JP2018072359A - Acoustic device and correction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic device capable of reducing unpleasantness given to a user in correction of a frequency characteristic using a test sound.SOLUTION: An acoustic device 100 comprises an acoustic unit 10 and a control unit 20. The control unit 20 comprises a sound collection section 21 for acquiring peripheral sound of the control unit 20, which includes voice of a user, and a transmission section 23 for transmitting a control signal for controlling the acoustic unit 10 to the acoustic unit on the basis of the voice of the user acquired by the sound collection section 21. The acoustic unit 10 comprises a sound output section 106 and a signal processing section 120 for allowing the sound output section 106 to output sounds of 12 scales constituting one octave as test sounds for allowing the sound collection section 21 to acquire for correcting a frequency characteristic of the sound output from the sound output section 106.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to an acoustic device capable of correcting frequency characteristics of output sound.

  Patent Document 1 discloses an automatic sound field correction apparatus. The automatic sound field correction apparatus includes a speaker, a microphone, and a control unit that operates a graphic equalizer based on an audio signal from an acoustic source and an output from the microphone. Thereby, sound field correction can be performed comfortably.

Japanese Patent No. 2562433

  In the correction of the sound field (frequency characteristics) as described above, white noise is generally output from a speaker as a test sound, and the white noise may give an unpleasant feeling to the user.

  The present disclosure provides an acoustic device that can reduce discomfort given to a user in correcting frequency characteristics using a test sound.

  An acoustic device according to the present disclosure includes an acoustic device and a control device, and the control device acquires a sound around the control device including a user's voice, and the sound acquisition unit acquires the sound collection unit. A control signal transmitting unit that transmits a control signal for controlling the acoustic device to the acoustic device based on a user's voice, and the acoustic device has a sound output unit and 12 scales constituting one octave. A signal processing unit that outputs the sound to the sound output unit as a test sound to be acquired by the sound collection unit in order to correct the frequency characteristics of the sound output from the sound output unit.

  The acoustic device according to the present disclosure can reduce discomfort given to the user in the correction of the frequency characteristics using the test sound.

FIG. 1 is a diagram for explaining a problem when the acoustic device (acoustic apparatus) according to Embodiment 1 is installed indoors. FIG. 2 is a diagram illustrating an outline of the operation of the acoustic device according to the first embodiment. FIG. 3 is a block diagram illustrating a functional configuration of the acoustic device according to the first embodiment. FIG. 4 is a flowchart of frequency characteristic correction processing. FIG. 5 is a diagram for explaining each chord of Cdim7, C # dim7, and Ddim7. FIG. 6 is a diagram conceptually illustrating correction of frequency characteristics. FIG. 7 is a diagram showing the frequency characteristics of the test sound over 5 octaves. FIG. 8 is a block diagram illustrating a functional configuration of the acoustic device according to the second embodiment.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  In addition, the inventors provide the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and these are intended to limit the subject matter described in the claims. is not.

(Embodiment 1)
[Background to obtaining the acoustic device of the present disclosure]
First, how the acoustic device of the present disclosure was obtained will be described. FIG. 1 is a diagram for explaining a problem when the acoustic device (acoustic apparatus) according to Embodiment 1 is installed indoors. FIG. 2 is a diagram illustrating an outline of the operation of the acoustic device according to the first embodiment.

  As illustrated in FIG. 1, when the acoustic device 10 (in the first embodiment, a television) is installed in the indoor space 200, the user 30 can output the sound output unit 106 (or the acoustic device 10) of the acoustic device 10. The direct sound 201 is received from the low-pitched sound output unit 106a) provided on the back surface. In addition to the direct sound 201, the user 30 also listens to the primary reflected sound 202 and the secondary reflected sound 203. In addition, part of the sound from the sound output unit 106 is transmitted through the indoor space 200 to the outside as the transmitted sound 204. In addition, part of the sound from the sound output unit 106 may be diffracted sound 205. That is, the characteristics (frequency characteristics) of the sound received by the user vary depending on the installation conditions of the acoustic device 10.

  Here, as a technique for improving the quality of the sound received by the user 30, a technique is known in which a dedicated microphone is installed at the listening position of the user 30 and the test sound output from the acoustic device 10 is monitored by the microphone. ing. In such a configuration, since the characteristics of the sound output from the acoustic device 10 are corrected based on the characteristics of the test sound monitored by the microphone installed at the listening position, the user 30 listens at the listening position. The sound characteristics can be brought close to desired characteristics.

  However, the above method has the following problems.

  In the above method, white noise or TSP (Time Stretched Pulse) sound (TSP signal) or the like is generally output as a test sound from a speaker. The user 30 may hear annoying noise to correct the sound characteristics, and may feel uncomfortable.

  In the above-described method, a dedicated microphone is necessary for correcting the sound characteristics. However, it is difficult to introduce such a dedicated microphone in devices for general households.

  Therefore, as shown in FIG. 2, the inventors, from the acoustic device 10, each of 12-scale sounds (C, C #, D,... B) constituting one octave as test sounds. I found a configuration to output. Thereby, the acoustic device 10 can correct the frequency characteristic while reducing the discomfort given to the user 30.

  In addition, for acquiring the test sound, a sound collection unit 21 used for voice recognition, which is included in the control device 20 (the remote controller in the first embodiment) that controls the acoustic device 10, is used. This makes it possible to correct the frequency characteristics without using a dedicated microphone.

  Hereinafter, a detailed configuration of the acoustic apparatus including the acoustic device 10 and the control device 20 will be described.

[Constitution]
First, the functional configuration of the acoustic device according to Embodiment 1 will be described. FIG. 3 is a block diagram illustrating a functional configuration of the acoustic device according to the first embodiment.

  As shown in FIG. 3, the audio device 100 (TV system) includes an audio device 10 and a control device 20. First, the configuration of the audio device 10 will be described.

  The acoustic device 10 is a device that outputs sound that the user 30 listens to. The acoustic device 10 is specifically a television, but may be other devices.

  The acoustic device 10 includes a signal generation unit 101, a signal acquisition unit 102, a switching unit 103, a filter unit 104, a speaker amplifier unit 105, a sound output unit 106, a control unit 107, a reception unit 108, a frequency The analysis unit 109, the selection unit 110, the storage unit 111, and the filter coefficient calculation unit 112 are included. The signal generation unit 101, the signal acquisition unit 102, the switching unit 103, the filter unit 104, the control unit 107, the reception unit 108, the frequency analysis unit 109, the selection unit 110, the storage unit 111, and the filter coefficient calculation unit 112 are The signal processing unit 120 is configured.

  The signal generation unit 101 generates a test signal (a signal for outputting a test sound) based on the control of the control unit 107. In the first embodiment, the test sound is a plurality of types of chords each consisting of a part of a 12-scale sound, more specifically, three chords Cdim7, C # dim7, and Ddim7. The signal generation unit 101 generates a test signal for outputting such a test sound. Specifically, the signal generation unit 101 is realized by a circuit (signal generation circuit).

  Specifically, the test sound is an electronic sound generated by combining (superimposing) sinusoidal waves, but an actual musical instrument sound or a MIDI sound source may be used as the test sound. Further, the signal generation unit 101 may generate a test sound that has been fade-in processed or faded-out. Note that fade-in processing or fade-out processing can be performed on the test signal generated by the signal generation unit 101 in the speaker amplifier unit 105 described later.

  The signal acquisition unit 102 acquires an acoustic signal (a signal for outputting television sound or the like).

  Based on the control of the control unit 107, the switching unit 103 selects whether to output the test signal generated by the signal generation unit 101 to the filter unit 104 or to output the acoustic signal obtained through the signal acquisition unit 102 to the filter unit 104. Switch. Specifically, the switching unit 103 is realized by a circuit (switching circuit).

  The filter unit 104 performs a filter process using the filter coefficient calculated by the filter coefficient calculation unit 112 on the acoustic signal output from the switching unit 103. In other words, the filter unit 104 corrects the frequency characteristics of the sound output from the sound output unit 106. Specifically, the filter unit 104 is realized by a circuit (filter circuit).

  The speaker amplifier unit 105 amplifies the test signal or the acoustic signal subjected to the filter process and outputs the amplified signal to the sound output unit 106. The speaker amplifier unit 105 is specifically realized by a circuit (speaker amplifier circuit).

  The sound output unit 106 outputs a test sound corresponding to the amplified test signal output from the speaker amplifier unit 105. Further, a sound corresponding to the amplified acoustic signal output from the speaker amplifier unit 105 is output. The sound output unit 106 is specifically a speaker.

  The reception unit 108 receives the test sound acquisition result (signal indicating the acquisition result) transmitted from the transmission unit 23 of the control device 20 and outputs the received acquisition result to the frequency analysis unit 109. In addition, the reception unit 108 receives a control signal for controlling the acoustic device 10 and outputs the received control signal to the control unit 107. The receiving unit 108 receives the acquisition result and the control signal by wireless communication. In this case, for example, wireless communication standards such as Bluetooth (registered trademark), Wi-Fi (registered trademark), and Zigbee (registered trademark) are used for wireless communication, but infrared communication or the like may be used. The receiving unit 108 is specifically realized by a wireless communication module (communication circuit).

  When the reception unit 108 receives the test sound acquisition result, the control unit 107 corrects the frequency characteristic of the sound output from the sound output unit 106 based on the acquisition result. Specifically, the control unit 107 controls the reception unit 108, the frequency analysis unit 109, the selection unit 110, the filter coefficient calculation unit 112, the signal generation unit 101, the switching unit 103, and the filter unit 104 to control the frequency characteristics. Make corrections.

  In addition, when the receiving unit 108 receives a control signal, the control unit 107 analyzes the control signal (sound signal) and performs various processes (such as channel change and volume change) according to the analysis result. Do. In this case, the existing speech recognition technology is used for the analysis. Note that the control unit 107 is specifically realized by a circuit (control circuit).

  Based on the control of the control unit 107, the frequency analysis unit 109 performs an FFT (Fast Fourier Transform) process on the test sound acquisition result received by the reception unit. As a result, the test sound acquisition result is expressed as a power value for each frequency. Specifically, the frequency analysis unit 109 is realized by a circuit (frequency analysis circuit).

  The selection unit 110 selects a main frequency included in the output test sound from the acquisition results after the FFT process, and stores the selected frequency and the power value of the frequency in the storage unit 111. For example, when Cdim7 composed of single sounds of C (261.6 Hz), D # (311.1 Hz), F # (370.0 Hz), and A (440.0 Hz) is output as a test sound The selection unit 110 selects these frequencies and the power value of the frequency and stores them in the storage unit 111. Specifically, the selection unit 110 is realized by a circuit (selection circuit).

  The storage unit 111 is a storage device that stores the frequency selected by the selection unit and the power value of the frequency. The storage unit 111 also stores ideal frequency characteristics (predetermined frequency characteristics) in design. The storage unit 111 is realized by, for example, a semiconductor memory.

  The filter coefficient calculation unit 112 reads the power value of the main frequency of the test sound stored in the storage unit 111 and the designed frequency characteristic stored in the storage unit 111. The filter coefficient calculation unit 112 compares the read acquisition result with the designed frequency characteristic, and calculates a filter coefficient for bringing the test sound acquisition result closer to the designed frequency characteristic. Specifically, the filter coefficient includes a gain, a Q value, a center value (Fc) of a frequency at which gain is increased or decreased, and the like. The calculation result (filter coefficient) is output to the filter unit 104. Specifically, the filter coefficient calculation unit 112 is realized by a circuit (filter coefficient calculation circuit).

  Next, the configuration of the control device 20 will be described. The control device 20 is a device that the user 30 operates to control the audio device 10. The control device 20 is specifically a TV remote controller, but may be other devices such as a smartphone or a tablet terminal. The control device 20 includes a sound collection unit 21, a microphone amplifier unit 22, and a transmission unit 23.

  The sound collection unit 21 acquires sounds around the control device 20 including the voice of the user 30 and outputs a sound signal (raw sound data) corresponding to the acquired sound. For example, the sound collection unit 21 acquires the test sound output from the sound output unit 106 and outputs an acquisition result (sound signal). Specifically, the sound collection unit 21 is a microphone.

  The microphone amplifier unit 22 amplifies the sound signal output from the sound collection unit 21 and outputs the amplified sound signal to the transmission unit 23. Specifically, the microphone amplifier unit 22 is realized by a circuit (microphone amplifier circuit).

  The transmission unit 23 is an example of a control signal transmission unit, and transmits a control signal for controlling the acoustic device 10 to the acoustic device 10 based on the voice of the user 30 acquired by the sound collection unit 21. More specifically, the transmission unit 23 receives the sound signal output from the sound collection unit 21 according to the voice of the user 30 and amplified by the microphone amplifier unit 22 as a control signal. To the unit 108.

  The transmission unit 23 also functions as an acquisition result transmission unit, and transmits a signal indicating the acquisition result of the test sound by the sound collection unit 21 to the acoustic device 10. More specifically, the transmission unit 23 uses the sound signal output from the sound collection unit 21 in response to the test sound and amplified by the microphone amplifier unit 22 as a signal indicating the acquisition result of the acoustic device 10. It transmits to the receiving part 108.

  The transmission unit 23 transmits the acquisition result and the control signal by wireless communication. In this case, for example, wireless communication standards such as Bluetooth (registered trademark), Wi-Fi (registered trademark), and Zigbee (registered trademark) are used for wireless communication, but infrared communication or the like may be used. In addition, the transmission unit 23 is specifically realized by a wireless communication module (communication circuit).

[Frequency characteristics correction processing]
Next, the correction process (correction method) of the frequency characteristics of the sound output from the sound output unit 106 executed by the acoustic device 100 will be described. FIG. 4 is a flowchart of frequency characteristic correction processing.

  First, the sound output unit 106 outputs a test sound (S11). Specifically, the control unit 107 causes the signal generation unit 101 to generate a test signal, and switches the switching unit 103 so that the filter unit 104 outputs the test signal. As a result, the test signal is output to the speaker amplifier unit 105 through the filter unit 104.

  The speaker amplifier unit 105 amplifies the test signal to a predetermined level and outputs it to the sound output unit 106. As a result, a test sound is output from the sound output unit 106.

  As described above, in the first embodiment, the test sound is three chords Cdim7, C # dim7, and Ddim7 (three kinds of reduced seven chords having C, C #, and D as root sounds, respectively). Yes, the sound output unit 106 outputs these three chords in an arbitrary order. Here, the three chords Cdim7, C # dim7, and Ddim7 are all chords composed of four single notes, and the four single notes have different pitches by one and a half tone. FIG. 5 is a diagram for explaining each chord of Cdim7, C # dim7, and Ddim7.

  As shown in FIG. 5A, Cdim7 is composed of four single sounds of C (261.6 Hz), D # (311.1 Hz), F # (370.0 Hz), and A (440.0 Hz). Consists of Further, as shown in FIG. 5B, C # dim7 is C # (277.2 Hz), E (329.6 Hz), G (392.0 Hz), and A # (466.2 Hz). It consists of four single notes. Further, as shown in FIG. 5C, Ddim7 has four values of D (293.7 Hz), F (349.2 Hz), G # (415.3 Hz), and B (493.9 Hz). Consists of single notes.

  Thus, if the sound output unit 106 outputs chords of Cdim7, C # dim7, and Ddim7, all the sounds of 12 scales within one octave can be covered only by outputting the chord three times. Therefore, not only can the uncomfortable feeling given to the user be reduced, but also a test sound can be output efficiently in a short time.

  In addition, the sound of 12 scales is not limited to the thing which belongs to the said 261.6Hz or more and 493,9Hz or less range. For example, a 12-scale sound belonging to a range of 533.3 Hz or more and 987.76 Hz or less one octave higher than this range may be output, or a 12-scale sound of an octave higher than this range may be output. Also good. The frequency of the 12-tone sound to be output may be appropriately selected according to the frequency range to be corrected.

  Note that the output of the three chords of the sound output unit 106 is performed at an appropriate timing, for example, after the power value of the frequency of the first chord is stored in the storage unit 111, the second chord is output. It is good to be told. Here, whether or not the power value of the frequency of the first chord is stored in the storage unit 111 is to detect whether or not a predetermined amount of data is stored in the storage unit 111 (buffer full detection). Can be detected.

  In addition, a silence period may be interposed between the first chord and the second chord (or between the second chord and the third chord). Thereby, the selection unit 110 can detect the silence period and start storing the power value (buffer fetch) in the storage unit 111. When the test sound is faded in, the selection unit 110 may detect the level after completion of the fade-in and start storing the power value in the storage unit 111.

  When the sound output unit 106 outputs a test sound, the gains of the speaker amplifier unit 105 and the microphone amplifier unit 22 are set appropriately. For example, when the acoustic device 10 notifies the control device 20 in advance using wireless communication before outputting the test sound, the gain of the microphone amplifier unit 22 is changed to a gain for acquiring the test sound. May be.

  When the sound output unit 106 outputs a test sound, the sound collection unit 21 acquires the output test sound (S12). The sound collection unit 21 outputs the acquisition result (sound signal) to the microphone amplifier unit 22 and is amplified by the microphone amplifier unit 22.

  Subsequently, the transmission unit 23 transmits the amplified acquisition result to the reception unit 108 of the acoustic device 10 (S13). And the signal processing part 120 correct | amends the frequency characteristic of the sound output from the sound output part 106 based on the acquisition result which the receiving part 108 received (S14). FIG. 6 is a diagram conceptually illustrating correction of frequency characteristics.

  FIG. 6A is a diagram illustrating frequency characteristics before correction at the listening position. Here, assuming that the ideal frequency characteristic is a substantially flat characteristic, the portion that protrudes greatly in the vertical direction in FIG. 6A needs to be corrected.

  Therefore, the filter coefficient calculation unit 112 calculates filter coefficients that give characteristics as shown in FIG. Then, the filter unit 104 performs a filtering process that gives the characteristics shown in FIG. 6B to the frequency characteristics before correction shown in FIG. It is corrected as shown in c). That is, the corrected frequency characteristic at the listening position approaches an ideal frequency characteristic.

[Effects]
As described above, the acoustic device 100 according to Embodiment 1 includes the acoustic device 10 and the control device 20. The control device 20 controls the acoustic device 10 based on the sound collection unit 21 that acquires sounds around the control device 20 including the sound of the user 30 and the sound of the user 30 acquired by the sound collection unit 21. And a transmission unit 23 that transmits the control signal to the acoustic device 10. The acoustic device 10 causes the sound collection unit 21 to acquire the sound output unit 106 and each of the 12 scale sounds constituting one octave to correct the frequency characteristics of the sound output from the sound output unit 106. And a signal processing unit 120 that causes the sound output unit 106 to output. Note that the 12-scale sound output as the test sound is output in such a manner that the user 30 can distinguish and recognize the sound of each scale.

  When each of 12 scale sounds constituting one octave is output as a test sound like the sound device 100, such a test sound is not a stimulating sound compared to the white noise and the TSP sound. Moreover, since information of at least 12 scales (12 spectra) can be acquired, it is possible to appropriately correct the frequency characteristics. That is, the acoustic device 100 can correct the frequency characteristics while reducing discomfort given to the user 30.

  Further, in the acoustic device 100, only a sound having a specific frequency (for 12 scales) is used as a test sound, and thus the amount of information stored for calculating the filter coefficient (for each frequency stored in the storage unit 111). The number of power values) is less than when white noise is used. That is, there is an advantage that storage resources can be reduced.

  For the same reason, when 12-scale sound is used, when it is desired to obtain information with the same S / N ratio as when white noise is used, the test is performed when the 12-scale sound is used. Sound volume is low. In other words, if a test sound having the same volume is output, information with a higher S / N ratio can be obtained when a 12-scale sound is used than when white noise is used.

  Further, specifically, the signal processing unit 120 of the acoustic device 100 causes the sound output unit 106 to sequentially output each of Cdim7, C # dim7, and Ddim7 as test sounds.

  Thus, if the sound output unit 106 outputs chords of Cdim7, C # dim7, and Ddim7, all the sounds of 12 scales within one octave can be covered only by outputting the chord three times.

  For example, the sound may be output by sweeping the frequency. However, when the chord is output three times as described above, the test is performed in a shorter time than when the sound is output by sweeping the frequency. Sound can be output.

[Modification 1]
Note that the signal processing unit 120 may sequentially output each of a plurality of types of chords, each of which is part of a 12-scale sound, to the sound output unit 106 as a test sound. That is, chords output as test sounds are not limited to Cdim7, C # dim7, and Ddim7.

  Here, depending on the combination of chords, a single note of the same scale may be output in duplicate. In such a case, it is preferable that the frequency power values of the overlapping single notes are normalized and used. In this case, a component (normalization circuit) for performing normalization is provided between the selection unit 110 and the storage unit 111, for example.

  In addition, when a single note of the same scale is output in duplicate, either the average value, maximum value, minimum value, or median value of the frequency power values of the duplicated notes is the frequency power value of the note. May be used.

  Note that if a chord is output as the test sound, overflow may occur. Therefore, the signal generation unit 101 may lower the peak value of the time axis waveform by adjusting the phase of a single tone constituting the chord. Thereby, the occurrence of overflow can be suppressed.

  Further, the signal processing unit 120 may cause the sound output unit 106 to output a melody composed of a single tone (or composed of a single tone and a chord) instead of a chord as a test sound. That is, the signal processing unit 120 may cause the sound output unit 106 to sequentially output each of the 12 scale sounds as test sounds. Also in this case, when a single note of the same scale is output redundantly, the above normalization is performed. When a melody consisting of a single tone is used as a test sound, the output of the test sound is continued until each of the 12 scale sounds is output.

[Modification 2]
In the correction of the frequency characteristics performed by the acoustic device 100, since each of the 12 scale sounds constituting one octave is output as the test sound, the resolution per octave is 12.

  Here, in order to lower the resolution per octave, frequency power values may be integrated (merged). For example, when the resolution per octave is lowered to 6, the signal processing unit 120 obtains the frequency power values for 12 musical scales by dividing them into 6 groups of 2 musical scales and averaging each group. Six frequency power values may be used. In addition, the signal processing unit 120 selects six frequency power values from the frequency power values of 12 scales, and 3 of the selected frequency power value and two frequency power values adjacent to the selected frequency power value. Six frequency power values obtained by weighted addition of two frequency power values may be used.

  In addition, in order to increase the resolution per octave, the signal generation unit 101 may generate a test sound in which each of the sounds of the twelve scales is vibrato (with a wide frequency). In this case, the selection of the frequency by the selection unit 110 may be omitted.

[Modification 3]
The signal processing unit 120 may cause the sound output unit 106 to sequentially output Cdim7, C # dim7, and Ddim7 over a plurality of octaves as test sounds. For example, the signal processing unit 120 may cause the sound output unit 106 to sequentially output Cdim7, C # dim7, and Ddim7 over 5 octaves as test sounds. FIG. 7 is a diagram showing the frequency characteristics of the test sound over 5 octaves. 7A is a diagram showing the frequency characteristics of Cdim7 over 5 octaves, FIG. 7B is a diagram showing the frequency characteristics of C # dim7 over 5 octaves, and FIG. These are figures which show the frequency characteristic of Ddim7 over 5 octaves.

  Thus, by outputting a chord over a plurality of octaves as a test signal, the output time of the test sound can be greatly shortened (to 1 / octave number).

[Modification 4]
In the audio device 100, the filter coefficient calculation unit 112 included in the audio device 10 obtains the filter coefficient and outputs the filter coefficient to the filter unit 104. However, the control device 20 obtains the filter coefficient and sends the filter coefficient to the transmission unit 23. May be transmitted to the receiving unit 108 of the audio device 10.

  In this case, the control device 20 includes components having functions similar to those of the frequency analysis unit 109, the selection unit 110, the storage unit 111, and the filter coefficient calculation unit 112. The control device 20 amplifies the sound signal output from the sound collection unit 21 by the microphone amplifier unit 22, and based on the amplified signal, the frequency analysis unit, selection unit, storage unit, and filter coefficient calculation included in the control device 20 The filter coefficient is obtained using the unit, and the filter coefficient is output to the transmission unit 23. The signal processing unit 120 sets the filter coefficient received by the reception unit 108 in the filter unit 104.

  Thereby, the amount of data transmitted from the control device 20 to the audio device 10 can be significantly reduced.

(Embodiment 2)
[Constitution]
In the acoustic device 100 described above, the test signal is generated by the signal generation unit 101. However, an acoustic signal (a signal for outputting television sound or the like) obtained through the signal acquisition unit 102 may be used as the test signal. That is, TV sound may be used as the test sound.

  Hereinafter, the functional configuration of the acoustic device according to the second embodiment will be described. FIG. 8 is a block diagram illustrating a functional configuration of the acoustic device according to the second embodiment. In the following second embodiment, description will be made mainly on points different from the first embodiment, and description of components that are substantially the same as those of the first embodiment may be omitted.

  As illustrated in FIG. 8, the acoustic device 10 a included in the acoustic device 100 a according to the second embodiment does not include the signal generation unit 101 and the switching unit 103, but includes a frequency analysis unit 113 and a difference calculation unit 114. . The signal acquisition unit 102, the filter unit 104, the control unit 107, the reception unit 108, the frequency analysis unit 109, the selection unit 110, the storage unit 111, the filter coefficient calculation unit 112, the frequency analysis unit 113, and the difference calculation unit 114 The signal processing unit 120a is configured.

  The frequency analysis unit 113 performs an FFT process on the acoustic signal obtained through the signal acquisition unit 102 based on the control of the control unit 107. As a result, the acoustic signal after FFT processing (analysis result of the acoustic signal) is expressed by a power value for each frequency. Further, the frequency analysis unit 113 outputs the analysis result of the acoustic signal to the selection unit 110. The frequency analysis unit 109 is specifically realized by a circuit (frequency analysis circuit).

  The selection unit 110 selects a frequency of each of the 12 scale sounds from the analysis result, and stores the selected frequency and the power value of the frequency in the storage unit 111.

  In this way, the acoustic signal that is the object of analysis by the frequency analysis unit 113 is output from the sound output unit 106 as television sound and is acquired by the sound collection unit 21. Thereafter, as in the first embodiment, the television sound acquisition result is transmitted to the reception unit 108 by the transmission unit 23 and subjected to FFT processing by the frequency analysis unit 109.

  The selection unit 110 selects each frequency of the 12th scale sound from the acquisition result of the TV sound after the FFT process, and stores the selected frequency and the power value of the frequency in the storage unit 111.

  The difference calculation unit 114 refers to the storage unit 111, compares the power value included in the analysis result of the acoustic signal with the power value included in the acquisition result of the television sound for each frequency, and compares the power value for each frequency. The power value difference is calculated and output to the filter coefficient calculation unit 112. The difference calculation unit 114 is specifically realized by a circuit (difference calculation circuit).

  Then, the filter coefficient calculation unit 112 calculates a filter coefficient such that the difference becomes a predetermined value (for example, ± 1 dB) or less. The filter unit 104 performs a filter process using the filter coefficient calculated by the filter coefficient calculation unit 112.

[Effects]
As described above, the acoustic device 100a according to the second embodiment uses an acoustic signal (a signal for outputting television sound or the like) obtained through the signal acquisition unit 102 as a test signal. That is, the audio device 100a uses television sound as the test sound. Thereby, the acoustic device 100a can correct the frequency characteristic in a natural manner without giving the user 30 a sense of incongruity. Note that the frequency characteristic correction processing performed by the acoustic device 100a is continued until each of the 12 scale sounds is output by the television sound.

(Other embodiments)
As described above, Embodiments 1 and 2 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated in the said Embodiment 1-2 and it can also be set as a new embodiment.

  Thus, hereinafter, other embodiments will be described together.

  In the first and second embodiments, the example in which the technology in the present disclosure is applied to the TV system has been described. However, the technology in the present disclosure can be applied to, for example, an in-vehicle audio device or an in-vehicle navigation device having a hands-free (voice recognition) function. The technology in the present disclosure can also be applied to, for example, an audio device (mini component, AV center amplifier, or the like).

  In the first and second embodiments, when the sound output unit 106 outputs a test sound, the gain of the microphone amplifier unit 22 is adjusted. However, the gain of the speaker amplifier unit 105 may be adjusted.

  In each of the above embodiments, each component may be configured by dedicated hardware or may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.

  The comprehensive or specific aspect of the technology in the present disclosure may be realized by a recording medium such as a system, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM. The technology in the present disclosure may be realized by any combination of a system, a method, an integrated circuit, a computer program, or a recording medium. For example, the technology in the present disclosure may be realized as a frequency characteristic correction method executed by the acoustic device.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the attached drawings and detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to exemplify the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present disclosure is applicable to an audio device that corrects frequency characteristics. Specifically, the present disclosure is applicable to a television, an in-vehicle navigation device, an audio device, and the like.

DESCRIPTION OF SYMBOLS 10, 10a Audio equipment 11 Memory | storage part 20 Control apparatus 21 Sound collection part 22 Microphone amplifier part 23 Transmission part 30 User 100, 100a Sound apparatus 101 Signal generation part 102 Signal acquisition part 103 Switching part 104 Filter part 105 Speaker amplifier part 106, 106a Sound output unit 107 Control unit 108 Reception unit 109 Frequency analysis unit 110 Selection unit 111 Storage unit 112 Filter coefficient calculation unit 113 Frequency analysis unit 114 Difference calculation unit 120, 120a Signal processing unit 200 Indoor space 201 Direct sound 202 Primary reflected sound 203 Second Next reflected sound 204 Transmitted sound 205 Diffracted sound

Claims (8)

Sound equipment,
With control equipment,
The control device is
A sound collection unit for obtaining sounds around the control device including user's voice;
A control signal transmission unit that transmits a control signal for controlling the acoustic device to the acoustic device based on the voice of the user acquired by the sound collection unit;
The audio equipment is
The sound output section,
Signal processing for outputting each sound of 12 scales constituting one octave to the sound output section as a test sound to be acquired by the sound collection section in order to correct the frequency characteristics of the sound output from the sound output section And a sound device. The acoustic device according to claim 1, wherein the signal processing unit sequentially outputs a plurality of types of chords, each of which is a part of the sound of the 12 scales, to the sound output unit as the test sound. The acoustic device according to claim 2, wherein the signal processing unit sequentially outputs each of Cdim7, C # dim7, and Ddim7 to the sound output unit as the test sound. The acoustic device according to claim 3, wherein the signal processing unit sequentially outputs each of Cdim7, C # dim7, and Ddim7 over a plurality of octaves to the sound output unit as the test sound. The acoustic device according to claim 4, wherein the signal processing unit sequentially outputs each of Cdim7, C # dim7, and Ddim7 over 5 octaves to the sound output unit as the test sound. The acoustic device according to claim 1, wherein the signal processing unit sequentially outputs each of the 12 scale sounds as the test sound to the sound output unit. The sound collection unit acquires the test sound,
The control device further includes an acquisition result transmission unit that transmits an acquisition result of the test sound by the sound collection unit to the acoustic device,
The said signal processing part receives the said acquisition result which the said acquisition result transmission part transmitted, and correct | amends the frequency characteristic of the sound output from the said sound output part based on the received said acquisition result. The acoustic device according to any one of the above. A method for correcting frequency characteristics of sound output from the sound output unit, executed by an audio device including a sound output unit and a control device,
The control device is
A sound collection unit for obtaining sounds around the control device including user's voice;
A control signal transmission unit that transmits a control signal for controlling the acoustic device to the acoustic device based on the voice of the user acquired by the sound collection unit;
The correction method includes an output step of causing the sound output unit to output each of the 12 scale sounds constituting one octave as a test sound to be acquired by the sound collection unit for correcting the frequency characteristic. .

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