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JP2005309212

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005309212
[Purpose] Listeners can easily perform auditory correction according to listeners' hearing
characteristics or listeners preferences. SOLUTION: An operation unit for performing hearing
correction adjustment by the listener so that the reference sound for hearing correction becomes
a listener's desired hearing characteristic based on the reference sound for hearing correction
reproduced through the headphone 8 12 and the microphones 10 and 11 for measuring the
reference sound for auditory sense correction reproduced through the speaker 9 at the listener's
scheduled listening position, and the auditory characteristic of the reference sound for auditory
sense correction measured by the microphones 10 and 11 is desired The controller 5 controls
the DSP 4 to perform sound field correction so as to obtain the audibility characteristic of
[Selected figure] Figure 1
Sound field correction device, control method of sound field correction device, control program,
and recording medium
[0001]
The present invention relates to a sound field correction device, a control method for a sound
field correction device, a control program, and a recording medium, and more particularly to a
sound field correction device for sound field correction in a room or a vehicle interior. The
present invention relates to a control method, a control program, and a recording medium.
[0002]
FIG. 6 is an explanatory view of an equal loudness curve.
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The frequency characteristics of human hearing are analyzed in detail, and Fletcher Manson's
isosensitivity curve (isoloudness curve) as shown in FIG. 6 is well known. The horizontal axis of
the equal loudness curve is frequency, and the vertical axis is sound pressure level, and the curve
on the graph is a line connecting points that sounds like sounds of the same amplitude.
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 near 20 Hz of this curve is 118 dB.
[0003]
This indicates that the 80 kHz sound at 1 kHz and the 118 dB sound at 20 Hz sound to the same
extent for humans. As described above, the sound pressure of human hearing differs according to
the frequency, and sound field correction is conventionally performed based on the human
hearing characteristic (for example, Patent Document 1) See) Jikkyo 5-41217
[0004]
FIG. 7 is a diagram showing the average value of the ratio between the sound pressure on the
eardrum and the sound pressure at the entrance of the ear canal (= the sound pressure on the
eardrum / the entrance sound pressure at the ear canal) and the standard deviation thereof.
According to FIG. 7, it can be understood that there is a large difference between the average
value and the actual value depending on the frequency. Also, depending on the physical type of
the actual listener (listener), the listening conditions are further different, and setting common to
all the listeners is difficult. That is, only the correction based on the equal loudness curve shown
in FIG. 6 can not perform auditory sense correction matched to each listener, resulting in a
problem that auditory sense correction can not be performed reliably.
[0005]
In order to solve this, each listener may perform his own auditory correction, but it requires
specialized knowledge and technology, which can not be easily performed by general listeners.
Therefore, it is an object of the present invention to provide a sound field correction device, a
control method for the sound field correction device, a control program, and a recording medium,
which allow the listener to easily perform auditory sense correction according to the listener's
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hearing characteristic or preference of the listener. To provide.
[0006]
In order to solve the above-mentioned subject, the listener performs hearing correction
adjustment so that the reference sound for hearing correction becomes a listener's desired
hearing characteristic based on the reference sound for hearing correction reproduced through
the headphones. The operation unit, a microphone for measuring the reference sound for
auditory sense correction reproduced through the speaker at the listening scheduled position of
the listener, and a desired sensory characteristic of the reference sound for auditory sense
correction measured by the microphone And a sound field correction unit that performs
correction so as to be an auditory sensation characteristic. According to the above configuration,
in the operation unit, the listener corrects the audibility so that the audibility correction
reference sound becomes a listener's desired audibility characteristic based on the audibility
correction reference sound reproduced through the headphones. Make adjustments. Thereafter,
the reference sound for auditory sense correction reproduced by the microphone through the
speaker is measured at the listener's scheduled listening position, and the sound field correction
unit is a hearing characteristic for which the auditory characteristic of the reference sound for
auditory correction measured by the microphone is desired. Make corrections so that
[0007]
In this case, an adjustment state storage unit may be provided to store the state of the hearing
sensation correction adjustment. The sound field correction unit 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-specific listening sound pressure level adjustment, and listener
preference adjustment. Furthermore, the listener sound pressure level adjustment may be
performed so that the listeners may feel that the sound pressure levels of the reference sounds
for auditory sense correction having different sound pressure levels are equal.
[0008]
Further, the listening sound pressure level adjustment by frequency band may be performed so
that the listener feels that the frequency characteristic of the correction reference sound is
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substantially flat. Further, the listener preference adjustment may be performed so that the
frequency characteristic of the correction reference sound for the listener is in line with the
preference. Furthermore, the microphone may be integrally provided on the headphone.
[0009]
A control method for controlling a sound field correction apparatus connected with a headphone,
a speaker, and a microphone and including an operation unit includes the reference for hearing
correction based on the reference sound for audibility correction reproduced through the
headphones. An operation process for causing the listener to perform audibility correction
adjustment via the operation unit such that the sound becomes a listener's desired audibility
characteristic, and the audibility correction reference sound reproduced via the speaker. A
measurement process of measuring by the microphone at a planned listening position of the
listener, and a sound field correction process of correcting the audibility characteristic of the
audibility correction reference sound measured by the microphone to the desired audibility
characteristic; It is characterized by having.
[0010]
In addition, a control program for controlling a sound field correction apparatus connected with
headphones, a speaker, and a microphone and provided with an operation unit by a computer is
the hearing correction based on the reference sound for hearing correction reproduced through
the headphones. The auditory sense correction correction is prompted through the operation
unit so that the reference sound for the listener is the desired auditory sense characteristic, and
the auditory sense correction reference sound reproduced through the speaker is used as the
auditory sense correction characteristic. The measurement is performed by the microphone at
the listening scheduled position of the listener, and correction is performed such that the
audibility characteristic of the audibility correction reference sound measured by the microphone
becomes the desired audibility characteristic.
[0011]
In this case, the state of the audibility correction adjustment may be stored.
Further, the sound field correction device may include a DSP, and the correction may be
performed by changing a setting of the coefficient of the DSP.
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Furthermore, the audibility correction adjustment may include at least one of listener sound
pressure level adjustment, frequency band-specific listening sound pressure level adjustment,
and listener preference adjustment. Furthermore, the listener sound pressure level adjustment is
configured to prompt the listener to make the sound pressure levels of the reference sounds for
auditory sense correction having different sound pressure levels to be equal. It is also good.
[0012]
Further, the listening sound pressure level adjustment by frequency band may be made to
prompt the listener to feel that the frequency characteristic of the correction reference sound is
substantially flat. Furthermore, the listener preference adjustment may prompt the listener to
perform adjustment so that the frequency characteristic of the correction reference sound is in
line with the preference. Further, each control program may be recorded on a computer readable
recording medium.
[0013]
According to the present invention, even a general listener who does not have specialized
knowledge or technology can easily perform self-directed auditory correction.
[0014]
Next, preferred embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a schematic configuration block diagram of a sound field correction system according to
the embodiment. The sound field correction system 1 reproduces a medium (recording medium)
in which sound source data for auditory sense correction is stored, and a media reproduction
device 2 for outputting audio data for auditory sense correction, and stores various data in
advance or temporarily. Memory 3, a digital signal processor (DSP) 4 for performing various
signal processing, a controller 5 for controlling the entire sound field correction system 1, a
headphone amplifier 6, and a power amplifier for amplifying an audio signal for auditory sense
correction 7, an auditory sense correction headphone 8 for performing auditory sense correction
in a state where the listener is worn, a speaker 9 for outputting an auditory sense correction
voice based on the amplified auditory sense correction voice signal, and an operation for
performing various operations A unit 12 is provided.
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[0015]
The controller 5 is configured as a so-called computer, and a ROM (not shown) storing a control
program for controlling the sound field correction system 1 in advance, a RAM (not shown)
temporarily storing various data, and control in the ROM And a CPU (not shown) that performs
control based on a program. The auditory sense correction headphone 8 includes a first
measurement microphone (for R channel) 10 to which the auditory sense correction voice output
from the speaker 9 is input, and a second to which the auditory sense correction voice output
from the speaker 9 is input. A measurement microphone (for L channel) 11 is provided.
[0016]
FIG. 2 is a process flowchart of auditory sense correction processing. First, when the auditory
sense correction process is instructed via the operation unit 12, the controller 5 determines
whether the medium M in which the audio source correction sound source data is stored is
inserted into the media reproduction device 2 (step S1). . If it is determined in step S1 that the
media M is inserted, the controller 5 causes the media playback device 2 to play back the media
M to output the auditory sense correction audio data, 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
auditory sense correction audio data stored in the memory 3 and shifts the processing to step S3
(step S3). S8). Next, the controller 5 performs an auditory sense correction adjustment process
(step S3).
[0017]
FIG. 3 is a processing flowchart of auditory sense correction adjustment processing. Further, FIG.
4 is a common processing flowchart of each adjustment processing in the auditory sense
correction adjustment processing. First, when the controller 5 shifts to the audibility correction
adjustment process, the controller 5 performs a listener sound pressure level adjustment process
(step S11). In the listener sound pressure level adjustment process, the controller 5 adjusts the
listener sound pressure level between two different sound pressure levels to the DSP 4 via the
headphone amplifier 6 and the audibility correction headphone 8 based on the audibility
correction audio data A reference sound (= reference sound for auditory sense correction) is
outputted and reproduced (step S21).
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[0018]
The listener can hear the listener sound pressure level adjustment reference sound
corresponding to the R channel through the headphone amplifier 6 and the hearing aid
headphone 8 to the right ear. Similarly, the listener can hear the listener sound pressure level
adjustment reference sound corresponding to the L channel at the left ear via the headphone
amplifier 6 and the auditory sense correction headphone 8. As a result, the listener rotates the
volume knob (not shown) of the operation unit 12 to adjust the sound pressure levels of the L
and R channels to the same position (step S22). As described above, the listener sound pressure
level adjustment reference sound has two types of sound pressure levels, so adjustment is
performed twice for each sound pressure level. Subsequently, the controller 5 determines
whether or not a confirmation instruction to the effect that the adjustment process of the listener
has ended is input through the operation unit 12 (step S23).
[0019]
If it is determined in step S23 that the listener has not input a confirmation instruction to the
effect that the adjustment processing has been completed (step S23; No), that is, if the listener
has input a confirmation instruction for readjustment, the process is again performed The
process proceeds to S21, and the same processing is performed. If it is determined in step S23
that the listener inputs a confirmation instruction to the effect that the adjustment processing
has been completed (step S23; Yes), the controller 5 records the adjustment content in the
memory 3 to adjust the listener sound pressure level The process ends, and the process proceeds
to step S12. As a result, the difference in the listener's hearing sensitivity depending on the
sound pressure level is detected. Although the number of types of sound pressure levels is two in
the above description, three or more types of sound pressure levels may be adjusted.
Subsequently, the controller 5 performs the listening sound pressure level adjustment process by
frequency band (step S12).
[0020]
In the frequency band-specific listening sound pressure level adjustment process, the controller 5
controls the listening sound pressure level adjustment for each of a plurality of frequency bands
via the headphone amplifier 6 and the hearing sense correction headphone 8 in the DSP 4 based
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on the audibility correction voice data. The sound (= reference sound for auditory sense
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 through the headphone amplifier 6 and the headphone 8 for
audibility correction. 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 through the headphone amplifier 6 and the headphone 8 for auditory sense correction.
As a result, the listener rotates the volume knob (not shown) of the operation unit 12 to adjust to
a position where the frequency characteristic is felt to be flat over the entire frequency band
(step S22).
[0021]
Subsequently, the controller 5 determines whether or not a confirmation instruction to the effect
that the adjustment process of the listener has ended is input through the operation unit 12 (step
S23). If it is determined in step S23 that the listener has not input a confirmation instruction to
the effect that the adjustment processing has been completed (step S23; No), that is, if the
listener has input a confirmation instruction for readjustment, the process is again performed
The process proceeds to S21, and the same processing is performed. 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 content in
the memory 3 and listens to the sound pressure by frequency band. The level adjustment process
ends, and the process proceeds to step S13. As a result, a state in which the listener feels that the
frequency characteristic is flat is detected.
[0022]
Subsequently, the controller 5 performs listener preference adjustment processing (step S13). In
the listener preference adjustment process, the controller 5 outputs the listener preference
adjustment reference sound (= reference sound for auditory sense correction) to the DSP 4
through the headphone amplifier 6 and the hearing correction headphone 8 based on the audio
data for auditory sense correction And reproduce (step S21). The listener can hear the listener's
preference adjustment reference sound corresponding to the R channel through the headphone
amplifier 6 and the aural sense correction headphone 8 to the right ear. Similarly, the listener
can hear the listener's preference adjustment reference sound corresponding to the L channel to
the left ear via the headphone amplifier 6 and the hearing correction headphones 8.
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[0023]
As a result, the listener rotates the volume knob (not shown) of the operation unit 12 to adjust it
to a position where the reproduced sound feels like the listener's favorite frequency
characteristic, as in the case of so-called graphic equalizer adjustment (step S22). Subsequently,
the controller 5 determines whether or not a confirmation instruction to the effect that the
adjustment process of the listener has ended is input through the operation unit 12 (step S23).
[0024]
If it is determined in step S23 that the listener has not input a confirmation instruction to the
effect that the adjustment processing has been completed (step S23; No), that is, if the listener
has input a confirmation instruction for readjustment, the process is again performed The
process proceeds to S21, and the same processing is performed. If it is determined in step S23
that the listener inputs a confirmation instruction to the effect that the adjustment processing
has been completed (step S23; Yes), the controller 5 records the adjustment content in the
memory 3 and performs listener preference adjustment processing. The process ends, and the
process proceeds to step S4. As a result, the frequency characteristic preferred by the listener is
detected.
[0025]
FIG. 5 is a processing flowchart of auditory sense correction calculation processing. First, the
controller 5 checks the number of auditory sense corrections (step S31). If it is determined in
step S31 that the number of times of auditory sense correction is the second or later, the process
proceeds to step S33. In the determination of step S31, when the number of times of auditory
correction is the first, the controller 5 controls the DSP 4 using the sound source data for sound
field measurement out of the sound source data for auditory sense correction to obtain the
reference for sound field measurement. Sound (constituting audio for audio sense correction) is
output through the power amplifier 7 and the speaker 9, and the controller 5 outputs audio for
audio field audio sense correction output from the speaker 9 for the first measurement
microphone 10 and the second measurement. The measurement is made by the microphone 11
to measure the reference characteristic (step S32).
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[0026]
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 sense correction adjustment processing
(steps S11 to S13) (step S33). Next, the controller 5 calculates DSP coefficients based on the
calculated correction data (step S5). As a result, the DSP 4 reads out 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. It outputs (step S6).
[0027]
Subsequently, the controller 5 determines whether or not a confirmation instruction indicating
that the listener's check has been completed has been input through the operation unit 12 (step
S7). If it is determined in step S7 that the listener has not input a confirmation instruction to the
effect that the check has ended (step S7; No), that is, if the listener has input a confirmation
instruction for readjustment, the process is again performed in step S3. And the same processing
is performed. If it is determined in step S7 that the listener inputs a confirmation instruction to
the effect that the adjustment processing has been completed (step S7; Yes), the controller 5 ends
the processing.
[0028]
As described above, according to the present embodiment, even a general listener who does not
have specialized knowledge or technology can easily perform auditory correction in accordance
with the listener's auditory characteristics or the preference of the listener. Is possible.
[0029]
In the above description, the case where the control program for controlling the sound field
correction device 1 is stored in advance in the ROM constituting the controller 5 has been
described, but various recording media such as magnetic disks, optical disks and memory cards
may be used. The control program may be recorded in advance, read from these recording
media, and installed.
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In addition, it is possible to provide a communication interface, download the control program
via a network such as the Internet or LAN, and install and execute the control program. With this
configuration, it is possible to configure a sound field correction apparatus that is more
sophisticated in software or easier to use.
[0030]
FIG. 1 is a schematic block diagram of a sound field correction system according to an
embodiment. It is a processing flow chart of hearing sense correction processing. It is a
processing flow chart of hearing sense correction adjustment processing. It is a common
processing flowchart of each adjustment processing in audibility correction adjustment
processing. It is a processing flow chart of hearing sense correction calculation processing. 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 at the entrance of the ear
canal, and its standard deviation.
Explanation of sign
[0031]
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
Headphones for auditory sense correction 9 Speaker Speaker 10 first measurement microphone
(for R channel) 11 second measurement microphone (for L channel) 12 operation unit.
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