Patent ID: 7742592
Filing Date: 2010-06-22
Classification: H04M

Abstract:
1. A method for processing audio signals, comprising the steps of: receiving a loudspeaker signal, wherein the input signal is applied to a loudspeaker; receiving a microphone signal generated by a microphone; transforming the loudspeaker signal into sampled short-time spectra; transforming the microphone signal into sampled short-time spectra; selecting one or two delayed loudspeaker spectra by: estimating for each subband of the selected spectra a coloration correction value; using information of the selected loudspeaker spectra, current microphone spectrum, and coloration correction values to determine gain filter values; modifying the microphone spectrum magnitude by applying the gain filter values to the microphone spectrum; and computing the echo suppressed microphone signal by converting the magnitude modified microphone spectrum to the time domain.