JPS52133206

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DESCRIPTION JPS52133206
The present invention is characterized by comprising: two microphones arranged in different
directions, fixing means for fixing the microphones, and amplification means for differentially
amplifying the outputs of the microphones. Differential microphone. 3 is a detailed explanation
of Ming. Traditional. . As this type of differential microphone, although it is known to provide a
differential effect at the sound pressure stage, it is expensive because it is structurally complex,
and it is a large output against vibration. Has the disadvantage of producing . The present
invention provides a differential microphone that is inexpensive and difficult to output with
respect to vibration by fixing two microphones by a member similar to a rigid body, and
differentially amplifying the outputs of these microphones with a differential amplifier. It is a
thing. The figure shows an embodiment of a differential microphone according to the invention,
1 being a cylinder similar to a rigid body, 2 and 3 microphones arranged in the cylinder 1 and 4
a differential amplifier. Then, the microphones 2 and 3 are arranged such that the 18σ
directions are different toward the open part of the cylinder 1, and the outputs of these
microphones 2 and 3 are applied to the differential amplifier 4 where they are differentially
amplified. Ru. As described above, according to the present invention, since the differential effect
is provided by the electric circuit including the differential amplifier 4, it is possible to fix the two
microphones 2 and 3 in order to make the apparatus extremely inexpensive. Therefore, it has the
feature that it is difficult to output an output against vibration. In the above-described
embodiment, a cylinder is used to fix the microphone, but the present invention is not limited
thereto, and various shapes can be used. As described above, according to the present invention,
a differential microphone whose output is less likely to be output due to vibration is obtained by
fixing two EndPage: 1 microphones and amplifying the output by a differential amplifier. You can
get
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of one embodiment of a
differential microphone according to the present invention. 1 is a cylinder, 2.3 is a microphone,
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and 4 is a differential amplifier. Agent Shinno-EndPage: 2
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