| 摘要 |
<p>A method and apparatus are described for reducing, in communication signals (x[n]) received by a local network from a remote network (FAR-IN signals), that energy content that is attributable to echoes of signals (y[n]) transmitted into the local network (NEAR-END signals). This is achieved, in part, by generating a time-varying TEMPLATE signal which represents the smoothed energy content of NEAR-IN signals (y[n-epd]) delayed according to the echo path and attenuated by an estimated echo transmission loss. A non-linear processor (130) passes the FAR-IN signal (x[n]) substantially without attenuation if it exceeds the TEMPLATE, but attenuate the FAR-IN (x[n]) signal if it lies within a defined range below the TEMPLATE.</p> |
