Microphone with self-calibration function, calibration method thereof, sound transmission system and sound detection system

A self-calibration and microphone technology, applied in electrical components and other directions, can solve the problems of low calibration efficiency, cumbersome process, and unrealistic feasibility, and achieve the effect of reducing calibration workload and ensuring accuracy.
CN110677798AInactive Publication Date: 2020-01-10STATE GRID HUNAN ELECTRIC POWER +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
STATE GRID HUNAN ELECTRIC POWER
Publication Date
2020-01-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a microphone with a self-calibration function, a calibration method thereof, a sound transmission system and a sound detection system. The microphone comprises a microphone body and a self-calibration unit installed on the microphone body. The self-calibration unit comprises a second shell and a self-calibration diaphragm mounted on the shell, the self-calibration diaphragmand a sound transmission diaphragm of the microphone body are arranged at an interval to form a capacitor, and the second shell is provided with an excitation electrode input terminal used for inputting alternating-current excitation voltage to the self-calibration diaphragm; the sound transmission system and the sound detection system comprise the microphone. The calibration method comprises thestep of recording a voltage effective value U2 between the sound transmission diaphragm and the back polar plate as the sensitivity of the microphone when the voltage effective value of the alternating-current excitation power supply is U1. The method does not need to manually calibrate the microphone, is suitable for an acoustic online monitoring device, can greatly reduce the workload of noisedetection personnel, improves the noise detection efficiency and precision, and is convenient and quick in calibration.
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Description

technical field

[0001] The invention relates to noise detection technology, in particular to a microphone with self-calibration function and its calibration method, sound transmission system and sound detection system. Background technique

[0002] The microphone uses the sound transmission diaphragm to detect the air vibration caused by the sound wave, converts the sound wave signal into an electrical signal, and then calculates the noise value through acquisition and weighting network. Since the temperature, humidity, and air pressure of the air may change at any time, which will affect the vibration response of the sound transmission diaphragm and change the sensitivity of the microphone. Therefore, in order to ensure the accuracy of noise measurement results, portable noise measurement equipment such as sound level meters and noise The prepolarized electret microphones used in online monitoring equipment need to be calibrated during use. Acoustic calibrator is usually u...

Claims

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