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A Nonlinear Corrected Microphone

A nonlinear correction, microphone technology, applied in electrostatic transducer microphones, instruments, measurement of ultrasonic/sonic/infrasonic waves, etc., can solve the nonlinearity of condenser microphones, detection of sound pressure nonlinearity, large dynamic range nonlinearity and other problems , to expand the detection pressure range, eliminate zero drift, and achieve the effect of high sensitivity

Active Publication Date: 2021-03-05
中国人民解放军军事科学院防化研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the large dynamic range nonlinear problem of the existing condenser microphone, provide a microphone with nonlinear correction, and solve the nonlinear problem that occurs when the existing condenser microphone detects loud pressure
[0006] The present invention solves the non-linear problem of the existing condenser microphone and adopts the following technical solutions:

Method used

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  • A Nonlinear Corrected Microphone
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  • A Nonlinear Corrected Microphone

Examples

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Embodiment 1

[0033] A non-linearly corrected microphone such as figure 1 As shown, it includes a sensitive film 1, a high-sound pressure output pole 2, a high-sensitivity output pole 3, an amplifier circuit board 4, a base body 5, a shielding cavity 6, a low-sensitivity rear plate 7, and a high-sensitivity rear plate 8. The sensitive film 1 is installed on the base body 5, the amplifying circuit board 4 is fixed in the base body 5, the base body 5 is installed in the shielding cavity 6, and the high sound pressure output pole 2 and the high-sensitivity output poles 3 are installed on the amplifying circuit board 4 respectively. The high-sound pressure output pole 2 is electrically connected to the low-sensitivity rear plate 7 , and the high-sensitivity output pole 3 is electrically connected to the high-sensitivity rear plate 8 .

[0034] The sensitivity curve of the low-voltage high-sensitivity condenser microphone warps upward as the positive pressure increases, and curves downward as t...

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Abstract

The invention relates to a nonlinear correction microphone. The nonlinear correction microphone comprises a sensitive film, a base main body, a low-sensitivity rear polar plate, a high-sensitivity rear polar plate, a shielding cavity, a high-sound-pressure output electrode, a high-sensitivity output electrode and an amplification circuit board. A capacitor microphone with high sound pressure and low sensitivity and a capacitor microphone with low sound pressure and high sensitivity are compounded together, the same sound pressure is detected, the two capacitors share one diaphragm; the small area of the center of the rear pole plate is the rear pole of the high-sound-pressure capacitor microphone; the large area of the periphery of the rear pole plate is the rear pole of the low-sound-pressure condenser microphone, the output of the low-sound-pressure condenser microphone is approximately linear, the output of the high-sensitivity condenser microphone is nonlinear, and the output of the high-sensitivity condenser microphone is corrected by using the output signal of the high-voltage condenser microphone in the amplifier.

Description

technical field [0001] The invention relates to a non-linearly corrected microphone, which belongs to the technical field of microphones and is used in the field of sound wave (including subsonic wave) sensing. Background technique [0002] The microphone is used in the field of infrasound sound transmission detection with a large dynamic range (0.01Pa-20kPa). From the energy conversion mode, the existing infrasound microphones mainly include piezoelectric, capacitive and electric types. The microphone of the present invention The capacitive microphone is adopted, and the capacitive microphone has the characteristics of high sensitivity, wide and flat frequency response, and good stability. The detection range of the existing capacitive microphone is small, and the maximum is several hundred Pa. There is a non-linear problem of sound pressure detection. The principle is: the change of capacitance distance caused by sound pressure exceeds a certain ratio, and the sensitivity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R19/04G01H11/06
CPCG01H11/06H04R19/04
Inventor 庞新良程远李英男常芸芬程先友李军刘伟李欣邢斌张雪芹李鹏王尊刚刘欣宁王师
Owner 中国人民解放军军事科学院防化研究院
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