227812 ⎘
Arrangements for interconnection not involving centralised switching; Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
JOINT FAR-END AND NEAR-END SPEECH INTELLIGIBILITY ENHANCEMENT
#2Receive-path signal gain operations
#3Echo canceller device and voice telecommunications device
#4Communication device with echo suppression
#5Clock skew robust acoustic echo cancellation