externally output, the first video / audio signal in which the first delay amount is delayed and the second video / audio signal are used. The difference between the current delay amount of the second broadcast and the first delay amount with respect to the first broadcast is calculated, and the first broadcast using the first delay amount and the candidate values of a plurality of differences calculated at different timings. And the function to calculate the second delay amount of the second broadcast for
A program characterized in that a computer realizes a function of externally outputting a first video / audio signal in which the second delay amount is delayed after satisfying a predetermined condition.

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