公开(公告)号：CA984472A

公开(公告)日：1976-02-24

申请号：CA167865

申请日：1973-03-28

Applicant: IBM

Inventor： LAUTIER ALEX ,  MADDENS FRANCIS P ,  NUSSBAUMER HENRI J ,  PIERRET JEAN M

IPC: H04B3/06 ,  H03H17/00 ,  H03H17/08 ,  H04L27/01

Abstract: A self-adjustable equalizer for a phase modulation communication system in which the equalizer output signal s is sampled at the modulation rate and weighted by a factor proportional to envelope amplitude distortion dR/R, R being the envelope amplitude at given instants and the product sdR/R being the adjustment control signal. In the preferred embodiment the product of the sign of s and the sign of dR serves as the control or error signal. One implementation frequency translates the equalizer output signal and compares the amplitude of the translated signal with a reference at given instants to determine the sign of dR which is eventually multiplied by the sign of s.