基于PGC解调的激光多普勒语音检测系统  

Acoustic signal detection system using PGC demodulation algorithm and laser Doppler effect

作　　者：张勤[1,2] 张建勇[1] 曾华林[2] 李丽艳[2] 周燕[2] 

机构地区：[1]北京交通大学光波技术研究所,北京100044 [2]中国科学院半导体研究所光电系统实验室,北京100083

出　　处：《红外与激光工程》2011年第6期1115-1118,共4页Infrared and Laser Engineering

基　　金：国家自然科学基金(60837002;60807003);国家973计划(2010CB328206);北京交通大学人才基金(2006RC022)

摘　　要：提出了一种可实现非接触、远距离、高灵敏度的激光多普勒语音检测系统。该系统采用压电陶瓷(PZT)对迈克尔逊干涉仪的参考信号进行调制,利用相位产生载波法(PGC)对干涉信号解调,提高了零差干涉法的抗干扰性,并且具有光路简单、成本低等优点。推导了干涉信号的解析表达式,数值分析了PGC解调参数的最优值。实验结果表明:该系统能动态测量音频范围内的微弱振动,可较好地还原语音信号。Acoustic signal detection using laser Doppler effect system to implement non-contact,remote,and high sensitive acoustic signal vibration detection was proposed.In the system,the reference signal of a Michelson interferometer was modulated by piezoelectric ceramics（PZT）,the received signal was demodulated by the phase generated carrier（PGC） algorithm.Therefore,the system can improve the anti-interference performance and has the advantages of simple optical configuration and low cost.The parameters of the PGC algorithm were optimized according to the analytic form of the interference signal.The numerical results show that the optimum value of the parameter is 2.63.Finally,the experimental results illustrate that the system can dynamically detect the vibration caused by sound wave and can recover voice signal from the received signal.

关 键 词：激光多普勒干涉 语音检测 PGC解调 

分 类 号：TN247[电子电信—物理电子学]