Patent ID: 9065895
Filing Date: 2015-06-23
Classification: H04M

Abstract:
1. An echo cancellation system, comprising: a first echo canceller that is operable to receive a far-end audio signal and a microphone signal, to utilize the far-end audio signal to generate an estimated linear echo signal, and to subtract the estimated linear echo signal from the microphone signal to generate a first estimated near-end audio signal; a preprocessor operable to apply an adaptive time domain preprocessing function to the far-end audio signal to generate a non-linear echo reference signal; and a second echo canceller that is operable to receive the non-linear echo reference signal and the first estimated near-end audio signal, to utilize the non-linear echo reference signal to generate an estimated non-linear echo signal, and to subtract the estimated non-linear echo signal from the first estimated near-end audio signal to generate a second estimated near-end audio signal.