Method and arrangement for choosing supply voltage

Method and arrangement for supplying direct current to a telepho

Method and circuit arrangement for compensating cross-talk and/o

Method and circuit arrangement for controlling a subscriber...

Method and circuit arrangement for detecting speech in a telepho

Method and circuit for echo-cancellation in two-way...

Method and device for analysis of a return signal and adaptive e

Method and device for echo cancellation using power...

Method and device for power supply in telecommunication systems

Method and device for transmitting a transmission signal via...

Method and system for controlling echo cancellation using...

Method and system for data communication

Method and system for eliminating acoustic echos in a digital te

Method and system for extending backup battery life in...

Method and system for providing DC power on local telephone...

Method and system for scaleable near-end speech cancellation...

Method and system for selecting a frequency for...

Method for adjusting a ringing signal current in a...

Method for adjusting the balancing impedance of a hybrid junctio

Method for avoiding self-oscillation in conjunction with echo ca