Patent ID: 6097820
Filing Date: 2000-08-01
Classification: G10L

Abstract:
A noise suppressor that increases a signal to noise ratio of time domain audio data, comprising:frequency domain transformation circuitry that transforms a frame of said time domain audio data into a frame of frequency domain audio data;noise background modeling circuitry, coupled to said frequency domain transformation circuitry, that spectrally analyzes said frame of frequency domain audio data and exponentially smooths said frame with past frames of said frequency domain audio data to model an estimated noise background spectrum thereof;a frequency domain suppression filter, coupled to said noise background modeling circuitry, that filters at least some of said noise background spectrum from said frame of frequency domain audio data; andtime domain transformation circuitry, coupled to said frequency domain suppression filter, that transforms said frame back into said time domain, said transformed frame of time domain audio data having an increased signal to noise ratio.