Patent ID: 6810076
Filing Date: 2004-10-26
Classification: H04B

Abstract:
An adaptive echo canceller comprising:a frequency domain update block for estimating and updating a frequency response of an echo channel; a far-end signal estimation block for estimating a frequency response of a target channel and sending a far-end error signal with far-end signals removed to said frequency domain update block for updating the estimated echo channel frequency response; and a time domain echo cancellation block for receiving the updated echo channel frequency response and performing time domain echo cancellation; wherein said time domain echo cancellation block comprises; a zero interpolator receiving a time domain signal and generating an interpolated time domain signal by inserting a pre-determined number of zeros between every two samples of said time domain signal; a truncater for truncating a inverse fast Fourier transform of said estimated echo channel frequency response and generating a truncated time domain echo channel estimate; a linear convolver for convolving said interpolated time domain signal and said truncated time domain echo channel estimate, a zero padding block for padding zeros to said truncated time domain echo channel estimate.