Device and method for testing sensitivity and frequency response curve of microphone

A technology of frequency response curve and testing device, which is applied in the direction of electrical components, etc., to achieve the effect of convenient operation, high testing accuracy and easy realization

Inactive Publication Date: 2016-04-20
BRILLIANCE AUTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a microphone sensitivity and frequency response curve test device and method, which solves many problems encountered in the microphone characteristic parameter test of the traditional structure and method, and its test accuracy is high, easy to implement, and convenient to operate

Method used

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  • Device and method for testing sensitivity and frequency response curve of microphone
  • Device and method for testing sensitivity and frequency response curve of microphone
  • Device and method for testing sensitivity and frequency response curve of microphone

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Experimental program
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Embodiment 1

[0027] The microphone sensitivity and frequency response curve testing device of the present embodiment, such as Figure 1-6 As shown, one end of the microphone 7 to be tested is plugged in the acoustic coupling chamber unit 6, and the other end is connected to the input end of the analog / digital conversion board 2; the output end of the acoustic coupling chamber unit 6 is connected to the input of the analog / digital conversion board 2 end; the output end of the analog / digital conversion board 2 is connected to the input end of the computer signal processing unit 1; the output end of the computer signal processing unit 1 is respectively connected to the input end of the computer signal control unit 5 and the digital / analog conversion board 3; the computer signal control The output end of the unit 5 is respectively connected to the input end of the digital / analog conversion board 3 and the gain amplifier 4; the output end of the digital / analog conversion board 3 is connected to ...

Embodiment 2

[0047] The difference between the microphone sensitivity and frequency response curve testing device in this embodiment and Embodiment 1 is that the frequency selector 605 is not used in the acoustic coupling cavity unit 6, and the computer signal processing unit 1 directly selects a suitable speaker according to the frequency of the test sound source . Although the frequency selector 605 has a simple structure, the coils and capacitors consume sound energy in their respective frequency bands, which distorts the test sound source. In this embodiment, a computer is used to control the work of the loudspeaker, which can make the test result more accurate.

Embodiment 3

[0049] The difference between the microphone sensitivity and frequency response curve testing device in this embodiment and Embodiment 1 is that in order to ensure the accuracy and consistency of the test results, the temperature, humidity, and atmospheric pressure levels of the test environment should be kept stable, and there should be no electromagnetic interference around and Background noise should be less than 36 decibels.

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Abstract

The invention discloses a device and method for testing the sensitivity and frequency response curve of a microphone, and relates to the field of performance testing and evaluation of acoustic measurement instruments. The device comprises a computer which is provided with a built-in signal processing unit and a built-in signal control unit. The device also comprises an analog/digital conversion board, a digital/analog conversion board, a gain amplifier, and a sound coupling cavity unit. The method comprise the steps: firstly generating sound source signals, needed by testing, with various frequencies through employing the computer, and adjusting the gain amplitudes of the signals, so as to generate a standard testing sound source; secondly comparing the response levels of a to-be-tested microphone and a reference microphone according to the frequency response curve of the reference microphone, and calculating the sensitivity and frequency response curve of the to-be-tested microphone. The method does not need an electrician to carry out testing, just needs to operate the computer for achieving all functions, is easy to implement, is convenient to operate, is high in testing precision, fills a gap in the field of microphone performance testing, and can be widely used for the acoustic measurement in a plurality of fields.

Description

technical field [0001] The invention relates to the field of performance evaluation of acoustic measuring instruments, in particular to a device and method for testing the sensitivity and frequency response curve of a microphone. Background technique [0002] With the development of society and the improvement of living standards, people have more and more strict requirements on the noise level of traffic environment, household appliances and living environment. As the first step and prerequisite for reasonable improvement and control of noise, objective and accurate measurement of noise characteristics is required. At present, there are many noise measurement methods, such as sound pressure measurement, sound intensity measurement, sound power measurement, etc.; there are also many equipment used, such as sound intensity meter, acoustic camera, artificial head, etc. In these methods and devices, microphones are required without exception. [0003] Accurate microphone perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 徐勇王晖王洋周立廷
Owner BRILLIANCE AUTO
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