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http://dx.doi.org/10.6109/jkiice.2021.25.4.611

Widerange Microphone System for Lecture using FMCW Radar Sensor  

Oh, Woojin (School of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.25, no.4, 2021 , pp. 611-614 More about this Journal
Abstract
In this paper, we propose a widerange array microphone for lecturer tracked with Frequency Modulated Continuous Waveform (FMCW) radar sensor. Time Difference-of-Arrival (TDoA) is often used as audio tracking, but the tracking accuracy is poor because the frequency of the voice is low and the relative frequency change is large. FMCW radar has a simple structure and is used to detect obstacles for vehicles, and the resolution can be archived to several centimeter. It is shown that the sensor is useful for detecting a speaker in open area such as a lecture, and we propose an wide range 4-element array microphone beamforming system. Through some experiments, the proposed system is able to adequately track the location and showed a 8.6dB improvement over the selection of the best microphone.
Keywords
Wide range microphone; FMCW radar sensor; mmWave sensor; Microphone beamforming;
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