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A 94-GHz Millimeter-Wave Sensor for Speech Signal Acquisition
College of Biomedical Engineering, Fourth Military Medical University, Xi'an 710032, China
These authors contributed equally to this work and should be regarded as co-first authors.
* Author to whom correspondence should be addressed.
Received: 22 August 2013; in revised form: 7 October 2013 / Accepted: 10 October 2013 / Published: 24 October 2013
Abstract: High frequency millimeter-wave (MMW) radar-like sensors enable the detection of speech signals. This novel non-acoustic speech detection method has some special advantages not offered by traditional microphones, such as preventing strong-acoustic interference, high directional sensitivity with penetration, and long detection distance. A 94-GHz MMW radar sensor was employed in this study to test its speech acquisition ability. A 34-GHz zero intermediate frequency radar, a 34-GHz superheterodyne radar, and a microphone were also used for comparison purposes. A short-time phase-spectrum-compensation algorithm was used to enhance the detected speech. The results reveal that the 94-GHz radar sensor showed the highest sensitivity and obtained the highest speech quality subjective measurement score. This result suggests that the MMW radar sensor has better performance than a traditional microphone in terms of speech detection for detection distances longer than 1 m. As a substitute for the traditional speech acquisition method, this novel speech acquisition method demonstrates a large potential for many speech related applications.
Keywords: millimeter wave; speech acquisition; radar sensor
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Cite This Article
MDPI and ACS Style
Li, S.; Tian, Y.; Lu, G.; Zhang, Y.; Lv, H.; Yu, X.; Xue, H.; Zhang, H.; Wang, J.; Jing, X. A 94-GHz Millimeter-Wave Sensor for Speech Signal Acquisition. Sensors 2013, 13, 14248-14260.
Li S, Tian Y, Lu G, Zhang Y, Lv H, Yu X, Xue H, Zhang H, Wang J, Jing X. A 94-GHz Millimeter-Wave Sensor for Speech Signal Acquisition. Sensors. 2013; 13(11):14248-14260.
Li, Sheng; Tian, Ying; Lu, Guohua; Zhang, Yang; Lv, Hao; Yu, Xiao; Xue, Huijun; Zhang, Hua; Wang, Jianqi; Jing, Xijing. 2013. "A 94-GHz Millimeter-Wave Sensor for Speech Signal Acquisition." Sensors 13, no. 11: 14248-14260.