Patent ID: 6278785
Filing Date: 2001-08-21
Classification: H04B,H04M

Abstract:
A method for cancelling an echo component in a signal comprising the steps of:simultaneously delaying the component a first period, a second period, and a third period, to produce three signals, x.sub.1, x.sub.2, and x.sub.3 ;wherein the second period is longer than the first period and the third period is longer than the second period;correlating signal x.sub.1 with the signal to produce a first correlation signal c.sub.1 ;correlating signal x.sub.3 with the signal to produce a second correlation signal c.sub.2 ;combining c.sub.1 and c.sub.2 to produce a first difference signal .DELTA..sub.1 ;adjusting the first period, the second period, and the third period in accordance with .DELTA..sub.1 until .DELTA..sub.1 is substantially equal to zero; andsubtracting x.sub.2 from the signal.