JP4851387B2 - Sound reproduction apparatus and sound reproduction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic reproduction device and an acoustic reproduction method, capable of controlling frequency characteristics corresponding to one acoustic type to more optimal frequency characteristics by controlling acoustic frequency characteristics according to the acoustic type. <P>SOLUTION: An audio output conversion device 100 as the acoustic reproduction device is provided with: an acoustic amplification part 110 for amplifying input audio data by a predetermined amplification rate for every frequency characteristics of the audio data; and a control part 130 for controlling the amplification rate of every frequency characteristics. The control part 130 controls the frequency characteristics of the amplification rate based on a volume value designated from the outside and information for identifying the type of audio data. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a sound reproduction device that reproduces sound by adjusting a gain of a sound signal using a filter having frequency characteristics.

  When viewing a broadcast program with a television broadcast receiver (hereinafter referred to as a television) in a general household, the volume of the volume output by the television is set relatively small in consideration of the viewing environment with the adjacent room or neighbor. I often watch broadcast programs. In this way, as the volume output by the TV is reduced, the broadcast program to be watched is music, and there is no sense of realism, and when the target to watch is a human voice, Becomes unclear.

  Furthermore, in recent years, with the increase in size of televisions, there has been a demand for audio reproduction methods with a sense of presence that match the viewing environment of large televisions. Here, Patent Document 1 discloses a sound reproduction device including a sound determination device that determines whether sound is input to a sound signal input by broadcast radio waves or the like.

In the sound reproduction device disclosed in Patent Document 1, the sound discriminating device provided therein discriminates whether the sound included in the input acoustic signal is voice or music, and based on the discrimination result in the voice discriminating device, The frequency characteristics of the signal are changed to the optimal frequency characteristics. That is, the type of sound included in the sound signal input to the sound reproducing device is determined, and the frequency characteristics of the sound to be output are controlled according to the type of sound. As a result, when the sound included in the input sound signal is music, a realistic sound can be output. On the other hand, when the sound included in the input sound signal is sound, the sound is clear and clear. Sounds that are easy to hear can be output.
JP 7-13586 A (published January 17, 1995)

  However, in the conventional example, the sound reproducing device determines the frequency characteristic of the sound to be output based only on the determination result of music or sound with respect to the input sound signal. In other words, the sound reproduction apparatus of the conventional example controls sound by one frequency characteristic for one kind of sound.

  Therefore, the sound reproduction device of the conventional example controls the frequency characteristics of the sound to be output according to the type of sound even when the volume of the sound to be output is large, so that the sound quality of the human voice to be output changes. There is.

  Furthermore, in the case of a volume value that is not normally used, such as when the volume of the sound to be output is very small, there is a problem that the frequency characteristics by the conventional sound reproduction device cannot obtain a sufficient effect. is there. As a result, when the volume of the sound to be output is very small, there is a problem that human sound, which is the sound to be output, is not clear and difficult to hear.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to further optimize the frequency characteristic corresponding to one acoustic type when controlling the frequency characteristic of the acoustic according to the acoustic type. An object of the present invention is to provide a sound reproducing device and a sound reproducing method that can be controlled to have a proper frequency characteristic.

In order to solve the above-described problem, the sound reproducing device according to the present invention provides
An acoustic reproduction apparatus comprising: an amplifying unit that amplifies an input acoustic signal at a predetermined amplification factor for each frequency of the acoustic signal; and a control unit that controls the amplification factor for each frequency, The control means controls the amplification factor for each frequency based on a volume value designated from the outside and information for identifying the type of the acoustic signal.

  The volume value is a value designated by the user who views the sound output from the sound reproduction device, and the user adjusts the volume of the sound output from the sound reproduction device by adjusting the volume value.

  According to said structure, the amplification factor in an amplification means can be controlled for every frequency of an acoustic signal based on the volume value and the kind of acoustic signal. Thus, the frequency of the acoustic signal amplified by the amplifying means is controlled based on not only the type of the acoustic signal but also the volume value specified by the user for each frequency of the amplifying means. The characteristic is a frequency characteristic based on the type of the acoustic signal and the volume designated by the user.

  For example, when the acoustic signal is an audio signal and the volume value is small, the amplification factor can be controlled so as to emphasize the human audio band. In this way, by controlling the amplification factor so as to emphasize the human voice band, the frequency characteristic of the acoustic signal output from the amplifying means is such that the human voice band is emphasized. As a result, even when the user reduces the sound volume, it is possible to output sound with clear human voice.

  On the other hand, in the same way, even when the acoustic signal is a voice signal, when the volume value is large, it is not difficult to hear human voice, so in the frequency of the acoustic signal from low to high frequencies. By making the amplification factor constant, it is possible to prevent the sound quality of the human voice to be output from changing.

  As described above, the sound reproducing device of the present invention can control the frequency characteristic corresponding to one type of sound to a more optimal frequency characteristic when controlling the frequency characteristic of sound according to the type of sound.

In order to solve the above-described problem, the sound reproduction method according to the present invention provides
An acoustic reproduction method comprising: an amplification step for amplifying an input acoustic signal with a predetermined amplification factor for each frequency of the acoustic signal; and a control step for controlling the amplification factor for each frequency, In the control step, the amplification factor is controlled for each frequency based on a volume value designated from the outside and information for identifying the type of the acoustic signal.

  According to said structure, there exists an effect similar to the sound reproduction apparatus which concerns on this invention.

In the sound reproducing device according to the present invention,
Determining means for determining the type of the acoustic signal;
The determination means preferably determines at least one of determination of whether the acoustic signal is an audio signal and determination of whether it is a music signal from the acoustic signal.

  According to the above configuration, the determination unit can determine from the acoustic signal whether the acoustic signal is a voice signal or a music signal.

The sound reproduction method according to the present invention further includes:
A determination step of determining a type of the acoustic signal, wherein in the determination step, at least one of determination of whether the acoustic signal is an audio signal and determination of whether it is a music signal, It is preferable to determine from an acoustic signal.

  According to said structure, there exists an effect similar to the sound reproduction apparatus which concerns on this invention.

In the sound reproducing device according to the present invention,
The determination unit preferably includes a sound determination unit that determines whether the sound signal is a sound signal, and a music determination unit that determines whether the sound signal is a music signal. .

  According to the above configuration, it is possible to determine whether the sound signal is a sound signal or not from the sound signal itself input to the sound reproducing device, and to determine whether the sound signal is a music signal or not. . Therefore, the determination means can more accurately determine whether the input acoustic signal is an audio signal or a music signal.

In the sound reproducing device according to the present invention,
When the sound determination means determines that the sound signal is a sound signal and the music determination means determines that the sound signal is a music signal, or the sound determination means determines that the sound signal is When it is determined that the sound signal is not a sound signal and the music determination means determines that the acoustic signal is not a music signal, the determination means determines that the sound signal is not a music signal or a sound signal. It is preferable to determine that it is a signal.

  According to the above configuration, it can be determined that the sound signal input to the sound reproduction device is another signal that is neither a sound signal nor a music signal. As a result, when the input acoustic signal is a signal including voice and music, the control means can control the amplification factor according to the situation of both.

In the sound reproducing device according to the present invention,
When the determination means determines that the acoustic signal is an audio signal, and the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order, the control The means is configured to make the amplification factor of the middle region larger than the amplification factors of the low region and the high region, and as the volume value is smaller, the amplification factor of the low region and the high region, It is preferable to control the amplification factor so that the difference from the amplification factor becomes large.

  First, the main band of human voice corresponds to the mid band of the frequency of the acoustic signal. According to the above configuration, when the determination unit determines that the acoustic signal is an audio signal, the middle band of the acoustic signal is emphasized from the low band and the high band. Furthermore, the smaller the volume value, the more the mid-band is emphasized. Therefore, even when the volume value is small, the middle band is emphasized, in other words, the main band of human voice is emphasized, and as a result, an acoustic signal that is easy to hear can be output. .

  Furthermore, according to the above configuration, when the volume value is large, that is, when the volume value is sufficiently easy to hear a human voice, the emphasis on the middle band is reduced. As a result, there is an effect that it is possible to reduce a change in sound quality in human voice that occurs by emphasizing the mid-range band.

In the sound reproducing device according to the present invention,
When the determination means determines that the acoustic signal is a music signal and the frequency band of the acoustic signal is divided into three bands of low, middle, and high frequencies in order from the lowest, the control The means is configured to increase the amplification factor of at least one of the low band and the high band above the amplification factor of the middle band, and as the volume value is smaller, at least one of the low band or the high band. It is preferable to control the amplification factor so that the difference between one of the increased amplification factors and the mid-range amplification factor becomes large.

  According to the above configuration, when the sound signal is determined to be a music signal, the smaller the volume value, the higher the amplification factor of at least one of the low frequency and the high frequency. In general, music uses more low-frequency and higher-frequency bands than human speech. Furthermore, the smaller the volume value, the lower the sense of presence of the music that is output.

  Here, the sound reproducing apparatus of the present invention has the above-described configuration, and thus emphasizes the low frequency band and the high frequency band when the volume value is small. As a result, there is an effect of suppressing the volume value from being reduced and the presence of music from being lowered.

In the sound reproducing device according to the present invention,
When the determination means determines that the acoustic signal is another signal, and the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order, the control It is preferable that the means controls the amplification factor so that the amplification factors of the low band, the middle band, and the high band are constant.

  According to the above configuration, when the acoustic signal is neither an audio signal nor a music signal, in other words, when it is determined as an unknown signal, the amplification factor for the band from low to high is increased. Will be constant. Thereby, there is an effect that it is possible to prevent a change in the sound quality of the sound, which is generated by emphasizing a specific band.

In the sound reproducing device according to the reference of the present invention,
The acoustic signal is included in the broadcast radio wave, and information indicating the genre of the broadcast program contained in the broadcast radio wave is input to the sound reproduction device, and the control means determines the type of the acoustic signal. It is preferable to control the amplification factor by using information indicating the genre as identification information.

  According to said structure, the amplification factor can be controlled for every frequency of an acoustic signal using the information which shows the genre of a broadcast program as information which identifies the kind of acoustic signal. Since the information indicating the genre of the broadcast program is information included in the broadcast radio wave, it can be easily acquired. As a result, there is an effect that it is not necessary to provide a complicated circuit for acquiring information for identifying the type of the acoustic signal.

Sound reproducing method according to a reference of the present invention, furthermore,
The acoustic signal is included in the broadcast radio wave. In the sound reproduction method, information indicating the genre of the broadcast program included in the broadcast radio wave is input, and in the control step, the type of the acoustic signal is set. It is preferable to control the amplification factor by using information indicating the genre as identification information.

  According to said structure, there exists an effect similar to the sound reproduction apparatus which concerns on this invention.

In the sound reproducing device according to the reference of the present invention,
The control means determines from the information indicating the genre whether the acoustic signal is an audio signal, a music signal, or another signal, and uses the result determined by itself. Thus, it is preferable to control the amplification factor.

  With the above-described configuration, the control unit can determine whether the acoustic signal is an audio signal, a music signal, or another signal from information indicating a genre. As a result, it is possible to classify the types of acoustic signals into three types, and it is possible to simplify the control of the amplification factor in the amplification unit for each frequency of the acoustic signal.

In the sound reproducing device according to the reference of the present invention,
When the control means determines that the acoustic signal is an audio signal and the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order, the control The means is configured to make the amplification factor of the middle region larger than the amplification factors of the low region and the high region, and as the volume value is smaller, the amplification factor of the low region and the high region, It is preferable to control the amplification factor so that the difference from the amplification factor becomes large.

  According to the above configuration, when it is determined that the acoustic signal is an audio signal, the middle band of the acoustic signal is emphasized from the low band and the high band. Furthermore, the smaller the volume value, the more the mid-band is emphasized. Therefore, even when the volume value is small, the middle band is emphasized, in other words, the main band of human voice is emphasized, and as a result, an acoustic signal that is easy to hear can be output. .

In the sound reproducing device according to the reference of the present invention,
When the control means determines that the acoustic signal is a music signal and the frequency band of the acoustic signal is divided into three bands of low, middle, and high frequencies in order from the lowest, the control The means is configured to increase the amplification factor of at least one of the low band and the high band above the amplification factor of the middle band, and as the volume value is smaller, at least one of the low band or the high band. It is preferable to control the amplification factor so that the difference between one of the increased amplification factors and the mid-range amplification factor becomes large.

  According to the above configuration, when the sound signal is determined to be a music signal, the smaller the volume value, the higher the amplification factor of at least one of the low frequency and the high frequency. As described above, when the volume value is small, by emphasizing the low frequency band and the high frequency band, there is an effect of suppressing a decrease in the realism of the music when the volume value is small.

In the sound reproducing device according to the reference of the present invention,
When the control means determines that the acoustic signal is another signal and the frequency band of the acoustic signal is divided into three bands of low, middle, and high frequencies in ascending order, the control It is preferable that the means controls the amplification factor so that the amplification factors of the low band, the middle band, and the high band are constant.

  According to the above configuration, when the acoustic signal is neither an audio signal nor a music signal, in other words, when it is determined as an unknown signal, the amplification factor for the band from low to high is increased. Will be constant. The effect of this is as described above.

In the sound reproducing device according to the reference of the present invention,
The acoustic signal is included in a broadcast radio wave, and information indicating the genre of the broadcast program included in the broadcast radio wave is input to the sound reproduction device, and whether the acoustic signal is an audio signal. Determination means for determining at least one of determination or whether the signal is a music signal, and the control means uses the determination result of the determination means and the information as information for identifying the type of the acoustic signal. It is preferable to control the amplification factor using information indicating a genre.

  According to said structure, an acoustic reproduction apparatus controls an amplification factor for every frequency of an acoustic signal using two information, the information which shows the determination result of a determination means, and a genre. As a result, there is an effect that the amplification factor corresponding to the type of the acoustic signal can be controlled more accurately for each frequency of the acoustic signal.

Moreover, in the sound reproduction method according to the reference of the present invention,
The acoustic signal is included in the broadcast radio wave. In the sound reproduction method, information indicating the genre of the broadcast program included in the broadcast radio wave is input, and whether the acoustic signal is an audio signal. A determination step for determining at least one of determination or determination as to whether the signal is a music signal, and the control step uses the determination result of the determination unit and the information as information for identifying the type of the acoustic signal. It is preferable to control the amplification factor using information indicating a genre.

  According to said structure, there exists an effect similar to the sound reproduction apparatus which concerns on this invention.

In the sound reproducing device according to the reference of the present invention,
The determination means includes sound determination means for determining whether the acoustic signal is a sound signal, and music determination means for determining whether the sound signal is a music signal, and the control means includes It is preferable to determine from the information indicating the genre whether the acoustic signal is a voice signal, a music signal, or another signal.

  According to the above configuration, the sound reproduction device uses either the determination result of the determination unit and the determination result of the control unit, and the sound signal is any of a sound signal, a music signal, and other signals. It is determined whether it is a signal.

Here, the control means determines the type of sound from information indicating the genre of the broadcast program, and the determination means determines the type of sound from the input sound signal, and the two determination results The sound reproduction apparatus according to the reference of the present invention can also control the amplification factor in the amplification means. For example, the information indicating the genre of the broadcast program is information indicating the genre of the music system, the control means determines that the acoustic signal is a music signal, and the determination means further determines that the acoustic signal is an audio signal. When the determination is made, priority is given to the determination result of the determination means, and the mid band in the frequency of the acoustic signal is emphasized. However, the degree of emphasis on the mid band is reduced in consideration of the determination result in the control means. . As described above, by using the two determination results, that is, the determination result from the control means and the determination result from the determination means, the amplification factor in the amplification means can be controlled more optimally.

In the sound reproducing device according to the reference of the present invention,
When the sound determination means determines that the sound signal is a sound signal and the music determination means determines that the sound signal is a music signal, or the sound determination means determines that the sound signal is When it is determined that the sound signal is not a sound signal and the music determination means determines that the acoustic signal is not a music signal, the determination means is another signal that is neither music nor sound. Is preferably determined.

  According to the above configuration, it can be determined that the sound signal input to the sound reproduction device is another signal that is neither a sound signal nor a music signal. As a result, when the input acoustic signal is a signal including voice and music, the control means can control the amplification factor according to the situation of both.

In the sound reproducing device according to the reference of the present invention,
When the determination means determines that the acoustic signal is another signal, the control means preferably controls the amplification factor based on its determination result.

  Thus, even if the sound signal is determined to be another signal by the determination means, in other words, even if it is determined as an unknown signal, the amplification factor is determined for each frequency of the sound signal based on the determination result by the control means. There is an effect that it can be controlled appropriately.

In the sound reproducing device according to the reference of the present invention,
When the determination means determines that the acoustic signal is an audio signal, and the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order, the control The means is configured to make the amplification factor of the middle region larger than the amplification factors of the low region and the high region, and as the volume value is smaller, the amplification factor of the low region and the high region, It is preferable to control the amplification factor so that the difference from the amplification factor becomes large.

  According to the above configuration, when it is determined that the acoustic signal is an audio signal, the middle band of the acoustic signal is emphasized from the low band and the high band. The effects at this time are as described above.

In the sound reproducing device according to the reference of the present invention,
When the control means determines that the acoustic signal is a music signal or other signal, the control means determines that the mid-range amplification factor is greater than the determination result when the acoustic signal is determined to be a sound signal. The amplification factor is preferably controlled so as to reduce the difference between the amplification factor of the low band and the high band.

  According to the above configuration, when the determination unit determines that the acoustic signal is an audio signal, it is possible to control the degree of emphasis on the mid-band based on the determination result by the control unit.

In the sound reproducing device according to the reference of the present invention,
When the determination means determines that the acoustic signal is a music signal and the frequency band of the acoustic signal is divided into three bands of low, middle, and high frequencies in order from the lowest, the control The means is configured to increase the amplification factor of at least one of the low band and the high band above the amplification factor of the middle band, and as the volume value is smaller, at least one of the low band or the high band. It is preferable to control the amplification factor so that the difference between one of the increased amplification factors and the mid-range amplification factor becomes large.

  According to the above configuration, when the sound signal is determined to be a music signal, the smaller the volume value, the higher the amplification factor of at least one of the low frequency and the high frequency. The effects at this time are as described above.

In the sound reproducing device according to the reference of the present invention,
When the control means determines that the acoustic signal is an audio signal or other signal, the determination result of the control means is higher than that when the acoustic signal is determined to be a music signal. The amplification factor is preferably controlled so as to reduce the difference between the amplification factor of the low band and the high band.

  According to the above configuration, when the determination unit determines that the acoustic signal is a music signal, the degree of emphasis on at least one of the low range and the high range can be controlled based on the determination result from the control unit.

In the sound reproducing device according to the reference of the present invention,
In the case where the determination means determines that the acoustic signal is another signal, and the control means determines that the acoustic signal is an audio signal, the frequency band of the acoustic signal is set in ascending order. In the case of dividing into three bands, a low band, a middle band, and a high band, the control means makes the amplification factor of the middle band larger than the amplification factors of the low band and the high band, and the volume value is It is preferable to control the amplification factor so that the difference between the amplification factor of the low region and the high region and the amplification factor of the middle region becomes larger as the value is smaller.

  According to the above configuration, even when the determination unit determines that the acoustic signal is another signal, in other words, a signal that is unknown whether speech or music, the control unit determines that the acoustic signal is a speech signal. Based on the result, it is possible to emphasize the middle band in the frequency of the audio signal. Furthermore, the smaller the volume value, the more emphasis is placed on the mid-range band, which is the main band in human voice, so even when the volume value is small, the human voice is clarified and easy-to-hear sound is output. it can.

In the sound reproducing device according to the reference of the present invention,
In the case where the determination means determines that the acoustic signal is another signal, and the control means determines that the acoustic signal is a music signal, the frequency band of the acoustic signal is set in ascending order. When divided into three bands, a low band, a middle band, and a high band, the control means makes the amplification factor of at least one of the low band or the high band larger than the amplification factor of the middle band. The gain is controlled so that the smaller the volume value is, the larger the difference between the increased gain of at least one of the low range and the high range and the mid range is. It is preferable.

  According to the above configuration, even when the determination unit determines that the acoustic signal is another signal, in other words, a signal that is unknown whether speech or music, the determination by the control unit is that the acoustic signal is a music signal. Based on the result, it is possible to emphasize at least one of the low frequency band and the high frequency band in the frequency of the audio signal. Further, as the volume value is smaller, at least one of the low frequency band and the high frequency band is emphasized, so that an effect of suppressing a decrease in the realism of music when the volume value is small is achieved.

In the sound reproducing device according to the reference of the present invention,
In the case where the determination means determines that the acoustic signal is another signal and the control means determines that the acoustic signal is another signal, the frequency band of the acoustic signal is set in ascending order. When divided into three bands, a low band, a middle band, and a high band, the control means controls the amplification factor so that the amplification factors of the low band, the middle band, and the high band are constant. It is preferable to do.

  According to the above configuration, when the two determination results of the determination unit and the control unit are both determined that the acoustic signal is another signal, in other words, an unknown signal, amplification for a band from a low range to a high range is performed. The rate will be constant. Thereby, there is an effect that it is possible to prevent a change in the sound quality of the sound, which is generated by emphasizing a specific band.

  As described above, the sound reproduction device and the sound reproduction method of the present invention control the amplification factor for each sound signal based on the volume value and the information for identifying the type of the sound signal. Therefore, when controlling the frequency characteristic of the sound according to the type of sound, the frequency characteristic corresponding to one type of sound can be controlled to a more optimal frequency characteristic.

  Embodiments according to the present invention will be described below with reference to the drawings.

[Embodiment 1]
A first embodiment of the present invention will be described below with reference to FIGS.

(Configuration of Television Broadcast Receiving / Reproducing Device 10)
First, with reference to FIG. 2, the structure of the television broadcast receiving / reproducing apparatus 10 provided with the audio output converter 100 of the present invention will be described. FIG. 2 is a block diagram showing a configuration of the television broadcast receiving / reproducing device 10 including the audio output conversion device 100. FIG. 2 shows only the main components of the television method receiving / reproducing device 10 extracted.

  As shown in the figure, a television broadcast receiving / reproducing device (hereinafter referred to as a television) 10 includes an analog tuner unit 20 for inputting an analog broadcast signal received from an antenna, and a digital for inputting a digital broadcast signal received from the antenna. A tuner unit 30, an AV switch unit 21 that divides an analog broadcast signal into video data and audio data, a digital demodulation unit 31 that demodulates the digital broadcast signal, and a digital video signal and digital audio data that are demodulated. A separation unit 32 that divides the digital video data, a video decoding unit 33 that decodes the digital video data, an audio decoding unit 34 that decodes the digital audio data, a video selector unit 40, an audio selector unit 41, and a video output conversion unit 42. Audio output conversion device 00 and a (sound reproduction device).

(Operation of the television broadcast receiver 10)
The television 10 inputs an analog broadcast signal, which is a broadcast program received by the antenna, to the AV switch unit 21 via the analog tuner unit 20. The AV switch unit 21 divides the input analog broadcast signal into video data that is video information in a broadcast program and audio data that is acoustic information. The video selector unit 40 inputs the video data divided by the AV switch unit 21. Further, the audio selector unit 41 inputs the audio data divided by the AV switch unit 21.

  On the other hand, the digital demodulator 31 receives the digital broadcast signal received from the antenna via the digital tuner unit 30, and demodulates the input digital broadcast signal. Next, the separation unit 32 outputs the digital broadcast signal demodulated by the digital demodulation unit 31. Here, the separation unit 32 divides the digital broadcast signal demodulated by the digital demodulation unit 31 into digital video data that is video information and digital audio data that is acoustic information. Since the digital video data divided by the separation unit 32 is encoded data, the video decoding unit 33 decodes the digital video data and outputs it to the video selector 40 as video data. Similarly, since the digital audio data is also encoded data, the audio decoding unit 34 decodes the digital audio data and outputs it to the audio selector unit 41.

  Next, the video selector unit 40 having input the video data from the AV switch unit 21 and the video data from the video decoding unit 33 selects the video data corresponding to the broadcast program to be reproduced from the two input video data. Select and output to the video output converter 42. The video output conversion unit 42 converts the input video data into a data format that can be reproduced on the liquid crystal display panel 50. The video data converted by the video output conversion device 42 is displayed on the liquid crystal display panel 50.

  On the other hand, the audio selector unit 41 that receives the audio data from the AV switch unit 21 and the audio data from the audio decoding unit 34 selects the audio data corresponding to the broadcast program to be reproduced from the two input audio data. And output to the audio output conversion device 100 (sound reproduction device). The audio output conversion device 100 converts the input audio data into a data format that can be reproduced by the speaker 60. In the audio output conversion apparatus 100, the converted audio data is reproduced by the speaker 60.

(Configuration of Audio Output Conversion Device 100)
Next, the configuration of an audio output conversion apparatus 100 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of the audio output conversion apparatus 100.

  As shown in the figure, the audio output conversion apparatus 100 includes an acoustic amplifying unit 110 (amplifying unit), a sound and music determining unit 120 (determining unit), and a control unit 130 (control unit).

(Operation of Audio Output Conversion Device 100)
The audio output conversion apparatus 100 inputs the audio data (acoustic signal) from the audio selector unit 41 to the acoustic amplifying unit 110 and the audio / music determination unit 120. The audio / music determination unit 120 to which the audio data is input determines whether the input audio data is data including sound, data including music, or other data. Next, the sound and music determination unit 120 uses the determination result as two binary signals of a sound flag indicating whether the audio data is sound data and a music flag indicating whether the audio data is music data. To the control unit 130. Here, if the audio / music determination unit 120 determines that the audio data is audio data, the audio flag is set to 1, and if it is determined to be data other than audio, the audio flag is set to 0 and is output to the control unit 130. To do. Furthermore, when the audio data determination unit 120 determines that the audio data is music data, the audio flag is set to 1, and when the audio data is determined to be data other than music, the music flag is set to 0 and is output to the control unit 130. .

  Here, the audio / music determination unit 120 includes an audio determination unit (audio determination unit) that determines whether or not the input audio data includes data, and a music determination unit that determines whether the input audio data includes data. ing. Further, the sound determination unit (music determination means) outputs a sound flag, and the music determination unit outputs a music flag.

  In the present embodiment, the method described in Patent Document 1 is used as the determination method in the sound and music determination unit 120, but the audio output conversion device 100 of the present invention is not limited to this. Any audio data can be used as long as it can be determined whether the audio data is voice, music, or other data.

  Furthermore, in the present embodiment, the determination result from the audio / music determination unit 120 is input to the control unit 130 as two signals of an audio flag and a music flag, but the present invention is not limited to this. Only one of the voice flag and the music flag may be input to the control unit 130. As an example, when the signal from the audio / music determination unit 120 is only the audio flag, when the audio flag is 1, it is determined that the audio data input to the audio output conversion device 100 is audio, When the voice flag is 0, it may be determined that the audio data is music. Alternatively, when the audio flag is 0, it may be determined that the audio data is other. On the contrary, when the signal from the audio / music determination unit 120 is only the music flag, when the music flag is 1, it is determined that the audio data input to the audio output conversion device 100 is music, When the music flag is 0, it may be determined that the audio data is voice. Alternatively, when the music flag is 0, it may be determined that the audio data is other.

  Next, when the audio flag is 1 and the music flag is 0, the control unit 130 recognizes that the audio data determination unit 120 determines that the input audio data is determined as audio data. To do. Furthermore, when the voice flag is 0 and the music flag is 1, the control unit 130 recognizes that the audio data determination unit 120 determines that the input audio data is music data. . When both the voice flag and the music flag are 0, or when both the voice flag and the music flag are 1, the control unit 130 determines that the input audio data is a voice in the voice / music determination unit 120. It is recognized as audio data that is neither data nor music data. Alternatively, the audio flag may be prioritized, and if both the audio flag and the music flag are 1, it may be determined that the audio data is audio. Alternatively, the music flag may be prioritized, and if both the voice flag and the music flag are 1, it may be determined that the audio data is music.

  Further, the audio output conversion apparatus 100 inputs the volume value for designating the output volume selected by the user who views the television 10 to the control unit 130.

  Here, based on the sound flag and the music flag, which are information of the determination result from the sound and music determination unit 120, and the volume value, the control unit 130 in the sound amplification unit 110 for each frequency of the sound included in the audio data. A control parameter for setting the amplification factor is generated. The control unit 130 outputs the generated control parameter to the sound amplification unit 110. The sound amplifying unit 110 that has received the control parameter from the control unit 130 adjusts a parametric equalizer (hereinafter referred to as PEQ) provided therein based on the input control parameter. Here, the sound amplifying unit 110 can control the amplification factor for each sound frequency included in the audio data by inputting the control parameter. That is, in terms of the amplification factor for the entire frequency range of sound, the amplification factor in the acoustic amplification unit 110 has frequency characteristics. A detailed description of the PEQ and the control parameter will be described later.

(State transition based on judgment result and volume value)
Next, the relationship between the determination result and volume value from the audio / music determination unit 120 and the amplification factor having frequency characteristics in the acoustic amplification unit will be described with reference to FIG. FIG. 3 is an explanatory diagram showing the relationship between the determination result from the sound and music determination unit 120 input by the control unit 130, the volume value input from the outside, and the amplification factor having frequency characteristics in the acoustic amplification unit 110. is there.

  As shown in the figure, when the TV 10 including the audio output conversion device 100 is turned on, the audio output conversion device 100 first sets the state of the amplification factor in the sound amplification unit 110 to the state 131B which is an initial state. . This state 131B is a state in which the amplification factor from the low range to the high range in the frequency of the sound included in the audio data is set to a constant frequency characteristic with respect to the audio data input by the sound amplification unit 110.

  In addition, the frequency of the sound included in the audio data is divided into three bands, and the low frequency, the middle frequency, and the high frequency are set in ascending order of frequency. Further, in the present embodiment, the middle range in the acoustic frequency is set to 200 Hz or more and less than 5 kHz, the high range is set to 5 kHz or more, and the low range is set to less than 200 Hz.

  Next, when the frequency characteristic of the amplification factor corresponding to the state 131B is shown in a graph, the characteristic graph 140B or 141B shown in the figure is obtained. The characteristic graph described below is a graph showing frequency characteristics corresponding to three types of volume values, with the horizontal axis representing frequency and the vertical axis representing amplification factor. The characteristic graph 140B or 141B has a constant amplification factor from low to high in the acoustic frequency included in the audio data, and corresponds to three types of volume values, large Vol, medium Vol, and small Vol. It shows that the amplification factor to be fixed is constant. In other words, the control unit 130 amplifies the sound in the sound amplification unit 110 so that the amplification rate from the low range to the high range is constant in the frequency of the sound included in the audio data, and the amplification rate corresponds to the input volume value. Control the rate. Note that the volume value in the present embodiment has three or more types of values. However, in the present specification, for convenience of explanation, the volume value input from the outside has a large sound output from the speaker. The following description will be made in a simplified manner with three types of volume values: a large Vol value, a Vol value that has a smaller sound size than the Vol value, and a small Vol value that has a smaller sound size than the Vol value.

  Next, the audio output conversion apparatus 100 inputs the audio data from the audio selector unit 41 (see FIG. 2) to the audio / music determination unit 120, and whether the audio included in the input audio data is music, audio, or otherwise. Determine whether. As described above, the sound and music determination unit 120 outputs the determination result to the control unit 130 using the sound flag and the music flag. When the input audio flag is 1 and the music flag is 0, the control unit 130 sets the control parameter to the acoustic amplification unit 110 so that the state of the amplification factor in the acoustic amplification unit 110 becomes the state 131A. Output to. When the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 131A is shown in a graph, a characteristic graph 140A or 141A is obtained. The frequency characteristics of the amplification factor shown in the characteristic graphs 140A and 141A are controlled by the control unit 130 so that the amplification factor in the middle band at the frequency of the audio data is higher than the amplification factor in the low band and the high band. Furthermore, the frequency characteristics of the amplification factors shown in the characteristic graphs 140A and 141A are such that the smaller the input volume value is, the larger the difference between the middle region amplification factor and the low region and high region amplification factors is. It is controlled by the control unit 130. In other words, the control unit 130 controls the sound amplifying unit 110 such that the lower the input volume value is, the more the midrange sound is emphasized than the low and high range sounds.

  As described above, when the sound flag from the sound and music determination unit 120 is 1 and the music flag is 0, in other words, when the sound included in the input audio data is determined to be sound, the volume The smaller the value, the more the main frequency band in human speech will be emphasized by enhancing the sound of 200 Hz to 5 kHz in the frequency of the audio data. As a result, even if the volume of the sound output from the speaker 60 is reduced, an effect is obtained that it becomes easy to hear the human voice as the output sound.

  Furthermore, as shown in the characteristic graphs 140A and 141A, when the volume value is large, the mid-range sound is amplified from the low range to the high range without emphasizing the low range and high range sounds. The control unit 130 controls the sound amplifying unit 110 according to the frequency characteristic that is a rate. In this way, when the volume value is large, the frequency characteristic that makes the amplification factor constant from the low range to the high range changes the sound quality of the human voice that occurs when the mid-range sound is emphasized. Can be prevented.

  Next, the frequency characteristic of the amplification factor in the acoustic amplification unit 110 when the control unit 130 inputs a determination result that the audio flag is 0 and the music flag is 1 from the audio / music determination unit 120 will be described.

  When the control unit 130 inputs a determination result that the sound flag is 0 and the music flag is 1 from the sound and music determination unit 120, the control unit 130 changes the state of the amplification factor in the sound amplification unit 110 to the state 131C. As such, the control parameter is output to the sound amplification unit 110. When the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 131C is shown in a graph, a characteristic graph 140C or 141C is obtained. The frequency characteristics of the amplification factors shown in the characteristic graphs 140C and 141C are controlled by the control unit 130 such that the low-frequency and high-frequency amplification factors are higher than the mid-frequency amplification factor at the acoustic frequency included in the audio data. Has been. Further, the frequency characteristics of the amplification factors shown in the characteristic graphs 140C and 141C indicate that the smaller the input volume value is, the lower frequency and higher frequency amplification factors and the middle frequency amplification factor in the acoustic frequency included in the audio data. It is controlled by the control unit 130 so that the difference from

  In general, music has a louder volume in the low and high frequencies in the acoustic frequency than human speech. The realism of the music depends on the volume of the low and high bands. Also, if the frequency characteristics of the sound pressure of the sound from the low range to the high range, in other words, the shape of the curve showing the sound pressure in the low range to the high range is the same, the smaller the sound pressure of the sound, the more human Because of its auditory characteristics, it is said that the low and high frequency bands feel less loud than the mid frequency band. Therefore, when the volume is small, when the user listens to the music, the volume of the low frequency band and the high frequency band is increased, thereby increasing the realism of the music.

  Here, when the sound flag from the sound / music determination unit 120 is 0 and the music flag is 1, in other words, when the sound included in the input audio data is determined to be music, audio output conversion is performed. The apparatus 100 emphasizes low and high frequency sounds in the frequency of audio data. This emphasizes the low and high frequencies of the music that is the sound output from the speaker 60. As a result, the audio output conversion apparatus 100 has an effect that even if the sound output from the speaker 60 is small, the music that is the output sound can be made music with a sense of presence.

  Next, the sound amplifying unit 110 when the control unit 130 inputs from the audio / music determination unit 120 a determination result that both the audio flag and the music flag are 0, or both the audio flag and the music flag are 1. The frequency characteristics of the amplification factor will be described.

  When the control unit 130 inputs a determination result that the sound flag and the music flag are both 0 or the sound flag and the music flag are both 1 from the sound and music determination unit 120, the control unit 130 receives the sound amplification unit 110. The control parameter is output to the acoustic amplification unit 110 so that the state of the amplification factor at becomes the state 131B. Note that the frequency characteristics of the amplification factors described in the characteristic graphs 140B and 141B corresponding to the state 131B are as described above.

  As described above, in the audio output conversion apparatus 100, the audio / music determination unit 120 determines whether the sound included in the input audio data is voice, music, or other, and the determination from the audio / music determination unit 120. Based on the result and the input volume value, the control unit 130 controls the amplification factor in the acoustic amplification unit 110.

  In the present embodiment, two characteristic graphs 140A and 141A are described as graphs indicating the frequency characteristics of the amplification factor corresponding to the state 131A. The difference between the two characteristic graphs is the difference between the case where the emphasis of the midrange of the frequency in the audio data is made stronger and the case where the enhancement is made weaker. In the characteristic graph 140 </ b> A, the smaller the volume value, the stronger the midrange sound is emphasized, and the human voice that is the sound output from the speaker 60 can be heard more easily. On the other hand, in the characteristic graph 141A, when the mid-range sound is emphasized, the degree of emphasis on the mid-range sound is set weaker than that in the characteristic graph 140A. Here, when the determination result in the sound and music determination device 120 is switched from sound to music, the frequency characteristic of the amplification factor in the sound amplification unit 110 is also switched. Therefore, when the frequency characteristic of the amplification factor in the sound amplification unit 110 is switched, the user who is listening to the sound output from the speaker 60 may feel uncomfortable. Here, as shown in the characteristic graph 141A, by setting the degree of emphasis on the mid-range sound to be weak, even when the frequency characteristic of the amplification factor in the sound amplification unit 110 is switched, the user feels uncomfortable feeling. Can do.

  Similarly, in the case of the state 131C, two characteristic graphs of characteristic graphs 140C and 141C are described as graphs indicating the frequency characteristics of the amplification factor corresponding to the state 131C. The difference between the two characteristic graphs is the difference between the case where the degree of emphasis on the low and high frequencies of the audio data is increased and the case where the frequency is weakened. In the characteristic graph 140C, the lower the volume value, the stronger the low and high frequency sounds are emphasized, and the music output from the speaker 60 can be made more realistic. On the other hand, in the characteristic graph 141C, in emphasizing the low-frequency and high-frequency sounds, the degree of emphasis on the low-frequency and high-frequency sounds is set weaker than that of the characteristic graph 140C. Here, as described above, when the determination result in the sound and music determination device 120 is switched from sound to music, the frequency characteristic of the amplification factor in the acoustic amplification unit 110 is also switched.

  Therefore, as shown in the characteristic graph 141C, the degree of emphasis on low-frequency and high-frequency sounds is set to be weak, so that even when the frequency characteristics of the amplification factor in the acoustic amplification unit 110 are switched, the user feels uncomfortable. Can be made.

  In the audio output conversion apparatus 100, the frequency characteristics of the amplification factor in the acoustic amplification unit 110 are the characteristics shown in the characteristic graphs 140A to 140C or the characteristics shown in the characteristic graphs 141A to 141C. What is necessary is just to determine by the specification etc. of the television 10 which mounts the output converter 100.

(Configuration of the acoustic amplification unit 110)
Hereinafter, the acoustic amplification unit includes a signal processing unit (equalizer) that performs signal processing by filter setting and a signal amplification unit (amplifier) that performs signal amplification.

  Next, the configuration of the acoustic amplification unit 110 will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A is an explanatory diagram showing a configuration in the case where the amplification factor of the signal amplification unit (fixed amplifier) is constant and the signal processing unit (equalizer) controls the volume including the frequency characteristics, and FIG. ) Is an explanatory diagram showing a configuration of the acoustic amplification unit 110b when the overall amplification factor is controlled by the signal amplification unit (variable amplifier) and the frequency characteristic is controlled by the signal processing unit (equalizer).

  The acoustic amplification unit 110a in FIG. 4A and the acoustic amplification unit 110b in FIG. 4B correspond to the acoustic amplification unit 110 shown in FIG.

  As shown in FIG. 5A, the acoustic amplifying unit 110a amplifies the audio data input to the acoustic amplifying unit 110a with an amplification factor having a predetermined frequency characteristic, and the audio from the equalizer 111. A D / A converter 113 that converts data into an analog audio signal and a fixed amplifier 112a that amplifies the analog audio signal from the D / A converter 113 with a fixed amplification factor are provided.

  In the present embodiment, the equalizer 111 is configured by a DSP (Digital Signal Processor), but the present invention is not limited to this, and may be configured by a semiconductor component other than the DSP.

(Operation of the sound amplification unit 110 in the case of digital volume)
Hereinafter, the operation of the acoustic amplification unit 110a when the volume value input by the control unit 130a is input as a digital signal will be described. In the following description, the control unit 130 when the input volume value is input as a digital signal is referred to as the control unit 130a.

  The sound amplification unit 110 a inputs the audio data from the audio selector unit 41 to the equalizer 111. Furthermore, the equalizer 111 receives a control parameter for determining an amplification factor having frequency characteristics for the input audio data from the control unit 130a. The equalizer 111 determines the amplification amount that determines the frequency characteristics of the amplification factor and the magnitude of the sound output from the speaker 60 based on the input control parameters.

  Specifically, when the control unit 130a inputs the audio flag 1 and the music flag 0 from the audio / music determination unit 120, the control unit 130a sends the equalizer 111 shown in FIG. As described in the characteristic graph 142A indicating the state of the frequency characteristic, in other words, the control parameter is output so as to obtain an amplification factor that emphasizes the mid-band in the acoustic frequency included in the audio data. Of the three amplification factors shown in the characteristic graph 142A, which amplification factor is to be determined is determined based on the volume value input by the control unit 130a. That is, as the input volume value is smaller, the control unit 130a has an amplification factor that emphasizes the middle band in the frequency of the sound included in the audio data more than the low band and the high band. As described above, the control parameter is output to the equalizer 111.

  Also, when the control unit 130a inputs the audio flag 0 and the music flag 1 from the audio / music determination unit 120, the control unit 130a transmits the frequency characteristics shown in FIG. As described in the characteristic graph 142B indicating the state, in other words, the control parameter is output so that the amplification factor emphasizes the low and high frequency bands in the acoustic frequency included in the audio data. Even in this case, the control unit 130a determines which of the three amplification factors shown in the characteristic graph 142B has the frequency characteristic, based on the input volume value. That is, as the input volume value is smaller, the control unit 130a has an amplification factor that emphasizes the low frequency band and the high frequency band in the frequency of the sound included in the audio data more than the middle frequency band. As described above, the control parameter is output to the equalizer 111. In the present embodiment, when the control unit 130a inputs 0 as the audio flag and 1 as the music flag from the audio / music determination unit 120, the control unit 130a includes the audio data with respect to the equalizer 111. The control parameters are output so that the low and high frequency bands are emphasized more than the mid frequency band, but only one of the low or high frequency bands is emphasized. May be output.

  Further, when the control unit 130a inputs a determination result that the sound flag and the music flag are both 0 or both the sound flag and the music flag are 1 from the sound and music determination unit 120, the control unit 130a receives the equalizer 111. On the other hand, as described in the characteristic graph 142C showing the state of the frequency characteristic shown in FIG. 4A, in other words, in the entire frequency band from low to high in the frequency of the sound included in the audio data, Control parameters are output so that the amplification factor has a constant frequency characteristic. In this case, the control unit 130a controls the control parameter so that the frequency characteristics of the gain of the entire band from the low frequency range to the high frequency are constant and the gain is based on the input volume value. Is output to the equalizer 111.

  The amplification factor having frequency characteristics in the equalizer 111 is an amplification factor that takes into account the frequency characteristics of the amplification factor and the amplification amount that determines the magnitude of the sound output from the speaker 60.

  The D / A converter 113 inputs the audio data amplified by the equalizer 111. The D / A converter 113 converts the audio data input from the equalizer 111 into an analog audio signal and outputs the analog audio signal to the fixed amplifier 112a. The fixed amplifier 112 a amplifies the amplitude of the analog audio signal input from the D / A conversion unit 113 for output to the speaker 60. Further, the fixed amplifier 112 a outputs the amplified analog audio signal to the speaker 60. The amplification factor in the fixed amplifier 112a is a fixed amplification factor, and is an independent amplification factor that is not based on the volume value input by the control unit 130 and the determination result from the sound and music determination unit.

(Operation of equalizer 111)
Here, control parameters from the control unit 130a and filter settings for the operation inside the equalizer 111 will be described with reference to FIGS. 5 (a) and 5 (b). In the case of the acoustic amplifying unit 110a, not only the filter setting but also the amplification amount for setting the overall gain is controlled, but this is omitted. FIG. 5A is an explanatory diagram for explaining a control parameter from the control unit, and FIG. 5B is an explanatory diagram showing an operation inside the equalizer 111.

  First, in the present embodiment, the equalizer 111 is a PEQ configured by a DSP. Therefore, the equalizer 111 includes a center frequency (hereinafter, referred to as f0) of a band handled by the equalizer 111, a bandwidth (hereinafter, referred to as Q) that determines a bandwidth from the center frequency, and an amplification level in the bandwidth Q. By inputting three parameters such as a gain level (hereinafter referred to as dBgain) for determining the gain, it is possible to determine an amplification factor having frequency characteristics in itself.

  As shown in FIG. 6A, the control unit 130 is three parameters constituting the control parameter based on the volume value input from the outside and the audio flag and the music flag from the audio / music determination unit 120. f0, Q, and dBgain are generated. The control unit 130 outputs the generated f0, Q, and dBgain to the equalizer 111.

  Next, the operation of the equalizer 111 to which the control parameters f0, Q, and dBgain are input will be described with reference to FIG.

The equalizer 111 includes a conversion table 114 therein. The equalizer 111 to which the control parameter from the control unit 130a is input converts the input f0, Q, and dBgain into five parameters a ₁ , a ₂ , b ₀ , b ₁ , and b ₂ by the conversion table 114. Here, the equalizer 111 performs acoustics included in the input audio data by the inverse Z transform of a plurality of layers and the five parameters a ₁ , a ₂ , b ₀ , b ₁ , b ₂ generated by the transform table 114. The amplification factor having frequency characteristics is determined.

Incidentally, f0, Q, the relationship between the DBgain, the five parameters _{a 1, a 2, b 0} , b 1, b 2 is as follows.
a ₁ = 2 × cos (w0) / (1 + sin (w0) / (2 × Q) / 10 ^{dBgain / 40} )
a ₂ = (− 1 + sin (w0) / (2 × Q) / 10 ^{dBgain / 40} ) / (1 + sin (w0) / (2 × Q) / 10 ^{dBgain / 40} )
b ₀ = (1 + sin (w0) / (2 × Q) × 10 ^{dBgain / 40} ) / (1 + sin (w0) / (2 × Q) / 10 ^{dBgain / 40} )
b ₁ = −2 × cos (w0) / (1 + sin (w0) / (2 × Q) / 10 ^{dBgain / 40} )
b ₂ = (1−sin (w0) / (2 × Q) × 10 ^{dBgain / 40} ) / (1 + sin (w0) / (2 × Q) / 10 ^{dBgain / 40} )
(Operation of acoustic amplification unit 110, analog volume)
Next, the operation of the acoustic amplification unit 110 when the volume value input by the control unit 130 is an analog signal will be described below with reference to FIG. In the following description, the control unit 130 when the input volume value is an analog signal is referred to as the control unit 130b. Further, in the following description, only a portion different from the operation of the acoustic amplification unit 110 when the volume value input by the control unit 130 is a digital signal will be described, and the description of the overlapping portions will be omitted.

  As shown in the figure, when the volume value input by the control unit 130b is an analog signal, the fixed amplifier 112a shown in FIG. 4A becomes the variable amplifier 112b. Thereby, the amplification amount that determines the magnitude of the sound output from the speaker 60 is determined by the amplification factor in the variable amplifier 112b. That is, when the signal amplification unit has a fixed amplification factor and the volume value input by the control unit 130b is a digital signal, the frequency characteristic of the amplification factor with respect to the sound included in the audio data and the magnitude of the sound output from the speaker 60 In order to control the amplification amount that determines the length, the control unit 130 a outputs a control parameter to the equalizer 111. On the other hand, when the signal amplification unit has a variable amplification factor, when the volume value input by the control unit 130b is an analog signal, the equalizer 111 determines only the frequency characteristic of the amplification factor for the sound included in the audio data. As described above, the control unit 130b outputs the control parameter to the equalizer 111.

  Specifically, when the control unit 130b receives the audio flag 1 and the music flag 0 from the audio / music determination unit 120, the control unit 130b transmits the equalizer 111 to the equalizer 111 as shown in FIG. As shown in the characteristic graph 143A showing the state of the frequency characteristic, in other words, the control parameter is output so as to emphasize the middle band in the frequency of the sound included in the audio data. Of the three amplification factors shown in characteristic graph 143A, which amplification factor is to be determined is determined by control unit 130b based on the input volume value. That is, as the input volume value is smaller, the control unit 130b has a frequency characteristic that emphasizes the middle band in the frequency of the sound included in the audio data more than the low band and the high band. As described above, the control parameter is output to the equalizer 111.

  Furthermore, when the control unit 130b inputs the audio flag 0 and the music flag 1 from the audio / music determination unit 120, the control unit 130b transmits the frequency characteristics shown in FIG. As described in the characteristic graph 143B indicating the state, in other words, the control parameter is output so as to emphasize the low frequency band and the high frequency band in the acoustic frequency included in the audio data. Note that, of the three amplification factors shown in the characteristic graph 143B, which amplification factor is to be determined is determined by the control unit 130b based on the input volume value. That is, as the input volume value is smaller, the control unit 130b has a frequency characteristic that emphasizes the low frequency band and the high frequency band in the frequency of the sound included in the audio data more than the middle frequency band. As described above, the control parameter is output to the equalizer 111.

  Further, when the control unit 130b inputs a determination result that the sound flag and the music flag are both 0 or both the sound flag and the music flag are 1 from the sound and music determination unit 120, the control unit 130b receives the equalizer 111. On the other hand, as described in the characteristic graph 143C showing the state of the frequency characteristic shown in FIG. 4B, in other words, in the entire frequency band from low to high in the frequency of the sound included in the audio data, The control parameters are output so that the frequency characteristics with a constant gain are obtained.

  As described above, when the volume value input by the control unit 130b is an analog signal, the purpose of the equalizer 111 is amplification having frequency characteristics so as to emphasize a specific band for the sound included in the audio data. Amplify by rate.

  On the other hand, for the amplification amount that determines the magnitude of the sound output from the speaker 60, the control unit 130b outputs the amplification amount based on the input volume value to the variable amplifier 112b. The variable amplifier 112b amplifies the amplitude of the analog audio signal from the D / A converter 113 based on the amplification amount input from the control unit 130b. Here, the amplification factor in the variable amplifier 112b based on the amplification amount that determines the magnitude of the sound output from the speaker 60 determines the magnitude of the sound output from the speaker 60, as shown in FIG. As shown in the characteristic graph 145, the amplification factor is constant from low to high with respect to sound. Note that the graphs showing the three amplification factors in the characteristic graph 145 correspond to three volume values input by the control unit 130b, ie, large Vol, medium Vol, and small Vol.

  As described above, when the volume value input by the control unit 130b is an analog signal, the equalizer 111 has an amplification having a frequency characteristic so as to emphasize a specific band for the sound included in the audio data. The variable amplifier 112b performs amplification to determine the magnitude of the sound output from the speaker 60, that is, the sound volume.

Hereinafter, the configurations shown in Reference Embodiments 1 and 2 are modifications of Embodiment 1. Specifically, the information input by the control unit is changed to various information.

In Reference Embodiments 1 and 2 , portions different from Embodiment 1 described above will be described, and overlapping members will be assigned member numbers in the same manner as Embodiment 1 and description thereof will be omitted.

[ Reference form 1 ]
An audio output conversion apparatus 200 according to a reference embodiment of the present invention will be described below with reference to FIGS.

(Configuration of Audio Output Conversion Device 200)
First, the configuration of the audio output conversion apparatus 200 will be described below with reference to FIG. FIG. 6 is a block diagram illustrating a configuration of the audio output conversion apparatus 200.

  As shown in the figure, the audio output conversion device 200 (sound reproduction device) includes a sound amplification unit 110 and a control unit 230 (control means, input means). Here, the audio output conversion device 200 is mounted on the television 10 (see FIG. 2), and the audio output conversion device 200 is replaced with the audio output conversion device 100 in the television 10.

(Operation of Audio Output Conversion Device 200)
The audio output conversion apparatus 200 inputs the audio data from the audio selector unit 41 (see FIG. 2) to the acoustic amplification unit 110. Furthermore, the audio output conversion apparatus 200 inputs the volume value of the sound output from the speaker 60 selected by the user who views the television 10 to the control unit 230. Here, it is assumed that the separation unit 32 (see FIG. 2) acquires PSI / SI information data from the digital broadcast signal demodulated by the digital demodulation unit 31 (see FIG. 2). Further, the separation unit 32 extracts information indicating the genre of the currently received broadcast program (hereinafter referred to as genre information) from the PSI / SI information data, and outputs the information to the audio output conversion device 200. The audio output conversion device 200 inputs the genre information from the separation unit 32 to the control unit 230.

  Next, the control unit 230 that has input the genre information determines which of the three groups the input genre information is a voice group, a music group, or any other group. To do. Specifically, the control unit 230 has three groups for each type of genre included in the PSI / SI information data: an audio group, a music group, and other groups. A correspondence table for determining which of these groups will be recorded. Based on the correspondence table, the control unit 230 determines which group the genre information input from the separation unit 32 is.

  Here, with reference to FIG. 7, an example of a correspondence table showing the relationship between the genre of broadcast program and the group in the control unit 230 will be described. FIG. 7 is an explanatory diagram illustrating an example of a correspondence table in the control unit 230.

As shown in the figure, in the correspondence table in the control unit 230, if the genre of the broadcast program is music or theater / performance, it becomes a group of music genres. Furthermore, in the correspondence table in the control unit 230, if the genre of the broadcast program is news / report, sports, information / wide show, drama, variety, movie, animation / special effects, documentary / education, hobby / education, welfare. It becomes a group of audio-related genres. Further, in the correspondence table in the control unit 230, if the genre of the broadcast program is other than that, it becomes a group of an unknown genre. Here, considering that the genre information of the broadcast program is extracted from the PSI / SI information data, the control unit 230 inputs the genre information only when a digital broadcast signal is received. Accordingly, in the present reference, when receiving the analog broadcast signal, in other words, if the genre information from the separation unit 32 is not inputted, the control unit 230, a broadcast program currently received, the unknown genre group It is determined that

  Note that the broadcast program genre and genre grouping shown in the correspondence table are merely examples, and it goes without saying that different groupings may be made based on the specifications of the audio output conversion apparatus 200 and the like. Further, the classification may be performed not only for voice and music systems, but also for more classifications, and the amplification factor may be determined for every genre.

  Next, the control unit 230 outputs a control parameter to the sound amplification unit 110 based on the input volume value and the genre group determined from the genre information. The operation in the acoustic amplification unit 110 to which the control parameter is input is as described in the first embodiment.

(State transition based on genre information and volume value)
Below, the relationship between the group and volume value of each genre by the control parameter from the control part 230 and the amplification factor which has the frequency characteristic in the acoustic amplification part 110 is demonstrated with reference to FIG. FIG. 8 is an explanatory diagram showing the relationship between the volume value input by the control unit 230 and the genre group determined from the genre information, and the amplification factor having frequency characteristics in the acoustic amplification unit 110.

  As shown in the figure, when the TV 10 equipped with the audio output conversion device 200 is turned on, the audio output conversion device 200 inputs the received broadcast program genre information from the separation unit 32. The audio output device 200 determines a genre group corresponding to the input genre information in the control unit 230 provided therein. Here, if the determined genre group is a voice genre group, the control unit 230 sets the control parameters to the acoustic amplification unit so that the state of the amplification factor in the acoustic amplification unit 110 becomes the state 231A. To 110. When the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 231A is shown in a graph, a characteristic graph 240A or 241A shown in FIG. In the frequency characteristics of the amplification factors shown in the characteristic graphs 240A and 241A, the smaller the input volume value is, the more the amplification factor of the middle region at the acoustic frequency included in the audio data is compared to the amplification factors of the low region and the high region. Is controlled by the control unit 230 so as to be higher. In other words, the control unit 230 controls the sound amplifying unit 110 such that the lower the input volume value is, the higher the middle band is than the low band and the high band.

  As described above, when the genre information input to the control unit 230 is an audio genre, the audio output conversion apparatus 200 determines that the input audio data is audio data by the control unit 230. . As described above, when it is determined that the audio data is audio data, the audio output conversion device 200 decreases the volume of the sound output from the speaker 60, so that the audio output frequency band is the frequency band of human sound. The midrange will be emphasized. As a result, even if the sound output from the speaker 60 becomes small, there is an effect that it is easy to hear human voice from the speaker 60.

  Next, when the control unit 230 determines that the genre group corresponding to the input genre information is a musical genre group, the control unit 230 displays the state of the amplification factor in the acoustic amplification unit 110. Then, the control parameters are output to the sound amplifying unit 110 so as to be in the state 231B. If the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 231B is shown in a graph, a characteristic graph 240B or 241B shown in FIG. The frequency characteristics of the amplification factors shown in the characteristic graphs 240B and 241B indicate that the lower the input volume value is, the lower the high frequency amplification factor and the high frequency amplification factor in the acoustic frequency included in the audio data. Is controlled by the control unit 230 so as to be higher. In other words, the control unit 230 controls the sound amplifying unit 110 so that the lower and higher frequency bands are emphasized than the middle frequency band as the input volume value becomes smaller.

  As described above, when the genre information input to the control unit 230 is a music genre, the audio output conversion apparatus 200 determines that the input audio data is music data. In this way, when it is determined that the audio data is audio data, the lower the sound and the higher the sound, the more the sound volume output from the speaker 60 becomes smaller. As a result, when the volume of the sound output from the speaker 60 is small, the audio output conversion device 200 suppresses a reduction in the sense of reality of the music output from the speaker 60.

Incidentally, in the present reference, the control unit 230, when it is determined the audio data and music data, the control unit 230, to the sound amplification section 110, the frequency of the audio included in the audio data, the low-pass Although the control parameter is output so that the high frequency band is emphasized more than the mid frequency band, the control parameter may be output so as to emphasize only one of the low frequency band and the high frequency band.

  Next, when the control unit 230 determines that the genre group corresponding to the input genre information is a group of another genre, the control unit 230 sets the state of the amplification factor in the acoustic amplification unit 110 as follows. The control parameters are output to the acoustic amplification unit 110 so as to be in the state 231C. If the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 231C is shown in a graph, a characteristic graph 240C or 241C is obtained. The frequency characteristics of the amplification factors shown in the characteristic graphs 240C and 241C are controlled by the control unit 230 so that the amplification factors from the low range to the high range are constant at the acoustic frequency included in the audio data.

  As described above, in the audio output conversion apparatus 200, the input genre information is determined as a genre group by the control unit 230, and the sound amplification unit 110 is based on the determined genre group and the input volume value. The gain having frequency characteristics is controlled. Furthermore, the audio output conversion device 200 is a case where the volume of the sound output from the speaker 60 is small by multiplying the sound included in the audio data from the audio selector unit 41 by an amplification factor having frequency characteristics. However, it is easy to hear the human voice, which is the output sound, and suppresses a reduction in the sense of reality of the music, which is the output sound.

In the present reference embodiment, the graph showing a frequency characteristic of the amplification factor corresponding to the state 231A, describes two characteristic graph of the characteristic graph 240A and 241A. The difference between the two characteristic graphs is the difference between the case where the emphasis of the midrange of the frequency in the audio data is made stronger and the case where the enhancement is made weaker. In the characteristic graph 240 </ b> A, the smaller the volume value, the stronger the midrange sound is emphasized, and the human voice that is the sound output from the speaker 60 can be heard more easily. On the other hand, in the characteristic graph 241A, when the mid-range sound is emphasized, the degree of emphasis on the mid-range sound is set weaker than that in the characteristic graph 240A. Here, broadcast genre information is set for each program. For example, even if there is music in a program whose genre is a drama, the genre information remains a drama. Therefore, if the emphasis is made too strong, the sense of reality of the music is very poor when the music is playing. Here, as shown in the characteristic graph 241A, by setting the degree of emphasis on the mid-range sound to be weak, the lack of realism when music is playing in the program of the group whose genre is audio is reduced. be able to.

  In addition, two characteristic graphs of characteristic graphs 240B and 241B are shown as graphs showing the frequency characteristics of the amplification factor corresponding to the state 231B. The difference between the two characteristic graphs is the difference between the case where the degree of emphasis on the low and high frequencies of the audio data is increased and the case where the frequency is weakened. In the characteristic graph 240B, the lower the volume value, the stronger the low-frequency and high-frequency sounds are emphasized, and the music output from the speaker 60 can be made more realistic. On the other hand, in the characteristic graph 241B, in emphasizing the low-frequency and high-frequency sounds, the degree of emphasis on the low-frequency and high-frequency sounds is set weaker than that of the characteristic graph 240B. Here, broadcast genre information is set for each program. For example, even when there is a talk in a program whose genre is music, the genre information remains music. Therefore, if the emphasis is too strong, it becomes very difficult to hear human voice in the case of talk. Here, as in the characteristic graph 241B, by setting the degree of emphasis on low-frequency and high-frequency sounds to be weak, it is difficult to hear a human voice when there is a talk in a program of a group whose genre is music. Can be reduced.

  Furthermore, since the control parameter output from the control unit 230 to the sound amplification unit 110 has the same configuration as the control parameter output from the control unit 130 described in the first embodiment, the description thereof is omitted here.

[ Reference form 2 ]
An audio output conversion apparatus 300 according to the second reference embodiment of the present invention will be described below with reference to FIGS.

(Configuration of Audio Output Conversion Device 300)
First, the configuration of the audio output conversion apparatus 300 will be described below with reference to FIG. FIG. 9 is a block diagram illustrating a configuration of the audio output conversion apparatus 300.

  As shown in the figure, the audio output conversion device 300 (sound reproduction device) includes an acoustic amplification unit 110, a sound and music determination unit 120, and a control unit 330. Here, the audio output conversion device 300 is mounted on the television 10 (see FIG. 2), and the audio output conversion device 300 is replaced with the audio output conversion device 100 in the television 10.

(Operation of Audio Output Conversion Device 300)
The audio output conversion apparatus 300 inputs the audio data from the audio selector unit 41 (see FIG. 2) to the acoustic amplification unit 110 and the audio / music determination unit 120. Here, the audio / music determination unit 120 determines whether the input audio data is data including audio, data including music, or other data, and the determination result is expressed as two signals of an audio flag and a music flag. Therefore, the data is output to the control unit 330. Note that since the audio / music determination unit 120 has already been described in the first embodiment, a detailed description thereof will be omitted here.

Furthermore, the audio output conversion device 300 inputs the volume value of the output volume selected by the user who views the television 10 to the control unit 330. Similarly to the reference mode 1 described above, the audio output conversion device 300 inputs the genre information of the currently received broadcast program from the separation unit 32 to the control unit 330. Here, the control unit 330 determines which of the three groups the input genre information is a voice group, a music group, or any other group. Operation and methods of determination for the genre information is the same as Reference Embodiment 1, a description thereof will be omitted.

  Next, the control unit 330 generates a control parameter based on the input volume value, the determination result from the sound and music determination unit 120, and the genre group for which the genre information has been determined, and the control parameter is used as the sound amplification unit To 110. The operation in the acoustic amplification unit 110 to which the control parameter is input is as described in the first embodiment.

(State transition based on volume value, genre information, and judgment result)
Hereinafter, the amplification factor in the acoustic amplification unit 110 based on the control parameter from the control unit 330 will be described with reference to FIG. FIG. 10 is an explanatory diagram showing a relationship between a volume value input by the control unit 330, a group of genre information, a determination result from the sound and music determination unit 120, and an amplification factor having frequency characteristics in the acoustic amplification unit 110. .

  As shown in the figure, when the TV 10 equipped with the audio output conversion device 300 is turned on, the audio output conversion device 300 inputs the received broadcast program genre information from the separation unit 32. The audio output device 300 determines a genre group corresponding to the input genre information in the control unit 330 provided therein.

(When genre information is an audio genre)
Here, if the determined genre group is a voice genre group, the control unit 330 sets the control parameters to the acoustic amplification unit so that the state of the amplification factor in the acoustic amplification unit 110 becomes the state 331A. To 110. If the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 331A is shown in a graph, a characteristic graph 340A shown in FIG. In the frequency characteristic of the amplification factor shown in the characteristic graph 340A, the smaller the input volume value is, the higher the amplification factor in the middle region at the acoustic frequency included in the audio data is than the amplification factor in the low region and the high region. It is controlled by the control part 330 so that it may become. In other words, the control unit 330 controls the sound amplifying unit 110 such that the lower the input volume value is, the higher the middle band is than the low band and the high band.

  Here, when the control unit 330 inputs a determination result that the sound flag is 0 and the music flag is 1 from the sound and music determination unit 120, the control unit 330 determines the state of the amplification factor in the sound amplification unit 110. The control parameters are output to the sound amplification unit 110 so as to be in the state 332B. A graph indicating the frequency characteristic of the amplification factor corresponding to this state 332B is a characteristic graph 341B. In the frequency characteristic of the amplification factor shown in the characteristic graph 341B, the lower the input volume value is, the higher the low frequency and high frequency amplification factors in the acoustic frequency included in the audio data are than the middle frequency amplification factor. It is controlled by the control part 330 so that it may become. In other words, the control unit 330 controls the sound amplifying unit 110 so that the lower and higher frequency bands are more emphasized than the middle frequency band as the input volume value becomes smaller.

  When the control unit 330 determines that the input genre information is a group of audio genres, the determination result from the audio / music determination unit 120 is that the audio flag is 0 and the music flag is 1. In this case, the state of the amplification factor in the sound amplification unit 110 becomes the state 332B, and when the determination result from the sound and music determination unit 120 is that the sound flag is 0 and the music flag is other than 1, the state of the amplification factor in the sound amplification unit 110 Becomes state 331A.

(When genre information is a music genre)
Next, the state of the amplification factor in the acoustic amplification unit 110 when the input genre information in the control unit 330 is a group of genres of music type will be described.

  When the control unit 330 determines that the input genre information is a group of music genres, the control unit 330 sets the control parameters to the sound amplification unit 110 so that the state of the amplification factor in the sound amplification unit 110 becomes the state 331B. Output. If the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 331B is shown in a graph, a characteristic graph 340B shown in FIG. In the frequency characteristic of the amplification factor shown in the characteristic graph 340B, the smaller the input volume value is, the higher the low frequency and high frequency amplification factors in the acoustic frequency included in the audio data are higher than the middle frequency amplification factor. It is controlled by the control part 330 so that it may become. In other words, the control unit 330 controls the sound amplifying unit 110 so that the lower and higher frequency bands are more emphasized than the middle frequency band as the input volume value becomes smaller.

  Here, when the control unit 330 inputs a determination result that the sound flag is 1 and the music flag is 0 from the sound and music determination unit 120, the control unit 330 determines the state of the amplification factor in the sound amplification unit 110. The control parameters are output to the sound amplification unit 110 so as to be in the state 332A. A graph showing the frequency characteristic of the amplification factor corresponding to this state 332A is a characteristic graph 341A. In the frequency characteristic of the amplification factor shown in the characteristic graph 341A, the smaller the input volume value is, the higher the amplification factor of the middle region at the acoustic frequency included in the audio data is higher than the amplification factor of the low region and the high region. As described above, the control is performed by the control unit 330. In other words, the control unit 330 controls the sound amplifying unit 110 such that the lower the input volume value is, the higher the middle band is than the low band and the high band.

  When the control unit 330 determines that the input genre information is a musical genre group, the determination result from the audio / music determination unit 120 is that the audio flag is 1 and the music flag is 0. In this case, the state of the amplification factor in the acoustic amplification unit 110 is in the state 332A, and when the determination result from the speech / music determination unit 120 is that the speech flag is 1 and the music flag is other than 0, the amplification factor state in the acoustic amplification unit 110 Becomes state 331B.

(When the genre information is a genre that is neither voice nor music)
Next, the state of the amplification factor in the acoustic amplifying unit 110 when the input genre information in the control unit 330 is a genre group that is neither voice nor music will be described.

  When the control unit 330 determines that the input genre information is a genre group that is neither a voice system nor a music system, the control unit 330 sets the control parameter to the acoustic parameter so that the state of the amplification factor in the acoustic amplification unit 110 becomes the state 331C. Output to the amplifying unit 110. If the frequency characteristic of the amplification factor in the acoustic amplification unit 110 corresponding to this state 331C is shown in a graph, a characteristic graph 340C shown in FIG. The frequency characteristic of the amplification factor shown in the characteristic graph 340C is controlled by the control unit 330 so that the amplification factor from the low range to the high range is constant at the acoustic frequency included in the audio data. That is, the control unit 330 controls the sound amplifying unit 110 so as to have frequency characteristics that do not emphasize a specific band in the sound frequency included in the audio data.

  Here, when the control unit 330 inputs a determination result that the sound flag is 1 and the music flag is 0 from the sound and music determination unit 120, the control unit 330 determines the state of the amplification factor in the sound amplification unit 110. The control parameters are output to the sound amplification unit 110 so as to be in the state 333A. A graph indicating the frequency characteristic of the amplification factor corresponding to this state 333A is a characteristic graph 342A. The frequency characteristic of the amplification factor shown in the characteristic graph 342A indicates that the smaller the input volume value is, the higher the amplification factor of the middle region at the acoustic frequency included in the audio data is higher than the amplification factor of the low region and the high region. As described above, the control is performed by the control unit 330. In other words, the control unit 330 controls the sound amplifying unit 110 such that the lower the input volume value is, the higher the middle band is than the low band and the high band.

  On the other hand, when the control unit 330 inputs from the sound and music determination unit 120 a determination result that the sound flag is 0 and the music flag is 1, the control unit 330 changes the state of the amplification factor in the sound amplification unit 110 to the state. The control parameter is output to the acoustic amplification unit 110 so as to be 333B. A graph showing the frequency characteristic of the amplification factor corresponding to this state 333B is a characteristic graph 342B. In the frequency characteristic of the amplification factor shown in the characteristic graph 342B, the smaller the input volume value is, the higher the amplification factor of the low frequency and the high frequency in the acoustic frequency included in the audio data is higher than the amplification factor of the middle frequency. It is controlled by the control part 330 so that it may become. That is, as the input volume value becomes smaller, the control unit 330 controls the sound amplification unit 110 so as to emphasize the low frequency band and the high frequency band than the middle frequency band.

  When the control unit 330 determines that the input genre information is a genre group that is neither voice nor music, the determination result from the sound and music determination unit 120 is that the sound flag is 1 and the music flag is Is 0, the state of the amplification factor in the sound amplification unit 110 is the state 333A, and when the determination result from the sound and music determination unit 120 is that the sound flag is 0 and the music flag is 1, the sound amplification factor 110 The state of the gain in the state is state 333B, and when the determination result from the sound and music determination unit 120 is that both the sound flag and the music flag are 0, or both the sound flag and the music flag are 1, the amplification in the sound amplification unit 110 The rate state is state 331C.

  Further, comparing the frequency characteristics of the amplification factor when the same volume value is input in the characteristic graphs 341B and 342B and the characteristic graph 340B, the frequency characteristic of the amplification factor in the characteristic graph 340B is lower and higher. The band is more emphasized.

  Further, when comparing the frequency characteristics of the amplification factor when the same volume value is input in the characteristic graphs 341A and 342A and the characteristic graph 340A, the frequency characteristic of the amplification factor in the characteristic graph 340A has a higher frequency band. , Has become more emphasized.

  As described above, in the audio output conversion device 300, the frequency characteristic of the amplification factor in the acoustic amplification unit 110 is controlled based on the volume value, the sound and music determination unit 120, and the genre information. Even when the volume of the sound output from 60 is small, it is easy to hear the human voice that is the output sound, and it is possible to suppress a decrease in the sense of reality of the music that is the output sound.

In this reference embodiment, when the control unit 330 inputs 0 from the audio / music determination unit 120 and 1 from the music flag, the control unit 330 sends audio data to the sound amplification unit 110. The control parameters are output so that the low and high frequency bands in the sound frequency included in the are emphasized from the mid frequency band, but only one of the low or high frequency bands is emphasized. Control parameters may be output.

Note that the control parameter output from the control unit 330 to the sound amplification unit 110 has the same configuration as the control parameter output from the control unit 130 described in the first embodiment, and thus the description thereof is omitted in the reference mode 2 . .

  Although omitted in FIG. 10, when the program changes due to the switching of the program or the channel change in each of the above states, the genre determination operation is performed in the same manner as when the power is turned on. In addition, an operation is performed in real time on the input voice flag and music flag. Here, the frequency characteristic may be gradually increased or decreased in order to reduce a sense of incongruity when the state is switched.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention relates to an audio reproducing apparatus for amplifying an acoustic signal at a predetermined amplification factor, and capable of controlling the frequency characteristic of the amplification factor based on the type of sound included in the acoustic signal and the volume value selected by the user. In particular, it can be used in devices that output audio, such as mobile phones and liquid crystal televisions.

It is a block diagram which shows the structure of the audio output conversion apparatus based on one Embodiment of this invention. It is a block diagram which shows the structure of the television which mounts the audio output conversion apparatus based on one Embodiment of this invention. It is explanatory drawing which shows the frequency characteristic of the amplification factor in the acoustic amplification part based on one Embodiment of this invention. (A) And (b) is a block diagram which shows the structure of the acoustic amplification part based on one Embodiment of this invention. (A) is explanatory drawing which shows the control parameter which the control part which concerns on one Embodiment of this invention outputs, (b) is explanatory drawing which shows the structure of the equalizer based on Embodiment of this invention It is. It is a block diagram which shows the structure of the audio output conversion apparatus based on the reference form of this invention. It is explanatory drawing which shows the group division of the genre of a broadcast program based on the reference form of this invention. It is explanatory drawing which shows the frequency characteristic of the amplification factor in the acoustic amplification part based on the reference form of this invention. It is a block diagram which shows the structure of the audio output conversion apparatus based on the further another reference form of this invention. It is explanatory drawing which shows the frequency characteristic of the amplification factor in the acoustic amplification part based on the further another reference form of this invention.

100 Audio output conversion device (sound reproduction device)
110 Sound amplification part (amplification means)
110a Sound amplification part (amplification means)
110b Sound amplification part (amplification means)
120 voice and music determination unit (determination means)
130 Control part (control means)
130a Control unit (control means)
130b Control unit (control means)
200 Audio output conversion device (sound reproduction device)
230 Control unit (control means)
300 Audio output conversion device (sound reproduction device)
330 Control unit (control means)

Claims (4)

Amplifying means for amplifying the input acoustic signal at a predetermined amplification factor for each frequency of the acoustic signal;
Control means for controlling the amplification factor for each frequency;
A sound reproduction apparatus comprising: a determination unit that determines a type of the sound signal ;
The control means includes
Based on the volume value specified from the outside and information for identifying the type of the acoustic signal, the amplification factor is controlled for each frequency ,
The determination means is
Voice determination means for determining whether the acoustic signal is a voice signal;
Music determination means for determining whether the acoustic signal is a music signal,
When the sound determination means determines that the sound signal is a sound signal and the music determination means determines that the sound signal is a music signal, or the sound determination means determines that the sound signal is When it is determined that the sound signal is not a sound signal and the music determination means determines that the acoustic signal is not a music signal, the determination means determines that the sound signal is not a music signal or a sound signal. It is determined that the signal is
When the determination means determines that the acoustic signal is another signal, and the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order, the control The means controls the amplification factor so that the amplification factors of the low range, the mid range, and the high range are constant . When the determination means determines that the acoustic signal is an audio signal,
When the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order,
The control means includes
The amplification factor of the middle region is larger than the amplification factor of the low region and the high region,
The amplification factor is controlled such that the smaller the volume value is, the larger the difference between the amplification factor of the low band and the high band and the amplification factor of the middle band is. sound reproducing apparatus according to 1. When the determination means determines that the acoustic signal is a music signal,
When the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order,
The control means includes
The amplification factor of at least one of the low band or the high band is larger than the amplification factor of the middle band,
The amplification factor is controlled so that the smaller the volume value is, the larger the difference between the amplification factor of at least one of the low band and the high band and the amplification factor of the middle band becomes larger. The sound reproducing device according to claim 1 , wherein: An amplification step of amplifying the input acoustic signal by a predetermined amplification factor for each frequency of the acoustic signal;
A control step for controlling the amplification factor for each frequency;
A determination step of determining the type of the acoustic signal, and a sound reproduction method comprising:
In the control step, based on the volume value designated from the outside and information for identifying the type of the acoustic signal, the amplification factor is controlled for each frequency ,
The determination step includes
A sound determination step for determining whether the acoustic signal is a sound signal;
A music determination step of determining whether the acoustic signal is a music signal,
In the sound determination step, the sound signal is determined to be a sound signal, and in the music determination step, the sound signal is determined to be a music signal, or in the sound determination step, the sound signal Is determined not to be a sound signal, and in the music determination step, the sound signal is determined not to be a music signal, the sound signal is not a music signal or a sound signal in the determination step. Determine that it is another signal,
When it is determined in the determination step that the acoustic signal is another signal, and the frequency band of the acoustic signal is divided into three bands of low frequency, middle frequency, and high frequency in ascending order, the control In the step, the amplification factor is controlled so that the amplification factors of the low band, the middle band, and the high band are constant .

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