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RESEARCH PAPERS: Noise Control and Acoustics

Stable Method for Active Cancellation of Duct Noise by Synthesized Sound

[+] Author and Article Information
K. Kido, S. Morikawa, M. Abe

Research Center for Applied Information Sciences, Tohoku University, Katahira 2-1-1, Sendai 980, Japan

J. Vib., Acoust., Stress, and Reliab 109(1), 37-42 (Jan 01, 1987) (6 pages) doi:10.1115/1.3269392 History: Received August 01, 1986; Online November 23, 2009

Abstract

This paper describes an active noise cancellation system utilizing computer-synthesized sound. This computer-synthesized sound is generated by using a new method to estimate the impulse response of a system involving inverse transfer function of a loudspeaker. A loudspeaker is set close to the end of a duct to radiate sound for cancellation. The loudspeaker is driven by a signal which is synthesized by convoluting the estimated impulse response and the wave form of a noise picked up by a microphone set in the duct. The system is substantially stable. In our experiment, using a duct 8.5 m in length, the sound pressure at a point outside the duct is decreased by about 3 to 8 dB over a frequency range between 50 Hz and 200 Hz.

Copyright © 1987 by ASME
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