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DESCRIPTION JPS60254998

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DESCRIPTION JPS60254998
[0001]
TECHNICAL FIELD The present invention relates to a method of measuring acoustic
characteristics, and more particularly to a method of measuring the acoustic transfer
characteristic of the eyelid between a plurality of sound sources corresponding to a plurality of
channels and a listening point listening to reproduced sound from these sources. Conventionally,
as a method of measuring the acoustic transfer characteristic in the sound field created by
reproduced sound from a plurality of sound sources, one microphone is set at the listening point,
and the sound pressure frequency characteristics are In order to prevent the disturbance, a
method is generally adopted, in which one or more sound sources are sequentially driven
independently one by one, and the sound transfer characteristic at the listening point by each
sound source is measured. In such a measurement method, (1) If a human gets into the sound
field, the sound field is disturbed by the sound absorption coefficient of clothes etc., but this
effect can not be measured. (2) It is difficult to comprehensively evaluate a sound field including
a plurality of sound sources. (3) A comprehensive measurement result can not be obtained in
consideration of the effect of seeding between human ears, such as the sense of direction, the
addition effect between both ears, and the like. There were drawbacks such as. Although it is
effective to use a dummy head with microphones attached to both ears in order to compensate
for the defect of the above (1), the dummy head has directivity characteristics and complex
wavelength of the sound wave of audio frequency Because of the size of the rubble, and because
there are left and right ears, accurate evaluation of the sound field is difficult with the
conventional method of driving multiple sound sources one by one independently. is there.
SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed points, and an object of the present invention is to provide an acoustic characteristic
measurement method capable of performing accurate acoustic field evaluation. The acoustic
characteristic measurement method according to the present invention is characterized by using
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uncorrelated random noise or pseudorandom noise among a plurality of channels as source
signals for driving a plurality of sound sources. Further, according to the acoustic characteristic
measurement method according to the present invention, the received output characteristic at
the listening point is obtained by averaging the respective output signals of the microphones of
both ears of the dummy head arranged at the listening point. It is characterized in that the
acoustic transfer characteristic between the sound source and the listening point is measured
based on the difference from the previous transfer characteristic. The acoustic characteristic
measurement method according to the present invention further uses random noise or pseudo 7dam noise of uncorrelated among a plurality of channels / channels as a source signal for driving
a plurality of sound sources, and the both ears of the dummy head disposed at the listening
point. Sound output characteristic at the listening point is obtained by averaging the output
signals of the microphones, and acoustic transfer characteristic between the sound source and
the listening point based on the difference between the sound output characteristic and the
transfer characteristic before the sound source It is characterized by measuring.
Embodiment Hereinafter, an embodiment of the present invention will be described based on the
drawings. In the figure, a pair of front left and right speakers LL, IR and a pair of rear left and
right speakers 2L in a predetermined room. 2R is disposed as a sound source, and a dummy head
4 having microphones 3L and 3R attached to both ears is disposed at a listening point for
listening to the reproduced sound from the speakers of these 4 channels. The noise generators 6
to 9 for independently driving the four channel speakers LL, IR, 2L, and 2R are provided, and
random noise such as white noise generated from these noise generators 6 to 9 ( Or pseudorandom noise) through each amplifier lO ~ 13 each speaker IL. It becomes a source signal of lR,
2L, 2R. As described above, by using uncorrelated random noise between each channel as the
source signal, the distance between the microphones 3L and 3R and the speakers IL, IR, 2L and
2R even if all the speakers in the sound field are driven simultaneously. The disturbance of the
sound pressure frequency characteristic due to the difference does not occur, and the sound field
including a plurality of sound sources can be comprehensively evaluated. The output signals of
the microphones y 3 L and 3 H of both ears of the dummy head 4 are added by the adder 14 and
supplied to the analyzer 15. The sound output characteristic at the listening point is obtained by
averaging the addition output of the adder 14, and the sound source (speaker) and the listening
point (dummy head) are obtained by the difference between the sound reception output
characteristic and the transfer characteristic before the sound source. Can measure the acoustic
transfer characteristics between As described above, the sound field can be represented by one
transfer function by measuring the characteristics based on the average of the output signals of
the microphones 3L and 3R of both ears using the dummy head 4 . Here, when the characteristic
difference between the left channel and the right channel is large, the interaural effect is
generated, and a surface that can not be evaluated a little in terms of sense of direction etc. is
generated, but the characteristic difference between 3 to 6 dB in the narrow frequency range is
Since the overall evaluation does not have much influence, it can be said that the method of
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evaluating by using the average of the microphones 3L and 3R of both ears is effective when
there is not much difference in the characteristics of the left and right ears. As described above,
according to the present invention, random noise (or pseudo random noise) of uncorrelated
between channels is used as a source signal for driving a plurality of sound sources. Since sound
sources can be driven simultaneously and measured, acoustic characteristics in a sound field
including a plurality of sound sources can be comprehensively evaluated. In addition, since the
measurement of characteristics is performed based on the addition output of each output signal
of the microphones of both ears of the dummy head, a comprehensive measurement result taking
into account the sense of direction between human ears and the addition effect etc. can get.
[0002]
Brief description of the drawings
[0003]
The figure is a block diagram showing an embodiment of the present invention.
Explanation of symbols of main parts LL, IR, 2L, 2R: Speaker 3L, 3R: Microphone 4: dummy head
6 to 9: rise generator 14: adder 15: analyzer application Person Pioneer Corp. Attorney Attorney
Fujimura Motohiko
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