Automatic Distortion Correction for Efficient Pulse Transmission

Automatic correction of pulse distortion provides the prospect for materially extending the efficiency of data communications over telephone networks. Systems that will compensate automatically for deficiencies in the phase and amplitude characteristics of a transmission channel are shown to be technically feasible. Two specific systems are demonstrated: The first, a “time-reversal” system, compensates for distortion in the phase characteristic only, and the second, a “time-domain” system, compensates for distortion in amplitude as well as phase. The theoretical basis of this work is presented and verified by experimental results obtained on simulated lines and on common-carrier channels.