JP2005309212A - Sound field correcting device, method for controlling sound field correcting device, control program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a listener himself or herself to correct his or her hearing according to hearing characteristics of the listener or listener's taste. <P>SOLUTION: An operation part 12 is operated by the listener to perform hearing correcting adjustment on the basis of a reference sound for hearing correction reproduced through headphones 8 so that the reference sound for hearing correction matches hearing characteristics that the listener desires, microphones 10 and 11 measure the reference sound for hearing correction reproduced through a speaker 9 at a position where the listener is expected to listen, and a controller 5 corrects the sound field by controlling a DSP 4 so that hearing characteristics of the reference sound for hearing correction measured by the microphones 10 and 11 match the desired hearing characteristics. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a sound field correction apparatus, a control method for the sound field correction apparatus, a control program, and a recording medium, and more particularly, to a sound field correction apparatus and a sound field correction apparatus for correcting a sound field in a room or a vehicle interior. The present invention relates to a control method, a control program, and a recording medium.

FIG. 6 is an explanatory diagram of an equal loudness curve.
The frequency characteristics of human hearing have been analyzed in detail, and Fletcher Manson's isosensitivity curve (equal loudness curve) as shown in FIG. 6 is well known.
The horizontal axis of the equal loudness curve is the frequency, and the vertical axis is the sound pressure level. The curve on the graph is a line connecting points that can be heard with the same volume of sound.
Specifically, taking the 80 (phon) curve as an example, the sound pressure level at 1 kHz is about 80 dB, and the sound pressure level in the vicinity of 20 Hz of this curve is 118 dB.

This indicates that the sound of 80 dB at 1 kHz and the sound of 118 dB at 20 Hz sound the same for humans.
In this way, human hearing is heard with different sound pressures depending on the frequency, and sound field correction is conventionally performed based on this human auditory characteristic (for example, Patent Document 1). reference)
Utility Kaihei 5-41217

FIG. 7 is a diagram showing the average value of the ratio of the sound pressure on the eardrum to the sound pressure at the ear canal entrance (= the sound pressure on the eardrum / the sound pressure at the ear canal entrance) and its standard deviation.
According to FIG. 7, it can be understood that there is a large difference between the average value and the actual measurement value depending on the frequency.
In addition, depending on the body shape of the actual listener (listener), the listening conditions are further different, and it is difficult to make settings common to all listeners.
That is, the audibility correction tailored to each listener cannot be performed only by the correction based on the equal loudness curve shown in FIG. 6, and there is a problem that the audibility correction cannot be performed reliably.

In order to solve this problem, it is conceivable that each listener corrects auditory perception, but specialized knowledge and skills are required, and it has not been easy for general listeners to do.
SUMMARY OF THE INVENTION An object of the present invention is to provide a sound field correction apparatus, a control method for the sound field correction apparatus, a control program, and a recording medium that can be easily corrected by the listener according to the listener's audibility characteristics or listener's preference. Is to provide.

In order to solve the above-mentioned problem, the listener performs auditory correction adjustment so that the auditory correction reference sound becomes a listener's desired auditory characteristic based on the auditory correction reference sound reproduced through the headphones. An operation unit, a microphone that measures the audible correction reference sound reproduced via a speaker at the listener's scheduled listening position, and the audibility characteristics of the audible correction reference sound measured by the microphone are the desired values. And a sound field correction unit that performs correction so as to obtain audibility characteristics.
According to the above configuration, in the operation unit, the listener corrects the audibility so that the audibility correction reference sound has a desired audibility characteristic of the listener based on the audibility correction reference sound reproduced through the headphones. Make adjustments.
Thereafter, the auditory correction reference sound reproduced by the microphone through the speaker is measured at the listener's scheduled listening position, and the sound field correction unit has the desired auditory characteristic of the auditory correction reference sound measured by the microphone. Make corrections so that

In this case, an adjustment state storage unit that stores the state of the hearing correction adjustment may be provided.
The sound field correction unit may include a DSP and perform the correction by changing the setting of the DSP coefficient.
Furthermore, the audibility correction adjustment may include at least one of listener sound pressure level adjustment, frequency band-based listening sound pressure level adjustment, and listener preference adjustment.
Furthermore, the listener's sound pressure level adjustment may be performed so that the listener feels that the sound pressure levels of the plurality of audible correction reference sounds having different sound pressure levels are equal.

The listening sound pressure level adjustment for each frequency band may be adjusted so that the listener feels that the frequency characteristics of the correction reference sound are substantially flat.
Further, the listener preference adjustment may be performed so that the listener can adjust the frequency characteristics of the correction reference sound in accordance with the preference.
Furthermore, the microphone may be provided integrally with the headphone.

  In addition, a control method for controlling a sound field correction apparatus having an operation unit to which headphones, a speaker, and a microphone are connected is based on the audibility correction reference sound reproduced through the headphones. An operation process in which the listener performs audibility correction adjustment through the operation unit so that the sound has desired audibility characteristics of the listener, and the audibility correction reference sound reproduced through the speaker is A measurement process for measuring by the microphone at a listener's scheduled listening position, a sound field correction process for correcting the audibility characteristic of the audibility correction reference sound measured by the microphone to be the desired audibility characteristic, It is characterized by having.

  In addition, a control program for controlling a sound field correction apparatus having an operation unit to which a headphone, a speaker, and a microphone are connected is based on the auditory correction reference sound reproduced through the headphones. The audibility correction reference sound reproduced through the speaker is urged to perform the audibility correction adjustment via the operation unit so that the reference sound for the listener has a desired audibility characteristic. It is characterized in that it is measured by the microphone at the listener's scheduled listening position, and correction is performed so that the audibility characteristic of the audibility correction reference sound measured by the microphone becomes the desired audibility characteristic.

In this case, the audibility correction adjustment state may be stored.
The sound field correction apparatus may include a DSP, and the correction may be performed by changing the setting of the DSP coefficient.
Furthermore, the audibility correction adjustment may include at least one of listener sound pressure level adjustment, frequency band-based listening sound pressure level adjustment, and listener preference adjustment.
Furthermore, the listener's sound pressure level adjustment is urged to make adjustments so that the listener feels that the sound pressure levels of the plurality of audibility correction reference sounds having different sound pressure levels are equal. Also good.

The listening sound pressure level adjustment for each frequency band may be urged so that the listener can make an adjustment so that the frequency characteristic of the reference sound for correction is felt to be substantially flat.
Furthermore, the listener preference adjustment may be urged to cause the listener to make an adjustment so that the frequency characteristic of the correction reference sound is in line with the preference.
The control programs may be recorded on a computer-readable recording medium.

  According to the present invention, even a general listener who does not have specialized knowledge or technology can easily perform auditory sensation correction suitable for himself / herself.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a schematic configuration of a sound field correction system according to an embodiment.
The sound field correction system 1 reproduces a medium (recording medium) in which audible correction sound source data is stored and outputs audio data for audibility correction, and various data in advance or temporarily. , A digital signal processing unit (DSP) 4 that performs various signal processing, a controller 5 that controls the entire sound field correction system 1, a headphone amplifier 6, and a power amplifier that amplifies the audio signal for audibility correction 7, auditory correction headphones 8 for performing auditory correction while the listener is wearing, a speaker 9 for outputting auditory correction sound based on the amplified auditory correction audio signal, and operations for performing various operations Part 12 is provided.

The controller 5 is configured as a so-called computer, and includes a ROM (not shown) that stores a control program for controlling the sound field correction system 1 in advance, a RAM (not shown) that temporarily stores various data, and a control in the ROM. A CPU (not shown) that performs control based on the program.
The audibility correction headphones 8 have a first measurement microphone (for R channel) 10 to which the audibility correction sound output from the speaker 9 is input and a second audibility correction sound output from the speaker 9. A measurement microphone (for L channel) 11 is provided.

FIG. 2 is a process flowchart of the auditory sense correction process.
First, when an audibility correction process is instructed via the operation unit 12, the controller 5 determines whether or not the medium M storing the audibility correction sound source data is inserted into the media playback device 2 (step S1). .
If it is determined in step S1 that the medium M is inserted, the controller 5 causes the media playback device 2 to play back the media M and output audio data for audibility correction, and the process proceeds to step S3.
If it is determined in step S1 that the medium M is not inserted, the controller 5 reads (loads) the audio data for audibility correction stored in the memory 3, and the process proceeds to step S3 (step S3). S8).
Next, the controller 5 performs an auditory correction adjustment process (step S3).

FIG. 3 is a process flowchart of the auditory sense correction adjustment process. FIG. 4 is a common process flowchart of each adjustment process in the auditory sense correction adjustment process.
First, the controller 5 performs a listener sound pressure level adjustment process when proceeding to the auditory correction adjustment process (step S11).
In the listener sound pressure level adjustment processing, the controller 5 adjusts the sound pressure level of the listeners with two different sound pressure levels via the headphone amplifier 6 and the hearing correction headphones 8 to the DSP 4 based on the sound correction sound data. A reference sound (= audible correction reference sound) is output and reproduced (step S21).

The listener can hear the listener's sound pressure level adjustment reference sound corresponding to the R channel to the right ear through the headphone amplifier 6 and the audibility correcting headphones 8. Similarly, the listener can hear the reference sound for adjusting the listener sound pressure level corresponding to the L channel to the left ear through the headphone amplifier 6 and the hearing correction headphones 8.
As a result, the listener turns a volume knob (not shown) of the operation unit 12 to adjust to a position where the sound pressure levels of the L channel and the R channel are felt to be the same (step S22).
As described above, since the reference sound for adjusting the listener's sound pressure level has two types of sound pressure levels, the adjustment is performed twice for each sound pressure level.
Subsequently, the controller 5 determines whether or not a confirmation instruction indicating that the listener adjustment processing has been completed is input via the operation unit 12 (step S23).

If it is determined in step S23 that the listener has not input a confirmation instruction indicating that the adjustment process has been completed (step S23; No), that is, if the listener has input a readjustment confirmation instruction, the process is performed again. The process proceeds to S21, and the same processing is performed thereafter.
If it is determined in step S23 that the listener has input a confirmation instruction that the adjustment process has been completed (step S23; Yes), the controller 5 records the adjustment content in the memory 3 and adjusts the listener's sound pressure level. The process ends, and the process proceeds to step S12.
As a result, a difference in listener's auditory sensitivity according to the sound pressure level is detected. In the above description, there are two types of sound pressure levels. However, it is possible to further adjust three or more types.
Subsequently, the controller 5 performs a listening sound pressure level adjustment process for each frequency band (step S12).

In the process of adjusting the listening sound pressure level for each frequency band, the controller 5 sends the DSP 4 a reference for adjusting the listening sound pressure level for each of a plurality of frequency bands via the headphone amplifier 6 and the hearing correction headphones 8 based on the audio data for listening correction. A sound (= reference sound for audibility correction) is output and reproduced (step S21).
The listener can hear the reference sound for adjusting the listening sound pressure level for each of a plurality of frequency bands corresponding to the R channel to the right ear via the headphone amplifier 6 and the audibility correcting headphones 8. Similarly, the listener can hear the reference sound for adjusting the listening sound pressure level for each of a plurality of frequency bands corresponding to the L channel to the left ear through the headphone amplifier 6 and the audibility correcting headphones 8.
As a result, the listener turns a volume knob (not shown) of the operation unit 12 to adjust to a position where the frequency characteristic is felt to be flat in the entire frequency band (step S22).

Subsequently, the controller 5 determines whether or not a confirmation instruction indicating that the listener adjustment processing has been completed is input via the operation unit 12 (step S23).
If it is determined in step S23 that the listener has not input a confirmation instruction indicating that the adjustment process has been completed (step S23; No), that is, if the listener has input a readjustment confirmation instruction, the process is performed again. The process proceeds to S21, and the same processing is performed thereafter.
In step S23, when the listener inputs a confirmation instruction to the effect that the adjustment process has been completed (step S23; Yes), the controller 5 records the adjustment contents in the memory 3 and listens to the sound pressure for each frequency band. The level adjustment process is terminated, and the process proceeds to step S13.
As a result, a state where the listener feels that the frequency characteristic is flat is detected.

Subsequently, the controller 5 performs listener preference adjustment processing (step S13).
In the listener preference adjustment process, the controller 5 outputs a listener preference adjustment reference sound (= audience correction reference sound) to the DSP 4 via the headphone amplifier 6 and the audibility correction headphones 8 based on the audibility correction sound data. To reproduce (step S21).
The listener can hear the reference sound for adjusting the listener preference corresponding to the R channel to the right ear through the headphone amplifier 6 and the audibility correcting headphones 8. Similarly, the listener can hear the reference sound for adjusting the listener preference corresponding to the L channel to the left ear through the headphone amplifier 6 and the hearing correction headphones 8.

As a result, the listener turns a volume knob (not shown) of the operation unit 12 to adjust the reproduced sound to a position where the reproduced sound feels like the listener's favorite frequency characteristic, similarly to the so-called graphic equalizer adjustment (step S22).
Subsequently, the controller 5 determines whether or not a confirmation instruction indicating that the listener adjustment processing has been completed is input via the operation unit 12 (step S23).

If it is determined in step S23 that the listener has not input a confirmation instruction indicating that the adjustment process has been completed (step S23; No), that is, if the listener has input a readjustment confirmation instruction, the process is performed again. The process proceeds to S21, and the same processing is performed thereafter.
If it is determined in step S23 that the listener has input a confirmation instruction to the effect that the adjustment process has been completed (step S23; Yes), the controller 5 records the adjustment contents in the memory 3 and performs the listener preference adjustment process. The process ends, and the process proceeds to step S4.
As a result, the frequency characteristic preferred by the listener is detected.

FIG. 5 is a process flowchart of the auditory sense correction calculation process.
First, the controller 5 checks the number of audible corrections (step S31).
If it is determined in step S31 that the number of audible corrections is the second or later, the process proceeds to step S33.
In step S31, when the audibility correction count is the first time, the controller 5 uses the sound field measurement sound source data from among the audibility correction sound source data to control the DSP 4 to control the sound field measurement reference. The sound (which constitutes an auditory correction sound) is output via the power amplifier 7 and the speaker 9, and the controller 5 outputs the sound field auditory correction sound output from the speaker 9 to the first measurement microphone 10 and the second measurement microphone. Measurement is performed with the microphone 11 to measure the reference characteristics (step S32).

Next, the controller 5 calculates correction data as a whole in consideration of all the adjustment content data recorded in the memory 3 in the auditory correction adjustment process (steps S11 to S13) (step S33).
Next, the controller 5 calculates a DSP coefficient based on the calculated correction data (step S5).
As a result, the DSP 4 reads the audibility correction check data from the medium M, and reproduces the audibility correction check sound via the headphone amplifier 6 and the audibility correction headphones 8 based on the DSP coefficient calculated in step S5. Output (step S6).

Subsequently, the controller 5 determines whether or not a confirmation instruction indicating that the listener check has been completed is input via the operation unit 12 (step S7).
If it is determined in step S7 that the listener has not input a confirmation instruction indicating that the check has been completed (step S7; No), that is, if the listener has input a confirmation instruction for readjustment, the process is performed again in step S3. The same processing is performed thereafter.
If it is determined in step S7 that the listener has input a confirmation instruction indicating that the adjustment process has ended (step S7; Yes), the controller 5 ends the process.

  As described above, according to this embodiment, even a general listener without specialized knowledge or technology can easily perform auditory correction according to the listener's auditory characteristics or listener's preference. Is possible.

  In the above description, the case where the control program for controlling the sound field correction apparatus 1 is stored in advance in the ROM constituting the controller 5 has been described. However, the recording program such as various magnetic disks, optical disks, and memory cards is used. It is also possible to record the control program in advance, read it from these recording media, and install it. It is also possible to provide a communication interface and download the control program via a network such as the Internet or LAN, and install and execute the program. By configuring in this way, it is possible to configure a sound field correction device that has higher functionality in terms of software and is more user-friendly.

1 is a schematic configuration block diagram of a sound field correction system of an embodiment. It is a process flowchart of an auditory sense correction process. It is a process flowchart of an auditory sense correction adjustment process. It is a common process flowchart of each adjustment process in an auditory sense correction adjustment process. It is a process flowchart of a hearing correction calculation process. It is explanatory drawing of an equal loudness curve. It is a figure which shows the average value of the ratio of the sound pressure on an eardrum, and the sound pressure of an ear canal entrance, and its standard deviation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sound field correction system, 2 ... Media reproduction apparatus, 3 ... Memory, 4 ... Digital signal processing part (DSP; Sound field correction part), 5 ... Controller (sound field correction part), 6 ... Headphone amplifier, 7 ... Power Amplifier, 8 ... Hearing correction headphones, 9 ... Speaker, 10 ... First measurement microphone (for R channel), 11 ... Second measurement microphone (for L channel), 12 ... Operation unit.

Claims (17)

An operation unit for the listener to adjust the auditory correction so that the auditory correction reference sound has a desired auditory characteristic of the listener based on the auditory correction reference sound reproduced through the headphones;
A microphone for measuring the audible correction reference sound reproduced through a speaker at the listener's scheduled listening position;
A sound field correction unit that performs correction so that the audibility characteristic of the audible correction reference sound measured by the microphone becomes the desired audibility characteristic;
A sound field correction apparatus comprising: The sound field correction apparatus according to claim 1,
A sound field correction apparatus comprising an adjustment state storage unit that stores a state of the hearing correction adjustment. The sound field correction apparatus according to claim 1 or 2,
The sound field correction apparatus according to claim 1, wherein the sound field correction unit includes a DSP, and performs the correction by changing a setting of a coefficient of the DSP. In the sound field correction device according to any one of claims 1 to 3,
The audibility correction adjustment includes at least one of listener sound pressure level adjustment, frequency band-based listening sound pressure level adjustment, and listener preference adjustment. The sound field correction apparatus according to claim 4,
The listener's sound pressure level adjustment causes the listener to perform an adjustment so that a plurality of sound pressure levels of the audibility correction reference sounds having different sound pressure levels are felt to be equal. . The sound field correction apparatus according to claim 4,
The sound field correction apparatus according to claim 1, wherein the listening sound pressure level adjustment for each frequency band is adjusted so that the listener feels that the frequency characteristic of the reference sound for correction is substantially flat. The sound field correction apparatus according to claim 4,
The sound field correction apparatus according to claim 1, wherein the listener preference adjustment causes the listener to make an adjustment so that a frequency characteristic of the correction reference sound is in line with the preference. The sound field correction apparatus according to any one of claims 1 to 7,
The sound field correction apparatus according to claim 1, wherein the microphone is provided integrally with the headphones. In a control method for controlling a sound field correction apparatus to which a headphone, a speaker, and a microphone are connected and provided with an operation unit,
Based on the audibility correction reference sound reproduced through the headphones, the audibility correction adjustment is performed on the listener via the operation unit so that the audibility correction reference sound has a desired audibility characteristic of the listener. Operation process
A measurement process in which the audible correction reference sound reproduced through the speaker is measured by the microphone at the listener's scheduled listening position;
A sound field correction process for correcting the audibility characteristics of the audibility correction reference sound measured by the microphone to be the desired audibility characteristics;
A control method for a sound field correction apparatus comprising: A control program for controlling a sound field correction apparatus having an operation unit to which a headphone, a speaker, and a microphone are connected, by a computer,
Based on the audibility correction reference sound reproduced through the headphones, the audibility correction adjustment is performed on the listener via the operation unit so that the audibility correction reference sound has a desired audibility characteristic of the listener. Prompt
The audibility correction reference sound reproduced through the speaker is measured by the microphone at the listener's scheduled listening position,
Correction is performed so that the audibility characteristic of the audibility correction reference sound measured by the microphone becomes the desired audibility characteristic,
A control program characterized by that. The control program according to claim 10, wherein
A control program for storing a state of the hearing correction adjustment. In the control program according to claim 10 or 11,
The sound field correction apparatus includes a DSP, and performs the correction by changing a setting of a coefficient of the DSP. The control program according to any one of claims 10 to 12,
The audibility correction adjustment includes at least one of listener sound pressure level adjustment, frequency band-specific listening sound pressure level adjustment, and listener preference adjustment. The control program according to claim 13,
The listener's sound pressure level adjustment is urged to make adjustments so that the listener feels that the sound pressure levels of a plurality of sound correction reference sounds having different sound pressure levels are equal. program. The control program according to claim 13,
The control program characterized in that the listening sound pressure level adjustment for each frequency band is urged to make adjustments so that the listener feels that the frequency characteristic of the correction reference sound is substantially flat. The control program according to claim 13,
The control program for urging the listener to adjust the frequency characteristics of the reference sound for correction to be in line with the preference. A computer-readable recording medium on which the control program according to any one of claims 10 to 16 is recorded.

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