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Speech detecting system based on laser Doppler interference

A voice detection and laser technology, which is applied in voice analysis, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc. It can solve the problem of low vibration signal, phase-locked demodulation technology cannot be applied to voice detection, and low signal-to-noise ratio of voice signals, etc. problem, to achieve the effects of small nonlinear error, good environmental adaptability, and improved signal-to-noise ratio

Inactive Publication Date: 2012-07-11
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In practical application scenarios, since the vibration signal caused by voice is very low, even far lower than the environmental disturbance signal, the signal-to-noise ratio of the voice signal demodulated by frequency demodulation technology and phase demodulation technology is very low, while The existing phase-locked demodulation technology cannot be applied to speech detection

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  • Speech detecting system based on laser Doppler interference
  • Speech detecting system based on laser Doppler interference
  • Speech detecting system based on laser Doppler interference

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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. While illustrations of parameters including particular values ​​may be provided herein, it should be understood that parameters need not be exactly equal to the corresponding values, but rather may approximate the values ​​within acceptable error margins or design constraints.

[0018] In the present invention, in order to reduce the impact of environmental disturbances, the M_Z interferometer structure is used to design the optical path, and the low-frequency signal to be measured is used to modulate the high-frequency signal to realize spectrum shifting, thereby isolating the signal to be measured from the low-frequency environmental disturbance (less than 200 Hz) , and use the quadrature phase-locked demodulation technolo...

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Abstract

The invention discloses a speech detecting system. The speech detecting system is designed based on the Doppler interference of an M_Z interferometer, the optical frequency modulation is achieved through an acousto-optic modulation, so that speech signals to be tested and low frequency environment disturbance signals are separated, and then demodulation output of the speech signals are achieved by means of an orthogonal phase lock demodulation method. The speech detecting system has the advantages of being simple in optical structure and small in nonlinear errors.

Description

technical field [0001] The invention relates to the technical field of audio detection in the optical industry, in particular to a voice detection system based on laser Doppler interference. Background technique [0002] Laser Doppler voice detection technology is derived from the traditional laser Doppler vibration measurement technology. Laser Doppler vibration measurement technology can be divided into two methods: homodyne interferometry and heterodyne interferometry. The homodyne interferometry adopts the Michelson interferometer structure, and the optical path structure is simple, but it is easily affected by environmental disturbances and is not suitable for actual work situations; the heterodyne interferometry generally adopts the Mach-Zehnder (M-Z) interferometer structure or dual-frequency lasers structure, this method can effectively avoid the impact of environmental disturbances and improve the anti-interference ability of the system. [0003] The heterodyne de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G10L11/02G10L25/78
Inventor 曾华林周燕何军李丽艳张勤
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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