Echo cancelling system comprising cascade-connected local...

Details Echo cancelling system comprising cascade-connected local... Echo cancelling system comprising cascade-connected local...

H - Electricity

04

B

379/64, 340/72

H04B 3/23 (2006.01) H03H 15/00 (2006.01)

Patent

CA 1219649

23 Abstract of the Disclosure: In an echo cancelling system responsive to a send-in signal including an echo signal and to a receive-in signal, a plurality of local echo cancellers are connected in cascade through an additional delay circuit between two adjacent ones of the local echo cancellers to locally cancel parts of the echo signal. The receive-in signal is successively delayed by a delay circuit to be delivered to the local echo cancellers as delayed signals which have different delays relative to the receive-in signal and which correspond to the parts of the echo signal. Each local echo canceller produces a partially echo- cancelled signal by the use of a transversal filter and an adder. Each partially echo-cancelled signal is sent to the transversal filter of each local echo canceller and to the additional delay circuit. The local echo cancellers are put into operation independently of one another.

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