Universal reconfigurable echo cancellation system

摘要

A universal reconfigurable system and method are provided for reducing nonlinear echo and residual echo, and for echo leakage prevention in various time-varying and complex environments is proposed in this invention. According to one embodiment an echo cancellation system includes (1) an adaptive linear filter implemented in either time-domain or frequency-domain; (2) a nonlinear echo suppression; (3) echo leakage prevention; (4) direct current (DC), low frequency residual echo and noise reduction; (5) time-domain nonlinear processor (NLP) to reduce the residual echo; and (6) frequency-domain NLP to further reduce the residual echo. The echo cancellation system is universally applicable to acoustic echo cancellation (AEC) and/or electrical echo cancellation applications. In terms of AEC, this invention is reconfigurable for one or more microphones and/or one or more reference channels. The numbers of microphones and reference channels are user configurable.

主权项

1. A system for processing signals, comprising:
an echo cancellation linear processing module configured for generating a first output signal by adaptively filtering an input signal, the first output signal being the input signal with any linear echo reduced; a nonlinear echo processing module configured for generating a second output signal based on the first output signal, the second output signal being the first output signal with any residual linear echo or nonlinear echo reduced; and an echo leakage prevention module configured for generating a third output signal based on the second output signal, the third output signal being the second output signal with echo leakage reduced.