Telecontrol message transmission system

Details Telecontrol message transmission system Telecontrol message transmission system

1978-12-04

1980-04-08

Bookbinder, Marc E.

Communications: electrical

Condition responsive indicating system

Specified housing

364819, H04B 1504

Patent

active

041974999

ABSTRACT:
A telecontrol order transmission system having at the transmitting end a source, for generating ergodic random signals x(t), a circuit for alternately delivering the sum and the difference of signals x(t) and x(t-T.sub.1), which circuit is switched at the rate of a frequency f.sub.c and, at the receiving end, a multiplier multiplies a received signal by said received signal delayed by time lapse T.sub.i, an integrator for time averaging the output of said multiplier, a band-pass filter with a narrow bandwidth centered about frequency f.sub.c, connected to the output of said integrator, and a circuit for deriving a telecontrol order from the output of said filter.

REFERENCES:
patent: 3337803 (1967-08-01), Costas et al.
patent: 3876620 (1975-02-01), Coor
patent: 4065718 (1977-12-01), Attwood

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