光学精密工程2017，Vol.25Issue(3)：569-575,7.DOI:10.3788/OPE.20172503.0569
远距离语音的激光相干获取及增强
Acquisition and enhancement of remote voice based on laser coherent method
摘要
Abstract
An all-fiber Laser Doppler Vibrometer (LDV) based on laser coherent method was investigated to acquire remote and high quality speech signals,combining with the Wiener speech enhancement technology.First,the heterodyne detection theory and the characteristic of fiber devices were introduced and the all-fiber LDV was established experimentally to detect the throat vibration,thus the remote voice was acquired.Whereas the direct acquisition of speech signals was prone to be disturbed by serious noise,the Wiener Filtering based on Minima Controlled Recursive Averaging (MCRA) was used to suppress the noise and improve the voice quality.The results indicate that the comprehensible speech signals within the range of 70 m can be obtained by the LDV.The speech enhancement technology can suppress the noise effectively and the Signal to Noise Ratio (SNR) was increased by 5 dB,thus the speech intelligibility was improved.This system has ability to acquire remote voice with high quality.关键词
激光相干测振/语音获取/语音增强/维纳滤波Key words
laser Doppler vibrometer/voice acquisition/speech enhancement/Wiener filtering分类
信息技术与安全科学引用本文复制引用
吕韬,张合勇,郭劲,晏春回..远距离语音的激光相干获取及增强[J].光学精密工程,2017,25(3):569-575,7.基金项目
国家自然科学基金资助项目(No.61205143) （No.61205143）
