Echo canceller having Kalman filter for optimal adaptation

Echo canceller using an echo path status detection

Echo canceller using impulse response estimating method

Echo canceller using parametric methods

Echo canceller with adaptive and non-adaptive filters

Echo canceller with adaptive suppression of residual echo level

Echo canceller with dynamically positioned adaptive filter taps

Echo canceller with improved doubletalk detection

Echo canceller with relative feedback control

Echo cancelling arrangement

Echo cancelling system

Echo compensation device and 4/2-wire interface having such an e

Echo controlling apparatus of video conferencing system and...

Echo detection, tracking, cancellation and noise fill in real ti

Echo measurement arrangement

Echo removing apparatus

Electric power circuit for telephone set use

Electrical receptacle with open corner region

End office of a telephone system with a zero loss plan

Enhanced echo canceller for digital cellular application