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Enhanced directional sensitivity using acoustic dish reflector

Sawant, O and Bhowmick, A and Sreenivas, TV (2019) Enhanced directional sensitivity using acoustic dish reflector. In: 12th International Conference on Signal Processing and Communications, SPCOM 2018, 16 July - 19 July 2018, Bangalore, pp. 162-166.

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Official URL: https://doi.org/10.1109/SPCOM.2018.8724424


An acoustic reflector is a passive device which is used with microphones to reflect and focus sound waves from a longer distance. They are effective for long-range sound recording without intrusion, such as to record wildlife sounds. In this paper, our objective is to investigate the feasibility of using a dish reflector microphone for indoor activity monitoring of large premises. Acoustic gain and frequency response of the microphone with different parabolic, near parabolic and non-parabolic reflectors are compared with that of the same microphone without the reflector. It is observed that the use of dish reflector does significantly enhance the directivity and sensitivity of sound recording. Keeping to a moderate size reflector, among various shapes and materials, the best reflector has given a 14 dB gain improvement over microphone without reflector at 0 degree azimuth. We also found that among steel and plastic dish reflector of approximately same size and shape, steel dish reflector does give a higher performance as expected. The increased directivity of the dish reflector is giving a significant improvement in indoor monitoring and also for sound source tracking.

Item Type: Conference Paper
Publication: SPCOM 2018 - 12th International Conference on Signal Processing and Communications
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Audio recordings; Frequency response; Microphones; Signal processing; Sound recording, Acoustic reflectors; Directional sensitivity; Gain improvement; Indoor activities; Parabolic reflector; Passive devices; Size and shape; Sound source tracking, Reflection
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 08 Aug 2022 06:46
Last Modified: 08 Aug 2022 06:46
URI: https://eprints.iisc.ac.in/id/eprint/75483

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