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

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...

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Problems solved by technology

[0016] However, so far, the principle of laser self-mixing interference using semiconductor lasers as light sources has not been applied in voice signal pickup devices.

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