公开(公告)号：DE2317597A1

公开(公告)日：1973-11-15

申请号：DE2317597

申请日：1973-04-07

Applicant: IBM

Inventor： LAUTIER ALEX ,  MADDENS FRANCIS PAUL ,  NUSSBAUMER HENRI JEAN ,  PIERRET JEAN MARC

IPC: H04B3/06 ,  H03H17/00 ,  H03H17/08 ,  H04L27/01 ,  H04L27/22

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.