JP2011205687A - Audio regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an audio regulator capable of regulating a sound given by a sound creator to impressively transmit the regulated sound to a user and to give the sense of presence to the user.SOLUTION: The audio regulator is preferably applied to an audio system or the like, and includes a sound analysis module, a control module and a regulation module. The sound analysis module performs a sound analysis in real time based on an inputted sound signal. The control module generates a control signal for regulating the sound signal on the basis of sound analysis information obtained from the analysis by the sound analysis module and a volume level designated by the user. The regulation module regulates the sound signal in consideration of at least one of spatial impression, the clarity of words and a feeling of massiveness in a low-pitched sound on the basis of the control signal, and outputs the regulated sound signal. Here, the control module varies the regulation amount by the regulation module based on a signal level of the sound signal and the volume level.

Description

  The present invention relates to an audio adjustment device that adjusts audio in an audio system including a plurality of speakers.

  An audio system that provides a high-quality sound field space with multiple speakers automatically creates an appropriate sound field space that provides a sense of realism, more specifically, the sound expressed by the sound creator. It is required to convey it to the user in an impressive manner. Here, in order to reproduce the sound expressed by the sound creator, for example, in the case of a THX (registered trademark) certified AV amplifier, viewing with a volume level of 0 dB is recommended. However, in an actual home theater environment, since the volume is too high, it is actually being viewed at a volume lower than 0 dB. For this reason, in the environment of a home theater, the sound and impression intended by the sound creator may change.

  Therefore, for example, in Patent Document 1 below, when the volume is reduced by the volume adjusting device, the reflected sound and the like are emphasized, and the low frequency range and the high frequency range of the sound audible to the human ear are emphasized. Thus, a technique for performing realistic sound reproduction even at a low volume is described. Patent Document 2 discloses sound quality / sound field adjustment means for obtaining type information from header information of a management information file or a content data file and adding a setting value associated with the type information to a sound quality adjustment or a sound field effect. The method of automatically setting is described.

JP-A-9-65496 JP 2006-108843 A

  By the way, in the method described in Patent Document 1, the reflected sound and the frequency characteristics are adjusted according to the volume level adjusted by the volume control device, that is, according to the volume level designated by the user. For this reason, if the volume level is low even if the level of the input signal is large, the reflected sound and the frequency characteristics are adjusted, which may cause an excessive acoustic effect. Further, if the volume level is high even if the level of the input signal is small, the reflected sound and the frequency characteristics are not adjusted, and there is a possibility that the sense of reality is impaired. On the other hand, in the method described in Patent Document 2, since the same setting value is always applied in the same content, it is difficult to perform adjustment according to the scene in the same content.

  Examples of problems to be solved by the present invention include the above. It is an object of the present invention to provide an audio adjustment device that can transmit sound expressed by a sound creator to an impressive user and adjust it so as to obtain a sense of reality.

  The invention according to claim 1 is a voice adjusting device, wherein voice analysis means for analyzing voice in real time based on an input voice signal, voice analysis information analyzed by the voice analysis means, and a user Control means for generating a control signal for adjusting the sound signal based on the volume level indicated by the sound level, and for the sense of breadth, clarity of speech and volume of the bass based on the control signal. Adjusting means for adjusting and outputting the signal, wherein the control means changes the adjustment amount of the audio signal based on the signal level of the audio signal and the volume level.

It is a block diagram which shows the structure of the audio system provided with the audio | voice adjustment apparatus which concerns on 1st Example. It is a schematic diagram which shows an example of a listening room. It is a block diagram which shows the structure of the signal processing circuit in 1st Example. It is a block diagram which shows the structure of an audio | voice analysis part. It is a block diagram which shows the structure of a breadth degree analysis part. It is a block diagram which shows the structure of the front-back balance analysis part. It is a block diagram which shows the structure of a serif ratio analysis part. An example of the frequency characteristic of a filter bank is shown. It is a block diagram which shows the structure of a signal level analysis part. It is a graph which shows the relationship between playback volume and adjustment amount. It is a block diagram which shows the structure of the audio system provided with the audio | voice adjustment apparatus which concerns on 2nd Example. It is a block diagram which shows the structure of the signal processing circuit in 2nd Example. It is a block diagram which shows the structure of the signal processing circuit in 3rd Example. It is a block diagram which shows the structure of an audio | voice analysis part. It is a block diagram which shows the structure of a breadth degree analysis part. It is a block diagram which shows the structure of the signal processing circuit in the application example of 3rd Example.

21 Voice analysis unit 22 Control unit 23 Spreading feeling adjustment unit 24 Serif clarity feeling adjustment unit 25 Low volume feeling adjustment unit

  In one aspect of the present invention, the voice adjustment device is instructed by a user, voice analysis means for analyzing voice in real time based on an input voice signal, analysis information of the voice analyzed by the voice analysis means, and the voice analysis means. Control means for generating a control signal for adjusting the audio signal based on the volume level, and adjusting the audio signal for a sense of breadth, clarity of speech and volume of bass based on the control signal. Adjusting means for outputting, and the control means changes the adjustment amount of the audio signal based on the signal level of the audio signal and the volume level.

  The above sound adjustment device is suitably applied to an audio system or the like, and includes sound analysis means, control means, and adjustment means. The voice analysis means analyzes the voice in real time based on the input voice signal. The control means generates a control signal for adjusting the sound signal based on the analysis information of the sound analyzed by the sound analysis means and the volume level instructed by the user. The adjusting means adjusts and outputs the audio signal based on the control signal with respect to a sense of breadth, clarity of speech, and volume of bass. Here, the control means changes the adjustment amount by the adjustment means based on the signal level of the audio signal and the volume level. By doing in this way, the sound expressed by the sound creator can be transmitted to the user in an impressive manner, and a sense of reality can be obtained. In particular, by changing the adjustment amount based on the signal level and volume level of the audio signal, the sound can be transmitted to the user in an impressive manner regardless of the volume that the actual user listens to.

  In a preferred embodiment of the audio adjusting device, the control means increases the adjustment amount of the audio signal as a reproduction volume obtained by integrating the signal level of the audio signal and the volume level decreases. .

  Another aspect of the sound adjustment apparatus includes a detection unit that detects ambient illuminance, and the control unit is based on the illuminance detected by the detection unit, the signal level of the audio signal, and the volume level. The control signal is generated, and the adjusting means adjusts and outputs the audio signal based on the control signal. By doing so, the sound can be transmitted to the user in an impressive manner regardless of the brightness of the place where the user listens.

  In another aspect of the sound adjustment device, the sound analysis unit may determine whether the sound is spread left or right based on a difference between the signal obtained by adding the left sound signal and the signal obtained by adding the right sound signal. The control means generates the control signal for adjusting the audio signal based on the signal level of the audio signal, the volume level, and the spread degree information. By doing in this way, an adjustment means can adjust appropriately a feeling of breadth and the volume feeling of a low tone.

  In another aspect of the sound adjustment device, the sound analysis unit may be configured based on a difference between a signal obtained by converting a front sound signal into an absolute value and averaging it and a signal obtained by converting a rear sound signal into an absolute value and averaging it. Calculating front and rear balance information indicating a balance between front and rear voices, and the control means adjusts the voice signal based on a signal level of the voice signal, the volume level, and the front and rear balance information. Generate a signal. By doing in this way, an adjustment means can adjust appropriately the balance of the feeling of spreading in the front and back.

  In another aspect of the sound adjustment device, the sound analysis unit calculates line rate information indicating a rate of lines in the sound based on a level for each frequency band of the central sound signal, and the control unit includes: The control signal for adjusting the audio signal is generated based on the audio level of the audio signal, the volume level, and the speech ratio information. By doing in this way, the adjustment means can effectively clarify the lines.

  According to another aspect of the sound adjustment device, the speech ratio information indicating a speech ratio is calculated based on the spread degree information, and the control unit is configured to calculate the signal level, the volume level, and the speech level of the sound signal. The control signal for adjusting the audio signal is generated based on the ratio information. By doing in this way, even when there is no central audio signal, for example, even when the audio signal has two channels, the adjusting means can effectively clarify the lines.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[First embodiment]
FIG. 1 is a block diagram illustrating a configuration of an audio system including an audio adjusting device according to the first embodiment.

  The audio system 100 is a multi-channel audio system, and audio signals SFL, SFR, SSL, SSR, SSBL, SSBR, SC, and the like are transmitted from a sound source 1 such as a DVD player, an HDD player, or a BD player through a multi-channel signal transmission path. A signal processing circuit 2 to which SLFE is input is provided. The signal processing circuit 2 is included in an AV amplifier or an AV system including an AV amplifier. The signal processing circuit 2 corresponds to the sound adjustment device in the present invention.

  Further, the audio system 100 includes D / A converters 4FL to 4LFE that convert the digital outputs DFL to DLFE that are signal-processed and output for each channel by the signal processing circuit 2 into analog signals, and these D / A converters 4FL. Amplifiers 5FL to 5LFE for amplifying the analog audio signals output from the 4LFE. In the audio system 100, the analog audio signals SPFL to SPLFE amplified by these amplifiers 5 are supplied to a plurality of channels of speakers 6FL to 6LFE arranged in the listening room 10 as illustrated in FIG. It has become.

  Further, the audio system 100 includes a microcomputer 7 connected to the signal processing circuit 2 and an input unit 8 connected to the microcomputer 7. The input unit 8 is a device that is operated when a user gives instructions, inputs, and the like to the signal processing circuit 2. For example, various buttons provided on a front panel of a main body such as an AV amplifier including the signal processing circuit 2, It can be a remote control or the like. For example, when the user designates the volume level from the input unit 8, the microcomputer 7 outputs the designated volume level Volp as a signal to the signal processing circuit 2.

  Here, the audio system 100 has full-band speakers 6FL, 6FR, 6C, 6SL, and 6SR having frequency characteristics that can be reproduced over almost the entire audio frequency band, and frequency characteristics for reproducing only so-called deep bass. The low-frequency reproduction dedicated speaker 6LFE and the surround back speakers 6SBL and 6SBR arranged behind the user are sounded.

  More specifically, as shown in FIG. 2, for example, as shown in FIG. 2, the left and right two-channel front speakers (front left speaker, front right speaker) 6FL, 6FR and the center speaker 6C are arranged. In addition, two left and right channel surround speakers (rear left speaker and rear right speaker) 6SL and 6SR and two right and left channel surround back speakers 6SBL and 6SBR are arranged at the rear of the user. Of subwoofer 6LFE. The audio adjustment device provided in the audio system 100 supplies analog sound signals SPFL to SPLFE adjusted in frequency characteristics and the signal level of each channel to these eight speakers 6FL to 6LFE, and makes them sound realistic. A certain sound field space is realized.

  In the following description, “audio signal S” indicates audio signals SFL to SLFE of all channels. In the following, “left audio signal” indicates audio signals SFL, SSL, SSBL output to the left speaker of the user, and “right audio signal” indicates audio output to the right speaker of the user. Signals SFR, SSR, SSBL shall be indicated. The “front audio signal” indicates audio signals SFL, SFR, SC output to the user's front speaker, and the “rear audio signal” indicates the audio signal output to the user's rear speaker. SSL, SSR, SSBL, SSBR shall be indicated.

  Next, the configuration of the signal processing circuit 2 will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the signal processing circuit 2. In FIG. 3, audio signals are indicated by solid lines, and signals such as control signals other than audio signals are indicated by broken lines.

  The signal processing circuit 2 is formed by a digital signal processor (DSP) or the like. As shown in FIG. 3, the signal processing circuit 2 is roughly divided into a voice analysis unit 21, a control unit 22, a spread feeling adjustment unit 23, and the like. The speech clarity adjusting unit 24 and the low volume feeling adjusting unit 25 are configured.

  The sound analysis unit 21 receives sound signals S of all channels from the sound source 1. The voice analysis unit 21 analyzes the voice in real time based on the input voice signal S, and outputs a signal indicating various analysis information of the resulting voice to the control unit 22. As analysis information, spread degree information Winf indicating the degree of spread of the voice, front / rear balance information FBinf indicating the balance of the voice before and after the user, serif ratio information CXinf indicating the ratio of the serif in the voice, and the signal level of the voice signal S Signal level information SigLev is shown.

  The control unit 22 generates various control signals for adjusting the audio signal S based on the various analysis information input from the audio analysis unit 21 and the volume level Volp input from the microcomputer 7. This is output to the expansive feeling adjusting unit 23, the serif clarity adjusting unit 24, and the low volume feeling adjusting unit 25.

  Specifically, the control unit 22 generates the spread feeling control signal Wct for adjusting the spread feeling of the sound based on the spread degree information Winf, the signal level information SigLev, and the volume level Volp, and the spread feeling adjustment section. To 23. Further, the control unit 22 generates a front / rear balance control signal FBct for adjusting the balance of the front / rear feeling of the user based on the front / rear balance information FBinf, the signal level information SigLev, and the volume level Volp, thereby adjusting the spread feeling. To the unit 23.

  The spread feeling adjusting unit 23 adjusts the spread feeling by adjusting the audio signals SFL, SFR, SSL, SSR, SSBL, and SSBR in accordance with the spread feeling control signal Wct. As the spaciousness adjustment processing, for example, wide stereo processing or reflected sound / reverberation sound addition processing can be applied. Here, the “expansion feeling” means “a feeling of envelopment (so-called surround)”. Further, the spread feeling adjustment unit 23 adjusts the balance of the spread feeling in the front and rear of the user by adjusting the audio signals SFL, SFR, SSL, SSR, SSBL, and SSBR in accordance with the front-rear balance control signal FBct. .

  Further, the control unit 22 generates a serif clarity control signal Cct for adjusting serif clarity based on the serif ratio information CXinf, the signal level information SigLev, and the volume level Volp to generate a serif clarity adjustment unit 24. Output to.

  The serif clarity adjusting unit 24 adjusts the serif clarity by adjusting the audio signal SC in accordance with the serif clarity control signal Cct. As the serif clarity adjustment process, for example, a process of adjusting the frequency band level corresponding to the formant frequency or equalizing can be applied.

  Further, the control unit 22 generates a low volume feeling control signal LWSct for adjusting the volume feeling of bass based on the spread degree information Winf, the signal level information SigLev, and the volume level Volp, and outputs the low volume feeling control signal LWSct to the low volume feeling adjustment unit 25. .

  The low volume feeling adjustment unit 25 adjusts the volume feeling of the low sound by adjusting the audio signal S according to the low volume feeling control signal LWSct. As the low volume feeling adjustment process, for example, a process of adjusting the frequency band level corresponding to the low sound range or equalizing can be applied.

  The audio signal S adjusted by the spaciousness adjusting unit 23, the serif clarity adjusting unit 24, and the low volume feeling adjusting unit 25 is output as audio signals DFL to DLFE. Thereafter, the audio signals DFL to DLFE are input to the D / A converters 4FL to 4LFE, respectively, as shown in FIG.

  Next, a method for obtaining various types of speech analysis information in the speech analysis unit 21 will be specifically described with reference to FIGS.

  FIG. 4 is a block diagram showing a configuration of the voice analysis unit 21. The voice analysis unit 21 includes a spread degree analysis unit 31, a front / rear balance analysis unit 32, a speech rate analysis unit 33, and a signal level analysis unit 34. As shown in FIG. 4, spread degree information Winf is generated by the spread degree analysis unit 31, front / rear balance information FBinf is generated by the front / rear balance analysis unit 32, and serif ratio information CXinf is generated by the serif ratio analysis unit 33. The level analyzer 34 generates signal level information SigLev.

  The spread degree analysis unit 31 will be described with reference to FIG. FIG. 5 is a block diagram illustrating a configuration of the spread degree analysis unit 31. The spread degree analyzing unit 31 obtains spread degree information Winf based on the difference between the signal obtained by adding the left audio signals SFL, SSL, and SSBL and the signal obtained by adding the right audio signals SFR, SSR, and SSBR.

  More specifically, first, the spread degree analysis unit 31 weights and adds (downmix) each of the left audio signals SFL, SSL, and SSBL. In the example shown in FIG. 5, the audio signal SFL is weighted by -8 dB, and the audio signals SSL, SSBL are weighted by -11 dB and added. That is, the front audio signal SFL is weighted with a larger value than the rear audio signals SSL and SSBL. In addition, the spread degree analysis unit 31 similarly weights and adds each of the right audio signals SFR, SSR, and SSBR. Also in this case, like the left audio signal, the front audio signal SFR is weighted with a larger value than the rear audio signals SSR and SSBR and then added.

  As shown in FIG. 5, the spread degree analysis unit 31 obtains a difference signal between a signal obtained by adding the left audio signals SFL, SSL, and SSBL and a signal obtained by adding the right audio signals SFR, SSR, and SSBR. Then, the spread degree analysis unit 31 inputs the obtained difference signal to the absolute value circuit (ABS) 311 to convert it to an absolute value, smoothes the absolute value of the difference signal by the low-pass filter 312, and spread degree information It outputs to the control part 22 as a signal which shows Winf.

  As described above, the spread degree information is obtained based on the difference between the signal obtained by adding the left audio signals SFL, SSL, and SSBL and the signal obtained by adding the right audio signals SFR, SSR, and SSBR. The spread degree information indicates the degree of spread of the sound to the left and right. Specifically, the greater the spread degree information, the greater the right and left voice spread degree, and the smaller the spread degree information, the smaller the right and left voice spread degree.

  The front-rear balance analysis unit 32 will be described with reference to FIG. FIG. 6 is a block diagram showing a configuration of the front-rear balance analysis unit 32. The front-rear balance analysis unit 32 is based on a difference between a signal obtained by absoluteizing and averaging the front audio signals SFL, SC, and SFR and a signal obtained by averaging the rear audio signals SSL, SSR, SSBL, and SSBR. Thus, the front-rear balance information FBinf is obtained.

  More specifically, first, the front-rear balance analyzing unit 32 inputs the front audio signals SFL, SC, SFR to the absolute value circuit 321 and converts them into absolute values, and averages them. For example, in the example shown in FIG. 6, the front audio signal has three channels. Therefore, the front-rear balance analysis unit 32 converts the front audio signals SFL, SC, SFR into absolute values, and then multiplies each coefficient by 1/3. Then add. Further, the front-rear balance analyzing unit 32 inputs the rear audio signals SSL, SSR, SSBL, and SSBR to the absolute value circuit 321 and converts them into absolute values, and averages them. For example, in the example shown in FIG. 6, there are four channels of the rear audio signal. Therefore, the front-rear balance analysis unit 32 converts the rear audio signals SSL, SSR, SSBL, SSBR into absolute values and then uses a coefficient of 1/4. Multiply and then add.

  The front-rear balance analysis unit 32 smoothes the averaged front audio signal with the low-pass filter 322 and smoothes the averaged rear audio signal with the low-pass filter 323. Then, the front / rear balance analysis unit 32 outputs the smoothed difference signal between the front and rear audio signals to the control unit 22 as a signal indicating the front / rear balance information FBinf.

  Thus, based on the difference between the absolute value of the front audio signals SFL, SC, SFR and the averaged signal and the absolute value of the rear audio signals SSL, SSR, SSBL, SSBR and the averaged signal The front / rear balance information FBinf is obtained. The front-rear balance information indicates the balance between the front and rear audio. Specifically, when the front-rear balance information FBinf is positive, it indicates that the level of the front audio signal is higher than the level of the rear audio signal, and the front-rear balance information FBinf is negative. Indicates that the level of the rear audio signal is higher than the level of the front audio signal.

  The serif ratio analysis unit 33 will be described with reference to FIG. FIG. 7 is a block diagram showing a configuration of the serif ratio analysis unit 33. The serif ratio analysis unit 33 obtains serif ratio information CXinf based on the level of each of the plurality of frequency bands in the central audio signal SC.

  More specifically, the serif ratio analysis unit 33 includes a filter bank 331 in which a plurality of band pass filters BPF_1 to BPF_N (N: integer) having different center frequencies are arranged in parallel. The serif ratio analysis unit 33 inputs the central audio signal SC to the filter bank 331, that is, inputs the central audio signal SC to the plurality of bandpass filters BPF_1 to BPF_N, thereby setting the level for each of the plurality of frequency bands. Ask. FIG. 8 shows an example of the frequency characteristics of the filter bank 331. As shown in FIG. 8, by inputting the central audio signal SC to the filter bank 331, the level for each of a plurality of frequency bands in the central audio signal SC can be detected.

  The serif ratio determination processing unit 332 obtains the ratio of the serif and other background sounds based on the level in the frequency band of the voice of a human or the like and the level in the other frequency band, and determines the obtained ratio to the serif. It outputs to the control part 22 as ratio information CXinf. Thus, the speech ratio information CXinf is obtained based on the level for each of the plurality of frequency bands in the central audio signal SC. In addition, as a method for obtaining the line ratio information CXinf, instead of using a filter bank, FFT (Fast Fourier Transform) or generalized harmonic analysis may be used.

  The signal level analysis unit 34 will be described with reference to FIG. FIG. 9 is a block diagram illustrating a configuration of the signal level analysis unit 34. The signal level analysis unit 34 converts the audio signals SFL, SC, SFR, SSR, SSL, SSBL, and SSBR into absolute values by the absolute value circuit 341. Then, the signal level analysis unit 34 inputs these sound signals to the maximum value circuit 342, and obtains the signal of the maximum level among these sound signals. The signal level analysis unit 34 smoothes the signal of the maximum level with the low-pass filter 343 and outputs the signal to the control unit 22 as signal level information SigLev indicating the signal level of the audio signal S.

  Next, operations in the control unit 22 and the adjustment units 23 to 25 will be described.

  As described in the explanation of FIG. 3, the control unit 22 generates various control signals based on the various analysis information from the voice analysis unit 21 and the volume level Volp from the microcomputer 7, and adjusts the control unit 23. To 25. Each of the adjusting units 23 to 25 adjusts a sense of breadth, a balance before and after a sense of breadth, a serif clarity and a volume of bass according to various control signals.

  First, a method for adjusting the feeling of spread will be described. Based on the spread degree information Winf, the signal level information SigLev, and the volume level Volp, the control unit 22 generates a spread feeling control signal Wct including an adjustment amount of the spread feeling and outputs the spread feeling control signal Wct to the spread feeling adjustment unit 23. The spread feeling adjustment unit 23 adjusts the spread feeling by adjusting the audio signals SFL, SFR, SSL, SSR, SSBL, and SSBR in accordance with the adjustment amount of the spread feeling.

  More specifically, the control unit 22 sets the adjustment amount for the feeling of spread based on the spread degree information Winf. Specifically, based on the spread degree information Winf, the control unit 22 sets the adjustment amount of the spread feeling as the left and right spread degree is larger, and sets the adjustment amount of the spread feeling as the left and right spread degree is smaller. Set smaller. Here, in order to avoid an excessive acoustic effect, when the left / right spread degree is larger than a predetermined value, the greater the left / right spread degree, the smaller the adjustment amount of the spread feeling may be set.

  Here, the control unit 22 further changes the adjustment amount of the feeling of spread not only according to the spread degree information Winf but also according to the signal level information SigLev and the volume level Volp. Specifically, the control unit 22 obtains a reproduction volume that is the volume of the reproduced audio by integrating the signal level of the audio signal S and the volume level Volp, and based on the reproduction volume, the reproduction volume and Using the map showing the relationship with the adjustment amount, the adjustment amount of the spread feeling is changed.

  FIG. 10 is a graph showing the relationship between the playback volume and the adjustment amount. Here, the “adjustment amount” in FIG. 10 indicates not only the adjustment amount for the sense of spread, but also other adjustment amounts described later (the adjustment amount for the front and rear balance adjustment, the adjustment amount for the serif clarity), and the like.

  In the graph L indicated by the solid line in FIG. 10, when the reproduction volume is larger than Pa, the control unit 22 sets the adjustment amount to the minimum value ADmin, that is, performs no adjustment at all. When the reproduction volume is larger than Pb and equal to or less than Pa, the control unit 22 performs setting to increase the adjustment amount as the reproduction volume decreases. When the playback volume is equal to or less than Pb, the control unit 22 sets the adjustment amount to the maximum value ADmax. Thus, the graph L has a property that the adjustment amount increases as the reproduction volume decreases, and the adjustment amount decreases as the reproduction volume increases. This is because the lower the playback volume, the farther away from the sound intended by the sound creator, the greater the degree of adjustment. In other words, the higher the playback volume, the closer to the sound intended by the sound creator without adjustment. The control unit 22 changes the adjustment amount of the feeling of spread using the map showing the relationship of the graph of FIG.

  Note that the map showing the relationship between the reproduction volume and the adjustment amount is not limited to the one showing the relationship of the graph L. In short, the map showing the relationship between the reproduction volume and the adjustment amount may be any map having the property that the adjustment amount increases as the reproduction volume decreases.

  For example, in the graph L, the adjustment amount is set to the maximum value ADmax when the reproduction volume is Pb or less. However, the adjustment amount is not limited to this, and the adjustment amount is set when the reproduction volume is the minimum value Pmin. The maximum value ADmax may be used. Further, in the graph L, the adjustment amount is set to the minimum value ADmin when the reproduction volume becomes larger than Pa. However, the adjustment amount is not limited to this, and the adjustment amount is changed when the reproduction volume becomes the maximum value Pmax. The minimum value ADmin may be used. That is, the adjustment amount may be obtained using a map showing the relationship of the graphs as indicated by broken lines La1 to La3 in FIG. Further, the adjustment amount may be obtained using a map showing a relationship of a graph obtained by connecting a plurality of straight lines having different inclinations, such as the graphs Na and Nb indicated by the one-dot chain line in FIG. For example, the slope of the graph Na changes with (reproduction volume, adjustment amount) = (Pc, ADc). In the graph Nb, the inclination changes with (reproduction volume, adjustment amount) = (Pd, ADd), (Pe, ADe), respectively. Furthermore, the relationship between the playback volume and the adjustment amount is not limited to that shown by a straight line graph such as the graph L, La1 to La3, Na, or Nb. For example, the relationship between the playback volume and the adjustment amount may be a curved graph such as the graph Ma or Mb. It may be shown.

  The control unit 22 can change the adjustment amount by using the map showing the relationship of the graph of FIG. 10, and can convey the sound to the user in an impressive manner regardless of the volume that the actual user listens to.

  The control unit 22 outputs a spread feeling control signal Wct including the spread feeling adjustment amount set by the above-described method to the spread feeling adjustment unit 23 (see FIG. 3). The spread feeling adjustment unit 23 performs, for example, wide stereo processing or reflected sound / reverberation sound addition processing on the audio signals SFL, SFR, SSL, SSR, SSBL, SSBR according to the adjustment amount of the spread feeling, Adjust the left / right spread. Specifically, the spread feeling adjustment unit 23 adjusts the spread feeling to increase as the adjustment amount of the spread feeling increases, and adjusts the spread feeling to decrease as the adjustment amount of the spread feeling decreases. For example, when the processing for adding reverberation sound is performed, the spread feeling adjustment unit 23 increases the degree of addition of reverberation sound as the adjustment amount of the spread feeling increases, and decreases as the adjustment amount of the spread feeling decreases. Reduce the degree of sound addition. By doing in this way, a feeling of expanse can be adjusted appropriately and it becomes possible to convey sound to a user impressively.

  Next, a method for adjusting the front / rear balance of the feeling of spreading will be described. Based on the front / rear balance information FBinf, the signal level information SigLev, and the volume level Volp, the control unit 22 generates a front / rear balance control signal FBct including a front / rear balance adjustment amount for adjusting the balance of the forward and rearward spread feeling. And output to the spread feeling adjustment unit 23. The spread feeling adjusting unit 23 adjusts the balance between the forward and rear spread feelings by adjusting the audio signals SFL, SFR, SSL, SSR, SSBL, and SSBR in accordance with the front-rear balance adjustment amount.

  More specifically, the control unit 22 determines which one of the front and rear audio signals has a higher level based on the front / rear balance information FBinf. Specifically, when the front / rear balance information FBinf is positive, the control unit 22 determines that the level of the front audio signal is higher, and when the front / rear balance information FBinf is negative, It is determined that the level of the audio signal is higher. Then, the control unit 22 sets the front / rear balance adjustment amount so that the adjustment amount of the spread feeling of the larger sound signal level is larger than the adjustment amount of the spread feeling of the smaller sound signal level. To do. Further, the control unit 22 sets the magnitude of the front / rear balance adjustment amount according to the absolute value of the front / rear balance information FBinf. As the size of the front / rear balance adjustment amount increases, the difference between before and after the adjustment amount of the spread feeling increases.

  Here, the control unit 22 further changes the front / rear balance adjustment amount not only according to the front / rear balance information FBinf but also according to the signal level information SigLev and the volume level Volp. Specifically, the control unit 22 changes the front-rear balance adjustment amount using the relationship of the graph of FIG. 10 described above according to the reproduction volume obtained by integrating the signal level of the audio signal S and the volume level Volp. Let

  The control unit 22 outputs the front / rear balance control signal FBct including the front / rear balance adjustment amount set by the above-described method to the spread feeling adjustment unit 23. The spread feeling adjusting unit 23 adjusts the balance between the forward and rear spread feelings by adjusting the audio signals SFL, SFR, SSL, SSR, SSBL, and SSBR in accordance with the front-rear balance adjustment amount. Specifically, the spread feeling adjustment unit 23 makes the front spread feeling adjustment amount larger than the rear spread feeling adjustment amount according to the front / rear balance adjustment amount, or the rear spread feeling adjustment amount. Is larger than the adjustment amount of the forward spread feeling. For example, when the processing for adding the reverberation sound is performed, the spread feeling adjustment unit 23 has a rear audio signal SSL, SSR, SSBL, SSBR when the adjustment amount of the forward spread feeling is larger than the rear adjustment amount. Processing for increasing the degree of addition of reverberant sound to the front audio signals SFL and SFR is performed. Further, when the rear adjustment amount is larger than the front adjustment amount, the spread feeling adjustment unit 23 adds reverberation sound to the rear audio signals SSL, SSR, SSBL, and SSBR rather than the front audio signals SFL and SFR. The process of increasing the degree is performed.

  Here, it is assumed that the spread feeling adjusting unit 23 does not adjust the central audio signal SC. This is because the central audio signal SC is mainly an audio signal including speech, so that when the adjustment of the spread feeling is performed, the sound including the speech also has a spread feeling. It becomes difficult to hear.

  By doing so, it is possible to appropriately adjust the balance between the forward and rearward spread feeling, and it is possible to convey the sound deeply to the user.

  Next, a method for adjusting the serif clarity will be described. The control unit 22 generates a serif clarity control signal Cct including the serif clarity adjustment amount based on the serif ratio information CXinf, the signal level information SigLev, and the volume level Volp, and outputs the generated serif clarity control signal Cct to the serif clarity adjustment unit 24. . The serif clarity adjuster 24 adjusts the serif clarity by adjusting the central audio signal SC according to the serif clarity adjustment amount.

  More specifically, the control unit 22 obtains the ratio between the speech and the other speech based on the speech ratio information CXinf, and adjusts the adjustment amount of the speech clarity according to the balance between the speech and the other speech. Set. For example, when the proportion of speech is larger than the proportion of other speech, the control unit 22 increases the adjustment amount of speech clarity according to the proportion of speech. Instead of doing this, the control unit 22 may determine the presence or absence of speech from the relationship between the proportion of speech and the proportion of other speech. For example, the control unit 22 determines that there is a line when it is determined that the ratio of the line is equal to or greater than a predetermined value. When it is determined that there is a line, the control unit 22 sets a predetermined adjustment amount of the line clarity, and when it is determined that there is no line, the control unit 22 performs an adjustment with the adjustment level of the line clearness as a minimum value. Suppose that there is no.

  Here, the control unit 22 further changes the adjustment amount of the serif clarity according to not only the serif ratio information CXinf but also the signal level information SigLev and the volume level Volp. Specifically, the control unit 22 uses the relationship of the graph in FIG. 10 described above according to the reproduction volume obtained by integrating the signal level of the audio signal S and the volume level Volp, thereby adjusting the amount of adjustment of the serif clarity. To change.

  The control unit 22 outputs a serif clarity control signal Cct including the serif clarity adjustment amount set by the above method to the serif clarity adjustment unit 24. The serif clarity adjustment unit 24 adjusts the level of the frequency band corresponding to the formant frequency, for example, by performing the process of equalizing the central audio signal SC according to the adjustment amount of the serif clarity, Adjust serif clarity.

  Specifically, the serif clarity adjustment unit 24 performs an adjustment to increase the serif clarity as the adjustment amount of the serif clarity increases, and an adjustment to decrease the serif clarity as the adjustment amount of the serif clarity decreases. I do. For example, when processing for adjusting the level of the frequency band corresponding to the formant frequency is performed, the serif clarity adjustment unit 24 adjusts the level of the frequency band corresponding to the formant frequency as the adjustment amount of the serif clarity increases. The amount of adjustment of the level of the frequency band corresponding to the formant frequency is reduced as the amount is increased and the adjustment amount of the serif clarity is reduced. By doing so, it is possible to appropriately clarify the lines, and it is possible to convey the sound impressively to the user.

  Next, a method for adjusting the volume of bass is described. Based on the spread degree information Winf, the signal level information SigLev, and the volume level Volp, the control unit 22 generates a low volume feeling control signal LWSct including an adjustment amount of the low volume feeling and outputs the low volume feeling control signal LWSct to the low volume feeling adjustment unit 25. The low volume feeling adjustment unit 25 adjusts the volume feeling of the bass by adjusting the audio signal according to the adjustment amount of the volume feeling of the bass.

  More specifically, based on the spread degree information Winf, the control unit 22 sets the bass volume adjustment amount to be smaller as the spread degree is smaller, and sets the bass volume adjustment amount to be larger as the spread degree is larger. To do. This is because when the degree of spread is small, there is a high possibility that words are being emitted, and if the amount of adjustment of the volume of bass is increased, it becomes difficult to hear the lines. On the other hand, when the degree of spread is large, there is a high possibility of a powerful scene, and it is necessary to increase the force by increasing the adjustment amount of the bass volume.

  Here, the control unit 22 further changes the adjustment amount of the bass volume feeling not only according to the spread degree information Winf but also according to the signal level information SigLev and the volume level Volp. Specifically, the control unit 22 uses the relationship of the graph of FIG. 10 described above in accordance with the reproduction volume obtained by integrating the signal level of the audio signal S and the volume level Volp, thereby adjusting the amount of bass volume feeling. To change.

  The control unit 22 outputs the low volume feeling control signal LWSct including the adjustment amount of the low volume feeling set by the above method to the low volume feeling adjustment unit 25. The low volume sensation adjusting unit 25 adjusts the level of the frequency band corresponding to the low sound range or equalizes the sound signal S according to the adjustment amount of the low sound volume, for example. Make adjustments. Specifically, the low volume sensation adjustment unit 25 performs an adjustment to increase the volume of the bass as the adjustment amount of the volume of the bass increases, and performs an adjustment to reduce the volume of the bass as the adjustment amount of the volume of the bass decreases. Do. For example, when processing for adjusting the level of the frequency band corresponding to the bass range is performed, the serif clarity adjusting unit 24 adjusts the level of the frequency band corresponding to the bass range as the bass volume adjustment amount increases. The amount of adjustment of the level of the frequency band corresponding to the low sound range is reduced as the amount is increased and the adjustment amount of the bass volume is reduced. By doing so, it is possible to appropriately adjust the volume of the bass, and it is possible to convey the sound impressively to the user. Here, the control unit 22 may similarly adjust the high sound range in order to balance the low sound range.

  As described above, according to the first embodiment, based on the analysis information analyzed by the voice analysis unit 21 and the volume level, the voice signal S is expressed with respect to a sense of breadth, clarity of lines, and volume of bass. Adjusted. By doing in this way, the sound expressed by the sound creator can be transmitted to the user in an impressive manner, and a sense of reality can be obtained. In particular, by changing the adjustment amount based on the signal level and the volume level of the audio signal S, the sound can be transmitted to the user in an impressive manner regardless of the volume that the actual user listens to.

[Second Embodiment]
Next, a sound adjustment apparatus according to the second embodiment will be described. Depending on whether the user's listening environment is bright or dark, the way the sound is heard and the sense of localization when the playback volume is relatively low may differ. Therefore, in the sound adjustment device according to the second embodiment, the sound signal is adjusted according to the listening environment of the user.

  FIG. 11 is a block diagram illustrating a configuration of an audio system including the audio adjusting device according to the second embodiment.

  The audio system 100a shown in FIG. 11 is different from the audio system 100 shown in FIG. 1 in that it includes a signal processing circuit 2a instead of the signal processing circuit 2 and an illuminance sensor 9 connected to the microcomputer 7. .

  The illuminance sensor 9 is installed outside an AV amplifier or the like including the signal processing circuit 2a, and detects ambient brightness (illuminance), for example, brightness of the listening room 10 (see FIG. 2) where the user is present. The microcomputer 7 transmits illuminance information LXinf indicating the illuminance detected by the illuminance sensor 9 to the signal processing circuit 2a.

The configuration of the signal processing circuit 2a will be described with reference to FIG. FIG. 12 is a block diagram showing a configuration of the signal processing circuit 2a. In FIG. 12, audio signals are indicated by solid lines, and signals such as control signals other than audio signals are indicated by broken lines.
The signal processing circuit 2a illustrated in FIG. 12 includes an adjustment unit 26 based on illuminance in addition to the configuration of the signal processing circuit 2 illustrated in FIG.

  Based on the illuminance information LXinf, the signal level information SigLev, and the volume level Volp, the control unit 22 generates an adjustment control signal LXct including an adjustment amount (adjustment amount based on illuminance) for adjusting the signal level according to the illuminance. And output to the adjustment unit 26 by illuminance. The adjustment unit 26 based on the illuminance adjusts the audio signal S according to the adjustment amount based on the illuminance. As this adjustment process, for example, a process of amplifying the level of the entire band of the audio signal S or amplifying only the level of a relatively high frequency band near 8 kHz can be applied according to the adjustment amount by the illuminance.

  More specifically, based on the illuminance information LXinf, the control unit 22 sets the adjustment amount based on the illuminance as the illuminance is high, and sets the adjustment amount based on the illuminance as the illuminance is low. This is because a dark place is more sensitive to a small sound than a bright place, that is, it has a human auditory characteristic that a small sound is easy to hear.

  Here, the control unit 22 further changes the adjustment amount according to the illuminance not only according to the illuminance information LXinf but also according to the signal level information SigLev and the volume level Volp. Specifically, the control unit 22 changes the adjustment amount according to the illuminance using the relationship of the graph of FIG. 10 described above according to the reproduction volume obtained by integrating the signal level of the audio signal S and the volume level Volp. Let

  The control unit 22 outputs an adjustment control signal LXct including the adjustment amount based on the illuminance set by the above method to the adjustment unit 26 based on the illuminance. The adjustment unit 26 based on illuminance increases the amplification degree of the audio signal S as the adjustment amount due to illuminance increases, and decreases the amplification degree of the audio signal S as the adjustment amount due to illuminance decreases.

  As described above, according to the second embodiment, the audio signal S is adjusted based on the ambient illuminance detected by the illuminance sensor, the signal level of the audio signal, and the volume level. By doing so, the sound can be transmitted to the user in an impressive manner regardless of the brightness of the place where the user listens.

[Third embodiment]
Next, a sound adjustment apparatus according to the third embodiment will be described. In the first and second embodiments, the example in which the audio signal input from the sound source is multi-channel has been described. In the third embodiment, the audio signal input from the sound source is 2-channel. An example will be described.

  FIG. 13 is a block diagram showing a configuration of the signal processing circuit 2b. In FIG. 13, audio signals are indicated by solid lines, and signals such as control signals other than audio signals are indicated by broken lines.

  The audio system provided with the audio adjustment device according to the third embodiment is different from the audio system 100 shown in FIG. 1 in that it includes a signal processing circuit 2b instead of the signal processing circuit 2, and as shown in FIG. The sound signals SFL, SFR, and SLFE are input from the sound source 1 as the sound signal S. The signal processing circuit 2b includes a voice analysis unit 21b instead of the voice analysis unit 21 as a difference from the signal processing circuit 2 shown in FIG. Further, in the third embodiment, since there is no central audio signal, the speech is transmitted by the left and right audio signals SFL and SFR.

  FIG. 14 is a block diagram showing a configuration of the voice analysis unit 21b. The voice analysis unit 21b includes a spread degree analysis unit 31b, a serif ratio analysis unit 33b, and a signal level analysis unit 34b. As shown in FIG. 14, the spread degree analysis unit 31b generates spread degree information Winf, the serif ratio analysis unit 33b generates serif ratio information CXinf, and the signal level analysis unit 34b generates signal level information SigLev.

  The spread degree analyzing unit 31b will be described with reference to FIG. FIG. 15 is a block diagram illustrating a configuration of the spread degree analysis unit 31b. As in the first embodiment, the spread degree analysis unit 31b obtains spread degree information Winf based on the difference between the left audio signal SFL and the right audio signal SFR. Here, as shown in FIG. 15, both the audio signal SFL and the audio signal SFR are weighted equally. For example, in the example shown in FIG. 15, both the audio signal SFL and the audio signal SFR are weighted with 0 dB. The spread degree analyzing unit 31b converts the difference signal between the left audio signal SFL and the right audio signal SFR into an absolute value by the absolute value circuit 31b1. Then, the spread degree analyzing unit 31b smoothes the difference signal that has been converted to an absolute value by the low-pass filter 31b2, and outputs the spread degree information Winf to the control unit 22 as well as the spread degree information Winf to the serif ratio analyzing unit 33b. Also output.

  Returning to FIG. 14, the serif ratio analysis unit 33b will be described. In the third embodiment, unlike the first embodiment, the serif ratio analysis unit 33b generates serif ratio information CXinf based on the spread degree information Winf. Specifically, based on the spread degree information Winf, the serif ratio analysis unit 33b determines that the serif ratio increases as the spread degree decreases, and the serif ratio decreases as the spread degree increases. Find the percentage of other audio. Then, the speech rate analysis unit 33b outputs the result obtained in this way to the control unit 22 as the speech rate information CXinf. In this way, even if there is no central audio signal and the lines are transmitted by the left and right audio signals SFL, SFR, the line ratio information CXinf is obtained.

  Similarly to the signal level analysis unit 34 of the first embodiment (see FIG. 9), the signal level analysis unit 34b converts each of the audio signals SFL and SFR into absolute values using an absolute value circuit. Then, the signal level analyzing unit 34b smoothes the signal of the maximum level among these audio signals converted into absolute values by a low-pass filter, and controls the control unit 22 as signal level information SigLev indicating the signal level of the audio signal S. Output to.

  As in the first embodiment, the control unit 22 generates various control signals for adjusting the audio signal based on the various analysis information and the volume level Volp. The sound is output to the clarity adjusting unit 24 and the low volume feeling adjusting unit 25.

  First, a method for adjusting the feeling of spread will be described. Based on the spread degree information Winf, the signal level information SigLev, and the volume level Volp, the control unit 22 generates a spread feeling control signal Wct for adjusting the spread feeling of the sound, and outputs the spread feeling control signal Wct.

  Specifically, as in the first embodiment, the control unit 22 sets the adjustment amount of the feeling of spread according to the spread degree information Winf, and integrates the signal level of the audio signal S and the volume level Volp. In accordance with the reproduction volume, the adjustment amount of the feeling of spread is changed using the relationship of the graph of FIG. 10 described above.

  The control unit 22 outputs a spread feeling control signal including the adjustment amount of the spread feeling set by the above-described method to the spread feeling adjustment unit 23. The spread feeling adjustment unit 23 adjusts the spread feeling by performing, for example, wide stereo processing or reflected sound / reverberation sound addition processing on the audio signals SFL and SFR according to the adjustment amount of the spread feeling.

  Next, a method for adjusting the serif clarity will be described. The control unit 22 generates a serif clarity control signal Cct for adjusting serif clarity based on the serif ratio information CXinf, the signal level information SigLev, and the volume level Volp, and outputs the serif clarity control signal Cct to the serif clarity adjustment unit 24. To do.

  Specifically, as in the first embodiment, the control unit 22 sets the serif clarity adjustment amount according to the serif ratio information CXinf, and integrates the signal level of the audio signal S and the volume level Volp. In accordance with the reproduced sound volume, the adjustment amount of the serif clarity is changed using the relationship of the graph of FIG. 10 described above.

  The control unit 22 outputs a serif clarity control signal Cct including the serif clarity adjustment amount set by the above method to the serif clarity adjustment unit 24. The serif clarity adjustment unit 24 adjusts the level of the frequency band corresponding to, for example, the formant frequency or equalizes the audio signals SFL and SFR according to the serif clarity adjustment amount, thereby Adjust clarity.

  Next, a method for adjusting the volume of bass is described. The control unit 22 generates a low volume feeling control signal LWSct based on the spread degree information Winf, the signal level information SigLev, and the volume level Volp.

  Specifically, as in the first embodiment, the control unit 22 sets the adjustment amount of the bass volume according to the spread degree based on the spread degree information Winf, and sets the signal level of the audio signal S. In accordance with the reproduction volume obtained by integrating the volume level Volp, the bass volume adjustment amount is changed using the relationship of the graph of FIG. 10 described above.

  The control unit 22 outputs the low volume feeling control signal LWSct including the adjustment amount of the low volume feeling set by the above method to the low volume feeling adjustment unit 25. The low volume sensation adjusting unit 25 adjusts the level of the frequency band corresponding to the low frequency range or equalizes the audio signals SFL, SFR, and SLFE according to the adjustment amount of the low volume. Adjust the sense of volume.

  As described above, according to the third embodiment, similarly to the first embodiment, by changing the adjustment amount based on the signal level of the audio signal S and the volume level Volp, the volume that the actual user listens to Regardless of this, the sound can be transmitted to the user in an impressive manner. Further, according to the third embodiment, the speech rate information indicating the rate of speech is obtained based on the spread degree information, and the control signal is obtained based on the signal level, volume level, and speech rate information of the audio signal S. Generated. By doing in this way, even when there is no central audio signal and the lines are transmitted by the left and right audio signals SFL, SFR, that is, for example, when the audio signal has two channels, The adjusting means can appropriately clarify the lines, and can convey the sound to the user impressively.

(Application example of the third embodiment)
A sound adjustment apparatus according to an application example of the third embodiment will be described.

  FIG. 16 is a block diagram showing a configuration of a signal processing circuit 2b according to an application example of the third embodiment. In FIG. 16, the audio signal is indicated by a solid line, and signals such as control signals other than the audio signal are indicated by a broken line.

  Similar to the second embodiment described above, in the application example of the third embodiment, as can be seen from FIG. 16, the audio system includes an illuminance sensor 9 connected to the microcomputer 7, and the signal processing circuit 2b is adjusted by illuminance. A portion 26 is provided. Similar to the second embodiment described above, the microcomputer 7 transmits illuminance information LXinf indicating the illuminance detected by the illuminance sensor 9 to the signal processing circuit 2b.

  Based on the illuminance information LXinf, the signal level information SigLev, and the volume level Volp, the control unit 22 generates an adjustment control signal LXct including an adjustment amount based on illuminance, and outputs the adjustment control signal LXct to the adjustment unit 26 based on illuminance.

  Specifically, as in the second embodiment, the control unit 22 sets an adjustment amount based on the illuminance in accordance with the illuminance information LXinf, and adjusts the reproduction level by integrating the signal level of the audio signal S and the volume level Volp. Accordingly, the adjustment amount by the illuminance is changed using the relationship of the graph of FIG. 10 described above.

  The control unit 22 outputs an adjustment control signal LXct based on illuminance including an adjustment amount based on illuminance set by the above-described method to the adjustment unit 26 based on illuminance. The illuminance adjustment unit 26 adjusts the audio signal S in accordance with the illuminance adjustment control signal LXct. As this adjustment process, for example, a process of amplifying the level of the entire band of the audio signal S or amplifying only the level of a relatively high frequency band near 8 kHz can be applied according to the adjustment amount by the illuminance.

  By doing so, the sound can be transmitted to the user in an impressive manner, regardless of the brightness of the place where the user listens, as in the second embodiment.

[Modification]
In the first embodiment described above, the speech ratio analysis unit 33 obtains the speech ratio information CXinf based on the central audio signal SC. However, the present invention is not limited to this, and as described in the third embodiment. Alternatively, the speech ratio information CXinf may be obtained based on the spread degree information Winf.

  Further, in each of the above-described embodiments, adjustment is made for any of the sense of breadth, the clarity of speech, and the volume of bass. However, the present invention is not limited to this. Needless to say, the present invention is applicable even if at least one of them is adjusted.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. Moreover, it is included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for an audio system such as an AV amplifier or a television that supplies an audio signal to a multi-channel speaker and makes it ring.

Claims (7)

Voice analysis means for analyzing voice in real time based on the input voice signal;
Control means for generating a control signal for adjusting the sound signal based on analysis information of the sound analyzed by the sound analysis means and a volume level instructed by a user;
Adjustment means for adjusting and outputting the audio signal for a sense of breadth, clarity of lines, and volume of bass based on the control signal;
The sound control apparatus, wherein the control means changes an adjustment amount of the sound signal based on a signal level of the sound signal and the volume level.   2. The audio according to claim 1, wherein the control unit increases the adjustment amount of the audio signal as the reproduction volume obtained by integrating the signal level of the audio signal and the volume level decreases. Adjustment device. Equipped with detecting means for detecting ambient illuminance,
The control means generates the control signal based on the illuminance detected by the detection means, the signal level of the audio signal, and the volume level,
The audio adjusting apparatus according to claim 1, wherein the adjusting unit adjusts and outputs the audio signal based on the control signal. The voice analysis means calculates spread degree information indicating a spread degree of the sound to the left and right based on a difference between the signal obtained by adding the left sound signal and the signal obtained by adding the right sound signal,
4. The control unit according to claim 1, wherein the control unit generates the control signal for adjusting the audio signal based on a signal level of the audio signal, the volume level, and the spread degree information. The audio adjustment device according to any one of the above. The voice analysis means includes front and rear balance information indicating a balance between front and rear voices based on a difference between a signal obtained by absoluteizing and averaging the front voice signal and a signal obtained by absoluteizing and averaging the rear voice signal. Calculate
The said control means produces | generates the said control signal for adjusting the said audio | voice signal based on the signal level of the said audio | voice signal, the said volume level, and the said front-back balance information. Audio adjustment device. The speech analysis means calculates speech rate information indicating the rate of speech in speech based on the level for each frequency band of the central audio signal,
The said control means produces | generates the said control signal for adjusting the said audio | voice signal based on the signal level of the said audio | voice signal, the said volume level, and the said speech ratio information. The audio adjustment device according to any one of the above. The voice analysis means calculates serif ratio information indicating the ratio of serif based on the spread degree information,
The said control means produces | generates the said control signal for adjusting the said audio | voice signal based on the signal level of the said audio | voice signal, the said volume level, and the said speech ratio information. Audio adjustment device.

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