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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.

Inactive Publication Date: 2020-01-10
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acoustic calibrator is usually used to calibrate the microphone during use, which has the disadvantages of manual operation, cumbersome process, low calibration efficiency, and increased noise detection workload. Especially for multi-channel online monitoring noise measurement devices, acoustic calibrator Calibration methods are basically not practical

Method used

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

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Embodiment Construction

[0023] Such as figure 1 with figure 2 As shown, the microphone with self-calibration function in this embodiment includes a microphone body 1 and a self-calibration unit 2 installed on the microphone body 1, and the self-calibration unit 2 includes a second housing 21 and a self-calibration film installed on the housing 21 Sheet 22, the self-calibrating diaphragm 22 and the sound transmission diaphragm 11 of the microphone body 1 are arranged in a gap to form a capacitor, and the second housing 21 has an excitation electrode input terminal for inputting an AC excitation voltage to the self-calibrating diaphragm 22 . Among them, the self-calibration diaphragm 22 is used to apply the AC excitation voltage from the AC excitation power supply, and constitutes two plates of capacitance with the sound transmission diaphragm 11. Since the sound transmission diaphragm 11 is grounded, the self-calibration diaphragm is activated by the above-mentioned voltage signal. 22 and the sound-...

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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.

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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Application Information

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IPC IPC(8): H04R29/00
CPCH04R29/004
Inventor 吴晓文卢铃曹浩彭继文吕建红
Owner STATE GRID HUNAN ELECTRIC POWER
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