摘要
目的：研究94 GHz生物雷达探测语音的性能和能力。方法：搭建94 GHz生物雷达语音探测平台,利用该平台设计并开展94 GHz生物雷达与麦克风的语音同步探测实验研究,并结合语音数字信号处理方法分析所采集语音信号的特征。结果：通过对比分析发现,麦克风语音的主能量频率范围为0~4 000 Hz,94 GHz雷达语音的主能量区集中在0~1 200 Hz之间,且后者的最大作用距离可达20 m。结论：94 GHz生物雷达弥补了麦克风系统对低频率、低能量语音捕获能力不足的一面,为远距离、非接触探测语音提供了一种新方法。
Objective To explore the performance and capacity of 94 GHz bioradar in speech detection. Methods A speech detection platform based on 94 GHz bioradar was built, and then was used to design and carry out experimental investigations of speech synchronization detection with 94 GHz bioradar and microphone and combine the speech digital signal processing method to analyze the characteristics of the acquired speech signals. Results Comparative analysis found that the major energy distribution of microphone speech was in 0 to 4 000 Hz frequency range, and the 94 GHz radar speech was in 0 to 1 200 Hz.The maximum performance distance of 94 GHz bioradar for speech detection reached 20 m. Conclusion 94 GHz bioradar can compensate for the low frequency and low energy speech detection capability of microphone system and provides a new method for long distance and non-contact speech detection.
出处
《医疗卫生装备》
CAS
2016年第3期1-4,共4页
Chinese Medical Equipment Journal
基金
国家自然科学基金项目(61371163)
关键词
生物雷达
语音探测
毫米波
bioradar
speech detection
millimeter wave
