Real-time voice signal receiving device based on self-mixing interference measuring method

A technology of self-mixing interferometry and measurement method, which is applied in the field of real-time voice signal pickup devices based on self-mixing interferometry, can solve the problems of no voice signal pickup device application, etc., to improve the ability to detect weak sound signals, low power consumption, Simple and compact structure

Inactive Publication Date: 2012-04-25
ANHUI UNIVERSITY
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Problems solved by technology

[0016] However, so far, the principle of laser self-mixing interference using semico

Method used

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  • Real-time voice signal receiving device based on self-mixing interference measuring method
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  • Real-time voice signal receiving device based on self-mixing interference measuring method

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Embodiment Construction

[0033] The real-time voice signal pick-up device based on self-mixing interferometry method has in the present embodiment:

[0034] A fixed cylindrical shell 1 forms a closed cavity inside; a sound membrane 3 is selected from materials with small volume, light weight, high sensitivity and excellent frequency response. The sound membrane 3 is located on the cross-section of the closed cavity of the cylindrical shell, The sound film 3 is supported on the positioning step 10 by the periphery, the positioning step 10 and the sound film 3 are on the coaxial position, and the positioning step 10 is fixedly arranged on the inner side wall of the cylindrical shell 1; with the photodetector 7, the signal processing unit 8. The drive and modulation unit 9 and the semiconductor laser 2 jointly constitute a signal sensing unit; wherein the semiconductor laser 2 is used to send an optical signal to the sound film 3 and receive a feedback optical signal from the sound film 3; the light emitt...

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Abstract

The invention discloses a real-time voice signal receiving device based on a self-mixing interference measuring method. The real-time voice signal receiving device is characterized by being provided with a cylindrical casing, a sound film and a semiconductor laser, wherein a closed cavity is formed inside the cylindrical casing; the cylindrical casing is fixedly connected with a measured object; the sound film is positioned on the cross section of the closed cavity of the cylindrical casing and is supported on a positioned step connected with the inner side wall of the cylindrical casing at the periphery; the semiconductor laser is fixedly arranged at the position coaxial with the sound film in the closed cavity of the cylindrical casing by a rigid bracket; the semiconductor laser is used for transmitting an optical signal to the sound film and receiving a feedback optical signal from the sound film; a photoelectric detector is used as a photoelectric signal conversion unit; and a signal processing unit is used for receiving an output signal of the photoelectric detector and outputting a sound detection signal. According to the real-time voice signal receiving device disclosed by the invention, the sound signal is sensed by using the self-mixing effect of the semiconductor laser, electromagnetic interference is avoided and an outside sound signal can be received at high sensitivity and high precision and in wide range.

Description

technical field [0001] The invention relates to an optical detection method for acousto-optic conversion and acoustic vibration, in particular to an optical real-time voice signal pickup device. Background technique [0002] Existing real-time voice signal pickup products include microphones, hearing aids, intercom systems, etc. The principle of the voice signal pickup is an energy conversion device that converts a sound signal into an electrical signal and then converts it back into a sound signal. [0003] Take the microphone as an example to illustrate the principle of voice signal pickup products. At present, traditional electric microphones are generally divided into dynamic microphones and electret microphones. In the dynamic microphone, the external sound passes through the air to vibrate the diaphragm, and then the coil winding on the diaphragm and the magnet surrounding the dynamic microphone head form a magnetic field cutting to form a weak current. The working p...

Claims

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Application Information

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IPC IPC(8): H04R23/02
Inventor 吕亮俞本立曹志刚张道信朱军杨竟宇翟龙华赵云鹤杜正婷
Owner ANHUI UNIVERSITY
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