Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Widerange Microphone System for Lecture using FMCW Radar Sensor

FMCW 레이더 센서 기반의 강의용 광역 마이크 시스템

  • Oh, Woojin (School of Electronic Engineering, Kumoh National Institute of Technology)
  • Received : 2021.03.02
  • Accepted : 2021.03.11
  • Published : 2021.04.30
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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.

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Acknowledgement

This research was supported by Kumoh National Institute of Technology(2018-104-070)

References

  1. J. Benesty, M. M. Sondhi, and Y. Huang, Springer handbook of speech processing, New York, NY: Springer, 2008.
  2. M. Yiwere and E. J, Rhee, "3-D Sound Source Localization using Energy-Based Region Selection and TDOA," Journal of the Korea Institute of Information and Communication Engineering, vol. 21, no. 2, pp. 294-300, Feb. 2017. https://doi.org/10.6109/jkiice.2017.21.2.294
  3. W. Oh, "Wide Coverage Microphone System for Lecture Using Ceiling-Mounted Array Structure," Journal of the Korea Institute of Information and Communication Engineering, vol. 22, no. 4, pp. 624-633, Apr. 2018. https://doi.org/10.6109/JKIICE.2018.22.4.624
  4. E. Yavari, C. Song, V. Lubecke, and O. Boric-Lubecke, "Is there anybody in there?: Intelligent radar occupancy sensors," IEEE Microwave Magazine, vol. 15, no. 2, pp. 57-64, 2014. https://doi.org/10.1109/MMM.2013.2296210
  5. S. Rao, Introduction to mmWave sensing: FMCW radars [Internet], 2017. Available: https://training.ti.com/node/1139153.
  6. Texas Instrument. (Apr, 2020). User's Guide: mmWave Demo Visualizer [Internet]. Available: https://www.ti.com/lit/ug/swru529c/swru529c.pdf.
  7. S. Seo and M. Kim. "3D Impulsive Sound-Source Localization Method through a 2D MEMS Microphone Array using Delay-and-Sum Beamforming," in Proceedings of the 9th International Conference on Signal Processing Systems (ICSPS 2017), Auckland, New Zealand, pp. 170-174, 2017.