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JPH0738986

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DESCRIPTION JPH0738986
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
case where an acoustic signal listener moves in the acoustic signal reproduction space in the
acoustic signal reproduction space and the listening point changes, or a speaker provided in the
acoustic signal reproduction device. The present invention relates to an acoustic signal
reproduction system capable of easily correcting the acoustic characteristic at the listening point
after the change when the installation position changes or the acoustic characteristic of the
acoustic signal reproduction space changes.
[0002]
2. Description of the Related Art Conventionally, as a method of correcting acoustic signal
characteristics in an acoustic signal reproduction system, as a first method, a storage device is
provided in advance in an acoustic signal reproduction device, and several types of correction
acoustic characteristics are stored in the storage device. There is a method of recording and
selecting one of the correction acoustic characteristics at the time of reproducing an acoustic
signal to correct the characteristics of the reproduced sound.
[0003]
As a second method, the acoustic signal characteristic of the listening point in the acoustic signal
reproduction space is measured, and in the acoustic signal reproduction apparatus, acoustic
characteristic correction means is inserted between the signal source and the amplifier, and the
measurement result is referred to. Correction of acoustic characteristics.
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[0004]
However, the distance between the listening point and the plurality of speakers provided in the
sound signal reproducing apparatus is not equal, so that the wavefront of the reproduction sound
signal from each speaker is deviated at the listening point. In the case where the sound
characteristics between the speakers and the listening point are different due to differences in
the sound absorption coefficient around the installation location of the speakers, etc., a difference
occurs in the sound pressure of the reproduced sound signal from each speaker There were
issues such as things.
[0005]
Further, in the first method described above, it is desirable that the correction according to the
first method is performed because the acoustic characteristics of each of the acoustic signal
reproduction spaces are different or the acoustic characteristics of the individual speaker units
are different. There were cases where the correction characteristics of were not obtained.
In the second method, the operation for changing the sound signal correction characteristic is
complicated, so that when the listener changes the listening position in the sound signal
reproduction space, the correction characteristic is changed in a short time. In addition, there
have been problems such that the desired acoustic characteristics may not be obtained with the
correction characteristics as set previously.
[0006]
The present invention solves such problems, and in the acoustic signal reproduction system,
when the installation position of the acoustic signal reproduction device and the position of the
listener change, or when the acoustic characteristics of the acoustic signal reproduction space
change. An object of the present invention is to provide an audio signal reproduction system
capable of easily changing correction characteristics of reproduced sound in a short time and
changing the correction characteristics for each positional relationship and each sound
reproduction space. It is a thing.
[0007]
SUMMARY OF THE INVENTION In order to solve the above problems, an acoustic signal
reproduction system according to the present invention comprises an acoustic signal
reproduction device and a remote control device for remotely operating the acoustic signal
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reproduction device. In the signal reproduction system, the remote control device has acoustic
signal measurement means, and the acoustic signal reproduction device comprises acoustic
signal transmission means, at least two speakers, and acoustic signal characteristic correction
means. The acoustic signal characteristic correction means causes the acoustic signal transmitted
by the acoustic signal transmission means to propagate to the acoustic space by the speaker, and
the propagated acoustic signal is measured by the acoustic signal measurement means, and this
measurement is performed. Based on the results, the wave fronts of the acoustic signals emitted
from the speakers are aligned at the listening point, and the sound pressures of the acoustic
signals emitted from the speakers are equal at the listening point It is characterized in that
corrected for.
[0008]
The acoustic signal characteristic correction means is provided with a number equal to the
number of the loudspeakers, and delays the reproduced acoustic signal source, and the delay
time by the arrival time difference of the acoustic signal from each loudspeaker measured by the
acoustic signal measurement means Delay time setting means for setting the delay time of the
amplifier, an amplifier for amplifying the output signal of the delay unit, and the amplification
factor of the amplifier based on the sound pressure difference of the acoustic signal from each
speaker measured by the acoustic signal measuring means And amplification factor setting
means.
[0009]
According to the present invention, according to the above configuration, acoustic signals from a
plurality of speakers provided in the acoustic signal reproducing apparatus are measured at the
position of an acoustic signal listener having the remote control device, and each acoustic signal
from each speaker is measured. Each channel from each speaker at the listening point
corresponds to the acoustic characteristic of the individual acoustic signal reproduction space or
the individual listening position or the individual speaker unit by finding the difference in arrival
time of the signal and the sound pressure difference of each acoustic signal. It is possible to
perform correction so that there is no deviation in the wave front of the reproduced acoustic
signal, and the sound pressure of the reproduced acoustic signal of each channel from each
speaker becomes equal.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the acoustic
signal reproduction system of the present invention will be described below with reference to the
drawings.
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[0011]
FIG. 1 is a block diagram of an acoustic signal reproduction system according to a first
embodiment.
[0012]
Reference numeral 11 denotes a remote control device, which comprises an impulse sound
transmission command transmission means 12, an impulse sound measurement means 13, an
impulse sound time difference detection means 14, and an impulse sound / sound pressure
difference detection means 15.
An acoustic signal reproduction apparatus 16 comprises an impulse sound transmission
instruction reception unit 17, an impulse sound generation unit 18, a first acoustic characteristic
correction unit 19, a second acoustic characteristic correction unit 20, an acoustic signal
reproduction unit 21, and a reproduction acoustic signal. It comprises a source 22 and at least
two speakers (not shown).
[0013]
The first acoustic signal correction means 19 or the second acoustic signal correction means 20
is provided in the acoustic signal reproduction device 16 by the same number as the speakers
provided in the acoustic signal reproduction device 16.
In the present embodiment, two speakers are provided, and thus two acoustic signal correction
means are provided.
[0014]
First, an impulse sound transmission instruction is transmitted to the acoustic signal
reproduction device 16 by the impulse sound transmission instruction transmission means 12
provided in the remote control device 11.
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The transmission command is received by the impulse sound transmission command receiving
means 17 provided in the acoustic signal reproduction device 16 and transmitted to the impulse
sound generation means 18.
Thereafter, the impulse sound generation means 18 transmits an impulse sound to each of the
speakers provided in the acoustic signal reproduction device 16.
The impulse sound emitted for each of these speakers propagates in the acoustic signal
reproduction space, and is measured by the impulse sound measurement means 13.
The impulse sound time difference detection means 14 detects the time difference of the arrival
time of the impulse sound from each of the speakers to the remote control device 11 based on
the measured impulse sound.
Further, based on the measured impulse sound, the impulse sound pressure difference detection
means 15 detects the difference in sound pressure value for each speaker unit at the listening
point.
The detection result of the time difference and the detection result of the sound pressure
difference are transmitted from the remote control device 11 to the acoustic signal reproduction
device 16 by the detection means, and the first acoustic signal correction means 19 and the
second acoustic signal correction means 20 Received by
[0015]
Thereafter, the first acoustic signal correction means 19 and the second acoustic signal
correction means 20 correct the acoustic signal emitted from the reproduction acoustic signal
source 22, and transmit the reproduction signal to the acoustic signal reproduction means 21.
[0016]
In the measurement of the impulse sound, the order of channels for transmitting the impulse
sound is determined in advance, and the time interval of the impulse sound transmission is
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assumed to be sufficiently longer than the reverberation time of the acoustic signal reproduction
space.
This makes it possible to determine which channel the impulse sound measured in the impulse
sound measurement means 13 is from.
[0017]
FIG. 2 is an internal block diagram of the first acoustic characteristic correction means 19 or the
second acoustic characteristic correction means 20 shown in FIG.
[0018]
A delay unit 24 delays the signal input from the reproduction acoustic signal source 22 by the
time set by the delay time setting means 25.
An amplifier 26 amplifies the reproduction acoustic signal delayed by the delay unit 24 at the
amplification factor set by the amplification factor setting means 27. Here, the delay time setting
means 25 determines the delay time based on the time difference detected by the impulse sound
time difference detection means 14. As a result, the acoustic signals of the two channels output
from the reproduction acoustic signal source 22 are delayed by the arrival time difference by
delaying the acoustic signal of the channel whose arrival time to the listening point is shorter, so
that each channel The wave front of the lens is reached without deviation. Further, the
amplification factor setting means 27 determines the amplification factor based on the sound
pressure difference detected by the impulse sound pressure difference detection means 15. As a
result, the acoustic signals of the two channels output from the reproduction signal source 22 are
corrected so that the sound pressures of the respective channels become equal at the listening
point.
[0019]
Such a configuration makes it possible to correct the acoustic signal corresponding to the
individual acoustic characteristics of the space where the acoustic signal is reproduced, and the
listener having the remote control device 11 can reproduce the reproduced sound at the listening
point at which the above measurement is performed. There is no deviation of the wave front
between each channel due to the difference in distance between the installation location of each
speaker and the listening point, and the reproduced sound output from the signal source 22 is
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different due to the difference in acoustic characteristics between each speaker and listening
point It becomes possible to listen so that there is no sound pressure difference between each
channel.
[0020]
Also, when the listener having the remote control device 11 moves in the acoustic signal
reproduction space and the listening point changes, or when the installation location of the
acoustic signal reproduction device 16 changes in the acoustic signal reproduction space, an
impulse is generated. The impulse sound is measured using the remote control device 11
provided with the sound measurement means 13 and correction is performed based on the
measurement result to correspond to the listening point after the change and the installation
place of the acoustic signal reproduction device 16 It becomes possible to easily correct the
acoustic signal characteristics.
[0021]
In the present embodiment, the sound propagated in the sound reproduction space has been
described as an impulse sound, but the present invention is not limited to this and other sound
signals may be used.
[0022]
As described above, according to the present invention, acoustic signals respectively transmitted
from a plurality of speakers of an acoustic signal reproduction apparatus are measured by a
remote control device provided with acoustic signal measuring means, By determining the arrival
time difference and the sound pressure difference of the sound signal, the wave front of the
reproduced sound from each speaker does not shift between each channel at the position of the
listener with the remote control device, and the sound pressure from each speaker It is possible
to reproduce the sound signal so that there is no difference between the two, thereby easily
changing the correction characteristics of the reproduced sound in a short time, and changing
the correction characteristics for each positional relationship and each sound reproduction space
It is possible to
[0023]
Brief description of the drawings
[0024]
1 is a block diagram of an acoustic signal reproduction system according to a first embodiment
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of the present invention.
[0025]
2 is a block diagram of the acoustic signal correction means according to the first embodiment of
the present invention
[0026]
Explanation of sign
[0027]
11 remote control device 12 impulse sound transmission command transmission means 13
impulse sound measurement means 14 impulse sound time difference detection means 15
impulse sound sound pressure difference detection means 16 acoustic signal reproduction means
17 impulse sound transmission instruction reception means 18 impulse sound generation means
19 first Acoustic signal correction means 20 second acoustic signal correction means 21 acoustic
signal reproduction means 22 reproduction acoustic signal source 23 acoustic signal
characteristic correction means 24 delay device 25 delay time setting means 26 amplifier 27
amplification factor setting means
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