Adaptive Noise Cancellation
by
James J. Caffery & David E. Kreml
Advisor: Dr. T. L. Stewart
An adaptive system that eliminates unwanted noise by producing the anti-noise
over a loud speaker has been developed. An adaptive IIR algorithm was used
to produce the anti-noise which is added to the original noise to obtain
a cancelling effect. Two microphones and a speaker were necessary. One
microphone measured the noise source. The second microphone measured how
effectively the noise was being reduced and was used to modify the weights
of the adaptive filter. The algorithm used for the IIR adaptive filter
was the RLMS algorithm and was implemented on the TMS320C25 digital signal
processing board.
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