Verfahren zur automatischen Kontrolle der Impulsentzerrung

摘要

A distortion correction scheme and apparatus in which communication signals are transmitted in the form of discrete pulses separated from one another by individual constant amplitude pulses of short time interval and irregularly changing sign. A transversal filter under control of a correlator corrects for the distortion present. The reference signal which is employed to adjust the regulating voltages developed by the correlator to control the product forming circuits of the transversal filter, is interrupted during the occurrence of each communication pulse whereby any adjustment necessary in the correction of distortion is performed continuously throughout transmission and only during those intervals in which communication signals are absent. Means are disclosed for generating the inserted signals in a quasi-statistical manner and for synchronizing operation at both the transmitting and receiving ends of the channel.