ECHO PHASE COMPENSATING DEVICE AND APPLICATION THEREOF TO ECHO CANCELLATION DEVICES

摘要

The present invention relates to the simultaneous two-way data transmission on 2-wire circuit, and more particularly to the technique of echo cancellation. The rapid fluctuations wn are actualized with a first phase actualization loop, and the slow fluctuations un with a second phase actualization loop, from the increase dwn = .alpha.Im (en.sigma.n*); un and wn are added for obtaining the natural phase .sigma.n of the echo. The invention applies to the cancellation of echos bearing phase and frequency drift.