WO2017203677A1

WO2017203677A1 - Audio signal processing device and sound parameter determination method

Info

Publication number: WO2017203677A1
Application number: PCT/JP2016/065674
Authority: WO
Inventors: 青木良太郎; 加納真弥; 臼井篤志; 関口康平
Original assignee: ヤマハ株式会社
Priority date: 2016-05-27
Filing date: 2016-05-27
Publication date: 2017-11-30

Abstract

According to the present invention, a signal processing unit (4) performs, in accordance with a sound parameter being set therein, sound signal processing on an inputted audio signal. A storage unit (9) stores association information that associates attribute information of a speaker (20) and the sound parameter. An operation unit (10) accepts the attribute information of the speaker (20) as a setting input. A control unit (2) determines a sound parameter corresponding to the setting input using the association information stored in the storage unit (9), and sets the determined sound parameter in the signal processing unit (4). The control unit (2) further determines a sound parameter that contains a first parameter for enhancing a low-band component.

Description

Audio signal processing apparatus and acoustic parameter determination method

The present invention relates to a technique for performing acoustic signal processing on an input audio signal.

Conventionally, there is an audio signal processing apparatus that performs acoustic signal processing for adjusting frequency characteristics of an input audio signal. The acoustic signal processing is performed according to the set acoustic parameter. The audio signal processing device performs an audio signal process and outputs an audio signal whose frequency characteristics are adjusted.

In order for users to view content such as music and movies with high sound quality, the performance of the speakers connected to the audio signal processing device (speakers to which audio signals with adjusted frequency characteristics are input) and the sound depending on the installation location, etc. It is necessary to set parameters. The acoustic parameters include various types of parameters such as a parameter relating to equalizer (EQ) and a parameter relating to loudness correction. Setting the acoustic parameters is a complicated operation for the user and is difficult to set appropriately.

Patent Document 1 describes an in-vehicle audio apparatus configured to easily set acoustic parameters (acoustic characteristic correction data). Patent document 1 is a structure which sets an acoustic parameter automatically according to the vehicle type name (or vehicle type) input by the user, and the kind of speaker. That is, the user can set the acoustic parameters by performing an operation of inputting the vehicle type name (or vehicle type) and the type of speaker.

JP 2001-301536 A

However, Patent Document 1 only describes that an acoustic parameter for correcting the characteristic of the equalizer (EQ) is set according to the vehicle model name and the type of the speaker.

An object of the present invention is to provide a technique capable of easily setting an acoustic parameter for improving sound quality near the lowest frequency that can be output by a speaker.

The audio signal processing apparatus of the present invention is configured as follows to achieve the above object.

The audio signal processing unit performs acoustic signal processing on the input audio signal according to the set acoustic parameters. The storage unit stores related information associating speaker attribute information with acoustic parameters. The setting input receiving unit receives speaker attribute information as a setting input. A control part determines the acoustic parameter set to an audio signal processing part according to the relevant information which a memory | storage part memorize | stores, and the setting input which the setting input reception part received.

The speaker attribute information may be information indicating the type of speaker, information indicating the installation location of the speaker, or both.

Also, the acoustic parameter determined by the control unit includes a first parameter that enhances the low frequency component.

Therefore, the user can easily set the acoustic parameters for improving the sound quality of the low frequency component.

According to the present invention, it is possible to easily set an acoustic parameter that improves the sound quality near the lowest frequency that can be output by the speaker.

It is a block diagram which shows the structure of the principal part of an audio signal processing apparatus. It is a flowchart which shows the process in which a control part judges the acoustic parameter set to a signal processing part. It is a figure which shows the judgment result of five points based on a setting input. It is a figure which shows the effect | action of each parameter with respect to an audio signal. It is a block diagram which shows the structure of the principal part of the audio signal processing apparatus concerning another example. It is a block diagram which shows the structure of the principal part of a terminal. It is a block diagram which shows the structure of the principal part of the audio signal processing apparatus concerning another example.

Hereinafter, an audio signal processing apparatus according to an embodiment of the present invention will be described.

FIG. 1 is a block diagram showing a configuration of a main part of an audio signal processing apparatus according to this example. The audio signal processing device 1 includes a control unit 2, an input unit 3, a signal processing unit 4, a level adjustment unit 5, an amplification unit 6, an output unit 7, a master volume 8, a storage unit 9, and an operation. Part 10. The number of channels of the digital audio signal input to the audio signal processing device 1 may be monaural, stereo, or a mode in which a larger number of channels (three or more channels) are input. Also good. Here, for simplification of description, processing of a one-channel audio signal will be described.

The control unit 2 controls the main body of the audio signal processing device 1. Further, the control unit 2 sets the acoustic parameter in the signal processing unit 4. The acoustic parameters include a low-frequency component enhancement parameter, a pseudo low-frequency extension parameter, a distance correction parameter, a loudness correction parameter, and a distortion parameter, which will be described later.

The input unit 3 has an interface for inputting a digital audio signal such as HDMI (registered trademark) or S / PDIF, and inputs the digital audio signal from the outside. The input unit 3 may have an analog audio signal input interface, and may include a function of an AD converter that converts an analog audio signal into a digital audio signal when the analog audio signal is input.

The digital audio signal input to the input unit 3 is input to the signal processing unit 4. The signal processing unit 4 corresponds to the audio signal processing unit referred to in the present invention. The signal processing unit 4 is a DSP, and performs various signal processing such as equalizer (EQ) processing and loudness correction processing on the digital audio signal input from the input unit 3 in accordance with the acoustic parameters set by the control unit 2 (this Acoustic signal processing) referred to in the invention is performed.

The digital audio signal that has been subjected to signal processing by the signal processing unit 4 is converted into an analog audio signal by a DA converter (not shown), level-adjusted by the level adjustment unit 5, and then input to the amplification unit 6. The level adjustment unit 5 performs level adjustment according to the volume setting value of the master volume 8. The amplifying unit 6 amplifies the analog audio signal. The analog audio signal amplified by the amplification unit 6 is output to the speaker 20 connected via the output unit 7. The master volume 8 corresponds to the volume setting reception unit referred to in the present invention.

The storage unit 9 stores related information that associates the type of the speaker 20, the installation location of the speaker 20, and the acoustic parameters. The type of the speaker 20 may be configured to use any information as long as the size of the speaker, the structure of the speaker 20, and the material of the speaker 20 can be determined. The speaker 20 may be installed at any location as long as it can determine the distance to the listening position and whether the sound can reach the user directly. The related information may be information in any format as long as the acoustic parameter can be determined from the type of the speaker 20 and the installation location of the speaker 20.

The type of the speaker 20 used in this example is a classification of the speaker 20 according to shape and size (book shelf type, tallboy type, inwall type, ceiling type, small portable type, etc.). Also, the installation location of the speaker 20 is indoor, outdoor, in-wall, ceiling, or the like. In this example, the type of the speaker 20 and the installation location of the speaker 20 correspond to the attribute information of the speaker referred to in the present invention.

Note that the speaker attribute information referred to in the present invention may be only one of the type of the speaker 20 or the installation location of the speaker 20, and additionally includes other than the type of the speaker 20 and the installation location of the speaker 20. It may be.

In this example, the size of the speaker 20 is classified into three levels of large, medium, and small, but the number of classifications may be any number. Further, the structure of the speaker 20 is classified according to the presence / absence of a bass reflex port (with a bass reflex port or sealed / full range), but may be classified into two or more according to other structures. In addition, in this example, the material of the speaker 20 is classified into two types, ie, a material with high sound quality or a non-high quality material (material with durability priority), but it is classified into two or more in other items. May be.

The operation unit 10 receives input of the type of the speaker 20 and the installation location of the speaker 20 by the user. The operation unit 10 corresponds to the setting input receiving unit referred to in the present invention.

Further, the control unit 2 determines the acoustic parameters corresponding to the type of the speaker 20 received by the operation unit 10 and the installation location of the speaker 20 based on related information stored in the storage unit 9 and sets the acoustic parameters in the signal processing unit 4. .

Here, acoustic parameters set in the signal processing unit 4 will be described. In this example, the acoustic parameters set in the signal processing unit 4 include a low frequency component enhancement parameter, a pseudo low frequency expansion parameter, a distance correction parameter, a loudness correction parameter, and a distortion parameter.

The low-frequency component enhancement parameter is a parameter that enhances the output level of the component near the lowest frequency f0 that can be output from the speaker 20. The minimum frequency f0 that can be output from the speaker 20 depends on the size and the presence or absence of a bass reflex port. In addition, the output level of the component near the lowest frequency f0 is much weaker than the output level of the component in the other frequency band. The low-frequency component enhancement parameter is a parameter for enhancing the output level of the component near the lowest frequency f0 and improving the sound quality near the lowest frequency f0. The low frequency component enhancement parameter is a parameter related to EQ processing. This low-frequency component enhancement parameter corresponds to the first parameter referred to in the present invention.

The pseudo low frequency expansion parameter is a parameter for artificially generating a low frequency component having a frequency lower than f0 that cannot be output from the speaker 20 by using a missing fundamental or a harmonic. That is, the pseudo low frequency expansion parameter is a parameter that allows the user to perceive a sound of a low frequency component having a frequency lower than f0. This pseudo low frequency expansion parameter corresponds to the second parameter referred to in the present invention.

The distance correction parameter is a parameter for correcting a decrease in the output level of the high frequency component that attenuates according to the distance to the listening position. High frequency components are less likely to travel far than low frequency components. For this reason, when the distance between the speaker 20 and the listening position is increased, the degree of weakening of the high frequency component is larger than that of the low frequency component. The distance correction parameter is a parameter that enhances the output level of the high frequency component and improves the sound quality of the high frequency component. The distance correction parameter is a parameter related to EQ processing.

The loudness correction parameter is a parameter for realizing a frequency characteristic in accordance with, for example, an equal loudness curve defined in ISO 226: 2003. For example, according to the volume setting value of the master volume 8, a frequency component of 100 Hz and a frequency of 10 kHz are used. This parameter increases the frequency component. The loudness correction parameter is a parameter that suppresses difficulty in hearing low-frequency components and high-frequency components at low volumes. In other words, the loudness correction parameter is a parameter that improves the sound quality of the low-frequency component and the high-frequency component at a low volume. This loudness correction parameter corresponds to the third parameter referred to in the present invention.

The distortion parameter is a parameter for preventing the generation of noise caused by mechanical distortion of the speaker or wind noise from the bass reflex port. When the speaker 20 outputs a loud sound or outputs a sound with a low frequency, a noise due to a mechanical distortion of the speaker 20 or a wind noise from the bass reflex port is generated. The distortion parameter is a parameter that suppresses the output of the low frequency band or the entire band by processing such as a limiter or a multiband compressor when the sound volume is higher than a certain level and prevents the generation of abnormal noise. This strain parameter corresponds to the fourth parameter referred to in the present invention.

Here, a process in which the control unit 2 determines an acoustic parameter to be set in the signal processing unit 4 will be described. FIG. 2 is a flowchart illustrating processing (acoustic parameter determination processing) in which the control unit determines an acoustic parameter to be set in the signal processing unit.

The audio signal processing apparatus 1 receives the setting input of the type of the speaker 20 and the installation location of the speaker 20 by the user in the operation unit 10 (s1). In the operation unit 10, the user performs an operation related to setting input of the type of the speaker 20 and the installation location of the speaker 20.

The control unit 2 determines the size of the speaker 20, the structure of the speaker 20, the material of the speaker 20, the distance between the speaker 20 and the listening position based on the type of the speaker 20 set and input by the user and the installation location of the speaker 20. Then, five points of sound transmission at the listening position are determined (s2). The determination relating to s2 is performed using related information stored in the storage unit 9. In other words, the related information stored in the storage unit 9 includes the size of the speaker 20, the structure of the speaker 20, the material of the speaker 20, the speaker 20 and the listening position, from the type of the speaker 20 and the installation location of the speaker 20. This is information that can be used to determine the five points of transmission of sound at the listening position.

FIG. 3 is a diagram showing the determination results of five points based on the setting input. For example, if the setting input received in s1 is a bookshelf type indoor installation, the control unit 2 sets the size of the speaker 20 as shown in FIG. 3 and the structure of the speaker 20 includes a bass reflex port. It is determined that 20 materials are high sound quality materials, the distance to the listening position is close, and the sound is transmitted directly at the listening position.

Further, when the setting input received in s1 is a Tallboy type indoor installation, the control unit 2 increases the size of the speaker 20 and the structure of the speaker 20 with a bass reflex port, as shown in FIG. It is determined that the 20 materials are high sound quality materials, the distance to the listening position is long, and the sound is transmitted directly at the listening position.

Further, when the setting input received in s1 is a wall-embedded type (in-wall), the control unit 2 increases the size of the speaker 20 and the structure of the speaker 20 with a bass reflex port, as shown in FIG. It is determined that the material of the speaker 20 is a non-high-quality sound material (material with durability priority), the distance to the listening position is long, and the transmission of sound at the listening position is behind the furniture (the sound does not reach directly).

Further, when the setting input received in s1 is a ceiling-embedded type (ceiling), the control unit 2 reduces the size of the speaker 20 and the structure of the speaker 20 as a sealed type / full range, as shown in FIG. It is determined that the material of the speaker 20 is a non-high quality material, the distance to the listening position is short, and the sound is transmitted directly at the listening position.

Further, when the setting input received in s1 is a small store broadcasting type (ceiling), the control unit 2 reduces the size of the speaker 20 and the structure of the speaker 20 as a sealed type / full range as shown in FIG. Therefore, it is determined that the material of the speaker 20 is a non-high-quality sound material, the distance to the listening position is long, and the sound transmission at the listening position is an indirect sound.

In addition, when the setting input received in s1 is an outdoor installation type, the control unit 2 sets the size of the speaker 20 to the middle, the structure of the speaker 20 to the sealed type / full range, The material is a non-high quality material, the distance to the listening position is far away, and the sound transmission at the listening position is judged to diverge.

Further, when the setting input received in s1 is a small portable type, the control unit 2 reduces the size of the speaker 20 and the structure of the speaker 20 as a sealed type / full range, as shown in FIG. It is determined that the material is a non-high quality material, the distance to the listening position is short, and the sound transmission at the listening position is unknown.

The control unit 2 determines a low-frequency component enhancement parameter according to the size of the speaker 20 (in this example, three levels of large, medium, and small) and the structure of the speaker 20 (whether there is a bass reflex port) (s3). . The related information stored in the storage unit 9 includes information for determining a low-frequency component enhancement parameter for the speaker 20 from the size of the speaker 20 and the structure of the speaker 20. The control unit 2 determines the lowest frequency f0 that can be output from the speaker 20 according to the size of the speaker 20 and the structure of the speaker 20. In addition, if the size of the speaker 20 is medium or small, the control unit 2 determines the low frequency component enhancement parameter with the degree of enhancement of the minimum frequency f0 being increased (for example, enhancement of about 6 dB). In addition, if the size of the speaker 20 is large, the control unit 2 determines the low-frequency component enhancement parameter that weakens (for example, enhances by about 3 dB) the degree of enhancing the minimum frequency f0.

Also, the control unit 2 determines the pseudo low-frequency expansion parameter according to the size of the speaker 20, the structure of the speaker 20 (whether there is a bass reflex port), and the material of the speaker 20 (s4). The related information stored in the storage unit 9 includes information for determining a pseudo low-frequency expansion parameter for the speaker 20 based on the size of the speaker 20, the structure of the speaker 20 (presence of bass reflex port), and the speaker 20 material. include.

Further, the control unit 2 determines distance correction parameters according to the five points determined in s2 (s5). The related information stored in the storage unit 9 includes a distance correction parameter for the speaker 20 based on the size of the speaker 20, the structure of the speaker 20 (with or without bass reflex port), the speaker 20 material, and the distance between the speaker 20 and the listening position. Contains information to determine.

Further, the control unit 2 determines a loudness correction parameter corresponding to the five points determined in s2 (s6). The related information stored in the storage unit 9 includes information for obtaining a loudness correction parameter for the speaker 20 from the distance between the speaker 20 and the listening position. The loudness correction parameter is a parameter in which values for increasing the frequency component of 100 Hz and the frequency component of 10 kHz are set for each set value of the master volume 8.

Further, the control unit 2 determines strain parameters corresponding to the five points determined in s2 (s7). The related information stored in the storage unit 9 includes the size of the speaker 20, the structure of the speaker 20 (with or without bass reflex port), the speaker 20 material, the distance between the speaker 20 and the listening position, and the transmission of sound at the listening position. Information for determining a distortion parameter for the speaker 20 is included.

FIG. 4 is a diagram showing the action of each parameter (low frequency component enhancement parameter, pseudo low frequency expansion parameter, distance correction parameter, loudness correction parameter, and distortion parameter) on the audio signal.

For the bookshelf type speaker 20 installed indoors, the control unit 2 determines the low-frequency component enhancement parameter as a parameter in which the low-frequency component enhancement is strengthened (for example, enhances about 6 dB), and performs pseudo low-frequency expansion. The parameter for generating the parameter in a pseudo manner (the frequency of the pseudo low frequency expansion) is determined to be a high parameter (for example, 80 Hz), and the loudness correction parameter is determined to be a parameter that operates only at a low volume. Further, the control unit 2 does not need the distance correction parameter and the distortion parameter.

In addition, for the Tallboy speaker 20 installed indoors, the control unit 2 determines the low-frequency component enhancement parameter as a parameter in which the low-frequency component enhancement parameter is weakened (for example, increases by about 3 dB), and the loudness correction. The parameter is determined to be a parameter that operates only at a low volume. Further, the control unit 2 does not need the pseudo low frequency band extension parameter, the distance correction parameter, and the distortion parameter.

In addition, for the wall-embedded speaker 20 that is installed indoors, the control unit 2 determines the low-frequency component enhancement parameter as a parameter in which the low-frequency component enhancement is weak, and generates a pseudo low-frequency extension parameter in a pseudo manner. The frequency is determined to be a low parameter (for example, 60 Hz), the distance correction parameter is determined to be a parameter that emphasizes the high frequency (for example, the high frequency is increased by about 3 dB), and the loudness correction parameter is a volume far from the viewing position. Since the position is likely to be raised higher, it is determined as a parameter that operates from the middle volume level. Further, the control unit 2 does not require a strain parameter.

In addition, for the ceiling-embedded speaker 20 installed indoors, the control unit 2 determines the low-frequency component enhancement parameter as a parameter in which the low-frequency component enhancement is strong, and generates a pseudo low-frequency extension parameter in a pseudo manner. The parameter having a higher frequency is determined, the distance correction parameter is determined to be unnecessary because the distance is close, and the loudness correction parameter is determined to be a parameter that operates only at a low volume. Further, the control unit 2 does not require a strain parameter.

Further, the control unit 2 determines the low-frequency component enhancement parameter to be a parameter in which the low-frequency component enhancement is strong for the small store broadcast type speaker 20 sealed on the ceiling, and artificially sets the pseudo low-frequency extension parameter. The parameter to be generated is determined to be higher, the distance correction parameter is determined to be a parameter that emphasizes the high range, and the loudness correction parameter is likely to be raised higher from the viewing position because the ceiling is high. Therefore, it is determined as a parameter that operates from the middle volume level, and the distortion parameter is determined as a parameter to be limited in the entire band.

Further, for the outdoor type speaker 20, the control unit 2 determines the low-frequency component enhancement parameter as a parameter in which the low-frequency component enhancement is strong, and the frequency at which the pseudo low-frequency extension parameter is generated in a pseudo manner is high. Since the distance correction parameter is determined to be a parameter that emphasizes the high range, and the loudness correction parameter is open space and far from the viewing position, the volume position is likely to be raised higher. The operating parameter is determined, and the distortion parameter is determined as a parameter to be limited in the entire band.

Further, for the small portable speaker 20, the control unit 2 determines the low-frequency component enhancement parameter to be a parameter for which the low-frequency component enhancement is weak, and the frequency at which the pseudo low-frequency expansion parameter is generated in a pseudo manner is low. A certain parameter is determined, the distance correction parameter is determined as a parameter that emphasizes the high range, and the loudness correction parameter is low in efficiency for a small speaker, and the output may be reduced even with a large input signal, so the volume position may be increased. Therefore, it is determined as a parameter that operates from the middle volume level, and a distortion parameter is determined as a parameter that applies a limiter to a low frequency range.

The operation from the middle volume level of the loudness correction parameter means that the loudness correction is performed when the volume setting value of the master volume 8 is equal to or lower than the middle volume A, and the operation from the low volume level is the master volume 8. Means that the loudness correction is performed when the volume setting value is equal to or smaller than the low volume B (B <A).

The control unit 2 sets the low frequency component enhancement parameter, pseudo low frequency expansion parameter, distance correction parameter, loudness correction parameter, and distortion parameter determined in s3 to s7 in the signal processing unit 4 as acoustic parameters. The signal processing unit 4 performs acoustic signal processing on the audio signal input via the input unit 3 in accordance with the acoustic parameters set by the control unit 2.

The signal processing unit 4 performs the loudness correction based on the loudness correction parameter according to the set value of the master volume 8 input from the control unit 2.

As described above, in the audio signal processing device 1 according to this example, the acoustic parameter setting corresponding to the type of the speaker 20 and the installation location of the speaker 20 sets and inputs the type of the speaker 20 and the installation location of the speaker 20. It can be done with a simple operation.

Especially, since the acoustic parameters include the low-frequency component enhancement parameter, the sound quality near the lowest frequency f0 that can be output by the speaker 20 can be improved.

Also, since the acoustic parameters include a pseudo low frequency extension parameter, it is possible to make the user perceive a low frequency component sound having a frequency lower than f0. Further, since the acoustic parameter includes the distance correction parameter, it is possible to suppress the deterioration of the sound quality of the high frequency component even when the listening position is away from the installation location of the speaker 20. In addition, since the acoustic parameters include the loudness correction parameter, it is possible to suppress the low frequency component and the high frequency component from becoming difficult to hear even at a low volume. Further, since the acoustic parameters include a distortion parameter, when outputting a loud sound or outputting a sound with a low frequency, a sound caused by mechanical distortion of the speaker 20 or a wind noise from the bass reflex port. It is possible to prevent the occurrence of abnormal noise such as.

Note that the processing relating to s3 to s7 is not limited to the order shown in FIG. 2, and may be performed in any order. Further, the audio signal processing apparatus 1 may be configured such that at least one of the pseudo low frequency band expansion parameter, the distance correction parameter, the loudness correction parameter, and the distortion parameter determined in s4 to s7 is not included in the acoustic parameter. Furthermore, the audio signal processing apparatus 1 may be configured to include other types of parameters in the acoustic parameters, such as a specific band expansion parameter that artificially creates a frequency component that is missing due to the characteristics of the speaker 20 using harmonics. .

FIG. 5 is a block diagram showing a configuration of a main part of an audio signal processing device according to another example. The audio signal processing apparatus 1a according to this example is connected to a plurality of terminals 30 (30a to 30e). Although FIG. 5 shows five terminals 30a to 30e connected to the audio signal processing device 1a, the number of terminals 30 may be any number.

The audio signal processing apparatus 1a of this example includes a control unit 2a, an input unit 3a, five signal processing units 4a to 4e, five level adjustment units 5a to 5e, a master volume 8a, a storage unit 9a, An operation unit 10a and a transmission unit 11 are provided. In this example, the signal processing unit 4a and the level adjustment unit 5a correspond to the terminal 30a, the signal processing unit 4b and the level adjustment unit 5b correspond to the terminal 30b, and the signal processing unit 4c and the level adjustment unit 5c correspond to the terminal. 30c, the signal processing unit 4d and the level adjustment unit 5d correspond to the terminal 30d, and the signal processing unit 4e and the level adjustment unit 5e correspond to the terminal 30e.

The input unit 3a has the same configuration as the input unit 3 in the above example, but inputs the input digital audio signal to each of the signal processing units 4a to 4e.

The signal processing units 4a to 4e have the same configuration as the signal processing unit 4 in the above example, and according to the set acoustic parameters, the signal processing unit 4a performs signal processing on the digital audio signal input from the input unit 3a (in this invention, Acoustic signal processing). The control unit 2 determines and sets acoustic parameters for each of the signal processing units 4a to 4e.

Note that the signal processing units 4a to 4e may be configured with one DSP or a plurality of DSPs.

The level adjusters 5a to 5e have the same configuration as the level adjuster 5 in the above example, and adjust the level of the analog audio signals input from the corresponding signal processors 4a to 4e.

The master volume 8a, the storage unit 9a, and the operation unit 10a have the same configuration as the master volume 8, the storage unit 9, and the operation unit 10 in the above example.

The transmitting unit 11 transmits the audio signals whose levels have been adjusted by the level adjusting units 5a to 5e to the terminals 30a to 30e. The transmission unit 11 transmits the audio signal level-adjusted by the level adjustment unit 5a to the terminal 30a, transmits the audio signal level-adjusted by the level adjustment unit 5b to the terminal 30b, and is level-adjusted by the level adjustment unit 5c. The audio signal is transmitted to the terminal 30c, the audio signal whose level is adjusted by the level adjusting unit 5d is transmitted to the terminal 30d, and the audio signal whose level is adjusted by the level adjusting unit 5e is transmitted to the terminal 30e.

The transmission unit 11 may be configured to perform communication with the terminals 30a to 30e in a wired manner or may be configured to be performed wirelessly. Further, the transmission unit 11 may be configured to transmit analog audio signals to the terminals 30a to 30e, or may be configured to transmit digital audio signals to the terminals 30a to 30e. When the transmission unit 11 transmits digital audio signals to the terminals 30a to 30e, an AD converter that converts the analog audio signals output from the level adjustment units 5a to 5e into digital audio signals may be provided.

Also, as shown in FIG. 5, speakers 20a to 20e are connected to the terminals 30a to 30e. The speakers 20a to 20e may be installed separately in a living room, a kitchen space, a bedroom, a study, a bathroom, or the like, or may be installed in the same indoor space.

FIG. 6 is a block diagram showing the configuration of the main part of the terminal. Each of the terminals 30a to 30e has the same configuration. Here, the terminal 30a will be described as an example. The terminal 30a includes a receiving unit 31, an amplifying unit 32, and an output unit 33. The receiving unit 31 receives the audio signal transmitted from the transmitting unit 11 of the audio signal processing device 1a. The receiving unit 31 outputs an analog audio signal. When the audio signal transmitted from the transmission unit 11 of the audio signal processing device 1a is a digital audio signal, an AD converter that converts the received digital audio signal into an analog audio signal may be provided in the reception unit 31. .

The amplifying unit 32 has the same configuration as that of the amplifying unit 6 in the above example, and amplifies the analog audio signal output from the receiving unit 31. The analog audio signal amplified by the amplification unit 32 is output to the speaker 20 a connected via the output unit 33.

When the operation unit 10a accepts the type of the speaker 20a connected to the terminal 30a and the setting input of the speaker 20a in the operation unit 10a, the control unit 2a performs the acoustic parameter determination process illustrated in FIG. Set in the processing unit 4a. Similarly, for the terminals 30b to 30e, the control unit 2a receives, for each of the terminals 30b to 30e, the type of the speakers 20b to 20e connected to the terminals 30b to 30e and the setting input of the speaker 20b in the operation unit 10a. Then, the acoustic parameter determination process shown in FIG. 2 is performed, and the determined acoustic parameters are set in the corresponding signal processing units 4b to 4e.

Therefore, for each of the speakers 20a to 20e connected to the terminals 30a to 30e, the acoustic parameters can be easily set according to the type of the speakers 20a to 20e and the installation location.

The audio signal processing device 1a transmits an audio signal to the terminals 30a to 30e that are requested to transmit the audio signal, and transmits an audio signal to the terminals 30a to 30e that are not requested to transmit the audio signal. do not do.

FIG. 7 is a block diagram showing the configuration of the main part of an audio signal processing apparatus according to another example. In this example, a part of the functions of the audio signal processing apparatus 1 of the example shown in FIG. 1 is provided in the control terminal 40 of the audio signal processing apparatus 1f. The control terminal 40 includes a control unit 41, a storage unit 42, an operation unit 43, and a transmission unit 44. The control terminal 40 may be a smartphone or a dedicated terminal.

The control unit 41 controls the operation of the main body of the control terminal 40 and executes the acoustic parameter determination process shown in FIG. The storage unit 42 stores related information that associates the type of the speaker 20f, the installation location of the speaker 20f, and the acoustic parameters described in the above example. The operation unit 43 receives input of the type of the speaker 20f and the installation location of the speaker 20f by the user. The transmission unit 44 performs the acoustic parameter determination process shown in FIG. 2 by the control unit 41, and transmits the determined acoustic parameter to the audio signal processing device 1f.

The audio signal processing device 1f includes a control unit 2f, an input unit 3f, a signal processing unit 4f, a level adjustment unit 5f, an amplification unit 6f, an output unit 7f, a master volume 8f, and a reception unit 12. The audio signal processing device 1 f has substantially the same configuration as the audio signal processing device 1 shown in FIG. 1, but does not include the storage unit 9 and the operation unit 10. Further, the control unit 2f does not execute the acoustic parameter determination process shown in FIG. 2 (as described above, the control unit 41 of the control terminal 40 executes the acoustic parameter determination process shown in FIG. 2).

The input unit 3f, the signal processing unit 4f, the level adjustment unit 5f, the amplification unit 6f, the output unit 7f, and the master volume 8f are the input unit 3, the signal processing unit 4, and the level adjustment of the audio signal processing device 1 shown in FIG. The configuration is the same as that of the unit 5, the amplification unit 6, the output unit 7, and the master volume 8. The receiving unit 12 receives the acoustic parameter transmitted from the control terminal 40.

In this example, the user performs an operation of inputting the type of the speaker 20f and the installation location of the speaker 20f on the operation unit 43 of the control terminal 40. In the control terminal 40, the control unit 41 executes the acoustic parameter determination process shown in FIG. In the transmission unit 44, the control terminal 40 transmits the determined acoustic parameter to the audio signal processing device 1f.

Further, when the audio signal processing device 1 f receives the acoustic parameter transmitted from the control terminal 40 at the receiving unit 12, the audio signal processing device 1 f sets the received acoustic parameter in the signal processing unit 4 f. The signal processing unit 4f performs signal processing on the digital audio signal input from the input unit 3a according to the set acoustic parameter.

Thus, the audio signal processing device 1f of this example performs signal processing on the input digital audio signal in accordance with the acoustic parameters determined by the control terminal 40, and thus is the same as the audio signal processing device 1 of the above example. There is an effect.

In addition, the control terminal 40 includes an input unit 3f, a signal processing unit 4f, a level adjustment unit 5f, and a master volume 8b, performs signal processing on the input digital audio signal according to the determined acoustic parameters, and performs signal processing. The applied audio signal may be transmitted from the transmission unit 44 to the terminal 30a shown in FIG.

Note that the audio signal processing apparatus 1 according to this example can be applied to various devices such as an AV amplifier, an AV receiver, a personal computer, and the like that perform acoustic signal processing on an input audio signal according to a set acoustic parameter.

DESCRIPTION OF SYMBOLS 1, 1a ... Audio

signal processing apparatus

2, 2a ...

Control part

3, 3a ...

Input part

4, 4a-4e ...

Signal processing part

5, 5a-5e ... Level adjustment part 6, 6a-6e ... Amplification part 7, 7a- 7e ...

output unit

8, 8a ...

master volume

9, 9a ...

storage unit

10, 10a ... operation unit 11 ...

transmission unit

20, 20a-20e ... speaker 30 (30a-30e) ... terminal

Claims

An audio signal processing unit that performs acoustic signal processing on the input audio signal in accordance with the set acoustic parameters;
A storage unit for storing related information associating speaker attribute information and the acoustic parameters;
A setting input receiving unit that receives the attribute information of the speaker as a setting input;
A controller that determines the acoustic parameters to be set in the audio signal processing unit according to related information stored in the storage unit and the setting input received by the setting input receiving unit;
The audio signal processing apparatus, wherein the acoustic parameter determined by the control unit includes a first parameter for enhancing a low frequency component.
The attribute information of the speaker includes the type of the speaker,
The audio signal processing apparatus according to claim 1, wherein the first parameter is a parameter that enhances a lowest frequency component that can be output by the speaker.
3. The audio signal processing device according to claim 2, wherein the acoustic parameter determined by the control unit includes a second parameter that artificially generates a component less than the lowest frequency that can be output by the speaker.
The attribute information of the speaker includes the type of the speaker and the installation location of the speaker.
The audio signal processing apparatus according to any one of claims 1 to 3, wherein the storage unit stores related information that associates the type of the speaker, the installation location of the speaker, and the acoustic parameter.
A volume setting reception unit for receiving volume setting values is provided.
The acoustic parameter determined by the control unit includes a third parameter for setting a level increase amount at the time of loudness correction according to the volume setting value received by the volume setting receiving unit. 5. The audio signal processing device according to any one of 4 above.
6. The audio signal processing according to claim 1, wherein the acoustic parameter determined by the control unit includes a fourth parameter that suppresses a level of a frequency component whose output level exceeds a threshold level. apparatus.
The audio signal processing unit includes a transmission unit that transmits the audio signal subjected to the acoustic signal processing to a plurality of terminals,
The setting input receiving unit receives the setting input for each terminal,
The control unit determines the acoustic parameter for each terminal,
The audio signal processing unit according to any one of claims 1 to 6, wherein the audio signal processing unit performs the acoustic signal processing on the input audio signal for each of the terminals according to the acoustic parameters set for the terminal. Audio signal processing device.
An acoustic parameter determination method for determining the acoustic parameter to be set in an audio signal processing unit that performs acoustic signal processing on an input audio signal according to a set acoustic parameter,
The setting input accepting unit accepts speaker attribute information as a setting input,
The control unit is configured to receive the acoustic parameter to be set in the audio signal processing unit, related information that associates the attribute information of the speaker and the acoustic parameter stored in a storage unit, and the setting input reception unit that has received the information. Determine according to the setting input,
The acoustic parameter determination method, wherein the acoustic parameter determined by the control unit includes a first parameter that enhances a low frequency component.