远距离语音的激光相干获取及增强

发布时间：2018-01-18 04:27

本文关键词：远距离语音的激光相干获取及增强　出处：《光学精密工程》2017年03期 　论文类型：期刊论文

【摘要】：基于激光相干探测理论建立了全光纤激光相干测振系统,并结合维纳语音增强技术实现了远距离、高质量语音信号的获取。首先,介绍了该系统的检测原理及光纤器件特性,搭建了全光纤激光相干测振实验系统检测发音者咽喉振动,从而实现远距离语音信号的获取。由于直接获取的语音信号受到严重的噪声干扰,采用基于最小控制递归平均算法估计噪声的维纳滤波来抑制噪声,提高语音质量。实验结果显示:激光相干测振系统可有效获取70m内的语音信号(检测喉咙振动还原语音);语音增强技术可有效抑制噪声,将信噪比提高5dB,并增强语音的清晰度。由此表明,该系统具备获取远距离、高质量语音信号的能力。
[Abstract]:Based on the theory of laser coherent detection, an all-fiber laser coherent vibration measurement system is established, and the wiener speech enhancement technology is used to achieve the acquisition of long-distance and high-quality speech signals. The principle of the system and the characteristics of the optical fiber devices are introduced. An all-fiber laser coherent vibration measurement system is built to detect the throat vibration of the speaker. Because the directly acquired speech signal is seriously disturbed by noise, Wiener filter based on minimum control recursive average algorithm is used to suppress the noise. The experimental results show that the laser coherent vibration measurement system can effectively obtain the voice signal within 70 m. Speech enhancement technology can effectively suppress noise, increase signal-to-noise ratio (SNR) by 5 dB, and enhance speech clarity, which shows that the system has the ability to obtain long distance and high quality speech signals.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家自然科学基金资助项目(No.61205143)
【分类号】：TN249;TN912.3
【正文快照】： 2.中国科学院大学,北京100049)1引言激光相干检测技术源于20世纪80年代,因具有高灵敏性、抗干扰性强、非接触式及远距离等优点而在精密测量与工业生产中获得了广泛的应用[1-2]。激光相干检测系统能在非接触情况下检测较远距离目标的微小振动,因此可通过检测由声压引起的物体表

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