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JPS54107724

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DESCRIPTION JPS54107724
Description 1, title of the invention
Microphone device
3. Detailed Description of the Invention The present invention relates to, for example, a MS type
microphone device, and more particularly to a device for indicating the direction of composite
directivity. As is well known, for example, two microphones having different directivity patterns
are accommodated in one microphone unit, and control is performed by a matrix circuit using a
phase difference due to the directivity patterns of each microphone. A one-point-type
microphone device having two directivity directions that radially spread can be configured. Such
a microphone device is usually referred to as a corridor type in the case of stereo, and a stereo
signal can be obtained with only one microphone unit. By the way, since the microphone type as
described above changes the level of one of the two microphones, the directivity pattern of the
microphone changes, so that the radiation angle of the directivity of the microphone as a whole It
is possible to change the direction of cast synthesis directivity. Therefore, if the level of one of
the microphones is intentionally varied and the directivity direction of the microphone device can
be recognized immediately, the directivity of the microphone device can be made the desired
direction, which is extremely convenient in practice. In the prior art, such microphone devices
have been strongly demanded. According to the present invention, an indication mechanism is
provided to indicate the direction of combined directivity in conjunction with the level
adjustment operator that changes the output level of each microphone at EndPage: 1 represented
in consideration of the above circumstances. It is an object of the present invention to provide a
very good microphone device which can change directivity in a desired direction. Hereinafter, an
embodiment of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 11 denotes a first microphone having unidirectionality, and an
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acoustic signal received from the sound receiving unit 11 is supplied to one input end of a matrix
circuit 12. Further, a bi-directional second microphone 13 having a sound receiving portion 131
° 132 substantially orthogonal to the sound receiving portion 111 is provided at the rear of the
first microphone 11. An acoustic signal received by the second microphone 13 is supplied to the
other input end of the matrix circuit 12 via the variable resistor R. The output end of the matrix
circuit 12 is, for example, a stereo reproduction apparatus (not shown) via the right channel and
the left channel output terminal 44rl / i, and the variable resistor R is provided with the indicator
shown in FIG. In FIG. 2, 21.22 is a side-shaped indication member which is installed opposite to
each other and is rotatably supported at its corner.
The pointers 23 and 24 are provided at one end of the pointing member 21.22, and the
engagement pin 25.26 is provided at the other end. And holding pin 25.26 of said pointing
member 21.22 is fitted in long hole 28.29 provided in the part extended in the horizontal
direction in the front T-shaped movable member 270 figure. Further, the base 271 of the
movable member 27 is provided with a level adjusting operator 30, and the operator 3o can slide
freely in a long hole 32 formed in a resistance member 31 installed parallel to the base 21 '. It is
fitted. The operator 3 o and the resistance member 31 constitute the variable resistor R. When
the pointer 23.24 is incorporated in a microphone (described later) II, it is positioned at a
position corresponding to a display window 83 indicated by a two-dot chain line in the drawing.
FIG. 3 shows an embodiment in which the first and second micropons 11.13 and the pointing
mechanism 1 and the like are accommodated in the microphone device If. The operation of the
microphone device having the above-described configuration is completely read. First, assume
that the directivity pattern of the first microphone 11 is as shown by a solid line in FIG. Here, in
FIG. 4, the perpendicular to the sound receiving portion 111 of the first microphone 11 is taken
as the vertical axis, and this is taken as 00. Then, it is assumed that the operator 30 is set at an
appropriate position, and the directivity pattern of the second microphone 13 controlled by the
resistance value of the hair resistance R at this time is as shown by a dotted line 1 in FIG. . Then,
the combined directivity direction of the first and second microphones 11.1B is the direction
shown by the arrow ω in FIG. Then, the composite directivity direction (arrow (A)) at this time
and the direction indicated by the pointer 23.24 are the same. When the operator 3o is slid in
the direction indicated by the arrow (a) in FIG. 2 in the above state, the level of the second micro
pong 13 changes with the change of the resistance value of the variable resistor (R) Suppose that
the directivity pattern is shrunk as shown in FIG. 4 (11) → 11). Then, the direction of combined
directivity of the first microphone 11 and the second micropong 13 changes as shown by an
arrow ω) → (C) in FIG. At the same time, when the operator 3 ° is slid in the direction indicated
by the arrow (a), the movable member 27 also moves in the same direction, and the holding pins
25 and 26 of the indication members 21 and 22 move the long hole 28. Slide away from each
other in 29. For this reason, the pointing members 21 and 22 rotate in the directions indicated
by the arrow (c), and the hands 23.24 first converge in the order of arrows (B) and (C) in FIG. In
the same direction, the synthetic directivity direction is indicated corresponding to.
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When the operator 3o is slid in the direction indicated by the arrow (b), the combined directivity
direction is arrow (C) → (B) → (A), and at the same time, the pointer 23.24 is also arrow (d) )
Turn in the direction indicated by EndPage: 2 to indicate the combined directivity direction.
However, since the combined directivity direction can be recognized by the hands 23.24, the
directivity of the microphone device can be set to a desired direction. Further, since the operating
element 30 is only slid, handling is easy and the pointing mechanism I is also very simple as
shown in FIG. The present invention is not limited to the above embodiment. For example, either
of the first and second microphones may change the output level. Besides, the present invention
can be modified and implemented without departing from the scope of the invention. Therefore,
as described in detail above, according to the present invention, the pointing mechanism is
provided to indicate the direction of the combined directivity in conjunction with the level
adjusting operator which varies the output level of each microphone, so that the directivity is
desired. It is possible to provide a very good microphone device that can be changed in direction.
4. Brief description of the drawings. FIG. 1 is a block diagram showing an embodiment of the
microphone device according to the present invention, FIG. 2 is an enlarged structural view
showing an essential part of the embodiment, and FIG. FIG. 4 is a pattern diagram showing the
directivity of the first and second microphones. 1 first microphone 12 12 matrix circuit 13
second micro pong R variable resistance instruction * structure n: micro pong unit 21.22:
indication member, 23.24, pointer, 25.26, engagement pin, 27: movable member, 28.29,
elongated hole, SO, operator 31 ... resistance member, 32 ... long hole, 33 ... display window.
Applicants Attorney Attorney Takehiko Suzue − 179-179-5 ′ ′ End EndPage 6: 3
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