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Sensors 2013, 13(11), 14248-14260; doi:10.3390/s131114248

A 94-GHz Millimeter-Wave Sensor for Speech Signal Acquisition

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Received: 22 August 2013 / Revised: 7 October 2013 / Accepted: 10 October 2013 / Published: 24 October 2013
(This article belongs to the Section Physical Sensors)
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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 millimeter wave; speech acquisition; radar sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

AMA 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(11):14248-14260.

Chicago/Turabian Style

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.

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