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Sensors 2010, 10(5), 4622-4633;

A Novel Radar Sensor for the Non-Contact Detection of Speech Signals

Department of Biomedical Engineering, Fourth Military Medical University, Xian, 710032, China
Author to whom correspondence should be addressed.
Received: 26 March 2010 / Revised: 28 April 2010 / Accepted: 29 April 2010 / Published: 4 May 2010
(This article belongs to the Section Chemical Sensors)
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Different speech detection sensors have been developed over the years but they are limited by the loss of high frequency speech energy, and have restricted non-contact detection due to the lack of penetrability. This paper proposes a novel millimeter microwave radar sensor to detect speech signals. The utilization of a high operating frequency and a superheterodyne receiver contributes to the high sensitivity of the radar sensor for small sound vibrations. In addition, the penetrability of microwaves allows the novel sensor to detect speech signals through nonmetal barriers. Results show that the novel sensor can detect high frequency speech energies and that the speech quality is comparable to traditional microphone speech. Moreover, the novel sensor can detect speech signals through a nonmetal material of a certain thickness between the sensor and the subject. Thus, the novel speech sensor expands traditional speech detection techniques and provides an exciting alternative for broader application prospects. View Full-Text
Keywords: non-contact detection; microwave radar; speech signal; penetrability non-contact detection; microwave radar; speech signal; penetrability

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Jiao, M.; Lu, G.; Jing, X.; Li, S.; Li, Y.; Wang, J. A Novel Radar Sensor for the Non-Contact Detection of Speech Signals. Sensors 2010, 10, 4622-4633.

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