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JPH02291800

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DESCRIPTION JPH02291800
[0001]
FIELD OF THE INVENTION The present invention relates to an effective and directivity changing
audio input device for reproducing a high fidelity sound field. [Prior Art] A conventional
microphone input device has two or more omnidirectional, unidirectional, or microphone units,
and electrically processes the mutual phase difference to obtain directivity. There were nearly
three types of input devices, such as being superdirective. However, the conventional apparatus
only has a type that processes the phase even if the directivity is changed, and is a type in which
the omnidirectional microphone is made to have directivity by a parabolic collector. [Problems to
be Solved by the Invention] However, in the conventional input device as described above,
electrical phase difference etc. are processed in order to continuously change directivity from
omnidirectionality to unidirectionality. Or the parabola shape of the large parabola-type sound
collector had to be greatly changed. Furthermore, when the directivity is continuously enhanced
from non-directivity, the system mechanically becomes a large system, and electrically, the circuit
becomes complicated. The present invention has been made to solve such conventional
problems, and it is an audio input device that can continuously change from unidirectionality or
nondirectionality to directionality with a simple configuration. The purpose is to provide. [Means
for Solving the Problems] In order to achieve the above object, the audio input device of the
present invention comprises a microphone and an acoustic reflector for determining an input
directivity in a vertical direction with respect to a diaphragm of the microphone. An audio input
device provided opposite to the diaphragm, wherein the acoustic reflector has a conical shape or
a shape close to it, and either the microphone or the sound reflector is movable. is there.
[Operation] According to the audio input device of the present invention, it is possible to
continuously change the position of the acoustic reflector from the center of the microphone to
the outside, and as a result, from the nondirectionality, for example, as in the unidirectionality.
Continuous changes can be made in an easy way. Example FIG. 1 (a). (B) is a side view and a
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bottom view schematically showing the main configuration of the audio input device according to
an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are side views showing another
embodiment of the present invention It is a figure and a bottom view. Also, FIG. 3 (a). (B) has
shown the top view in the case of having directivity in the Example of FIG. 1, the side view, and
FIG. 4 (a). (B) is a plan view and a side view in the case of having directivity in the embodiment of
FIG. 2, and (c) shows directivity to the device of (a) and (b) of the same. Is a block diagram of a
drive circuit for moving the motor.
In FIGS. 1 to 4, “lot” is a microphone body, 102 is a vertex of an acoustic reflector (audio
mirror), 103 is a microphone unit, 104 is a frame for supporting the acoustic reflector 105, 105
is an acoustic reflector, 301 is an acoustic reflector. A nondirectional curve is shown, and 401
represents a unidirectional curve. In FIG. 1 (a), by matching the apex 102 of the acoustic reflector
with the center of the microphone unit 103, a directivity curve 301 as shown in FIG. 3 (a), that is,
a planar omnidirectional microphone system It becomes. Also, by moving the microphone unit
103 from point A to point B as shown in FIG. 2 (a) by means to be described later, the directional
characteristics are sequentially changed from non-directionality to unidirectionality. It can be
done. This can be shifted from omnidirectionality to unidirectionality by shifting the position of
the microphone unit 103 from the center of the acoustic reflector 105. That is, by continuously
moving the position of the microphone unit 103 from the point A to the point B shown in FIG.
2A, the directivity can be changed continuously and continuously. That is, when the microphone
unit 103 is moved to the point B by means to be described later, it becomes a unidirectional
microphone such as the curve 401 shown in FIG. 4 (a). As means for moving the microphone unit
103, as shown in FIG. 2A, the rack gear 108 is fixed to the microphone body 101, and the gear
106 is engaged with the rack gear 10B. Then, the microphone unit 103 can be moved by moving
the microphone unit base 109 which is the base of the microphone unit 103 to the point A モ ー
タ B by the motor 107 pressing the gear 106. Further, as a drive circuit for moving the
microphone unit 103, there is a circuit shown in FIG. 4 (C). According to this circuit, the motor
control circuit 404 connected to the power supply 403 is operated to switch the directivity
operation unit 402. Thus, the adjustment ratio is changed to move the motor 107 and move the
microphone unit 103 to the point AMB. [Effects of the Invention] As described above, the audio
input device δ of the present invention uses a conical or near acoustic reflector, and further
moves the position of the microphone relative to the acoustic reflector. The directivity can be
changed continuously from nondirectionality to unidirectionality easily with a small number of
parts.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 (a). (B) is a side view and a bottom view showing an outline of the main configuration in
the audio input device of one embodiment of the present invention, FIG. 2 (a). (B) is a side view
and a bottom view showing another embodiment of the present invention, FIG. 3 (a). (B) is a plan
view, side view in the case of having directivity in the embodiment of FIG. 1, FIG. 4 (a), (b) is a
plan view in the case of having directivity in the embodiment of FIG. Side view, FIG. 4 (c) is the
same figure (a). It is a block diagram of the drive circuit which moves a motor in order to give
directivity with respect to the apparatus of (b).
In the figure. 101: 1 02: 103 1 04: 1 05 = 1 06 = 1 07 = 1 08: apex of microphone body acoustic
reflector microphone unit frame acoustic reflector gear motor rack gap (a) (b) Fig. L09:
microphone Unit base 301: omnidirectional curve 401: unidirectional directivity curve 402.
Directional operation unit 403: power supply 404: motor control unit
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