Abstract
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.
Highlights
Obtaining accurate, reliable speech signals is necessary for humans to communicate and exchange information in various situations, especially in noisy environments
This paper evaluates the use of the novel radar sensor as a potential tool for detecting speech signals
The capability of the millimeter microwave (MMW) radar for detecting speech has been mentioned for pure experiments [9], clinic diagnoses, and speech processing applications [7,8,32]
Summary
Reliable speech signals is necessary for humans to communicate and exchange information in various situations, especially in noisy environments. Conventional speech and acoustic transducers, such as condenser microphones, detect speech signals by perceiving the motion of air particles when sound is spread via an air medium [1] Another technique that has been thoroughly explored is speech detection via perceptions of sound pressure [2,3]. Li Zong Wen’s group reported using the Doppler radar with grating structures to detect speech signals [4] They studied the operating principle based on the wave propagation theory and the interaction between the electromagnetic wave (EMW) and the acoustic wave (AW) on large numbers of particles in the air and on the interface of two media. A novel speech sensor that uses a millimeter microwave (MMW) radar with high operating frequency and a superheterodyne receiver has been developed. The ability of the radar sensor to penetrate non-metal materials was assessed as well
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