JP2007194970A - Broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast receiver which can provide highly precise uniform reproduced sound volumes of same audio broadcasts received by different broadcasting types. <P>SOLUTION: The broadcast receiver includes a delay output circuit 22 which delays output of an audio broadcast received by an analog tuner 1a on the basis of a difference between a reception time of the audio broadcast in the analog tuner 1a and that in a digital tuner 1b which receives the audio broadcast later than the analog tuner 1a. The broadcast receiver is so configured that the broadcast receiver detects difference between the sound volume of the audio broadcast delayed and output by the delay output circuit 22 and the sound volume of the audio broadcast output from the digital tuner 1b and provides uniform output sound volumes of audio broadcasts output from the analog tuner 1a and the digital tuner 1b on the basis of the detected difference. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a broadcast receiver such as a television receiver that receives the same audio broadcast in two different broadcast types, and more particularly to a technique for equalizing the reproduction volume of an audio broadcast received in each of the broadcast types. Is.

In recent years, digital television receivers (hereinafter referred to as “digital televisions”) that receive and reproduce digital television broadcasts (hereinafter referred to as “digital broadcasts”) in which video and audio are represented by digital signals are becoming widespread. The digital TV can receive not only digital broadcasts but also analog television broadcasts (hereinafter referred to as “analog broadcasts”) in which video and audio having the same contents as the digital broadcasts are expressed by analog signals. (See, for example, Patent Document 1).
By the way, it is known that the playback volume differs between the audio signal received by digital broadcasting and the audio signal received by analog broadcasting due to the difference in the broadcast type. For this reason, the digital television has a problem that the user feels uncomfortable when switching between digital broadcasting and analog broadcasting. Therefore, for example, the user takes time and effort to adjust the playback volume to a desired volume every time digital broadcasting and analog broadcasting are switched. Therefore, it is conceivable to compare an audio signal received by digital broadcasting with an audio signal received by analog broadcasting and correct it to have the same reproduction volume.
Japanese Patent Laid-Open No. 10-190499

However, it is known that the reception time differs between the digital broadcast and the analog broadcast due to the difference in the broadcast type. Specifically, digital broadcasting is received later than analog broadcasting. Therefore, just comparing the audio signal received by digital broadcasting and the audio signal received by analog broadcasting as they are, the audio signals are compared at different points in the broadcast content, and the playback volume is made uniform with high accuracy. The problem of not being able to do arises.
Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a broadcast receiving apparatus capable of equalizing the reproduction volume of the same audio broadcast received by different broadcast types with high accuracy. It is to provide.

In order to achieve the above object, the present invention provides a first audio broadcast receiving means for receiving and outputting an audio broadcast in a first broadcast type, and a second that has a reception time delayed from that of the first broadcast type. And a second audio broadcast receiving means for receiving and outputting the audio broadcast in a broadcast type, and receiving the audio broadcast by the first audio broadcast receiving means. A delay output means for delaying the output of the audio broadcast by the first audio broadcast reception means based on a time difference between the time and the reception time of the audio broadcast by the second audio broadcast reception means; Detecting a volume difference between the volume of the audio broadcast delayed and output by the delay output means and the volume of the audio broadcast output from the second audio broadcast receiving means, and based on the detected volume difference Said first sound Configured as a broadcast receiving apparatus characterized by equalizing the output volume of the audio broadcast to be output from the broadcast receiving means and said second audio broadcasting signal receiving unit.
Specifically, based on the volume difference between the volume of the audio broadcast output after being delayed by the delay output means and the volume of the audio broadcast output from the second audio broadcast receiving means, the first By adjusting and outputting the input / output magnification (gain) of the audio broadcast output from the audio broadcast receiving means or the second audio broadcast receiving means, the output volume of the audio broadcast can be made uniform It is.
According to the present invention, it is possible to reproduce the audio broadcast received in either the first broadcast type or the second broadcast type at the same output volume. Thereby, even if the first broadcast type and the second broadcast type are switched, the user does not feel uncomfortable. Therefore, the user can listen to the audio broadcast at the same volume in any case without adjusting the reproduction volume every time the first broadcast type and the second broadcast type are switched.

For example, the present invention is applied to a broadcast receiving apparatus in which the first broadcast type is analog television broadcast and the second broadcast type is digital television broadcast (including satellite digital television broadcast). The digital television broadcast is a concept including terrestrial digital television broadcast and satellite digital television broadcast. At this time, an analog signal indicating the audio broadcast output from the first audio broadcast receiving means is converted into a digital signal according to a clock signal used for receiving a digital signal of the digital television broadcast (including satellite digital television broadcast). By converting to, the phase difference between the output sound of the first sound broadcast receiving means and the output sound of the second sound broadcast receiving means can be eliminated.
In the present invention, the first broadcast type is terrestrial digital television broadcast, and the second broadcast type is satellite digital television broadcast, or the first broadcast type is satellite analog television. And the second broadcast type is a satellite digital television broadcast, the first broadcast type is an analog radio broadcast, and the second broadcast type is a digital radio broadcast. It is also applicable to.

Further, it is preferable that the apparatus further comprises time difference setting means for setting a time difference between the reception time of the audio broadcast by the first audio broadcast reception means and the reception time of the audio broadcast by the second audio broadcast reception means. Thereby, the time difference can be changed according to the situation, for example, when the time difference is different depending on the type of region or broadcasting station.
At this time, the time difference setting means detects the output volume difference by comparing the audio broadcast received by the first audio broadcast receiving means with the audio broadcast received by the second audio broadcast receiving means. A configuration that can do this is desirable. Thereby, it is possible to derive the time difference between the reception time of the first audio broadcast and the reception time of the second audio broadcast based on the output sound volume difference. The time difference may be detected, for example, by comparing signal waveforms of the audio broadcast received by the first audio broadcast receiving unit and the audio broadcast received by the second audio broadcast receiving unit. Is possible. Thereby, for example, the time difference can be automatically set according to the situation such as the region and the type of broadcasting station.

In addition, the first peak level detection means for detecting the peak level of the audio broadcast output after being delayed by the delay output means, and the peak level of the audio broadcast output from the second audio broadcast reception means. A configuration comprising second peak level detection means for detection is conceivable. In this case, based on the detection result by the first peak level detection means and the detection result by the second peak level detection means, the volume of the audio broadcast delayed and output by the delay output means and the second What is necessary is just to detect the volume difference with the volume of the said audio broadcast output from the audio broadcast receiving means.
At this time, the first average value calculating means for calculating the average value of the peak levels detected by the first peak level detecting means and the average value of the peak levels detected by the second peak level detecting means are calculated. A second average value calculating means for calculating is provided, and a volume difference between the average value detected by the first average value calculating means and the average value detected by the second average value calculating means is detected. May be.
In addition, it is preferable that a calculation target period changing unit that periodically changes a calculation target period of the average value by the first average value calculating unit and the second average value calculating unit is provided. As a result, detection errors caused by the first peak level detection means and the second peak level detection means can be periodically deleted, so that the first average value calculation means and the second average value calculation can be performed. The reliability of the average value calculation in the means is increased.

  According to the present invention, it is possible to reproduce the audio broadcast received in either the first broadcast type or the second broadcast type at the same output volume. Thereby, even if the first broadcast type and the second broadcast type are switched, the user does not feel uncomfortable. Therefore, the user can listen to the audio broadcast at the same volume in any case without adjusting the reproduction volume every time the first broadcast type and the second broadcast type are switched.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
FIG. 1 is a schematic configuration diagram of a television receiver X according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a volume adjustment circuit 2 provided in the television receiver X.
First, a schematic configuration of the television receiver X according to the embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the television receiver X includes an analog tuner 1a (an example of first audio broadcast receiving means), a digital tuner 1b (an example of second audio broadcast receiving means), a volume adjusting circuit 2, , Video switching circuit 3, video processing circuit 4, OSD processing circuit 5, monitor screen 6, remote control 7, remote control interface (I / F) circuit 8, audio switching circuit 9, speaker 10, and control The circuit 11 is schematically configured. The television receiver X includes other components included in a normal television receiver in addition to those shown in FIG. 1, but the description thereof is omitted here.
The control circuit 11 includes an MPU 11a that is an arithmetic means, a ROM 11b (EPROM) that is a storage means in which a control program executed by the MPU 11a is stored in advance, and a RAM 11c (a variety of information that is stored in the process executed by the MPU 11a). EEPROM) and the like, and controls the entire television receiver X.

The analog tuner 1a receives a terrestrial analog television broadcast (an example of a first broadcast type, hereinafter referred to as “analog broadcast”), and the digital tuner 1b is delayed from the terrestrial analog television broadcast. Terrestrial digital television broadcast (an example of a second broadcast type, hereinafter referred to as “digital broadcast”). Note that a video signal for a plurality of channels and an audio signal synchronized with the video are superimposed on each broadcast signal.
In each of the analog tuner 1a and the digital tuner 1b, a broadcast channel signal designated by the control circuit 11 is extracted (tuned) from each received broadcast signal, and a video signal and a signal are detected by detecting the extracted signal. The audio signal is extracted, and the video signal and the audio signal are transmitted to the video switching circuit 3 and the volume control circuit 2, respectively.

The video switching circuit 3 selects any one video signal from the video signals input from the analog tuner 1 a and the digital tuner 1 b in accordance with an instruction from the control circuit 11, and sends it to the video processing circuit 4. Output.
The video processing circuit 4 performs various signal processing on the video signal output from the video switching circuit 3. For example, separation of horizontal and vertical sync signals from the video signal, generation of a clock signal phase-synchronized with the sync signal, separation of luminance and color signals from the video signal, predetermined image quality improvement processing, etc. A signal is output to the OSD processing circuit 5.
Whether the OSD processing circuit 5 outputs the video signal output from the video processing circuit 4 to the monitor screen 6 so that the video signal processed by the video processing circuit 4 is displayed on the monitor screen 6 as it is. The video signal instructed by the control circuit 11 is superimposed on the video signal by superimposing (combined) to generate a video signal (hereinafter referred to as OSD video signal), and the OSD video signal is output to the monitor screen 6 The display is switched.
The monitor screen 6 is a display means including, for example, a liquid crystal panel and its peripheral devices, and displays video based on the video signal output from the OSD processing circuit 5 or the OSD video signal.

The remote controller 7 is a remote controller for operating the television receiver X, and a volume up button and a volume down button for performing an input operation for adjusting the output volume of the sound output from the speaker 10. In addition, a channel selection button for selecting a channel is provided.
The remote control interface circuit 8 acquires input operation information corresponding to each operation button from the remote control 7 by wireless transmission such as infrared transmission, and outputs the input operation information to the control circuit 11. For example, in the case where the audio output volume is manually adjusted by the viewer in the television receiver X, the control circuit 11 performs the above operation according to the input operation of the viewer with respect to the volume up button or the volume down button of the remote controller 7. An output volume adjustment command is output to the speaker 10, and the output volume of the sound output from the speaker 10 is adjusted according to the command. Similarly, when channel selection is performed, information on the input operation for the channel selection button of the remote controller 7 is input to the control circuit 11 through the remote control interface circuit 8, and according to the input operation information, the control circuit 11 Thus, a channel to be selected is designated for either the analog tuner 1a or the digital tuner 1b, and the video switching circuit 3 and the OSD are displayed so that the video of the channel is displayed on the monitor screen 6. The processing circuit 5 is controlled.

  The volume adjusting circuit 2 adjusts the audio signal included in the television broadcast of the same content input from the analog tuner 1a and the digital tuner 1b so that the output volume is the same, and then the audio switching circuit 9 is output. The audio switching circuit 9 outputs an arbitrary one of the two audio signals input from the volume adjustment circuit 2 to the speaker 10 in accordance with an instruction from the control circuit 11. The speaker 10 outputs (reproduces) sound based on the input sound signal, and the sound signal output from the sound switching circuit 9 is output (reproduced) by the speaker 10.

Here, the volume adjusting circuit 2 will be described in detail with reference to FIG. In the following description, it is assumed that the analog tuner 1a and the digital tuner 1b are outputting a television broadcast including an audio broadcast of the same content according to a command from the control circuit 11.
As shown in FIG. 2, the volume adjustment circuit 2 includes an analog / digital conversion circuit (A / D conversion circuit) 21, a delay output circuit 22 (an example of delay output means), an input / output magnification adjustment circuit 23, and a peak level detection. Circuit 24 (an example of first peak level detection means), input / output magnification adjustment circuit 31, peak level detection circuit 32 (an example of second peak level detection means), peak level comparison circuit 41 (an example of volume difference detection means) ) And a reset circuit 42 (an example of a calculation target period changing unit). Each processing operation performed in the volume control circuit 2 is controlled by the control circuit 11 executing a predetermined control program. In the present embodiment, the case where various processes described below are executed by the respective circuits will be described. However, any one or more of the processes may be executed by the control circuit 11. Considered as an example.

The audio signal output from the digital tuner 1 b is input to the input / output magnification adjustment circuit 31 and the peak level detection circuit 32 as it is.
The input / output magnification adjustment circuit 31 adjusts the output volume of the audio signal by changing the input / output magnification of the audio signal output from the digital tuner 1b to amplify or attenuate the audio signal. . As described above, the audio signal whose output volume is adjusted by the input / output magnification adjustment circuit 31 is output to the audio switching circuit 9.
The peak level detection circuit 32 detects the peak level of the audio signal output from the digital tuner 1b every predetermined time. The peak level detected by the peak level detection circuit 32 is output to the peak level comparison circuit 41.

On the other hand, the audio signal output from the analog tuner 1 a is input to the input / output magnification adjustment circuit 23 and the peak level detection circuit 24 via the A / D conversion circuit 21 and the delay output circuit 22.
The A / D conversion circuit 21 converts an analog audio signal input from the analog tuner 1 a into a digital signal and outputs the digital signal to the delay output circuit 22. The A / D conversion in the A / D conversion circuit 21 is executed in accordance with a system clock signal used for signal reception in the digital tuner 1b. That is, the digital tuner 1b and the A / D conversion circuit execute processing in synchronization. Accordingly, there is no phase difference between the audio signal output from the digital tuner 1b and the audio signal output from the A / D conversion circuit 21.

The delay output circuit 22 delays the audio signal output from the A / D conversion circuit 21 by a predetermined time and outputs it to the input / output magnification adjustment circuit 23 and the peak level detection circuit 24. Here, the time for delaying the audio signal in the delay output circuit 22 is set by, for example, the count value of the number of rises of the system clock signal, and is previously stored in the delay output circuit 22 or in the ROM 11b or RAM 11c of the control circuit 11 or the like. It is remembered. This delay time is set in advance based on the time difference between the reception time of the analog broadcast by the analog tuner 1a and the reception time of the digital broadcast by the digital tuner 1b. For example, the delay time is set to the same time as the time difference. The delay time may be set individually for each television broadcast channel having the same contents received by the analog tuner 1a and the digital tuner 1b. Accordingly, the present invention can also be applied to cases where the reception times of the analog tuner 1a and the digital tuner 1b are different for each channel.
The delay time is set by the control circuit 11 in accordance with the operation of the remote controller 7, and the control circuit 11 and the remote controller 7 when executing the setting process correspond to time difference setting means. Since the delay time can be changed by operating the remote controller 7 in this way, the optimum delay time can be set according to the situation such as the installation area or installation environment of the television receiver X. The delay output circuit 22 may be configured by combining a plurality of flip-flop circuits, for example.
Further, the audio signal (broadcast) received by the analog tuner 1a and the audio signal (broadcast) received by the digital tuner 1b are compared to detect an output volume difference, and based on the output volume difference, Another embodiment may be considered in which a time difference in the reception time of an audio signal (broadcast) is derived and the time difference is automatically set as a delay time by the delay output circuit 22. At this time, the detection process of the output volume difference is executed by the control circuit 11, and the control circuit 11 when executing the detection process corresponds to the output volume difference detecting means. The time difference derivation process and the delay time automatic setting process are also executed by the control circuit 11, and the control circuit 11 when executing these processes corresponds to a time difference setting means. For example, it is conceivable to derive the time difference between the reception times by comparing the audio and video signal waveforms output from the analog tuner 1a with the audio and video signal waveforms output from the digital tuner 1b. . This is preferable because the optimum delay time is automatically set automatically in accordance with the installation area, installation environment, type of broadcasting station, etc. of the television receiver X.

  The input / output magnification adjustment circuit 23 amplifies or attenuates the audio signal by changing the input / output magnification of the audio signal output from the analog tuner 1a via the A / D conversion circuit 21 and the delay output circuit 22. As a result, the output volume of the audio signal is adjusted. The audio signal whose output volume has been adjusted by the input / output magnification adjustment circuit 23 is output to the audio switching circuit 9. Note that if only the audio signal of the analog broadcast received by the analog tuner 1a is delayed, the video and audio reproduced on the television receiver X will be shifted, so that the video received by the analog tuner 1a. The signal is delayed by the same delay time as the delay output circuit 22 by a delay output circuit (not shown), and then input to the video switching circuit 3.

The peak level detection circuit 24 detects the peak level of the audio signal output from the delay output circuit 22 every predetermined time. The peak level detected by the peak level detection circuit 24 is output to the peak level comparison circuit 41.
As described above, in the volume adjustment circuit 2, the audio signal output from the analog tuner 1a is delayed by the delay output circuit 22, so that the audio signal and the audio signal output from the digital tuner 1b are combined. The time difference is eliminated. Therefore, the peak level detection circuit 24 and the peak level detection circuit 32 are inputted with audio signals at the same time in the television broadcast of the same content received by the analog broadcast and the digital broadcast.

The peak level comparison circuit 41 calculates an average value of each of the two peak levels input from the peak level detection circuit 24 and the peak level detection circuit 32 within a predetermined period. Here, the peak level comparison circuit 41 when calculating the average value of the peak levels input from the peak level detection circuit 24 is the first average value calculation means, the peak level input from the peak level detection circuit 32 The peak level comparison circuit 41 used for calculating the average value corresponds to the second average value calculation means.
The average value calculated here is calculated based on the peak level input within a predetermined period as described above. However, in consideration of the possibility of an error in the peak level detection by the peak level detection circuit 24 or the peak level detection circuit 32, it is desirable to periodically reset the calculation target of the average value.

Therefore, the volume adjustment circuit 2 is provided with a reset circuit 42 that periodically resets the average value calculated by the peak level comparison circuit 41. In the reset circuit 42, every time a predetermined time elapses, for example, every time a video synchronization signal (vertical / horizontal) or a system clock signal used in the digital tuner 1b is counted up to a predetermined value, the peak level is increased. A reset signal is transmitted to the comparison circuit 41. As a result, the peak value comparison circuit 41 resets the average value.
Therefore, even if a temporary error occurs in the detection of the peak level by the peak level detection circuit 24 or the peak level detection circuit 32, the error is excluded from the calculation target of the average value after the predetermined time has elapsed. Therefore, the reliability of the average value is increased. The processing by the reset circuit 42 is not limited to the resetting of the average value, but the average value calculation target is periodically changed, such as changing the average value calculation target to one input within the most recent predetermined period. As long as it changes.

Next, in the peak level comparison circuit 41, the average value of each of the two peak levels is compared and calculated, and the volume difference is detected. Here, the peak level comparison circuit 41 when performing such detection processing corresponds to a volume difference detecting means.
Thereafter, in the peak level comparison circuit 41, based on the difference in peak level, the output volume of the audio signal received by the analog tuner 1a is the same as the output volume of the audio signal received by the digital tuner 1b. The input / output magnification is calculated. The input / output magnification calculated here is input to the input / output magnification adjustment circuit 23. Thereby, in the input / output magnification adjustment circuit 23, the audio signal input from the analog tuner 1a via the A / D conversion circuit 21 and the delay output circuit 22 is calculated by the peak level comparison circuit 41. After being amplified or attenuated by the input / output magnification and adjusted to be the same as the output volume of the audio signal received by the digital tuner 1b, it is output to the audio switching circuit 9. That is, the output volume of the audio signal received by the analog tuner 1a and the output volume of the audio signal received by the digital tuner 1b are equalized and then output to the audio switching circuit 9. Here, the peak level comparison circuit 41 when the input / output magnification of the input / output magnification adjustment circuit 23 is changed to equalize the output sound volume corresponds to the sound volume equalizing means.
Note that, as a method for equalizing the output volume, the input / output magnification in the input / output magnification adjustment circuit 23 is changed based on the output volume of the audio signal received by the digital tuner 1b as described above. It is not limited to doing. For example, the peak level comparison circuit 41 may change the input / output magnification in the input / output magnification adjustment circuit 31 based on the output volume of the audio signal received by the analog tuner 1a. It is done. Of course, the output level may be made uniform by changing both the input / output magnification in the input / output magnification adjustment circuits 23 and 31 by the peak level comparison circuit 41.

In this way, in the volume adjustment circuit 2, the peak level detected at the same time in the audio broadcasting of the same content is compared by the peak level comparison circuit 41, and output from the analog tuner 1a based on the comparison result. Since the output volume of the audio signal and the audio signal output from the digital tuner 1b is adjusted, the output volume of the analog broadcast and the digital broadcast can be made uniform with high accuracy.
As a method of comparing the output volume of the audio signal output from the analog tuner 1a with the output volume of the audio signal output from the digital tuner 1b, the peak level of each output volume as described above is used. The comparison is not limited to the average value, and the peak level of the output volume itself may be compared. Moreover, you may compare the waveform of each audio | voice signal.

In this embodiment, terrestrial analog television broadcast and terrestrial digital television broadcast have been described as examples of different broadcast types, but the present invention is not limited to this, and terrestrial analog television broadcast is not limited thereto. Applicable when receiving the same audio broadcast in at least two broadcast types among terrestrial digital television broadcast, satellite analog television broadcast, satellite digital television broadcast, analog radio broadcast and digital radio broadcast Can do.
Specifically, terrestrial analog television broadcast (an example of the first broadcast type), satellite analog television broadcast (an example of the second broadcast type), terrestrial analog television broadcast (an example of the first broadcast type) ), Satellite digital television broadcast (an example of the second broadcast type), terrestrial digital television broadcast (an example of the first broadcast type), satellite analog television broadcast (an example of the second broadcast type), terrestrial Digital television broadcast (an example of the first broadcast type) and satellite digital television broadcast (an example of the second broadcast type), satellite analog television broadcast (an example of the first broadcast type) and satellite digital television broadcast ( A combination of analog broadcast (an example of the first broadcast type) and digital radio broadcast (an example of the second broadcast type) is considered. It is.

1 is a schematic configuration diagram of a television receiver X according to an embodiment of the present invention. The schematic block diagram of the volume control circuit 2 provided in the television receiver X which concerns on embodiment of this invention.

Explanation of symbols

1a: Analog tuner (an example of a first audio broadcast receiving means)
1b: Digital tuner (an example of second audio broadcast receiving means)
2 ... Volume adjustment circuit 3 ... Video switching circuit 4 ... Video processing circuit 5 ... OSD processing circuit 6 ... Monitor screen 7 ... Remote control 8 ... Remote control interface circuit 9 ... Audio switching circuit 10 ... Speaker 11 ... Control circuit 21 ... A / D conversion Circuit (an example of analog / digital conversion means)
22 ... Delay output circuit (an example of delay output means)
23, 31 ... I / O magnification adjustment circuit 24 ... Peak level detection circuit (an example of first peak level detection means)
32... Peak level detection circuit (an example of second peak level detection means)
41... Peak level comparison circuit 42... Reset circuit (an example of calculation target period changing means)

Claims (12)

A first audio broadcast receiving means for receiving and outputting an audio broadcast in the first broadcast type;
Second audio broadcast receiving means for receiving and outputting the audio broadcast in a second broadcast type whose reception time is delayed from that of the first broadcast type;
Based on the time difference between the reception time of the audio broadcast by the first audio broadcast reception means and the reception time of the audio broadcast by the second audio broadcast reception means, the audio broadcast by the first audio broadcast reception means Delay output means for delaying the output of
A volume difference detecting means for detecting a volume difference between the volume of the audio broadcast delayed and output by the delay output means and the volume of the audio broadcast output from the second audio broadcast receiving means;
Volume equalization means for equalizing the output volume of the audio broadcast output from the first audio broadcast reception means and the second audio broadcast reception means based on the volume difference detected by the volume difference detection means When,
A broadcast receiving apparatus comprising:   Based on the volume difference detected by the volume difference detecting means, the volume leveling means inputs the audio broadcast output from the first audio broadcast receiving means and / or the second audio broadcast receiving means. The broadcast receiving apparatus according to claim 1, wherein the output magnification is adjusted and output.   3. The broadcast receiving apparatus according to claim 1, wherein the first broadcast type is an analog television broadcast, and the second broadcast type is a digital television broadcast (including satellite digital television broadcast). .   An analog signal indicating the audio broadcast output from the first audio broadcast receiving means is converted into a digital signal in accordance with a clock signal used for receiving a digital signal of the digital television broadcast (including satellite digital television broadcast). 4. The broadcast receiving apparatus according to claim 3, further comprising analog / digital conversion means.   3. The broadcast receiving apparatus according to claim 1, wherein the first broadcast type is terrestrial digital television broadcast, and the second broadcast type is satellite digital television broadcast.   3. The broadcast receiving apparatus according to claim 1, wherein the first broadcast type is satellite analog television broadcast, and the second broadcast type is satellite digital television broadcast.   The broadcast receiving apparatus according to claim 1, wherein the first broadcast type is an analog radio broadcast, and the second broadcast type is a digital radio broadcast.   8. A time difference setting unit for setting a time difference between the reception time of the audio broadcast by the first audio broadcast reception unit and the reception time of the audio broadcast by the second audio broadcast reception unit. The broadcast receiving apparatus according to any one of the above.   An output volume for detecting a difference in output volume by comparing the audio broadcast received by the first audio broadcast receiving means and the audio broadcast received by the second audio broadcast receiving means by the time difference setting means The broadcast receiving apparatus according to claim 8, comprising difference detection means. The volume difference detecting means is
First peak level detecting means for detecting the peak level of the audio broadcast output after being delayed by the delay output means, and detecting the peak level of the audio broadcast output from the second audio broadcast receiving means. A second peak level detecting means,
The broadcast receiving apparatus according to any one of claims 1 to 9, wherein a volume difference is detected based on a detection result by the first peak level detection means and a detection result by the second peak level detection means. The volume difference detecting means is
A first average value calculating means for calculating an average value of peak levels detected by the first peak level detecting means; and a first average value calculating means for calculating an average value of peak levels detected by the second peak level detecting means. Comprising means for calculating the average of the two,
The broadcast receiving apparatus according to claim 10, wherein a volume difference between an average value detected by the first average value calculating means and an average value detected by the second average value calculating means is detected.   The sound volume difference detecting means comprises a calculation target period changing means for periodically changing a calculation target period of an average value by the first average value calculating means and the second average value calculating means. The broadcast receiving apparatus described.

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