Adjacent-channel inhibition in acoustic onset detection
T. Shahwan, Richard O. Duda · 2002
Simple acoustic onset detectors respond to sudden changes in energy levels. Unfortunately, they respond to frequency modulation as well as to amplitude modulation, and have high false-alarm rates in the presence of siren or chirp signals. The authors show how adjacent-channel inhibition can be used to greatly reduce the false-alarm rate. An LMS procedure is used to obtain optimal inhibitory weights. Computer simulations reveal how the response to chirps varies with the rate of change of instantaneous frequency.>