Importance

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Abstract

1. In a multichannel communication system in which the intelligence waves are transmitted by pulse code modulation, means for producing a plurality of series of pulses interleaved in their time of occurrence and the pulses of each series being modulated in duration in proportion to successive samples of the intelligence wave of a corresponding channel, a source of oscillations of constant frequency, a gate controlled by the duration modulated pulses for transmitting oscillations from said source for the duration of each of said pulses, a binary counter having a plurality of tandem connected stages each of two conditions of stability, means for supplying to said counter the oscillations transmitted by said gate, a storage circuit for each stage of said binary counter except the first, a switching circuit connecting each of said storage circuits to the corresponding stage of the binary counter to supply to the storage circuit an electrical quantity under control of the condition of stability of the respective counter stage, a timing circuit for producing a sequence of pulses corresponding to the pulse intervals of each pulse code group, a pulse circuit under control of the first stage of said counter, connections for supplying the first pulse of each of said sequences to said pulse circuit to render it operative for transmitting a pulse when the first stage of said counter is in a predetermined one of said conditions of stability, other connections for supplying said first pulse of each of sequences to said switching circuits for registering on said storage circuit the condition of stability of the respective counter stage, a pulse circuit under control of each of said storage circuits, and connections for supplying to the last-mentioned pulse circuits in succession corresponding subsequent pulses of each of said sequences to render the pulse circuits operative for transmitting a pulse under control of the condition of the corresponding storage circuit.

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First Claim