JPS5827496

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DESCRIPTION JPS5827496
[0001]
The present invention relates to a sound collecting method suitable for use in collecting sound
from a sound source via a microphone without being affected by so-called wind noise and the
like, and its system #. A wind noise is a microphone when, for example, sound is collected. Noise
such as "Bokobokko" "bo ... 11 ....." generated as output when air flow, breath, etc. are received, it
is extremely effective to prevent the influence of this wind noise to be a good sound collection It
is important. Therefore, in order to prevent the influence of such wind noise, a sound collecting
method having a windshield as shown in FIG. 1 and FIG. 2 has been proposed. That is, FIG. 1
completely covers the microphone (1) with a windshield (2) using a foam such as urethane 7
ohm, or a sintered body such as metal or resin, and FIG. The whole of the microphone (1) is
covered by the windshield member (3) K using a resin mesh, punching metal or the like. By the
way, although the wind noise can be reduced by the method of covering the entire microphone
(as shown in FIG. 1 and FIG. 2), the frequency characteristic and directivity characteristic are
deteriorated as shown by 31 WK and sound quality is deteriorated. There is. That is, in FIG. 3,
when the solid line is without the windshield (2) or (3) in FIG. 1 or FIG. 2, the broken line is with
the windshield (2) or (3) in FIG. 1 or FIG. Each represents a case. When the angle between the
sound source and the sound collecting surface of the microphone (1) is 06, that is, when the
sound source is positioned directly in front, the frequency characteristics when the windshield
(2) or (3) is absent are curve a1. However, the frequency characteristics when the windshield
members (2) or (3) are present are lowered in the low and high frequencies to 5 and the
sensitivity becomes worse as shown by curve 1 :. In this way, if the sensitivity decreases at low
and high frequencies and the mid frequency does not change relative to this-even if it seems to
be good as a whole, it is quite low frequency or high frequency In recent audio equipment that
can be played back, it has come to be understood that the above-mentioned reduction in the low
and high frequencies is unnatural sound. Further, even if the electronic device improves only the
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middle frequency, the harmony of the whole sound can not be achieved. On the other hand, when
the angle between the sound source and the sound collecting surface of the microphone (1) is
180 °, that is, when the sound source is located on the back side, the frequency characteristics
when the windshield (2) or (3) is absent are like curve 11bl. Also, the frequency characteristics
when the windshield members (2) or (3) are present increase in level as a whole by a curve 1ibz
and sensitivity is improved.
That is, since the level difference between the angles 0 @ and 1801 ′ ′ becomes smaller, the
directivity characteristic is degraded K. SUMMARY OF THE INVENTION In view of the foregoing,
it is an object of the present invention to provide a sound collection method and apparatus which
can obtain a good windshield effect without deteriorating frequency characteristics and
directivity characteristics and can also improve sound quality. An embodiment of the present
invention will be described in detail with reference to FIGS. 4 to 9 as follows: The present
invention is a perforated plate having a relatively low acoustic impedance as a windshield
member on the front of a microphone and having a large number of apertures. Are placed at a
predetermined interval, and thereafter, the sound from the sound source is picked up through
the plate-like body so as to be 5. FIGS. 4 to 7 show various examples of the through-hole platelike body according to the present invention disposed at a predetermined interval on the front
face of the microphone (1), and FIG. 4 shows the through-hole plate-like body. When a diskshaped punching metal (4) is used as a metal, FIG. 5 uses a rectangular metal mesh (5), and FIG.
6 uses a curved punching metal (6). Fig. 7 shows the case of using hemispherical wire mesh (7).
The through-hole-like plate-like body used in this way does not necessarily have to be a
thousand, and it may be composed of a curved surface. And, although it is necessary for the
perforated plate to be larger than the microphone unit, it is disposed on the front face with a
distance of, for example, 5 to 35, so as not to cover the microphone-phone. In addition, the hole
ratio of the plate-like plate is preferably 20 to 30 ×. The method of supporting the plate-like
plate is not shown, but for example, both side edges thereof are supported by being connected to
the microphone side by a frame or the like Alternatively, the plate-like body may be supported by
various methods depending on the situation, such as positioning on a dedicated stand. ａ！ FIG.
8 shows a configuration at the time of vocal sound collection in the case of using the perforated
plate-like body (8) according to the present invention such as the punching metal used in the
above-mentioned FIG. 4 to FIG. A front face K of a microphone (1) having a size 11 of, for
example, 54-, and a perforated plate-like body (8) having a length 12 of, for example, 70 to 100
in the length direction. For example, a distance D1 of 5 to 35 is disposed, and a sound source 9 is
disposed having a distance D2 of 505 from the microphone 1, and the sound from the sound
source 9 is transmitted through the plate-like plate Sound is collected from the microphone (1) k
through (8). In this case, it is preferable that the direction of the sound source (9) and the
direction of the air flow, etc. be the same with respect to the microphone (1). The result of sound
collection in this manner is shown in FIG. From FIG. 9, the frequency characteristic a1 in the
absence of the plate (8) and the frequency characteristic in the presence of the plate (8) at the
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angle 0'i / C indicate that the latter characteristic a3 has a frequency 3 It can be seen that both
are almost the same except that the level is slightly raised in the vicinity of 5 kHz, and that the
level does not decrease at the low and high frequencies as in the prior art.
Also, at the angle 1110 ', the frequency characteristic b1 when there is no plate-like body (8) and
the frequency characteristic b! When there is a plate-like body (8). Is substantially the same, and
therefore it can be seen that the directional characteristics do not deteriorate because the level
difference between the angles 0 @ and 180 @ is constant regardless of the presence or absence
of the plate-like body (8). The frequency characteristics and directivity characteristics can not be
degraded at all (like wind noise can be reduced, but what we want to pay attention to in this case
is that the frequency characteristic 13 of the frequency characteristics 13 at the abovementioned angle 0 @ is around 3 to 5 kHz) Level rise in the This is due to the diffraction effect
due to the size K of the plate-like body (8) used for the windshield, and the lifting can be changed
by changing the size of the plate-like body (8). About WIL :! ントｐ−ルできる。 A slight rise in
level near this frequency of 3 to 5 kHx can improve the timbre on the sense of hearing. In normal
sound collection work, the voice generated at the front of the microphone-phone is picked up
and superimposed on the sound of the instrument etc. picked up in the same manner as in the
case of [one voice and a part frequency of the sound of the musical instrument In the case of
human voice, etc., the gain in the vicinity of 3 to 5 kHg) may be improved, and the timbre on the
audibility may be improved. However, according to the present invention, since the frequency
gain of a portion considered to be important for sound quality, such as 3 to 5 kHx, can be picked
up beforehand and picked up at the time of sound collection. There is no need to lift the gain of a
particular frequency. As mentioned above, according to the invention! A through-hole-like platelike body is disposed at a predetermined interval on the front face of the icrophone, and the
sound from the sound source is picked up through this plate-like body, so that one frequency
characteristic and directivity characteristic are good without deterioration. A windshield effect
can be obtained. Also sound quality [11! Because you can pick up the specific frequency of the
part that seems to be strong depending on the nature of the sound source. Good sound quality 1
characteristics can always be obtained. In the above-described embodiment, the shape and type
of the through-hole plate-like body are not limited to the above-mentioned ones, and similar
shapes and types may be used if similar work effects can be obtained. . Also, it is not a single
plate. A woven fabric, a non-woven fabric, a urethane sheet or the like may be pasted thereon for
use.
[0002]
Brief description of the drawings
[0003]
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1 and 2 are each a block diagram showing an example of the conventional device, FIG. 3 is a
characteristic diagram for explaining the operation of FIGS. 1 and 2, and FIGS. 4vA to 7 are each
a diagram of the present invention. FIG. 8 is a block diagram showing a state at the time of
collecting vocals according to the present invention, and FIG. 9 is a characteristic chart for
explaining the operation of FIG. 8 w.
（１）はｉイクロホン、（４）、＋６１はノ（ンチングメタル。 (5), (7) are wire mesh, (8) is a
through-hole-like plate-like body, and (9) is a sound source.
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