Device and method for detecting high sound pressure-phase shifting characteristic of microphone

A technology of phase shift characteristics and detection device, applied in the direction of electrical components, etc., can solve the problems of nonlinear phase shift of the phase sensitivity of the microphone, and the inability to realize the phase calibration of the microphone, and achieve the effect of solving the calibration problem.

Active Publication Date: 2012-09-05
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the environment of high sound pressure level (above 140dB), if this method is used to calibrate the phase, it will cause the problem of nonlinear phase shift of the microphone phase sensitivity, and the microphone phase calibration cannot be realized.

Method used

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  • Device and method for detecting high sound pressure-phase shifting characteristic of microphone
  • Device and method for detecting high sound pressure-phase shifting characteristic of microphone
  • Device and method for detecting high sound pressure-phase shifting characteristic of microphone

Examples

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Embodiment 1

[0022] Such as figure 2 As shown, a detection device for high sound pressure-phase shift characteristics of a microphone according to the present invention includes an inverted "U"-shaped equal-phase coupling cavity 9, and the equal-phase coupling cavity 9 is fixedly connected with a through hole in the center Above the variable section reflective end cover 10; the inner diameter of the equal phase coupling cavity 9 is equal to the through hole inner diameter of the variable section reflective end cover 10, and the outer diameter of the equal phase coupling cavity 9 is 1 / 2 of the outer diameter of the variable section reflective end cover 10 ~1 / 3 times (for example: 1 / 2 times or 1 / 3 times). The top of the standing wave tube 11 is fixedly connected below the reflective end cover 10 with variable cross-section, and the bottom end of the standing wave tube 11 is fixedly connected with the bottom reflective end 13; 2 to 3 times (for example: 2 times or 3 times), the outer diamet...

Embodiment 2

[0027] Adopt the detection method of the detection device of the microphone high sound pressure-phase shift characteristic described in embodiment 1, it comprises the steps:

[0028] (a) by computer 5 control signal source 3 output setting frequency f, the sinusoidal signal of sound pressure amplitude P0, drive the loudspeaker 12 in the standing wave tube 11 by power amplifier 14 to send sound wave signal then; Setting frequency f is 500~ 800Hz (for example: 500Hz, 600Hz, 700Hz or 800Hz), and the sound pressure amplitude P0 is 1-2000Pa (for example: 1Pa, 100Pa, 1000Pa or 2000Pa).

[0029] (b) The loudspeaker 12 in the step (a) sends out the sound wave signal and is reflected repeatedly in the airtight space of variable section, forms the steady-state standing wave field, makes reference microphone 8 and the sound pressure amplitude and the phase that are felt by school microphone 1 both. Equal, and the sound pressure level reaches 94~160dB (for example: 94dB, 140dB, 150dB or 1...

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Abstract

The invention provides a device and a method for detecting a high sound pressure-phase shifting characteristic of a microphone. A variable-section closed space is formed by an equal-phase coupling cavity, a variable-section reflection end cover, a standing wave tube and a bottom reflection end cover; a loudspeaker in the standing wave tube is connected with a power amplifier; the power amplifier is connected with a signal source; the signal source is connected with a computer; a reference microphone and a calibrated microphone are respectively arranged on the side wall of the equal-phase coupling cavity and are connected with a signal amplifier; and the signal amplifier is connected with the computer. The method comprises the following steps of: controlling the signal source by the computer, and driving the loudspeaker in the standing wave tube to send a sound wave signal by the power amplifier; and performing cross-spectrum analysis on a signal which is acquired by the reference microphone and the calibrated microphone, so as to obtain a phase difference of the calibrated microphone relative to the reference sensor under a certain condition. A sound source has high sound pressure of 94 to 160 decibels according to a standing wave sound field theory, and the distortion degree is less than 1 percent; and therefore, the phase shifting characteristic of the phase sensitivity of the microphone is calibrated under a high sound pressure environment.

Description

technical field [0001] The invention relates to the technical field of acoustic measurement, in particular to a detection device and method for the high sound pressure-phase shift characteristic of a microphone. Background technique [0002] Microphone, also known as "acoustic-electric transducer", is a key sensor in acoustic testing. It is a conversion device that converts acoustic signals in the air into electrical signals. Its sensitivity has phase characteristics, which is usually called phase sensitivity. In recent years, with the continuous development of modern acoustic testing technology, new technologies such as acoustic holographic analysis, acoustic target positioning, acoustic fault analysis, and acoustic-vibration coupling analysis have emerged. These technologies require the use of the phase sensitivity of the microphone and are mainly used in noise sources. Acoustic tests such as positioning analysis, long-distance acoustic target recognition, engine noise fau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 杨晓伟闫磊朱刚刘鑫孙凤举
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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