JP2024004728A - Broadcast reception device and broadcast playback method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast reception device capable of correcting a temporal shift in audio data between broadcast waves even when two broadcast waves being received include an analog radio broadcast.

SOLUTION: In a broadcast reception device 10, when selected audio data selected as an output target out of first audio data demodulated from a first broadcast wave and second audio data demodulated from a second broadcast wave is antecedent to non-selected audio data which is not selected as the output target, a silent section expansion unit 7 corrects a temporal shift of the selected audio data with respect to the non-selected audio data by expanding the silent section of the selected audio data. The silent section detection unit 6 detects, as a silent section, a section in which the instantaneous level of the selected audio data continues to be lower than a predetermined threshold value for a certain length or more, and when the selected audio data is audio data of analog radio broadcasting, the lower the reception quality of the selected audio data is, the larger the threshold value is.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a broadcast receiving device and a broadcast reproducing method, and particularly relates to a technique for switching between multiple broadcasts with the same content according to reception quality.

In addition to AM and FM analog radio broadcasting, there are various broadcasting methods such as European digital radio broadcasting DAB (Digital Audio Broadcast) and Indian digital radio broadcasting DRM (Digital Radio Mondiale). There are broadcast receiving devices that can receive broadcast waves. Furthermore, the same content may be broadcast by two broadcast waves using different systems.

In an area where two broadcast waves with the same content can be received, it is desirable that the broadcast wave with higher reception quality is reproduced. In particular, broadcast receiving devices installed in in-vehicle devices such as car navigation systems, and portable broadcast receiving devices including mobile phones and smartphones receive broadcast waves while moving, so the reception quality of each broadcast wave is It would be highly convenient to evaluate in real time and automatically select and play broadcast waves with higher reception quality. The function of linking two broadcast waves with the same content and switching the broadcast wave to be reproduced according to the reception quality of each broadcast wave in this way is called a "link function."

However, there is a time lag in audio data between broadcast waves of different formats, such as digital radio and analog radio, and if you switch broadcast waves without taking this time lag into account, the reproduced audio will be discontinuous. , giving the user a sense of discomfort. Therefore, a "seamless link function" that corrects the time difference between broadcast waves and seamlessly switches between two broadcast waves is desired.

As a technology for realizing the seamless link function, for example, as disclosed in Patent Document 1 below, by slowing down the playback speed of the one of the two broadcast waves in which the audio data precedes the audio data, A technique for correcting the deviation has been disclosed. Further, Patent Document 2 listed below discloses a technique for correcting a temporal shift in audio data by extending a silent section of the preceding audio data.

Patent No. 6370482 JP 2017-147623 Publication

In the technique of Patent Document 1, slowing down the playback speed may give the user a sense of discomfort. In the technology of Patent Document 2, when analog radio broadcasting is being received, if the reception quality becomes low, it becomes difficult to detect silent sections due to the influence of noise, making it impossible to correct the temporal deviation of audio data. .

The present disclosure has been made to solve the above-mentioned problems, and even when the two broadcast waves being received include analog radio broadcasts, the temporal difference in audio data between the two broadcast waves is It is an object of the present invention to provide a broadcast receiving device and a broadcast reproducing method that can correct deviations.

A broadcast receiving device according to the present disclosure includes a first demodulation unit that demodulates first audio data from a first broadcast wave, and a second demodulator that demodulates first audio data from a second broadcast wave that broadcasts the same content as the first broadcast wave. a second demodulator that demodulates data; a first buffer memory that stores first audio data; a second buffer memory that stores second audio data; 1 reception quality evaluation section; a second reception quality evaluation section that evaluates the reception quality of the second audio data; and an audio deviation amount that estimates the amount of time deviation between the first audio data and the second audio data. an estimating unit; and an output audio selection unit that selects either the first audio data or the second audio data as an output target based on the reception quality of the first audio data and the reception quality of the second audio data. , among the first audio data and the second audio data, the selected audio data that is selected as an output target precedes the non-selected audio data that is not selected as an output target. If the selected audio data precedes the non-selected audio data, the silent section detecting section detects the silent section of the selected audio data, and if the selected audio data precedes the non-selected audio data, the silent section of the selected audio data is extended and the selected audio data is converted to the selected audio data. A silent section extension unit that corrects the temporal deviation of the selected audio data with respect to the non-selected audio data by delaying the selected audio data by a length corresponding to the amount of deviation, and reproduces and outputs the selected audio data with the temporal deviation corrected. an audio output section, the silent section detecting section detects as a silent section a section in which a state in which the instantaneous level of the selected audio data is lower than a predetermined threshold continues for a certain length or more, and detects that the selected audio data is analog radio broadcasting. If the selected audio data is audio data, the silent section detection unit increases the threshold value as the reception quality of the selected audio data is lower.

According to the broadcast receiving device according to the present disclosure, even when two broadcast waves being received include an analog radio broadcast, the time difference in audio data between the two broadcast waves is corrected, and the two broadcast waves are corrected. This makes it possible to seamlessly switch between two broadcast waves.

1 is a block diagram showing the configuration of a broadcast receiving device according to Embodiment 1. FIG. FIG. 3 is a diagram for explaining an operation in which a silent interval detection unit searches for a silent interval from audio data of an analog radio broadcast. FIG. 3 is a diagram for explaining operations of a silent section detection section and a silent section expansion section. 3 is a flowchart showing the operation of the broadcast receiving device according to the first embodiment. It is a diagram showing an example of the hardware configuration of a broadcast receiving device. It is a diagram showing an example of the hardware configuration of a broadcast receiving device.

<Embodiment 1>
FIG. 1 is a block diagram showing the configuration of a broadcast receiving apparatus 10 according to the first embodiment. The broadcast receiving device 10 is a device that can receive broadcast waves while moving, such as a broadcast receiving device installed in an in-vehicle device such as a car navigation system, or a portable broadcast receiving device including a mobile phone or a smartphone. do.

As shown in FIG. 1, the broadcast receiving apparatus 10 includes a first demodulator 11, a second demodulator 12, a first buffer memory 21, a second buffer memory 22, a first reception quality evaluation section 31, a second reception quality evaluation 32, an audio deviation amount estimation section 4, an output audio selection section 5, a silent section detection section 6, a silent section expansion section 7, and an audio output section 8.

The first demodulator 11 and the second demodulator 12 convert broadcast waves received by the antenna into audio data. Here, the broadcast receiving device 10 can receive a first broadcast wave and a second broadcast wave that broadcast the same content, and the first broadcast wave and the second broadcast wave have different broadcasting methods. Suppose there is. As the first broadcast wave and the second broadcast wave, analog radio broadcast, DAB, DRM, IP (Internet Protocol) broadcast (for example, Internet radio), etc. can be considered.

The first demodulator 11 demodulates audio data from the first broadcast wave, and the second demodulator 12 demodulates audio data from the second broadcast wave. Hereinafter, the audio data demodulated from the first broadcast wave will be referred to as "first audio data", and the audio data demodulated from the second broadcast wave will be referred to as "second audio data". Note that the demodulation method performed by the first demodulation section 11 and the second demodulation section 12 differs depending on the broadcasting method of the first broadcast wave and the second broadcast wave. For example, if the first broadcast wave is an FM broadcast wave and the second broadcast wave is a DAB broadcast wave, the first demodulator 11 performs FM demodulation, and the second demodulator 12 performs DAB demodulation. conduct.

The first buffer memory 21 temporarily stores (buffers) the first audio data demodulated by the first demodulator 11. The second buffer memory 22 temporarily stores the second audio data demodulated by the second demodulator 12.

The first reception quality evaluation unit 31 acquires parameters related to the reception quality of the first broadcast wave from the first demodulation unit 11, and evaluates the reception quality of the first audio data based on the parameters. The second reception quality evaluation section 32 acquires parameters related to the reception quality of the second broadcast wave from the second demodulation section 12, and evaluates the reception quality of the second audio data based on the parameters. Parameters related to reception quality include received power level, SN ratio (Signal to Noise ratio), DAB C/N ratio (Carrier to Noise ratio), FM broadcast stereo pilot carrier level, etc. It can be anything.

The audio deviation amount estimating unit 4 calculates the correlation between the first audio data stored in the first buffer memory 21 and the second audio data stored in the second buffer memory 22. It is determined which of the audio data and the second audio data precedes the audio data, and the amount of time shift between the first audio data and the second audio data is estimated.

The output audio selection unit 5 selects the first audio data based on the reception quality of the first audio data evaluated by the first reception quality evaluation unit 31 and the reception quality of the second audio data evaluated by the second reception quality evaluation unit 32. or the second audio data to be output. Hereinafter, of the first audio data and the second audio data, the one selected as the output target by the output audio selection unit 5 will be referred to as "selected audio data", and the one that is not selected as the output target will be referred to as "non-selected audio data". "selected audio data". Furthermore, in the link function, the unselected audio data is linked to the audio data that is being output (that is, the selected audio data), so the unselected audio data is sometimes referred to as "link destination audio data."

The silent section detection unit 6 detects a silent section of the selected audio data when the selected audio data precedes the non-selected audio data in the first audio data and the second audio data. Specifically, the silent section detection unit 6 detects, as a silent section, a section in which the instantaneous level of the selected audio data remains lower than a predetermined threshold for a certain length of time or more.

In analog radio broadcasting, the reception quality of broadcast waves affects the waveform of audio data obtained by demodulating them. In other words, when the reception quality is high, the noise superimposed on the audio data in the silent section is small, as shown in Figure 2(a), but when the reception quality is low, the noise superimposed on the audio data in the silent interval is small, as shown in Figure 2(b). Loud noise is superimposed. Therefore, if the threshold value for detecting silent sections is fixed, it becomes difficult to distinguish between silent sections and other sections when the reception quality of broadcast waves is low, and silent sections cannot be detected correctly. Therefore, when the selected audio data is analog radio broadcasting audio data, the silent section detection unit 6 changes the above threshold value according to the reception quality of the selected audio data, and when the reception quality of the selected audio data is low, Increase the threshold value accordingly. That is, when the reception quality is high, the threshold value is made small as shown in FIG. 2(a), and when the reception quality is low, the threshold value is made large as shown in FIG. 2(b). This makes it possible for the silent section detection section 6 to correctly detect silent sections even when the reception quality is low.

When the selected audio data precedes the non-selected audio data, the silent section extension section 7 extends the silent section of the selected audio data detected by the silent section detection section 6, and adjusts the selected audio data to the above-mentioned deviation. By delaying the selected audio data by a length corresponding to the amount, the time difference between the selected audio data and the non-selected audio data is corrected.

FIG. 3 shows a specific example of the operation of the silent section detecting section 6 and the silent section expanding section 7. In the example of FIG. 3, it is assumed that the audio data being output (selected audio data) precedes the linked audio data (non-selected audio data). In order to seamlessly switch from the audio data being output to the linked audio data, it is necessary to correct the time lag between the audio data currently being output and the linked audio data to eliminate the lag between the two. In order to achieve this, the silent section detecting section 6 searches for a silent section of the audio data that is being output, and the silent section expanding section 7 expands the silent section detected by the silent section detecting section 6. Delays the audio data inside. In this embodiment, the silent section is extended by inserting a new silent section (hereinafter referred to as "additional silent section") into the original silent section.

At this time, the silent section expanding unit 7 extends the audio data being output by a length corresponding to the time difference between the first audio data and the second audio data estimated by the audio deviation amount estimating unit 4. By extending the silent section, it is possible to eliminate the discrepancy between the audio data being output and the audio data at the link destination. However, if the length by which the silent period extension unit 7 extends the silent period at one time (that is, the length of the additional silent period) is long, an unnaturally long silent period may occur, which may give the user a sense of discomfort. Therefore, as shown in FIG. 3, the silent section extension unit 7 repeatedly stretches the silent section of the audio data that is being output by a predetermined small length, so that the audio data that is being output and the link destination are The amount of deviation from the audio data is gradually reduced, and finally the amount of deviation is reduced to zero.

The audio output unit 8 reproduces the corrected selected audio data and outputs audio corresponding to the selected audio data from a speaker or the like.

FIG. 4 is a flowchart showing the operation of broadcast receiving apparatus 10 according to the first embodiment. The operation of the broadcast receiving apparatus 10 will be described below with reference to FIG. 4.

When the broadcast receiving apparatus 10 is started, first, the first demodulating section 11 and the second demodulating section 12 demodulate audio data from the first broadcast wave and the second broadcast wave, respectively (step S101). The first audio data demodulated by the first demodulator 11 is stored in the first buffer memory 21, and the second audio data demodulated by the second demodulator 12 is stored in the second buffer memory 22 (step S102).

Further, the first reception quality evaluation unit 31 and the second reception quality evaluation unit 32 evaluate the reception quality of the first audio data and the second audio data, respectively (step S103). At this time, if it is not selected whether to output the first audio data or the second audio data (NO in step S104), the output audio selection unit 5 selects the one with higher reception quality among them. It is selected as an output target (step S105). If audio data to be output has already been selected (YES in step S104), that selection is maintained.

Next, the audio deviation amount estimating unit 4 performs a correlation calculation between the first audio data stored in the first buffer memory 21 and the second audio data stored in the second buffer memory 22. , it is determined which of the first audio data and the second audio data precedes the other, and the amount of time shift between the first audio data and the second audio data is estimated (step S106).

If the selected audio data precedes the non-selected audio data (YES in step S107), the silent section detection unit 6 searches for a silent section of the selected audio data (step S108). If a silent section is detected at this time (YES in step S109), the silent section extension section 7 delays the selected audio data by extending the silent section (step S110). Then, the audio output unit 8 reproduces the delayed selected audio data, and audio corresponding to the selected audio data is output from a speaker or the like (step S111).

On the other hand, if the amount of deviation between the selected audio data and the non-selected audio data is 0, or if the non-selected audio data precedes the selected audio data (NO in step S107), the output audio selection unit 5 selects the selected audio data. Based on the reception quality of the data and non-selected audio data, it is determined whether or not to switch audio data to be output. Specifically, the reception quality of the selected audio data is less than or equal to a predetermined threshold (YES in step S112), and the reception quality of the non-selected audio data (link destination audio data) is lower than the reception quality of the selected audio data. If the quality is higher than the quality (YES in step S113), the output audio selection unit 5 switches the audio data to be output to the linked audio data (step S114). In other cases (NO in step S112 or NO in step S113), the current selection is maintained. Then, the audio output unit 8 reproduces the selected audio data, and audio corresponding to the selected audio data is output from a speaker or the like (step S111).

Note that if the non-selected audio data precedes the selected audio data, there is a time lag between them, but in step S114, the unselected audio data is stored in the first buffer memory 21 or the second buffer memory 22 Seamless switching of audio data is possible by retracing the reading start position of the audio data of the linked destination by the amount of shift. Therefore, in that case, there is no need to correct the temporal shift in advance.

After step S111, the process returns to step S101. That is, the broadcast receiving apparatus 10 repeatedly executes the processes of steps S101 to S114.

According to the broadcast receiving device 10 according to the present embodiment, even if the reception quality of an analog radio broadcast deteriorates and noise is superimposed on the audio data while outputting an analog radio broadcast, it is possible to correctly detect the silent period and make the sound between the broadcast waves It will be possible to correct the time lag in data and seamlessly switch broadcast waves. Furthermore, since the correction of the time difference is performed by extending the silent section rather than by changing the playback speed of the audio data, the correction is prevented from giving a sense of discomfort to the user. Further, as in the present embodiment, by placing a restriction on the length by which the silent period is extended at a time (the length of the additional silent period), it is further possible to prevent the correction from giving a sense of discomfort to the user. .

The additional silent section audio data that the silent section expansion unit 7 inserts into the audio data that is being output may be complete silent data (voice data whose instantaneous levels are all 0), but it may be the actual silent section of the audio data that is being output. If the audio data contains noise, inserting completely silent data will give the user a sense of discomfort. In order to prevent this, the silent section expansion unit 7 adds pseudo noise (white noise) audio data to the silent section of the audio data that is being output, depending on the reception quality, or a part of the audio data in the silent section. It is preferable to insert audio data that is a duplicate of the original part.

The shorter the length of the additional silent section, the less uncomfortable the user will feel. However, if the additional silent period is too short, it will take time to reduce the amount of deviation between the audio data being output and the linked audio data to zero. Therefore, the length of the additional silent period is preferably about 10% of the length of the original silent period. However, if the reception quality of the audio data being output is low, the length of the additional silent period may be set to, for example, about 20% of the original silent period, so that you can quickly switch to the linked audio data. You can make it longer.

In addition, even if the amount of deviation between the audio data being output and the audio data at the link destination is 0, there may be a difference in sound quality, so frequent switching of audio data (i.e. switching of broadcast waves) may give the user a sense of discomfort. Therefore, for example, restrictions may be set such as prohibiting switching of broadcast waves for a certain period of time after switching of broadcast waves.

Furthermore, when switching broadcast waves, so-called "cross-fade" may be performed, in which the output of the audio data of the broadcast wave after switching is faded in while the audio of the broadcast wave before switching is faded out.

<Embodiment 2>
Embodiment 2 shows an example of the hardware configuration of broadcast receiving apparatus 10 shown in Embodiment 1.

5 and 6 are diagrams showing examples of the hardware configuration of the broadcast receiving device 10, respectively. Each function of the constituent elements of the broadcast receiving apparatus 10 shown in FIG. 1 is realized, for example, by the processing circuit 100 shown in FIG. 5. That is, the broadcast receiving device 10 demodulates the first audio data from the first broadcast wave, demodulates the second audio data from the second broadcast wave that broadcasts the same content as the first broadcast wave, and demodulates the second audio data from the second broadcast wave that broadcasts the same content as the first broadcast wave. The first audio data is stored, the second audio data is stored, the reception quality of the first audio data is evaluated, the reception quality of the second audio data is evaluated, and the first audio data and the second audio data are stored. Estimate the amount of time deviation from the audio data, and output either the first audio data or the second audio data based on the reception quality of the first audio data and the reception quality of the second audio data. The selected audio data, which is the one selected as the target and which is selected as the output target among the first audio data and the second audio data, is higher than the non-selected audio data, which is the one that is not selected as the output target. If the selected audio data is ahead, the silent section of the selected audio data is detected, and if the selected audio data is ahead of the non-selected audio data, the silent section of the selected audio data is extended and the selected audio data is shifted. A processing circuit for correcting the time difference between the selected audio data and the non-selected audio data by delaying the selected audio data by a length corresponding to the amount of time, and reproducing and outputting the selected audio data with the time difference corrected. 100. Further, the processing circuit 100 detects as a silent section a section in which the instantaneous level of the selected audio data is lower than a predetermined threshold value for a certain length or more, and when the selected audio data is audio data of analog radio broadcasting, The lower the reception quality of the selected audio data, the larger the threshold value is.

The processing circuit 100 may be dedicated hardware, or may include a processor (Central Processing Unit (CPU), processing device, arithmetic device, microprocessor, microcomputer, etc.) that executes a program stored in memory. It may be configured using a DSP (also called a Digital Signal Processor).

When the processing circuit 100 is dedicated hardware, the processing circuit 100 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field-Programmable Circuit). Gate Array), or a combination of these. The functions of each component of the broadcast receiving apparatus 10 may be realized by separate processing circuits, or these functions may be realized by a single processing circuit.

FIG. 6 shows an example of the hardware configuration of the broadcast receiving apparatus 10 in a case where the processing circuit 100 is configured using a processor 101 that executes a program. In this case, the functions of the components of the broadcast receiving device 10 are realized by software or the like (software, firmware, or a combination of software and firmware). Software etc. are written as programs and stored in the memory 102. The processor 101 implements the functions of each section by reading and executing programs stored in the memory 102. That is, when executed by the processor 101, the broadcast receiving device 10 performs a process of demodulating first audio data from a first broadcast wave, and a second broadcast wave that broadcasts the same content as the first broadcast wave. a process for demodulating the second audio data from the second audio data, a process for storing the first audio data, a process for storing the second audio data, a process for evaluating the reception quality of the first audio data, and a process for evaluating the reception quality of the first audio data. a process of evaluating the reception quality of the audio data; a process of estimating the amount of time shift between the first audio data and the second audio data; and a process of evaluating the reception quality of the first audio data and the second audio data. a process of selecting either the first audio data or the second audio data as an output target based on the reception quality of the first audio data or the second audio data; When the selected audio data that is present precedes the non-selected audio data that is not selected as the output target, the process of detecting a silent section of the selected audio data and the process of detecting the silent section of the selected audio data when the selected audio data is non-selected When the selected audio data is ahead of the audio data, by extending the silent section of the selected audio data and delaying the selected audio data by a length corresponding to the amount of deviation, the selected audio data can be A memory 102 is provided for storing a program that ultimately executes the process of correcting the deviation and the process of reproducing and outputting the selected audio data with the time deviation corrected. Further, based on the program, the processor 101 detects, as a silent section, a section in which the instantaneous level of the selected audio data continues to be lower than a predetermined threshold for a certain length or more, and detects as a silent section when the selected audio data is analog radio broadcasting. In the case of data, the lower the reception quality of the selected audio data, the larger the threshold value is set. In other words, this program can be said to cause the computer to execute the procedures and methods for operating the components of the broadcast receiving device 10.

Here, the memory 102 is a non-volatile or In addition to volatile semiconductor memory, HDD (Hard Disk Drive), magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc) and their drive devices, all storage media that will be used in the future. Good too.

The above describes the configuration in which the functions of the constituent elements of the broadcast receiving apparatus 10 are realized by either hardware, software, or the like. However, the present invention is not limited to this, and a configuration may be adopted in which some of the components of the broadcast receiving apparatus 10 are implemented by dedicated hardware, and other components are implemented by software or the like. For example, for some components, the functions are realized by the processing circuit 100 as dedicated hardware, and for some other components, the processing circuit 100 as the processor 101 executes a program stored in the memory 102. The function can be realized by reading and executing it.

As described above, the broadcast receiving apparatus 10 can realize each of the above functions using hardware, software, etc., or a combination thereof.

Note that it is possible to freely combine each embodiment, or to modify or omit each embodiment as appropriate.

Hereinafter, various aspects of the present disclosure will be collectively described as supplementary notes.

(Additional note 1)
a first demodulation unit that demodulates first audio data from a first broadcast wave;
a second demodulation unit that demodulates second audio data from a second broadcast wave that broadcasts the same content as the first broadcast wave;
a first buffer memory that stores the first audio data;
a second buffer memory that stores the second audio data;
a first reception quality evaluation unit that evaluates reception quality of the first audio data;
a second reception quality evaluation unit that evaluates reception quality of the second audio data;
an audio deviation amount estimation unit that estimates a temporal deviation amount between the first audio data and the second audio data;
an output audio selection unit that selects either the first audio data or the second audio data as an output target based on the reception quality of the first audio data and the reception quality of the second audio data; ,
Among the first audio data and the second audio data, the selected audio data that is selected as the output target precedes the non-selected audio data that is not selected as the output target. a silent section detection unit that detects a silent section of the selected audio data when the selected audio data is selected;
When the selected audio data precedes the non-selected audio data, extending the silent section of the selected audio data and delaying the selected audio data by a length corresponding to the shift amount, a silent section expansion unit that corrects a temporal shift of the selected audio data with respect to the non-selected audio data;
an audio output unit that reproduces and outputs the selected audio data with the time lag corrected;
Equipped with
The silent section detection unit detects, as the silent section, a section in which a state in which the instantaneous level of the selected audio data is lower than a predetermined threshold continues for a certain length or more,
When the selected audio data is analog radio broadcast audio data, the silent section detection unit increases the threshold value as the reception quality of the selected audio data is lower.
Broadcast receiving device.

(Additional note 2)
The silent section extension unit delays the selected audio data by a length corresponding to the shift amount by repeating extending the silent section of the selected audio data by a predetermined length.
Broadcast receiving device according to supplementary note 1.

(Additional note 3)
The silent section expansion unit increases the length of the silent section that is expanded at one time as the reception quality of the selected audio data is lower.
Broadcast receiving device according to appendix 2.

(Additional note 4)
The silent section expansion unit extends the silent section of the selected audio data by inserting pseudo-noise audio data according to reception quality of the selected audio data into the silent section.
The broadcast receiving device according to any one of Supplementary notes 1 to 3.

(Appendix 5)
The silent section expansion unit extends the silent section by inserting into the silent section of the selected audio data audio data that is a copy of a part of the audio data of the silent section.
The broadcast receiving device according to any one of Supplementary notes 1 to 3.

(Appendix 6)
The first reception quality evaluation section and the second reception quality evaluation section evaluate reception power levels, signal to noise ratios, and C/N ratios of the first broadcast waves and the second broadcast waves. to evaluate the reception quality of the first audio data and the second audio data based on either the stereo pilot carrier level) and the stereo pilot carrier level;
The broadcast receiving device according to any one of Supplementary notes 1 to 5.

(Appendix 7)
A first demodulation unit of the broadcast receiving device demodulates first audio data from the first broadcast wave,
a second demodulation unit of the broadcast receiving device demodulates second audio data from a second broadcast wave that broadcasts the same content as the first broadcast wave;
a first buffer memory of the broadcast receiving device stores the first audio data;
a second buffer memory of the broadcast receiving device stores the second audio data;
a first reception quality evaluation unit of the broadcast receiving device evaluates reception quality of the first audio data;
a second reception quality evaluation unit of the broadcast receiving device evaluates reception quality of the second audio data;
an audio deviation amount estimating unit of the broadcast receiving device estimates a temporal deviation amount between the first audio data and the second audio data;
The output audio selection unit of the broadcast receiving device selects either the first audio data or the second audio data based on the reception quality of the first audio data and the reception quality of the second audio data. Select as the output target,
Among the first audio data and the second audio data, the selected audio data that is selected as the output target precedes the non-selected audio data that is not selected as the output target. a silent interval detection unit of the broadcast receiving device detects a silent interval of the selected audio data,
When the selected audio data precedes the non-selected audio data, the silent section expansion unit of the broadcast receiving device expands the silent section of the selected audio data, and adjusts the selected audio data by the amount of deviation. correcting the temporal deviation of the selected audio data with respect to the non-selected audio data by delaying the selected audio data by a length corresponding to
an audio output unit of the broadcast receiving device reproduces and outputs the selected audio data with the time lag corrected;
The silent section detection unit detects, as the silent section, a section in which a state in which the instantaneous level of the selected audio data is lower than a predetermined threshold continues for a certain length or more,
When the selected audio data is analog radio broadcast audio data, the silent section detection unit increases the threshold value as the reception quality of the selected audio data is lower.
Broadcast playback method.

Reference Signs List 10 broadcast receiving device, 11 first demodulation section, 12 second demodulation section, 21 first buffer memory, 22 second buffer memory, 31 first reception quality evaluation section, 32 second reception quality evaluation section, 4 audio deviation amount estimation section, 5 output audio selection section, 6 silent section detection section, 7 silent section expansion section, 8 audio output section, 100 processing circuit, 101 processor, 102 memory.

Claims (7)

a first demodulation unit that demodulates first audio data from a first broadcast wave;
a second demodulation unit that demodulates second audio data from a second broadcast wave that broadcasts the same content as the first broadcast wave;
a first buffer memory that stores the first audio data;
a second buffer memory that stores the second audio data;
a first reception quality evaluation unit that evaluates reception quality of the first audio data;
a second reception quality evaluation unit that evaluates reception quality of the second audio data;
an audio deviation amount estimation unit that estimates a temporal deviation amount between the first audio data and the second audio data;
an output audio selection unit that selects either the first audio data or the second audio data as an output target based on the reception quality of the first audio data and the reception quality of the second audio data; ,
Among the first audio data and the second audio data, the selected audio data that is selected as the output target precedes the non-selected audio data that is not selected as the output target. a silent section detection unit that detects a silent section of the selected audio data when the selected audio data is selected;
When the selected audio data precedes the non-selected audio data, extending the silent section of the selected audio data and delaying the selected audio data by a length corresponding to the shift amount, a silent section expansion unit that corrects a temporal shift of the selected audio data with respect to the non-selected audio data;
an audio output unit that reproduces and outputs the selected audio data with the time lag corrected;
Equipped with
The silent section detection unit detects, as the silent section, a section in which a state in which the instantaneous level of the selected audio data is lower than a predetermined threshold continues for a certain length or more,
When the selected audio data is analog radio broadcast audio data, the silent section detection unit increases the threshold value as the reception quality of the selected audio data is lower.
Broadcast receiving device. The silent section extension unit delays the selected audio data by a length corresponding to the shift amount by repeating extending the silent section of the selected audio data by a predetermined length.
The broadcast receiving device according to claim 1. The silent section expansion unit increases the length of the silent section that is expanded at one time as the reception quality of the selected audio data is lower.
The broadcast receiving device according to claim 2. The silent section expansion unit extends the silent section by inserting into the silent section of the selected audio data pseudo-noise audio data according to the reception quality of the selected audio data. 3. The broadcast receiving device according to any one of 3. Claims 1 to 3, wherein the silent interval expansion unit extends the silent interval by inserting into the silent interval of the selected audio data audio data that is a copy of a part of the audio data of the silent interval. The broadcast receiving device according to any one of . The first reception quality evaluation section and the second reception quality evaluation section evaluate reception power levels, signal to noise ratios, and C/N ratios of the first broadcast waves and the second broadcast waves. to evaluate the reception quality of the first audio data and the second audio data based on either the stereo pilot carrier level) and the stereo pilot carrier level;
The broadcast receiving device according to any one of claims 1 to 3. A first demodulation unit of the broadcast receiving device demodulates first audio data from the first broadcast wave,
a second demodulation unit of the broadcast receiving device demodulates second audio data from a second broadcast wave that broadcasts the same content as the first broadcast wave;
a first buffer memory of the broadcast receiving device stores the first audio data;
a second buffer memory of the broadcast receiving device stores the second audio data;
a first reception quality evaluation unit of the broadcast receiving device evaluates reception quality of the first audio data;
a second reception quality evaluation unit of the broadcast receiving device evaluates reception quality of the second audio data;
an audio deviation amount estimating unit of the broadcast receiving device estimates a temporal deviation amount between the first audio data and the second audio data;
The output audio selection unit of the broadcast receiving device selects either the first audio data or the second audio data based on the reception quality of the first audio data and the reception quality of the second audio data. Select as the output target,
Among the first audio data and the second audio data, the selected audio data that is selected as the output target precedes the non-selected audio data that is not selected as the output target. a silent interval detection unit of the broadcast receiving device detects a silent interval of the selected audio data,
When the selected audio data precedes the non-selected audio data, the silent section expansion unit of the broadcast receiving device expands the silent section of the selected audio data, and adjusts the selected audio data by the amount of deviation. correcting the temporal deviation of the selected audio data with respect to the non-selected audio data by delaying the selected audio data by a length corresponding to
an audio output unit of the broadcast receiving device reproduces and outputs the selected audio data with the time lag corrected;
The silent section detection unit detects, as the silent section, a section in which a state in which the instantaneous level of the selected audio data is lower than a predetermined threshold continues for a certain length or more,
When the selected audio data is analog radio broadcast audio data, the silent section detection unit increases the threshold value as the reception quality of the selected audio data is lower.
Broadcast playback method.

Images