FMCW 레이더 센서 기반의 강의용 광역 마이크 시스템

• Published in: 한국정보통신학회논문지 Vol. 25; no. 4; pp. 611 - 614
• Main Author: Oh, Woojin
• Format: Journal Article
• Language: Korean
• Published: 한국정보통신학회 2021
• Subjects: 전자/정보통신공학; Microphone beamforming; mmWave sensor; Wide range microphone; FMCW radar sensor
• ISSN: 2234-4772; 2288-4165
• DOI: 10.6109/jkiice.2021.25.4.611

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.