NONLINEAR ECHO SUPPRESSION

摘要

Presented is a method and associated system for suppression of linear and nonlinear echo. The method includes dividing an input signal into several frequency bands in each of a several of time frames. The input signal may include an echo signal. The method further includes multiplying the input signal in each of the several frequency bands by a corresponding echo suppression signal. Calculating the corresponding echo suppression signal may include estimating a power of the echo signal in a particular frequency band as a sum of several component echo powers, each of the several component echo powers due to an excitation from a far-end signal in a corresponding one of the several frequency bands. Calculating the corresponding echo suppression signal may further include subtracting the power of the echo signal in the particular frequency band from a power of the input signal in the particular frequency hand.

主权项

1. A system for echo suppression, said system comprising:
a microphone configured to receive an input signal; and a processor configured to:
divide the input signal into a plurality of frequency bands in each of a plurality of time frames, said input signal comprising an echo signal; andmultiply said input signal in each of said plurality of frequency bands by a corresponding echo suppression signal, wherein said processor is configured to calculate said corresponding echo suppression signal by:
estimating a power of said echo signal in a particular frequency band as a sum of a plurality of component echo powers, each of said plurality of component echo powers due to an excitation from a far-end signal in a corresponding one of said plurality of frequency bands;subtracting said power of said echo signal in said particular frequency band from a power of said input signal in said particular frequency band; wherein said processor is configured to estimate each of said plurality of component echo powers by:
applying a delay to said far-end signal in said corresponding one of said plurality of frequency bands; andapplying a weight to said far-end signal in said corresponding one of said plurality of frequency bands.