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Description 1, title of the invention
MC type underwater microphone test signal input circuit
3. Detailed Description of the Invention The present invention relates to a test signal input circuit
of an MC type underwater microphone which detects underwater information and converts it
into an electrical signal. In underwater acoustic equipment equipped with an MC-type
underwater microphone, it will be necessary to input an equivalent signal to the MC-type
underwater microphone and perform an input-output test in adjustment and inspection after
general assembly. Water-tight, built-in signal input terminals are provided in the MC type
submersible micro-hoi. However, such a method is complicated in construction and expensive. In
addition, there is a drawback that the external noise is picked up and the SA ratio becomes
worse. In addition, it is also possible to disconnect the MC type underwater microphone output
and provide a signal input terminal, but this method requires a switch, a connector, a wire, a wire,
etc., and in some cases it must be a watertight structure. In addition, there is a disadvantage of
reduced reliability and high cost. The present invention has been made in view of the abovementioned problems, and it is possible to attenuate or zero the MC type underwater microphone
output due to external noise without disconnecting the MC type underwater microphone output,
and further, the watertight structure signal input terminal is not required. It is an object of the
present invention to provide an MC type underwater microphone test signal input circuit which
can reduce costs and improve reliability. An embodiment of the present invention will be
described below with reference to the drawings. FIG. 1 is a circuit diagram showing an
embodiment of the present invention. In this figure, reference numeral 1 denotes an MC-type
underwater microphone having an MC-type sensor 2. 3 and 4 MC-type water EndPage: 1
Procedure amendment January 29, 1959, 1 + J 'Former Secretary of the Government, Mr.
Yoshitani Kumagai 1, Display of the case Patent application for patent application No. 59 IS. No.
556 2 Title of the Invention 2 Title of the Invention MO Type Underwater Microphone Test
Signal Input (2) Path 3 Related Person with Correction Case Patent Applicant (Offi 9) Oki Electric
Industry Co., Ltd. 4, Agent 〒 105 Tokyo Minato Ward Toranomon-Chome 2nd No. 20 No. Moribi
p Attorney Hiroshi Kikuchi 1: 1, Ko'l 'No. 6568 Telephone 559-3065-50 1-2i 63'-5, 111i positive
order of oral administration Showa Voluntary) (2) Correct the Figure 1 as per attached sheet.
Figure 1 EndPage: 3 Warning: Page Discontinuity 2 pages dropped