Patent ID: 6628780
Filing Date: 2003-09-30
Classification: H04B

Abstract:
A coder/decoder CODEC for use in echo canceling, the apparatus comprising:a decoder for decoding a coded signal and for providing a decoded signal; an analog to digital convener for convening a received analog signal into a digital signal; an echo canceler comprising: a fixed echo canceler for processing the digital signal to provide the an echo-canceled signal for a current data call; and an adaptive echo canceler for determining, off-line, the tap coefficient values for a next data call, wherein the echo canceler uses coefficient values determined off-line by the adaptive echo canceler during a previous data call for the current data call; a coder for coding the echo-canceled signal into a coded signal; and memory element for storing the tap coefficient values detected by the adaptive echo canceler such that the stored tap coefficient values used by the fixed echo canceler are not adapted during the current data call.