| 摘要 |
Adaptation of an adaptive filter in an echo canceller is inhibited (48) afte r initial convergence (46) and is enabled (42) again in response to an echo attenuation parameter being less than a first threshold value (54) and a variation of an echo attenuation parameter being less than a second threshol d value (56), this situation representing a detected echo path change. The detection of an echo path change is inhibited (53) in the presence of a near end signal. The echo attenuation parameters can be either or both of the ERL E (echo return loss enhancement) or the combined attenuation of the ERLE plus the hybrid circuit ERL (echo return loss), these parameters being determined from averaged signal levels on the signal paths.
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