远距离语音的激光相干获取及增强

吕韬; 张合勇; 郭劲; 晏春回

doi:10.3788/OPE.20172503.0569

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远距离语音的激光相干获取及增强

现代应用光学 | 更新时间：2020-07-07

- 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
- 光学精密工程 2017年25卷第3期页码：569-575
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2.中国科学院大学, 北京 100049
- 作者简介：
  
  [ "吕韬 (1991-), 男, 浙江绍兴人, 博士研究生, 2014年于浙江工业大学获得学士学位, 主要从事相干微振动测量信号处理技术的研究。E-mail:18767120269@163.com" ]
  [ "郭劲(1964-),男,吉林长春人,研究员,博士生导师,2007年于中科院长春光机所获得博士学位，主要从事激光与物质相互作用技术的研究。E-mail：郭劲@126.com" ]
- 基金信息：
  
  国家自然科学基金资助项目(61205143)
- DOI：10.3788/OPE.20172503.0569
  中图分类号： TN249;TN912.35
- 收稿日期：2016-08-25，
  
  录用日期：2016-11-10，
  
  纸质出版日期：2017-03-25
- 稿件说明：
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吕韬, 张合勇, 郭劲, 等. 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.

Tao LÜ, He-yong ZHANG, Jin GUO, et al. Acquisition and enhancement of remote voice based on laser coherent method[J]. Optics and precision engineering, 2017, 25(3): 569-575.
吕韬, 张合勇, 郭劲, 等. 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. DOI： 10.3788/OPE.20172503.0569.

Tao LÜ, He-yong ZHANG, Jin GUO, et al. Acquisition and enhancement of remote voice based on laser coherent method[J]. Optics and precision engineering, 2017, 25(3): 569-575. DOI： 10.3788/OPE.20172503.0569.

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70 m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5 dB，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

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.

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references

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