Distortion Correction in Electrical Circuits with Constant Resistance Recurrent Networks

Constant resistance recurrent networks, t h a t is, networks whose iterative impedances are a pure constant resistance at all frequencies, form here the basis of a method of distortion correction which is applicable to any electrical circuit. T h e paper takes up first the general problem of distortion correction, then this method of correction and its application in the following Parts and supplementary Appendices. PART 1. Ideal Circuit Characteristics. Both ideal steady-state attenuation and phase characteristics are formulated and then verified as being necessary and sufficient for the preservation of signal-shape under transient conditions. PART 2. Constant Resistance Recurrent Networks. These networks are of three general types and are made possible by the introduction of inverse networks of constant impedance product. Their propagation characteristics are considered in sorrte detail and various methods of design are indicated. PART 3. Arbitrary Impedance Recurrent Networks. These networks are a generalization of those in Part 2. PART 4. Applications. The large variety of uses to which these networks may be put is illustrated by specific designs made for complementary distortion correcting networks, for a submarine cable circuit, a loaded-cable program transmission circuit, and an open-wire television circuit. In addition, networks are given for the equalization of variable attenuation in carrier telephone circuits, for phase correction in the transatlantic telephone system and for the simulation of a smooth line.