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JPH09284881

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DESCRIPTION JPH09284881
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound collection control apparatus using directional microphones, and more particularly to a
sound collection control apparatus enabling remote focusing of directional microphones.
[0002]
2. Description of the Related Art Conventionally, when focusing a directional microphone
(maximum point of directivity sensitivity), focusing has been performed visually from the back
side of a parabolic acoustic reflector. FIG. 4 is a schematic view of a conventional apparatus. The
directional microphone comprises a microphone body 41 and a parabolic acoustic reflector 42.
43 is a sighting instrument, 44 is a tripod, 45 is a sound collector, and 46 is a viewing window.
When the directional microphone is focused on the sound source (target), the observation
window 46 is viewed from the back side of the reflecting plate 42, and the tripod 44 is adjusted
so that the target T and the sighting device 43 are aligned.
[0003]
FIG. 3 is a diagram showing the directivity characteristics of the attenuation level with respect to
the angle of the reflection plate 42. As shown in FIG. As shown in the figure, the sensitivity is
maximized when the reflecting plate 42 faces the target T, that is, when the angle is 0 degree,
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and the sensitivity is attenuated as the angle is deviated from the angle 0 degree. The directional
characteristics change with the source frequency, but the basic characteristics show the same
tendency as in FIG.
[0004]
In the above-described conventional apparatus, when the target T is changed, it is necessary for a
person to go to the back of the parabolic reflector 42 and carry out the adjustment work each
time. Also, when the parabolic reflector 42 is moved due to an external factor or the target T is
moved, the above variation is applied unless the target T is observed from the back of the
parabolic reflector 42 through the viewing window 46. It was difficult to judge. Furthermore,
when the parabolic reflector 42 is attached to the traverse device and measurement is performed
in an arbitrary space, it is difficult for a person to perform adjustment work from the back of the
directional microphone, and therefore the directional microphone is made to face the target It
was very difficult.
[0005]
An object of the present invention is to provide a sound collection control device capable of
causing a directional microphone to face the target by remote control even if a person does not
perform adjustment work from the back of the directional microphone.
[0006]
According to the present invention, there is provided a sound collection control device
comprising: a directional microphone for collecting sound from a target; a camera for imaging
the target in conjunction with the directional microphone; The camera has displacement control
means for displacing the microphone together with the camera, and display means for displaying
an image captured by the camera and providing an index for aligning the position with the target.
[0007]
The displacement of the directional microphone can be adjusted by remote control while looking
at the image captured by the camera.
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Since the indicator is provided with the display means, the adjustment operation can be
performed easily and accurately.
[0008]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing a sound collection
control apparatus according to an embodiment of the present invention.
The reference numeral 11 denotes a microphone main body, and the reference numeral 12
denotes a parabolic acoustic reflector, which constitute a directional microphone, and collects
sound generated from a target T (sound source). The configuration of the directional microphone
itself is basically the same as that of the conventional one.
[0009]
A small camera 13 is attached to the target T side of the microphone body 11, and the target T is
imaged by the small camera 13. The directional microphone is attached to the motorized
platform 14 and can be turned and vertically driven by the remote controller 15 so that the
target T can be identified.
[0010]
The motorized camera platform 14 is attached to a traverse device 16 movable in the X, Y and Z
directions, and the traverse device 16 spatially moves the directional microphone and the small
camera 13 via the motorized camera platform 14. A monitor 17 is connected to the small camera
13, and an image captured by the small camera 13 is displayed on the screen 18 of the monitor
17. A cross line plate 19 is connected to the monitor 17.
[0011]
Next, the operation of the apparatus shown in FIG. 1 will be described. First, the directional
microphone or the like is moved to a desired space (position) by the traverse device 16. Then, the
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motorized platform 14 is adjusted remotely by the remote controller 15 so that the target T is
displayed on the screen of the monitor 17.
[0012]
Cross lines are aligned on the screen 18 of the monitor 17 via the cross line plate 19, and as
shown in FIG. 2, the focus of the directional microphone is matched to the target T by matching
the cross line 18 a to the target T. . As described above, when the cross line 18a matches the
target T, the directional microphone and the target T face each other, and the sensitivity of the
directional microphone is maximized.
[0013]
As described above, in the present apparatus, the directional microphone (the microphone body
11 and the parabolic acoustic reflector 12) is displaced in conjunction with the small camera 13
by the remote controller 15 while monitoring with the monitor 17. Make the focus match the
target T. Therefore, the directional microphone can be made to face the target by remote control,
even if a person does not perform adjustment work from the back of the directional microphone
as in the prior art.
[0014]
According to the present invention, since the displacement control means for displacing the
directional microphone together with the camera is provided and the display means for
displaying the image picked up by the camera is provided, the directional microphone can be
controlled by remote control while viewing the image. It is possible to adjust the displacement.
Further, since the display means is provided with an index for aligning with the target, it is
possible to carry out the adjustment operation easily and accurately.
[0015]
Brief description of the drawings
[0016]
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1 is an explanatory view showing an embodiment of the present invention.
[0017]
2 is an explanatory view showing a part of FIG.
[0018]
3 is a diagram showing the directional characteristics of the attenuation level with respect to the
angle of the parabolic acoustic reflector.
[0019]
4 is an explanatory view showing the prior art.
[0020]
Explanation of sign
[0021]
11 Microphone Body (Directive Microphone) 12 Parabola Type Acoustic Reflector (Directive
Microphone) 13 Camera 14 Electric Camera Pan (Displacement Control Means) 15 Remote
Controller (Displacement Control Means) 17 Monitor (Display Means) 18a Cross Line (Index)
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