JP5549319B2 - Sound equipment and sound system - Google Patents

Description

  The present invention relates to an acoustic device that performs volume control of sound to be reproduced.

  In general, accompaniment sounds of an automatic performance device (for example, an automatic performance piano) are reproduced using an audio reproduction device (audio reproduction function) integrated with the automatic performance piano. In this case, since the volume of the automatic performance piano and the volume of the accompaniment music are managed together, it is easy to automatically adjust the volume balance.

  On the other hand, in recent years, it has been proposed that the accompaniment music sound be played back synchronously by a playback device different from the automatic performance device (see Patent Document 1).

JP 2010-55076 A

  However, when accompaniment sounds are played on different playback devices, the appropriate volume balance differs depending on the playback environment, such as speaker placement, listening position, room structure, etc., and it is difficult to adjust automatically. .

  Accordingly, an object of the present invention is to provide an audio device that easily realizes a function of automatically adjusting the volume balance between devices.

  The acoustic device according to the present invention includes a reproducing unit that reproduces sound, a sound collecting unit that collects an audio signal including a modulation component, and a volume of another device based on the modulation component included in the audio signal. Volume estimation means for estimation and volume control means for controlling the volume of the playback means according to the volume estimated by the volume estimation means are provided.

  In this case, if the audio signal contains a modulation component for estimating the volume of another device, the volume of the other device can be estimated by demodulating the modulation component, and the volume balance is automatically adjusted. can do.

  For example, when a spread code is included as a modulation component, the volume can be estimated from a change in correlation value (peak intensity). When the volume of the other device is increased, the SN ratio of the spread code is increased, so that the peak intensity of the correlation value is increased. Therefore, if the peak intensity increases, it is estimated that the volume of the other device has increased, and the volume of the device itself is increased. In this way, the volume balance can be automatically adjusted.

  If the modulation component includes volume information, the volume control can be performed by decoding the volume information. For example, when the bit code (0, 1) of the volume information is obtained by phase modulation (positive / negative inversion) of the spread code, the demodulation side can decode the bit data by determining whether the peak of the correlation value is positive or negative. .

  The modulation component may include synchronization information indicating the content reproduction timing. For example, if a reference clock conforming to MIDI is superimposed as synchronization information, the playback side can perform an automatic performance by operating a sequencer with the decoded reference clock, and the collected audio signal and the own device can be used. The audio to be played can be synchronized.

  Moreover, the aspect provided with the superimposition means which superimposes a new modulation component on the audio | voice which an own apparatus reproduces in the said audio equipment is also possible. In this case, the sound collecting means further picks up the sound reproduced by the own apparatus, the sound volume estimating means demodulates the superimposed new modulation component to further estimate the sound volume of the own apparatus, and the sound volume control means The volume balance is determined based on each volume. That is, since the volume control is performed in consideration of the volume of the own apparatus in addition to the volume of the other apparatus, it is possible to adjust to a more accurate volume balance.

  Further, an aspect in which an acoustic system including a plurality of acoustic devices is configured, and each acoustic device includes a superimposing unit that superimposes a new modulation component on the sound reproduced by the own device is also possible. In this case, the sound collection means collects the sound reproduced by the other acoustic equipment, and the volume estimation means estimates the volume of the other acoustic equipment based on the modulation component included in the collected sound signal. Thus, the volume can be adjusted between a plurality of devices.

  According to the present invention, the function of automatically adjusting the volume balance can be easily realized even when the accompaniment music sound is reproduced by another device.

It is a block diagram which shows the main structures of an acoustic system. 2 is a block diagram showing a configuration of a playback device 1. FIG. 3 is a block diagram showing a configuration of a playback device 2. FIG. It is a block diagram which shows the structure of the reproducing | regenerating apparatus 1 which concerns on another example. Furthermore, it is a block diagram which shows the structure of the reproducing | regenerating apparatus 2 in the case of superimposing a modulation component. It is a block diagram which shows the main structures of the acoustic system in the case of providing two or more speakers. It is a block diagram which shows the structure of the reproducing | regenerating apparatus 2 in the case of providing a plurality of speakers. It is a block diagram which shows the main structures of the acoustic system in the case of providing the reproducing | regenerating apparatus 2 and performing volume adjustment mutually. It is a block diagram which shows the structure of the acoustic system in the case of performing automatic volume adjustment using a remote control. It is a block diagram which shows the structure of the reproducing | regenerating apparatus 2 and the remote control 5 in the case of performing automatic volume adjustment using a remote control. It is a block diagram which shows the structure of the acoustic system in the case of using an analysis server. It is a block diagram which shows the structure of the reproducing | regenerating apparatus 2 and the analysis server 9 in the case of using an analysis server. It is a block diagram which shows the structure of the reproducing | regenerating apparatus 2 and the analysis server 9 when an analysis server is used and a content is specified.

  FIG. 1 is a diagram illustrating a configuration of an acoustic system according to an embodiment of the present invention. The acoustic system is composed of a plurality of playback devices, and in the example of FIG. A speaker 10 is connected to the playback device 1, and a speaker 20 is connected to the playback device 2. The playback device 1 and the playback device 2 play predetermined content and emit sound from the speaker 10 and the speaker 20, respectively.

  The microphone 30 is installed at a listening position (near the listener). The microphone 30 collects the listening sound (sound emitted from the speaker 10 and the speaker 20) at the listening position and outputs the collected sound signal to the playback device 2. The playback device 2 estimates the volume of the playback device 1 based on the modulation component included in the audio signal picked up by the microphone 30, and controls the playback volume of the device itself to automatically adjust the volume balance with the playback device 1. To be adjusted.

  In the example shown in the figure, an example in which the microphone 30 is installed at a listening position away from the installation position of the playback device 2 is shown. However, the microphone 30 may be built in the playback device 2. Good. Since the sound pressure is inversely proportional to the square of the distance, the volume at the listening position can be estimated when the positional relationship between the playback device 1, the playback device 2, and the listening position is known. For example, when the interval between the playback device 1 and the playback device 2 is 3 m and the listener listens at an intermediate position between the devices (a position 1.5 m away from the playback device 1 and the playback device 2), playback is performed at the listening position. It can be determined that the sound having a volume approximately four times the sound volume picked up by the device 2 has arrived.

  FIG. 2A is a block diagram showing the configuration of the playback apparatus 1. The playback device 1 includes a control unit 11, a content data storage unit 12, a playback unit 13, a superimposition unit 14, an operation unit 15, and a volume adjustment unit 16.

  The content data storage unit 12 stores content data such as compressed audio such as MP3 and music data (MIDI data).

  The reproduction unit 13 reads content data from the content data storage unit 12 and reproduces sound. When the content data is compressed audio, the playback unit 13 decodes the audio data and outputs the audio signal to the superimposition unit 14. When the content data is MIDI data, the playback unit 13 controls a sound source (not shown) to generate a musical sound (sound signal) and outputs it to the superimposing unit 14.

  The superimposing unit 14 superimposes the modulation component on the audio signal input from the reproducing unit 13. The audio signal on which the modulation component is superimposed is adjusted in volume by the volume adjustment unit 16 and emitted from the speaker 10. The volume adjustment amount of the volume adjustment unit 16 is controlled by the control unit 11. The control unit 11 sets the volume adjustment amount according to the operation of the operation unit 15 in the volume adjustment unit 16.

  The superimposing method of the superimposing unit 14 uses a technique that makes it difficult to hear the modulation component. For example, a spreading code (PN code) such as an M sequence or a Gold sequence is superimposed on a high band at a weak level that does not cause a sense of discomfort. When a modulation component such as a spread code is preliminarily superimposed on the content data, the configuration of the playback device 1 does not require the superimposing unit 14 as shown in FIG.

  FIG. 2B is a block diagram illustrating an example of the configuration of the superimposing unit 14. The superimposing unit 14 includes an LPF 140, an adder 141, a spread code generating unit 142, and an HPF 143.

  The spreading code generation unit 142 periodically generates an M-sequence spreading code in accordance with an instruction from the control unit 11 and outputs it to the HPF 143. The spreading code band-limited by the HPF 143 is combined with the content audio signal by the adder 141. The audio signal of the content is limited to a band different from the frequency component of the spread code by the LPF 140.

  Note that the pass band of the HPF 143 is desirably a non-audible range of 20 kHz or more. However, in a configuration where the non-audible range cannot be used due to D / A conversion, compression audio encoding, or the like, for example, a band of about 10 to 15 kHz Even if it exists, the influence on audibility can be reduced. Also, in this example, the LPF 140 completely divides the content audio signal and the spread code band, but even if the content audio signal and the pseudo noise frequency component are slightly overlapped, it is modulated by the listener. It is possible to ensure an S / N ratio that makes it difficult to hear the signal and demodulates the modulation component on the sound collection side.

  The playback device 2 picks up the sound on which the spread code as described above is superimposed by the microphone 30, calculates a correlation value between the collected sound signal and the same spread code on the superimposition side, and calculates the calculated correlation value The volume of the playback device 1 is estimated according to the peak intensity. FIG. 3A is a block diagram illustrating a configuration of the playback device 2. The playback device 2 includes an operation unit 21, a control unit 22, a demodulation unit 24, a content data storage unit 25, a playback unit 26, and a volume adjustment unit 27.

  The content data storage unit 25 stores content data such as compressed audio such as MP3 and music data (MIDI data). The reproduction unit 26 reads content data from the content data storage unit 25 and reproduces sound. The content to be reproduced is instructed by the control unit 22 according to the operation of the operation unit 21.

  The sound signal output from the reproduction unit 26 is adjusted in volume by the volume adjustment unit 27 and emitted from the speaker 20. The adjustment amount of the volume adjustment unit 27 is controlled by the control unit 22. The control unit 22 estimates the volume of the playback device 1 based on the demodulation result in the demodulation unit 24 and determines the volume adjustment amount of the volume adjustment unit 27.

  FIG. 3B is a block diagram illustrating a configuration of the demodulator 24 and a functional configuration for performing sound volume estimation in the controller 22. The demodulator 24 includes an HPF 241 and a correlator 245. The sound collected by the microphone 30 is input to the HPF 241. The HPF 241 is a filter for removing the audio signal component of the content, and the same pass band as the pass band of the HPF 143 is set. The output signal of the HPF 241 is input to the correlator 245.

  The correlator 245 includes an FIR filter (matched filter) in which the spreading code generated by the spreading code generator 142 is set as a filter coefficient, and obtains a correlation value between the input speech signal and the spreading code. Since the spreading code uses a code having a high autocorrelation such as an M sequence or a Gord sequence, a peak component is extracted from the correlation value output from the correlator 245 at the cycle of the spreading code. The correlation value (peak intensity) at the extracted peak is output to the control unit 22. The control unit 22 functionally includes a volume estimation unit 221 and a volume value storage unit 222, and the volume estimation unit 221 refers to the volume value storage unit 222 with the peak intensity input from the correlator 245. The volume of the playback device 1 is estimated. That is, the volume value storage unit 222 stores the estimated volume value of the playback device 1 with respect to the peak intensity, and the volume estimation unit 221 reads the estimated volume value corresponding to the extracted peak intensity, thereby Can be estimated. The control unit 22 sets the adjustment amount of the volume adjustment unit 27 according to the estimated volume value.

  The volume value with respect to the peak intensity may be stored in a database by changing the volume of the playback device 1 when each apparatus is first installed (initial setting), measuring the peak intensity at each volume, One or several points of data may be stored, and the volume value may be calculated each time. When the microphone 30 is fixed, when the control unit 11 of the playback device 1 changes the volume adjustment amount of the volume adjustment unit 16, the volume of the spread code also changes and the SN ratio changes. This corresponds to a change in volume at the listening position. For example, when the control unit 11 sets the volume adjustment amount of the volume adjustment unit 16 large in accordance with the operation of the operation unit 15 of the playback device 1, the SN ratio of the spread code increases and the peak intensity increases. Therefore, the volume estimation unit 221 estimates that the volume of the playback apparatus 1 has increased when the peak intensity increases, and increases the volume of the own apparatus.

  In this way, the playback device 2 can estimate the volume of the playback device 1 and automatically adjust the volume balance with the playback device 1. For example, even when the playback device 1 plays back a piano sound and the playback device 2 plays back an accompaniment sound, the playback device 2 changes the volume in accordance with the volume of the playback device 1, so that an appropriate volume balance is always maintained. Will be played.

  In addition, the playback device 1 may be configured to superimpose its own volume adjustment amount on the audio signal as volume information, and the playback device 2 may perform volume adjustment by demodulating the superimposed volume information. The volume information superimposing method may be any method, for example, by phase-modulating the spreading code with volume information (0, 1 data code string).

  FIG. 2C is a block diagram illustrating an example of the configuration of the superimposing unit 14 when using spread spectrum. In this example, the multiplier 144 multiplies the M-sequence spread code output from the spread code generator 142 and the volume information (a code string binarized into −1 and 1) by the multiplier 144, thereby phase-modulating the spread code. That is, when the data code is 1, the phase is normal and when the bit data is 0, the phase is inverted.

  The spread code after phase modulation is input to the XOR circuit 145. The XOR circuit 145 outputs an exclusive OR of the code input from the multiplier 144 and the output code one sample before input via the delay unit 146. The signal after differential encoding is binarized by -1,1. By outputting the differential code binarized to −1 and 1, the demodulation side can extract the spreading code before differential encoding by multiplying the differential code of two consecutive samples.

  Then, the differentially encoded spreading code is band-limited within the baseband by the LPF 147 and input to the multiplier 148. The multiplier 148 multiplies the carrier signal output from the carrier signal generator 149 (carrier signal higher in frequency than the audio signal of the content) and the output signal of the LPF 147, and frequency-shifts the spread code after differential encoding to the passband. To do. The spread code after differential encoding may be frequency shifted after up-sampling. The spread code after the frequency shift is combined with the audio signal by the adder 141.

  As described above, the sound on which the data code string (volume information) is superimposed is emitted.

  FIG. 3C is a block diagram showing the configuration of the demodulator 24 when decoding volume information. The audio signal input to the demodulator 24 is input to the HPF 241. The output signal of the HPF 241 is input to the delay unit 242 and the multiplier 243. The delay amount of the delay unit 242 is set to a time corresponding to one sample of the differential code. When the differential code is upsampled, it is set to the time for one sample after the upsampling. The multiplier 243 multiplies the signal input from the HPF 241 by the signal one sample before output from the delay unit 242, and performs delay detection processing. The differentially encoded signal is binarized to −1 and 1, and indicates the phase change from the code one sample before. Therefore, by multiplying the signal one sample before, the difference is obtained. Volume information (spread code) before moving encoding is extracted.

  The output signal of the multiplier 243 is extracted as a baseband signal via the LPF 244 and input to the correlator 245. From the correlation value output by the correlator 245, the peak detector 246 extracts positive and negative peak components in the spreading code period (data code period). The code determination unit 247 decodes each peak component as a data code (0, 1) of the volume information.

  The control unit 22 estimates the volume of the playback device 1 according to the volume information decoded by the demodulation unit 24 and adjusts the volume of the volume adjustment unit 27. As described above, the volume balance with the playback device 1 can be automatically adjusted.

  In addition, the superimposition part 14 may superimpose not only volume information but other information. For example, the playback device 1 and the playback device 2 may perform synchronized playback of content by superimposing information for specifying the content to be played back and synchronization information indicating the playback timing of the content.

  When performing synchronized playback, the playback device 1 may superimpose information indicating the passage of time from the start of playback as synchronization information, and the playback device 2 may play back sound according to the information indicating the passage of time. However, when the content data is in a format conforming to MIDI data, it is also possible to perform synchronous reproduction using the peak extraction timing of the spread code as a reference clock. In this case, the control unit 11 sets the superimposition unit 14 to output the spread code at the time interval of the reference clock. The playback unit 26 of the playback apparatus 2 can perform an automatic performance by operating a sequencer using a peak of a correlation value calculated periodically as a reference clock.

  If information on the time difference between the musical sound generation timing and the reference clock is superimposed, it is possible to perform synchronized reproduction with higher accuracy on the demodulation side. If performance information such as note number and velocity is also superimposed, automatic performance can be performed without storing MIDI data on the demodulation side.

  Note that the estimation of the volume based on the peak intensity and the decoding of various kinds of information based on the phase modulation can be performed simultaneously. For example, the synchronization information is decoded and the synchronized reproduction is performed while estimating the volume by the peak intensity.

  In the above-described example, the configuration is shown in which the playback device 1 plays back the content and emits the sound as sound from the speaker 10. However, the musical sound using an automatic musical instrument (for example, an automatic performance piano) connected to the playback device 1 is shown. It is also possible to adopt a mode for generating. The automatic performance piano is an acoustic musical instrument that performs keystrokes by operating a solenoid attached to a key action inside the piano according to input MIDI data.

  In this case, the playback apparatus 1 includes a control unit 11, a content data storage unit 12, an operation unit 15, a volume adjustment unit 16, a playback control unit 17, and a modulated audio generation unit 18, as shown in FIG. It becomes composition. The reproduction control unit 17 reads the MIDI data stored in the content data storage unit 12 and adjusts the volume parameter such as velocity, and then outputs it to the automatic musical instrument 19. The adjustment amount of the volume parameter of the reproduction control unit 17 is adjusted by the control unit 11.

  The modulated audio generation unit 18 has the same configuration as the superposition unit 14 shown in FIGS. 2B and 2C, but as shown in FIG. 4C or FIG. The configuration of the LPF 140 and the adder 141 that are systems to which the audio signal is input is omitted, and the spread code is directly output to the speaker 10. That is, in this example, only the modulated sound is output from the speaker 10.

  4C, when the control unit 11 adjusts the volume parameter of the playback control unit 17 by operating the operation unit 15, the control unit 11 changes the volume adjustment amount of the volume adjustment unit 16, The volume of the modulated sound is changed according to the volume change of the automatic musical instrument 19. Alternatively, the modulated sound on which the volume information corresponding to the volume parameter of the automatic musical instrument 19 is superimposed is emitted. Thus, the playback device 2 can estimate the volume of the automatic musical instrument 19 and automatically adjust the volume balance with the automatic musical instrument 19.

<< Application Example 1 >>
FIG. 5A is a block diagram illustrating a configuration of the playback device 2 according to the application example 1. In this case, the playback apparatus 2 includes a superimposition unit 28 that superimposes the modulation component on the audio reproduced by the playback unit 26 in addition to the configuration shown in FIG.

  The configuration of the superposition unit 28 is the same as the configuration of the superposition unit 14 illustrated in FIG. 2B or 2C. In this case, the playback device 2 emits sound from the speaker 20 on which the modulation component for estimating the sound volume at the listening position (position where the microphone 30 is installed) is superimposed. However, the spreading code to be superimposed by the reproduction apparatus 2 uses a code different from the spreading code to be superimposed by the reproduction apparatus 1.

  In this case, as shown in FIG. 5B, the demodulator 24 inputs the collected audio signals to the plurality of correlators 245 and correlates the spread value with the spreading code superimposed by the reproducing apparatus 1 and the reproducing apparatus. 2 and the correlation value with the spreading code superimposed at 2 are calculated separately. The volume estimation unit 221 estimates the volume of the playback device 1 and the volume of the playback device 2 (volume at the listening position) based on the peak intensities input from the correlators 245, and has a preset volume balance. Thus, the volume of the volume adjustment unit 27 is set.

  With the above configuration, it is possible to adjust to a more accurate volume balance even when the reproduction environment such as the speaker arrangement, listening position, and room structure of each reproduction apparatus is changed.

<< Application Example 2 >>
FIG. 6 is a block diagram illustrating a configuration of an acoustic system according to Application Example 2. In this example, a plurality of speakers 20 </ b> A and 20 </ b> B are connected to the playback device 2. In this case, as shown in FIG. 7, the playback device 2 includes a superimposing unit 28A and a volume adjusting unit 27A in the output system of the speaker 20A, and includes a superimposing unit 28B and a volume adjusting unit 27B in the output system of the speaker 20B. .

  In this case, a different spreading code is superimposed for each speaker. That is, the spreading code superimposed on the sound emitted from the speaker 10 of the playback apparatus 1, the spreading code superimposed on the sound emitted from the speaker 20A, and the spreading code superimposed on the sound emitted from the speaker 20B are different. Become. The demodulator 24 includes as many correlators as the number of speakers, obtains correlation values with different spreading codes, and performs demodulation.

  As described above, the number of speakers connected to the playback device 1 and the playback device 2 is not limited to one, and even if there are a plurality of speakers, the volume can be estimated by using different spreading codes for each speaker. Volume balance can be adjusted automatically.

<< Application Example 3 >>
Next, FIG. 8 is a block diagram illustrating a configuration of an acoustic system according to Application Example 3. In this example, a plurality of playback devices 2 are provided, and a speaker 20 is connected to each. The configuration of the reproduction apparatus 2 in this example includes a superimposition unit 28 that superimposes a modulation component on the audio reproduced by the reproduction unit 26, as shown in FIG.

  In this case, each playback device 2 is configured to demodulate the modulation component of the sound emitted from the speaker of the other device, estimate the volume of the other device, and change the volume adjustment amount. The configuration is to be estimated. In this case, the volume adjustment amount of one of the playback devices 2 may be used as a reference, and the other playback device 2 may be configured to change the volume adjustment amount.

<< Application Example 4 >>
FIG. 9 is a block diagram illustrating a configuration of an acoustic system according to Application Example 4. In this example, a remote controller 5 having a built-in microphone 51 is provided instead of the microphone 30 with respect to the acoustic system of FIG. The remote controller 5 may be a dedicated device, but can also be realized by a device such as a digital audio player or the like that includes a microphone and a processor such as a CPU. In this example, the remote controller 5 and the playback device 2 perform wireless communication such as wireless LAN and infrared communication.

  FIG. 10 is a block diagram illustrating configurations of the playback device 2 and the remote controller 5 according to the application example 4. In this case, the playback device 2 has a configuration in which the operation unit 21 and the demodulation unit 24 are omitted from the playback device 2 illustrated in FIG. The function of the operation unit 21 is realized by the operation unit 53 of the remote controller 5, and the function of the demodulation unit 24 is realized by the demodulation unit 54 of the remote controller 5.

  That is, the remote controller 5 inputs the audio signal collected by the microphone 51 to the demodulator 54, calculates the peak intensity of the correlation value, and outputs it to the controller 55. Alternatively, the remote controller 5 outputs the volume information decoded by the demodulator 54 to the controller 55. The control unit 55 outputs the estimated volume value calculated from the peak intensity of the correlation value and the input volume information to the control unit 22 of the playback apparatus 2 via wireless communication. The control unit 22 changes the volume adjustment amount of the volume adjustment unit 27 based on the estimated volume value and volume information received via wireless communication.

<< Application Example 5 >>
FIG. 11 is a block diagram illustrating a configuration of an acoustic system according to Application Example 5. In this example, the playback device 2 is connected to the analysis server 9 via a network 7 such as the Internet.

  FIG. 12 is a block diagram illustrating configurations of the playback device 2 and the analysis server 9 according to the application example 5. The analysis server 9 includes a control unit 92 and a demodulation unit 94. The playback apparatus 2 in this example has a configuration in which the demodulator 24 is omitted from the playback apparatus 2 shown in FIG.

  In this example, the control unit 22 transmits the audio signal collected by the microphone 30 to the control unit 92 of the analysis server 9 via the network 7. The control unit 92 inputs the received audio signal to the demodulation unit 94. The demodulator 94 has the same configuration and function as the demodulator 24 shown in FIG. 3A, and demodulates the peak intensity and volume information of the correlation value. The control unit 92 calculates a sound volume estimated value obtained by estimating the sound volume adjustment amount of the playback device 1 based on the demodulated peak value of the correlation value, and transmits the sound volume estimated value to the control unit 22 of the playback device 2. Alternatively, the control unit 92 transmits the demodulated volume information to the control unit 22 of the playback device 2. The control unit 22 of the playback device 2 changes the volume adjustment amount of the volume adjustment unit 27 based on the received volume estimation value and volume information.

  As described above, the sound signal collected by the microphone is analyzed by the analysis server, and the playback device 2 can transmit the collected sound signal and receive the analysis result to perform the operation. .

<< Application Example 6 >>
FIG. 13 is a block diagram illustrating configurations of the playback device 2 and the analysis server 9 according to the application example 6. The analysis server 9 includes a content information storage unit 95 in addition to the configuration shown in FIG. In addition, the playback device 2 in this example has the same configuration as the example shown in FIG.

  In this example, the demodulator 24 of the playback device 2 demodulates information for specifying the content in addition to the volume information. That is, in addition to the volume information, the superimposing unit 14 of the playback apparatus 1 includes information for specifying the content being played back by the own apparatus (song information such as a song name and singer name, a song ID unique to each song, etc. ) Is superimposed on the audio signal. The control unit 22 of the playback device 2 transmits the demodulated volume information and content specifying information of the playback device 1 to the control unit 92 of the analysis server 9 via the network 7.

  The control unit 92 refers to the content information storage unit 95 with the received content specifying information. As shown in FIG. 13B, the content information storage unit 95 describes the reference volume for each content, and the control unit 92 reads the reference volume of the content corresponding to the received content specifying information. Then, the control unit 92 calculates the volume to be played by the playback device 2 based on the reference volume and the received volume information of the playback device 1. For example, when the playback device 2 plays back the same content as the playback device 1, the volume shortage of the playback device 1 with respect to the reference volume is set as the volume of the playback device 2 so that the reference volume is reached at the listening position. When the playback device 2 plays back content different from that of the playback device 1 (for example, when playing back accompaniment sound content related to piano sound content of the same song), the content information storage unit 95 is shown in FIG. Thus, the reference volume for each content (each part) is stored. Then, the control unit 92 calculates the volume of the playback device 2 so that the volume ratio between the playback device 1 and the playback device 2 becomes the ratio of the reference volume between parts.

  At this time, the playback device 2 may transmit information for specifying the content (part) to be played back to the analysis server 9. Further, the playback device 2 transmits information indicating the playback function (audio playback function, automatic performance function, etc.) of the own device to the analysis server 9, and the analysis server 9 specifies the content (part) to be played back by the playback device 2. The reproduction volume of the content may be calculated. In this case, the playback device 2 receives information indicating the content specified by the analysis server 9 and plays back the content indicated by the received information.

  The control unit 92 of the analysis server 9 transmits various information such as the volume calculated as described above to the control unit 22 of the playback device 2. Based on the received information, the control unit 22 of the playback device 2 plays back the content and changes the volume adjustment amount of the volume adjustment unit 27. In this way, the playback device 2 can perform an operation of specifying the content being played back by the playback device 1, and the volume information can be downloaded from the server.

DESCRIPTION OF SYMBOLS 1 ... Playback apparatus 2 ... Playback apparatus 10 ... Speaker 11 ... Control part 12 ... Content data storage part 13 ... Playback part 14 ... Superimposition part 15 ... Operation part 16 ... Volume adjustment part 17 ... Playback control part 18 ... Modulation sound generation part 19 ... automatic musical instrument 20 ... speaker 21 ... operation unit 22 ... control unit 24 ... demodulation unit 25 ... content data storage unit 26 ... reproduction unit 27 ... volume adjustment unit 28 ... superimposition unit 30 ... microphone

Claims (5)

Playback means for playing back audio;
Sound collection means for collecting an audio signal including a modulation component;
Volume estimation means for estimating the volume of another device based on the modulation component included in the audio signal;
Volume control means for controlling the volume of the playback means according to the volume estimated by the volume estimation means;
Equipped with a,
The modulation component included in the audio signal includes a predetermined spreading code,
The sound volume estimation unit calculates a correlation value between the collected sound signal and the predetermined spreading code, and estimates a volume of another device based on the calculated intensity of the correlation value . The modulation component included in the audio signal includes volume information of a device that has output the audio signal,
Acoustic device according to claim 1 wherein the volume estimating means, for demodulating the sound volume information, and estimates the volume of other devices based on the volume information obtained by demodulating. The modulation component included in the audio signal includes synchronization information indicating the reproduction timing of the content,
On the basis of the synchronization information, the acoustic apparatus according to claim 1 or claim 2 comprising a synchronizing means for audio and the reproduction means of another device synchronizes the playback audio. Comprising superimposing means for superimposing a new modulation component on the sound reproduced by the reproducing means;
The sound collection means further collects the sound reproduced by the reproduction means,
The sound volume estimation means further estimates the sound volume of the device based on the new modulation component,
The audio device according to any one of claims 1 to 3 , wherein the volume control unit determines a volume balance based on each estimated volume and controls the volume of the reproduction unit. An acoustic system comprising a plurality of the acoustic devices according to any one of claims 1 to 3 ,
Each acoustic device includes superimposing means for superimposing a new modulation component on the sound reproduced by the reproducing means,
The sound collecting means picks up the sound reproduced by the reproducing means of another acoustic device as the sound signal,
The sound volume estimation means estimates a sound volume of another sound device based on a modulation component included in the sound signal.

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