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DESCRIPTION JPS58151796

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DESCRIPTION JPS58151796
[0001]
The present invention relates to a microphone device capable of collecting a target sound S / N
well from a distant position, the purpose of which is to aim even if there is a noise source
between the target sound and the microphone unit. It is an object of the present invention to
provide a microphone device capable of collecting sound S / N. In general, a method of
sharpening the directivity of the microphone device itself has been used as a means for collecting
S / N of the target sound from a distant position in the microphone device. However, in many
cases there is a noise source (noise source) between the target sound and the microphone unit, in
which case the target sound can not be picked up with a S / N ratio. The present invention solves
such a conventional defect, and arranges a plurality of microphone units in a circular arc
centering on a certain point, and adds the outputs of the respective microphone units and
extracts them. is there. According to this configuration, it is possible to set the central points of
the plurality of microphone units arranged in an arc shape as a focal point, and to pick up only
the sound of this focal point. Even if there is a noise source between the sound and the sound, it
has the advantage of being able to pick up the target sound as S / N. Hereinafter, the microphone
device of the present invention will be described with reference to the drawings of the
embodiments. FIG. 1 shows an embodiment of the microphone device of the present invention. In
FIG. 1, a plurality (2N + 1) of microphone units MICI, MiC2, MiCs. Arrange these microphones)
MiCl, Mi02. MiCs: The output of MiCN is added by an adder ? ? 1, and a combined output is
taken out from the adder ? ? 1. In such a configuration, given the case where there is a sound
source at focal point F, the distance between the sound source at focal point F and microphone
units MiC1, MiC2, MiCs-9-... MiCN is Qo, The combined output of the adder ?1 is 2N + 1 times
the output of one microphone unit. On the other hand, when the sound source is at a position
other than the focal point F, the distance between the sound source and each microphone unit
MiC1, MiC2, Mi (53, river,... MiCN differs, so each microphone unit Mi (jl, MiC2, MiCs The phase
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difference occurs at the output of Mi (11 ((the output of the adder ?1 is reduced. Therefore, the
sound at the position of the focal point F can be collected best, and the sound other than the
focal point F becomes smaller due to the phase difference 0. Therefore, the focal point F and the
microphone units MiC1, Mtc2, MiCs ..... MiCN Even when there is a noise source between them,
the sound at the focal point F farther than this noise source can be well collected.
Here, the microphone unit MiC1, MLC2, MiCs ииииии MiCN is may issue a focusing effect in nondirectional, shea by the the use of directional microphones, not picked up the sound from the
back surface It can be a system, and it is possible to collect more S / N. Specifically, as a system
for a frequency of 1000 Hz and a focal point of 20 ocfn, the mutual distance between the
microphone units MiC1, MiC2, M2O3,... River, MiCN is 20, and the microphone units MiC1, MiC2.
21 single-directional micropong units were arranged. The characteristics are shown in FIG. Here,
when the focal length L0 is 1, the horizontal axis indicates the distance on the X axis, and since L
? = 200 m, 0.1 indicates a position of 20 cm from MiCl. The vertical axis is the relative value of
the output voltage, which is one division 10 dB. In FIG. 2, a is an output characteristic with
respect to the distance of the conventional microphone, b is an output characteristic of the
microphone of the present embodiment, and C is a sound collected by the conventional
microphone. It is a comparison characteristic. As understood from FIG. 2, the output
characteristic of the conventional microphone is the inverse square law with respect to the
distance, and the sound increases in inverse proportion to the distance as the distance between
the microphone unit and the sound source becomes closer. On the other hand, in the microbon of
this embodiment, sound can be collected best at the focal position (horizontal axis -1), and it is
very difficult to collect sound near or far from the focal point F. FIG. 3 shows another
embodiment of the micropon device according to the present invention. In FIG. 3, the 13
microphone units MicO, MiCl... 6 are arranged on one side, and are arranged in an arc around the
focal point F. And, the above microphone unit) MiCQ. The outputs of MiCl ░░░░░ C ░ MiC4
are added together by an adder 1111, and the combined output of the adder ?11 is configured
to be taken out through a bypass filter HPF, and the above micro pon pong y) MiCO, MiC2, MtC4,
Mtcs. The output of the MiC 6 is added by an adder 1212, and the combining output of the adder
1212 is taken out through a low pass filter LPF. и и и 6 each on one side centering around the
central axis X passing through the focus F Thirteen microphone units MiCO arranged and
arranged on a circle centered on the focal point F.
MiCl ииииии MIC6o mic interval = microponte =,) MiCO, MiCl, ML 02. ????? The micro bond
unit MiC4 has an interval of Mi04 as dl. It is set so that MzCq, MsOe ? 8 ? da, 2d, = d2. That is,
the outputs of the microphone units MtCo, MiCl,..., Mic6 collar are summed up after obtaining the
sum on the microphone interval d1 side and then used as a high band using the high-pass filter
HPF, and summed after the microphone interval 2d1 is found The low pass filter LPF is used to
use on the low frequency side. In general, the wavelength is significantly different between the
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low band and the high band, so the focusing effect is bad in the high band in the high band with
the microphone interval that shows the excellent focusing effect in the low band, and the
opposite case occurs as well. The multi-way configuration provides a microphone with a good
focusing effect over the entire band. Furthermore, since the microphone unit is shared, there are
many effects such as the number of units can be reduced. As described above, according to the
present invention, a plurality of microphone units are arranged in an arc around a certain point,
and the outputs of the plurality of microphone units are added and taken out. Only the sound of
this focal point can be picked up with one point as the focal point. Therefore, even if there is a
noise source between the microphone unit and the target sound, it has an advantage of being
able to collect the target sound by 8 / N.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing one embodiment of the microphone device of the present
invention, FIG. 2 is an output characteristic diagram of the same device, and FIG. 3 is a block
diagram showing another embodiment of the microphone device of the present invention.
yico, 1lic1. Mic2------MICN-----Microphone unit, 1.1. ? 11. Shiguma12 и и и и и и adder, HPF и и и и и
bypass filter, LPF и и и и и и pass filter, F и и и и и и focus. Name of Agent Attorney Nakao Toshio Other 1
person Figure 1 Figure 2 [LO] Figure 3
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