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Sensors 2016, 16(8), 1181;

Time-Varying Vocal Folds Vibration Detection Using a 24 GHz Portable Auditory Radar

School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 12 June 2016 / Revised: 20 July 2016 / Accepted: 25 July 2016 / Published: 28 July 2016
(This article belongs to the Special Issue Non-Contact Sensing)
Full-Text   |   PDF [758 KB, uploaded 28 July 2016]   |  


Time-varying vocal folds vibration information is of crucial importance in speech processing, and the traditional devices to acquire speech signals are easily smeared by the high background noise and voice interference. In this paper, we present a non-acoustic way to capture the human vocal folds vibration using a 24-GHz portable auditory radar. Since the vocal folds vibration only reaches several millimeters, the high operating frequency and the 4 × 4 array antennas are applied to achieve the high sensitivity. The Variational Mode Decomposition (VMD) based algorithm is proposed to decompose the radar-detected auditory signal into a sequence of intrinsic modes firstly, and then, extract the time-varying vocal folds vibration frequency from the corresponding mode. Feasibility demonstration, evaluation, and comparison are conducted with tonal and non-tonal languages, and the low relative errors show a high consistency between the radar-detected auditory time-varying vocal folds vibration and acoustic fundamental frequency, except that the auditory radar significantly improves the frequency-resolving power. View Full-Text
Keywords: non-acoustic; vocal folds; fundamental frequency; VMD; auditory radar non-acoustic; vocal folds; fundamental frequency; VMD; auditory radar

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Hong, H.; Zhao, H.; Peng, Z.; Li, H.; Gu, C.; Li, C.; Zhu, X. Time-Varying Vocal Folds Vibration Detection Using a 24 GHz Portable Auditory Radar. Sensors 2016, 16, 1181.

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