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JPH03162100

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DESCRIPTION JPH03162100
[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, and a video camera with the microphone mounted inside. 2. Related Art In recent years,
video integrated cameras have been gaining in popularity as devices capable of easily recording
audio and video. Along with this, the functions of video integrated cameras have also been
expanded, and downsizing and weight reduction have been achieved. Hereinafter, representative
examples of conventional video integrated cameras will be described with reference to the
drawings. FIG. 11 shows the appearance of a conventional video integrated camera. 111 is a
microphone unit, 112 is a main unit, 113 is a lens unit, and 114 is a viewfinder. The microphone
unit 111 fixes the unit via a vibration-proof material such as rubber in order to avoid the
influence of noise and vibration generated by the main unit 112, and is installed at a distance
from the main unit 112. Furthermore, a windshield is provided to reduce wind noise. 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, in the case where the microphone unit is embedded in the video integrated
camera main body as shown in FIG. 12, the microphone unit directly receives the influence of the
vibration and noise emitted from the main body portion 112. Therefore, the S / N ratio at the
time of sound collection is lowered, which causes a problem that the sound collection product
award is significantly deteriorated. Although a method using superdirectivity and a method of
removing noise using signal processing technology can be considered as a possible
countermeasure to the problem of the decrease in the S / N ratio, it is difficult in terms of space
constraints and costs. is there. Performance. ????? A microphone device that is satisfactory
in terms of cost has not been developed yet. 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,
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vibration and wind noise in the vicinity of a microphone unit using a nondirectional microphone
and a unidirectional microphone. Let's say. Means for Solving the tlB In order to achieve the
above object, the microphone device of the present invention is directed to a nondirectional
microphone unit of the same polarity and a unidirectional microphone unit with its main axis
directed to the video camera body. The two microphone units are arranged parallel or the main
axes of both units are aligned, and the output signals of both microphones are filtered after being
passed through a high pass filter.
However, the polarity of the microphone unit is determined by the positive and negative of the
output voltage generated when positive sound pressure is applied from the front of the unit. Also,
arrange the omnidirectional microphone unit and the unidirectional microphone unit with
different polarities, with the main axis facing the video integrated camera body so that both
microphone units are parallel or the main axes of both units are aligned. Then, the output signals
of both microphone units are subjected to high pass filtering and then added. In addition, the
omnidirectional microphone unit and unidirectional microphone unit of the same polarity and
the omnidirectional microphone direct the main axis of the omnidirectional microphone unit
opposite to the video integrated camera body, and the unidirectional microphone makes the main
axis video Both microphone units are arranged parallel to each other or the main axes of both
units are aligned in a straight line toward the camera body, and the output signals of both
microphone units are subjected to a high pass filter and then subtracted. The omnidirectional
microphone unit of polarity and unidirectional microphone unit 2 points, the omnidirectional
microphone has its main axis opposite to the video integrated camera body, and the
unidirectional microphone has its main axis as video camera body Position both microphone
units in parallel or with the live axes of both units aligned on a straight line, The output signal of
the B Hong unit a structure obtained by adding after passing through a high-pass filter. In
addition, when vibration is applied to the nondirectional microphone and the unidirectional
microphone in each of the above-mentioned configurations, both unisotos are fixed so that they
vibrate together. Operation The present invention makes it possible to reduce noise, vibration,
and wind noise in the vicinity of the microphone unit by the above-described system, and to
collect sound with a good S / N ratio. The microphone adaptation of the present invention uses
one nondirectional micropon and one unidirectional microphone unit as a pair. When the
polarities of both units are the same, the outputs of both units are subtracted, and when the
polarities of the units 7 are opposite to each other, the outputs of both units are added to obtain
the output of the microphone device. 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. It is
Due to this proximity effect, directional microphones will exhibit directional characteristics close
to bi-directional. Therefore, by subtracting the output of a unidirectional microphone whose main
sleeve is directed to the video camera main body with the output of a nondirectional microphone
when the polarities of both units are the same and by adding the polarities when the polarities
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are opposite to each other. To realize a microphone with low sensitivity to distant sound sources,
non-directionality in low range, similar directivity characteristics in Takashiro, and low sensitivity
to the main axis direction of the unit for close sound sources Can do
Further, as described above, since the microphone device of the present invention has
nondirectional directivity in the low band, it is possible to realize the microphone device that is
less susceptible to the influence of wind noise. Also, if the direction of the main axis of the
nondirectional microphone unit and that of the unidirectional microphone unit are the same, and
both units are fixed so that they vibrate integrally, subtraction is performed when the polarities
of both units are the same. The effect of vibration applied to the microphone unit can also be
eliminated by adding. EXAMPLE Hereinafter, a microphone device in an example of the present
invention will be described with reference to the drawings. FIG. 1 shows the discipline of
microphone purchase in the first embodiment of the present invention, in which 11 is a video
integrated camera body, 12 is a nondirectional microphone unit, and 13 is a single directivity.
14.14 indicates a high-pass filter, and l6 indicates a subtractor. Fig. 2 shows the directional
frequency characteristics when the sound source is at a distance of 1 m from the unidirectional
microphone, and Fig. 3 shows the directional frequency characteristics when the sound source is
near the unidirectional microphone. Solid lines in FIG. 2 and FIG. The broken line and the
alternate long and short dash line indicate the sensitivity in the direction of 0 degrees, 90
degrees, and 180 degrees with respect to the main axis of the microphone unit. By passing the
output signal of the unidirectional microphone unit 13 through the high pass filter 15, the sharp
increase in sensitivity in the low frequency range due to the proximity effect shown in FIG. 3 is
corrected. Furthermore, in order to match the frequency characteristic of the output signal of the
omnidirectional microphone unit 12 to the frequency characteristic of the signal passed through
the high-pass filter 15 in the low frequency range, the high bus filter 14 is used. The output of
the microphone filter is obtained by subtracting the output of the high-pass filter 14.15. FIG. 4
shows directional frequency characteristics when there is a sound source at a distance of 1 m
from the microphone of the present embodiment, and FIG. 5 shows directional frequency
characteristics when there is a sound source near the microphone device of this embodiment.
Figure 4. In the diagram of FIG. 5, solid lines and broken lines. The alternate long and short dash
lines indicate the sensitivity in the directions of 0 degrees, 90 degrees, and 180 degrees with
respect to the front of the video camera. As shown in FIG. 5, according to the microphone device
of the present embodiment, the sensitivity of the principal axis direction of the unidirectional
microphone to the sound sources in close proximity is greatly reduced. Therefore, it is possible to
reduce the influence of the noise emitted by the video integrated camera body. As described
above, according to the microphone modification of this 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 S / N ratio.
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FIG. 6 shows the structure of the microphone device according to the second embodiment of the
present invention, in which 61 is a video integrated camera main body, 64. 65 is a high pass
filter, and the above is FIG. It is similar to the IjI commandment of. 62 is a nondirectional
microphone unit, and 63 is a unidirectional microphone unit. The difference from FIG. 1 is that
the polarities of the unit 62 and the unit 63 are opposite to each other, and an adder 66 is
provided. 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 S / N ratio. FIG. 7 shows a side view of the microphone device according to the third
embodiment of the present invention, in which 71 is a video integrated camera body, 73 is a
unidirectional microphone unit, and 74.75 is a high pass. The filter 76 is an SX unit, and the
above is the same as the configuration of FIG. Reference numeral 72 denotes a nondirectional
microphone unitoto, which is different from FIG. 1 in that the main axis of the unit 72 is opposite
to the video camera body. 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 S / N ratio. FIG. 8 shows the spread of the microphone device according to
the fourth embodiment of the present invention, in which 81 is a video integrated camera main
body, 84. 85 is a high pass filter, and the above is FIG. It is the same as the configuration.
Reference numeral 82 denotes a nondirectional microphone unit, and 83 denotes a unidirectional
microphone unitoto. The difference from FIG. 7 is that the polarities of the unit 82 and the unito
83 are opposite to each other, and an adder 86 is provided. 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 S / N ratio. FIG. 9 shows the structure
of the microphone device in the fifth embodiment, in which 91 is a video integrated camera body,
94.95 is a high pass filter, 96 is a subtractor, and the above are the first. It is similar to the figure
discipline. Reference numeral 92 denotes a nondirectional microphone unit, and 93 denotes a
unidirectional microphone unit. The difference from FIG. 1 is that the main wheels of both units
are arranged in a straight line. 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 S / N ratio. FIG. 10 shows the arrangement of the microphone device in
the sixth embodiment of the present invention, in which 101 is a video integrated camera body,
104. 105 is a high-pass filter, and 106 is a subtractor. The above is the same as the discipline in
FIG.
{Circle over (2)} 02 is a nondirectional microphone unit, and 103 is a unidirectional microphone
unit, but the difference from FIG. 1 is that when vibration is applied to unit 102 and unit 103,
both units vibrate together It is a point fixed by a fixing metal 1121. According to the
microphone device of this embodiment, it is possible to reduce vibration in addition to noise and
wind noise in the vicinity of the microphone unit, and sound can be collected with a good S / N
ratio. Effect of the Invention As described above, according to the present invention, the main
axis of the omnidirectional microphone unit of the same polarity and the unidirectional
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microphone unit are directed to the main body of the video integrated camera, and both
microphone units are parallel or both Since the output signals of both microphone units are
arranged in a straight line and subtracted after passing through a high-pass filter, noise and wind
noise in the vicinity of the microphone unit can be reduced, and the S / N ratio can be reduced.
Good sound collection can be realized. Also, arrange the microphone units with the main axis
facing the main body of the video integrated camera with the main axis of the non-directional
microphone unit and the unidirectional microphone unit of different polarity mutually parallel or
with the main axes of both units aligned. By the microphone device obtained by passing the
output signals of both microphone units through a high-pass filter and adding them, it is possible
to reduce noise and noise in the vicinity of the microphone unit and realize sound collection with
a good S / N ratio. Can do In addition, the omnidirectional microphone unit with the same
polarity and the unidirectional microphone unit, the omnidirectional microphone has its main
axis opposite to that of the video integrated camera body, and the unidirectional microphone has
its main axis as the video camera body The microphone devices are arranged such that both
microphone units are parallel or the main axes of both units are aligned, and the output signals
of both microphone units are passed through a high pass filter and then subtracted to reduce
noise and wind in the vicinity of the microphone units. Noise can be reduced, and sound
collection with a good S / N ratio can be realized. In addition, the omnidirectional microphone
Uninot and Unidirectional microphone unit with mutually different polarity, the omnidirectional
microphone points its main axis opposite to the video integrated camera body, and the
unidirectional microphone is its main axis video camera Toward the main unit, both microphone
units are arranged in parallel or with the principal axes of both unisots aligned, and the output
signals of both microphone units are high-pass filtered and then added to the vicinity of the
microphone unit 7}. Noise and wind noise can be reduced, and sound collection with a good S / N
ratio can be realized.
In addition, when vibration is applied to the nondirectional microphone and the unidirectional
microphone in each of the microphone devices described above, when the directions of the main
axes of both units are the same by the microphone device fixed so that both units vibrate
integrally. It is possible to reduce noise, wind noise and vibration in the vicinity of the
microphone unit, and sound collection with a good S / N ratio can be realized.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic diagram of the microphone device in the first embodiment of the present
invention, FIG. 2 is a directional frequency characteristic diagram when there is a sound source
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at a distance of 1 m from the unidirectional microphone, and FIG. Directional frequency
characteristic diagram when there is a sound source in the vicinity of the directional microphone,
FIG. 4 is a directional frequency characteristic diagram when there is a sound source at a
distance of 1 m than the microphone device in the first embodiment of the present invention,
FIG. The directional frequency characteristic diagram when there is a sound source in the vicinity
of the microphone device in the first embodiment of the present invention, FIG. 6 is a
configuration diagram of the microphone purchase in the second embodiment of the present
invention, and FIG. FIG. 8 is a block diagram of a microphone device according to a third
embodiment of the present invention, FIG. 8 is a constitutional diagram of the microphone device
according to the embodiment of FIG. 4 according to the present invention, and FIG. 9 is a
microphone device according to the fifth embodiment Diagram of the FIG. 11 is a schematic
diagram of a microphone device according to a sixth embodiment of the present invention, FIG.
11 is an external view of a conventional video integrated camera, and FIG. 12 is an external view
of a video integrated camera incorporating a conventional microphone in a main body. Is a
diagram showing. 11, 61, 71, 81, 91, 101 ? ? ? ? ? ? Video integrated camera body, 12,
62, 72, 82, 92, 102 и и и и и и Non-directional microphone unit, 13, 63, 73, 83, 93, 103 ииииииииииии
Unidirectional microphone unit, 14, 15, 64, 65, 74, 75, 84. 85, 94, 95, 104, 105 и и и и и и и и Filters,
16, 76, 96, 106 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Adder.
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