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Laser doppler interference based voice detecting system

A technology of voice detection and laser, which is applied in the direction of voice analysis, optical devices to transmit sensing components, instruments, etc., can solve the problems of high frequency, high modulation frequency, inconvenient detection and signal processing, etc., and achieve small nonlinear errors and reduce Processing speed and the effect of improving system work efficiency

Active Publication Date: 2013-11-20
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The applicant realized that the existing technology has the following technical defects: although the heterodyne interferometry can effectively eliminate the influence of environmental disturbances, because the modulation frequency of the acousto-optic crystal is relatively high, the frequency of direct detection using heterodyne is relatively high, giving Detection and signal processing bring great inconvenience

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  • Laser doppler interference based voice detecting system
  • Laser doppler interference based voice detecting system
  • Laser doppler interference based voice detecting system

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Embodiment Construction

[0015] 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.

[0016] figure 1 It is a schematic diagram of a speech detection system based on laser Doppler interference according to an embodiment of the present invention. Such as figure 1 As shown, the present invention adopts the basic structure of M-Z interferometer. The laser is a narrow linewidth semiconductor fiber laser with a working wavelength of 1550nm and a frequency stability of 10 -7 , power stability is 1%.

[0017] Such as figure 1 As shown,...

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Abstract

The invention discloses a voice detecting system. In the voice detecting system, optical frequency modulation of laser is realized through a difference generated by two acoustic optical modulators, thus, an interference signal to be detected is separated from a low-frequency environment disturbance signal, and the processing speed of a circuit and the acquiring speed of an acquisition card are reduced; meanwhile, frequency and data volume are reduced a lot, therefore, the system working data volume is reduced, and the system working efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of optical industry detection, in particular to a voice detection system based on laser Doppler interference. Background technique [0002] The laser Doppler frequency reduction detection technology is derived from the traditional laser Doppler heterodyne vibration measurement technology. The laser Doppler heterodyne interferometry generally adopts a Mach-Zehnder interference interferometer structure or a dual-frequency laser structure. The signal modulates the high-frequency signal to achieve spectrum shift, so as to isolate the signal to be tested from the low-frequency environmental disturbance (less than 200Hz), and finally uses the frequency demodulation method for signal detection. [0003] The applicant realized that the existing technology has the following technical defects: although the heterodyne interferometry can effectively eliminate the influence of environmental disturbances, because the modu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L25/78G01D5/26G10L25/00
Inventor 曾华林周燕何军李丽艳
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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