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. 2013 Oct 24;13(11):14248–14260. doi: 10.3390/s131114248

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 2. — Diagram of experimental system for speech signal detection. The experimental system includes a 3 mm radar system, a 8 mm simple radar system, a 8 mm superheterodyne radar system, and a microphone.