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DESCRIPTION JPH0458699

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DESCRIPTION JPH0458699
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone device for reducing noise, vibration and wind noise in the vicinity of a microphone
unit. 2. Description of the Related Art In recent years, video cameras have become increasingly
popular as devices capable of easily recording audio and video. Along with that, the function of
the video integrated camera has been expanded, and reduction in size and weight has been
achieved. Hereinafter, representative examples of conventional video integrated cameras will be
described with reference to the drawings. FIG. 5 is an external view of a conventional video
integrated camera. In order to avoid the influence of noise and vibration generated by the main
unit, the microphone unit 1 fixes the unit via a vibration-proof material such as rubber and is
disposed at a distance from the main unit 2. Furthermore, a windshield is provided to reduce
wind noise. SUMMARY OF THE INVENTION However, when the video integrated camera is
further miniaturized, the configuration of the video integrated camera as described above has
problems in terms of both practicality and design. On the other hand, when the microphone unit
4 is embedded in the video-integrated camera main body 3 as shown in FIG. 6, the microphone
part 4 is directly affected by the vibration and noise generated by the main body. Therefore, the
signal-to-noise ratio at the time of sound collection is lowered, causing a problem that the sound
collection quality is significantly deteriorated. Although a method using superdirectivity and a
method of removing noise using signal processing techniques can be considered as effective
measures against the problem of the reduction of the SN ratio, it is difficult in terms of space
constraints and cost. For the reasons described above, it is the fact that a microphone device that
can be satisfied in terms of performance, design, and cost has not yet been developed. An object
of the present invention is to provide a microphone device capable of collecting noise with a
good S / N ratio by reducing noise, vibration and wind noise in the vicinity of a microphone unit
using a nondirectional microphone and a unidirectional microphone. Means for Solving the
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Problem In order to achieve the above object, the microphone it according to the present
invention has a non-directional microphone unit and a bi-directional microphone unit with its
main axis facing the video integrated camera body and both microphone units parallel or The
principal axes of both units are arranged in a straight line, and after passing the output signal of
the bi-directional microphone unit through an equalizer, subtraction is performed when both
units have the same polarity, and addition is performed when the both have different polarities. .
However, the polarity of the microphone unit is determined by the positive and negative of the
output voltage generated when a positive sound pressure is applied from the front of the unit.
In addition, the omnidirectional microphone unit and the bidirectional microphone unit are
arranged with their main axes facing the video integrated camera body so that both microphone
units are parallel or the main axes of both units are aligned. After passing the output signal of the
bidirectional microphone unit through the equalizer, addition is performed when both units have
the same polarity, and subtraction is performed when the units have different polarities. Also, the
omnidirectional microphone unit and the bidirectional microphone unit, the omnidirectional
microphone directs its main axis to the video integrated camera body, and the bidirectional
microphone directs its main axis to the video integrated camera body The microphone units are
arranged parallel or the main axes of both units are aligned, and after passing the output signal
of the bidirectional microphone unit through the equalizer, addition is performed when both
units have the same polarity, and the polarities are different from each other. In the case of, the
configuration is subtracted. In addition, the omnidirectional microphone unit and the
bidirectional microphone unit, the omnidirectional microphone directs its main axis to the video
integrated camera main body, and the bidirectional microphones their main axis to the video
integrated camera main body When both microphone units are arranged in parallel or with the
main axes of both units aligned on a straight line and the output signal of the bidirectional
microphone unit passes through an equalizer, subtraction is performed when both units have the
same polarity. When the polarities are different from each other, they are added. Further, in the
above-described configurations, when vibration is applied to the nondirectional microphone and
the bidirectional microphone, both units are fixed so as to integrally vibrate. Operation According
to the present invention, with the above-described configuration, noise, vibration and wind noise
in the vicinity of the microphone unit can be reduced, and sound can be collected with a good SN
ratio. The microphone device of the present invention uses each of the nondirectional
microphone and the bidirectional microphone as a pair. When using a microphone close to a
point sound source, the wave front of the sound wave is a spherical wave, and the sound
pressure gradient is larger than when the wave front is far from the sound source and the wave
front is a plane wave. The sound pressure sensitivity in the degree direction is lifted around the
low frequency range. By this proximity effect, the frequency characteristic of the bi-directional
microphone in a high sensitivity state (the state in which the sensitivity is high) is matched with
the frequency characteristic of the nondirectional microphone using an equalizer. Then, by
adding or subtracting the output signals of the two units so as to cancel the signals from the
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noise source directions of the two units, non-directionality in the low range, and single in the
high range It is possible to realize a microphone device having directivity characteristics similar
to directivity and having low sensitivity to the principal axis direction of the unit with respect to a
close source.
In addition, as described above, the microphone device according to the present invention has
nondirectional directivity in the low band, so that it is possible to realize a microphone device
that is less susceptible to wind noise. Furthermore, by fixing the omnidirectional microphone unit
and the bidirectional microphone unit to vibrate integrally, the influence of vibration applied to
the microphone unit can be eliminated. Embodiment Hereinafter, a microphone device according
to an embodiment of the present invention will be described with reference to the drawings. FIG.
1 shows the configuration of a microphone device according to an embodiment of the present
invention, in which 11 is a video integrated camera body, 12 is a nondirectional microphone unit,
13 is a bidirectional microphone unit, 14 is An equalizer 15 indicates a subtractor, and the nondirectional microphone unit 12 and the bi-directional microphone unit 13 are disposed in
parallel with their main axes facing the video camera body 11, as shown in the figure. The same
polarity is used for these. The output of the bi-directional microphone unit 13 is input to the
equalizer 14 so that the output signal when the sound source of the bi-directional microphone
unit 13 is near matches the frequency characteristic of the non-directional unit 12. FIG. 2 shows
the bi-directional microphone device frequency characteristics after passing through the
equalizer when the sound source is at a distance of 1 m and a distance of 2 CI respectively from
the bi-directional microphone unit 13 in FIG. The solid line and the broken line represent the
sensitivity in the directions of 0 and 180 degrees with respect to the main axis of the microphone
unit, respectively. The output of the microphone device of this embodiment is obtained by
subtracting the output of the equalizer 14 from the output signal of the nondirectional unit 12
obtain. 3 shows the frequency characteristics when the sound source is at a distance of 1 m from
the microphone device of this embodiment, and FIG. 4 shows the frequency characteristics when
the sound source is near the microphone device of this embodiment. In the diagram of FIG. 4, the
solid line and the broken line respectively indicate the sensitivity in the direction of 0 degree and
180 degrees with respect to the front of the video integrated camera. As seen in FIG. It becomes
uni-directional for the sound source that Therefore, the influence of the noise emitted by the
video integrated camera body can be reduced. As described above, according to the microphone
device of the present embodiment, it is possible to reduce noise and wind noise in the vicinity of
the microphone unit, and sound can be collected with a good SN ratio. In the present
embodiment, although the nondirectional microphone unit and the bidirectional microphone unit
have the same polarity, the nondirectional microphone unit and the bidirectional microphone
unit having different polarities are used as main axes of the nondirectional microphone unit and
the bidirectional microphone unit. Is arranged in parallel with the video integrated camera body,
and the output signal of the bi-directional microphone unit is added to the signal passed through
the equalizer to the output signal of the non-directional microphone unit as shown in FIG. The
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same characteristics as those of the microphone device of the configuration can be obtained,
noise and wind noise in the vicinity of the microphone unit can be reduced, and sound collection
with a good SN ratio can be realized.
Also, arrange the non-directional microphone unit of the same polarity and the bi-directional
microphone unit parallel to each other with the main axis facing the video integrated camera
body in the reverse direction, and equalize the output signal of the bidirectional microphone unit.
A configuration in which the output signal of the omnidirectional microphone unit is added to the
passed signal, or the omnidirectional microphone unit and the omnidirectional microphone unit
having mutually different polarities, with the main axis reversed with respect to the video
integrated camera main body The microphone apparatus having the configuration shown in FIG.
1 according to the microphone device having a configuration in which the output signal of the bidirectional microphone unit is arranged parallel to each other and the signal passing through the
equalizer is subtracted from the output signal of the non-directional microphone unit. The same
characteristics as the device can be obtained, and noise and wind noise near the microphone unit
It is possible to reduce, it can be collected sound SN ratio. In addition, the omnidirectional
microphone unit of the same polarity and the bidirectional microphone unit are directed to the
main body of the video integrated camera body with the nondirectional microphone unit, and the
main axis of the omnidirectional microphone unit is the video integrated camera body In
contrast, the output signals of the bidirectional microphone unit are arranged parallel to each
other, and the output signal of the bidirectional microphone unit is added to the signal passed
through the equalizer to the output signal of the omnidirectional microphone unit. The
omnidirectional microphone unit directs the main axis of the unit and bi-directional microphone
unit to the video integrated camera body, and the bi-directional microphone unit parallels the
main axis oppositely to the video integrated camera body Arrange the output signal of the
bidirectional microphone unit through the equalizer By subtracting the output signal of the
nondirectional microphone unit, characteristics similar to those of the microphone device having
the configuration shown in FIG. 1 can be obtained, and noise and wind noise in the vicinity of the
microphone unit can be reduced. Thus, sound can be collected with a good SN ratio.
Furthermore, the omnidirectional microphone unit of the same polarity and the bidirectional
microphone unit, the omnidirectional microphone unit has its main axis opposite to the video
integrated camera body, and the bidirectional microphone unit has its main axis as the video A
configuration in which the output signal of the bi-directional microphone unit is arranged
parallel to the integrated camera body and the output signal of the non-directional microphone
unit is subtracted from the signal passing through the equalizer, or non-directional of different
polarity from each other The microphone unit and the bi-directional microphone unit, the nondirectional microphone has its main axis opposite to the video integrated camera body, and the
bi-directional microphone has its main axis oriented parallel to the video integrated camera main
body Output signal of the bidirectional microphone unit from the signal passed through the
equalizer By adding to the output signal of the directional microphone unit, characteristics
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similar to those of the microphone device having the configuration shown in FIG. 1 can be
obtained, and noise and wind noise near the microphone unit can be reduced. , Good sound
collection of the SN ratio.
Also, the same characteristics as the microphone device of the configuration of FIG. 1 can be
obtained by any of the above-mentioned microphone devices arranged so that the main axes of
both units of the nondirectional microphone and the bidirectional microphone are aligned. It is
possible to reduce noise and wind noise in the vicinity of the microphone unit, and sound can be
collected with a good S / N ratio. Furthermore, by fixing both units so as to vibrate integrally,
even if vibration is applied to the nondirectional microphone and the bidirectional microphone,
the same characteristics as the microphone device of the configuration of FIG. 1 can be obtained.
As well as reducing noise and wind noise in the vicinity of the microphone unit, it is also possible
to reduce vibration noise due to vibration applied to the microphone device, and sound can be
collected with a good SN ratio. As described above, according to the present invention, the main
axis of the omnidirectional microphone unit and the bidirectional microphone unit is directed to
the main body of the video integrated camera so that both microphone units are parallel or the
main axes of both units are aligned. And the output signal of the bidirectional microphone unit is
passed through the equalizer, and then subtraction is performed when both units have the same
polarity and addition when they have different polarities, noise in the vicinity of the microphone
unit and Wind noise can be reduced, and sound collection with a good SN ratio can be realized. In
addition, the omnidirectional microphone unit and the bidirectional microphone unit are
arranged with their main axes facing the video integrated camera body so that both microphone
units are parallel or the main axes of both units are aligned. Noise and wind noise in the vicinity
of the microphone unit are reduced by the microphone apparatus which adds the output signals
of the bidirectional microphone unit through the equalizer and then subtracts them when both
units have the same polarity, and subtracts them when the polarities are different from each
other. It is possible to realize sound collection with a good S / N ratio. Also, the omnidirectional
microphone unit and the bidirectional microphone unit, the omnidirectional microphone directs
its main axis to the video integrated camera body, and the bidirectional microphone directs its
main axis to the video integrated camera body The microphone units are arranged parallel or the
main axes of both units are aligned, and after passing the output signal of the bidirectional
microphone unit through the equalizer, addition is performed when both units have the same
polarity, and the polarities are different from each other. In this case, by making a subtraction
configuration, it is possible to reduce noise and wind noise in the vicinity of the microphone unit,
and sound collection with a good SN ratio can be realized.
In addition, the omnidirectional microphone unit and the bidirectional microphone unit, the
omnidirectional microphone directs its main axis to the video integrated camera main body, and
the bidirectional microphones their main axis to the video integrated camera main body When
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both microphone units are arranged in parallel or with the main axes of both units aligned on a
straight line and the output signal of the bidirectional microphone unit passes through an
equalizer, subtraction is performed when both units have the same polarity. When the polarities
are different from each other, by adding them, it is possible to reduce noise and wind noise in the
vicinity of the microphone unit, and sound collection with a good SN ratio can be realized. In
addition, when vibration is applied to the nondirectional microphone and the bidirectional
microphone in each of the microphone devices described above, by fixing both units to integrally
vibrate, noise, wind noise and vibration in the vicinity of the microphone unit are generated. Can
be reduced, and sound collection with a good SN ratio can be realized.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram of a microphone device according to an embodiment of the present
invention, FIG. 2 is a frequency characteristic diagram of a bi-directional microphone after
passing through an equalizer, and FIG. 3 is a microphone device according to an embodiment of
the present invention. Figure 4 shows the frequency characteristics when there is a sound source
at a distance of 1 m, Figure 4 shows the frequency characteristics when there is a sound source
near the microphone device in one embodiment of the present invention, and Figure 5 shows the
appearance of a conventional video camera FIG. 6 is an external view of a video integrated
camera in which a microphone is incorporated in the main body.
11 ・ ・ ・ ・ ・ ・ Video integrated camera body, 12 · · · Nondirectional microphone unit, 13 · ·
· Bidirectional microphone unit, 14 · · · · · · · Equalizer, 15 ... Subtractor. Name of Agent Attorney
Shigetaka Hino 1st person first! M liquid vI characteristics with a figure of 1 m and a figure layer
of 1 m. 1llliil sex Mike Ω Honku town number number "Kaikan 411F 1h 3 and 5 ll I pickled four"
raw
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