Communication system

Telecommunications – Carrier wave repeater or relay system – Frequency or phase modulation

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343100CL, H04K 100

Patent

active

042453461

ABSTRACT:
1. In combination: a signal source for producing a signal having characteristic variations representative of intelligence, a first code source for producing a first code signal having apparently random characteristic variations but actually having characteristic variations conforming to a first particular code sequence which repeats after a relatively short time interval, a second code source for producing a second code signal likewise having apparently random characteristic variations but actually having characteristic variations conforming to a second particular code sequence which may repeat after a relatively long time interval, modifying circuit means responsive to the intelligence signal from the signal source and to a coded signal for modifying the characteristics of the coded signal in accordance with the characteristics of the intelligence signal, and means responsive to the signals from the first code source and to the signals from the second code source for initially introducing the first code signal to the modifying means for modification of such signal in accordance with the characteristics of the intelligence signal and of the first code signal and for subsequently introducing the second code signal to the modifying means for modification of the second code signal in accordance with the characteristics of the intelligence signal.

REFERENCES:
patent: 2123716 (1938-07-01), Crosby
patent: 2401405 (1946-06-01), Bedford
patent: 2401454 (1946-06-01), Bemis
patent: 2423546 (1947-07-01), Bedford
patent: 2530140 (1950-11-01), Atkins
patent: 2568926 (1951-09-01), Moran
patent: 2768372 (1956-10-01), Green
patent: 2847572 (1958-08-01), Favin

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