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This predistortion is accomplished by including in terminals to permit switching the carrier channels to the circuit at the input to the modulator a network different microphones and to different amplifier having relatively high loss for the lower frequencies equipment at the loud speaker end. To take care of and tapering to low loss for the higher frequencies. the contingency of a cable pair failure, spare pairs of Its maximum loss is compensated for by adding in wires were made available to be switched in at short the circuit an equivalent amount of additional ampli-notice. Fortunately, none of the reserve facilities fication. The characteristics of such a network are actually were required for the demonstration. illustrated in Fig. 12. To restore the normal volume relationships between the different tones and over-REFERENCES tones a restoring network having complementary transmission frequency characteristics is, of course, 1. LONG DISTANCE CABLE CIRCUITS FOR PROGRAM TRANSMISSION, A. B. Clark included at the output of the receiving circuit.

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