Time-varying vocal folds vibration detection using a 24 GHz portable auditory radar

Hong Hong, Heng Zhao, Zhengyu Peng, Hui Li, Chen Gu, Changzhi Li, Xiaohua Zhu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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.

Original languageEnglish
Article number1181
JournalSensors (Switzerland)
Issue number8
StatePublished - Aug 2016


  • Auditory radar
  • Fundamental frequency
  • Non-acoustic
  • VMD
  • Vocal folds


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