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JPH03276998

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DESCRIPTION JPH03276998
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
environmental sound control apparatus for controlling environmental sounds so as to reduce
unpleasantness due to noise or to change the mood mainly in a noisy environment. 2. Description
of the Related Art Conventionally, as shown in FIG. 3, in order to eliminate noise in the duct 10, a
microphone 1 for detecting noise is disposed in the duct 10, and the detected noise is cancelled.
There is provided a noise reduction device for delivering such an additional sound from a
speaker 2 disposed in the duct 10. That is, the noise is canceled by causing the additional sound
transmitted from the speaker 2 to interfere with the noise based on the noise detected by the
microphone 1. In order to achieve this purpose, in the additional sound generation unit 11, based
on the noise detected by the microphone 1, the additional sound transmitted from the speaker 2
is signaled so as to be in reverse phase to the noise in the vicinity of the speaker 2. Is processing.
By the way, the above-mentioned conventional configuration is intended to cancel the noise
traveling in one direction in a limited space such as in the duct 10, and the microphone 1 and the
speaker 2 The positional relationship is fixed. On the other hand, when trying to apply the above
configuration to the removal of noise in an open three-dimensional space, the noise spreads in all
directions and the phase becomes complicated, and silencing is not sufficiently performed, and
addition from the speaker 2 in specific places The sound may be in phase with the noise and the
noise level may be rather high. That is, when the location of the noise source is not specified,
when the noise source moves, when the noise sources exist at multiple locations, and when the
whereabouts of a person can not be identified at one location, most cases of normal usage
environment In the above, it is difficult to satisfy the condition for eliminating noise by the above
configuration. The present invention is intended to solve the above-mentioned problems, and
provides an environmental sound control apparatus mainly for reducing discomfort and
changing mood by changing power spectrum distribution in a noisy environment. It is said that.
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1
In order to achieve the above object, according to the first aspect of the present invention, a
microphone for detecting a primary sound in the vicinity, a speaker for transmitting a secondary
sound, and a sound detected by the microphone And a secondary sound control unit for
controlling the power spectrum distribution of the secondary sound so that the mixed sound of
the primary sound and the secondary sound has a desired power spectrum distribution.
According to the second aspect of the invention, in the secondary sound control unit, control is
performed such that the power spectrum distribution of the mixed sound of the primary sound
and the secondary sound has a substantially 1 / f characteristic.
According to the first aspect of the present invention, the secondary sound is generated by the
speaker and mixed with the primary sound, and the power spectrum distribution of the mixed
sound is controlled to a desired characteristic, so the environmental sound is controlled. It is
possible to change the mood and reduce the discomfort in the noisy environment. According to
the configuration of claim 2, the power spectrum distribution of the mixed sound is made to have
1 / f characteristic close to the noise of the natural world, so the effect of reducing the
unpleasant feeling is further enhanced, especially if the primary sound is white noise etc. For
example, in some cases it may be possible to relax with mixed sounds. DETAILED DESCRIPTION
OF THE PREFERRED EMBODIMENT As shown in FIG. 1, a primary sound such as noise is
detected by a microphone 1 and input to a secondary sound control unit 3, and the secondary
sound control unit 3 is arranged around a person 4 A secondary sound signal corresponding to
the secondary sound sent from the provided speaker 2 is output. In the secondary sound control
unit 3, the output of the microphone 1 is amplified by the amplification circuit 5 and then
converted to a digital signal through the analog-digital conversion circuit 6. Based on this digital
signal, the secondary sound signal generation circuit 7 analyzes the power spectrum distribution
of the primary sound, and makes the mixed sound of the primary sound and the secondary sound
a desired power spectrum distribution. Generate a sound signal. For example, assuming that the
primary sound has a power spectrum distribution as shown in FIG. 2 (a), the power spectrum
distribution of the mixed sound is set to the 1 / f characteristic inversely proportional to the
frequency. It is sufficient to generate a secondary sound signal having a power spectrum
distribution of the difference between the straight line and the curve in FIG. 2 (b). In FIG. 2, P is a
power spectrum and f is a frequency. Thus, a secondary sound signal having a power spectral
distribution of the difference between the desired power spectral distribution and the power
spectral distribution of the primary sound is generated. The output of the secondary sound
generation circuit 7 is converted to an analog signal by the digital-analog conversion circuit 8,
then amplified by the amplification circuit 9, and the secondary sound is transmitted from the
speaker 2. As described above, if the power spectrum distribution of the mixed sound is set to
have 1 / f characteristics, the mixed sound becomes 1 / f noise close to noise in the natural world
(such as a small bird's song or wave sound). Pleasure can be reduced, and depending on the type
of primary sound, it may be more comfortable as relaxing. In addition, even when the power
spectrum distribution of the mixed sound does not have the 1 / f characteristic, an effect of
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2
changing the mood before and after the generation of the second sound can be obtained.
According to the first aspect of the invention, as described above, the secondary sound is
generated by the speaker and mixed with the primary sound, and the power spectral distribution
of the mixed sound is controlled to a desired characteristic. It has the advantages of being able to
control environmental sounds, to be able to change the mood and to reduce discomfort in noisy
environments.
According to the configuration of claim 2, the power spectrum distribution of the mixed sound is
made to have 1 / f characteristic close to the noise of the natural world, so the effect of reducing
the unpleasant feeling is further enhanced, especially if the primary sound is white noise etc. For
example, in some cases it may be possible to relax with mixed sounds.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram
for explaining the operation of the above, and FIG. 3 is a block diagram showing a conventional
example.
1 ... microphone, 2 ... speaker, 3 ... secondary sound control unit.
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