Security remote control method and system

Details Security remote control method and system Security remote control method and system

1956-11-06

1976-02-17

Wilbur, Maynard R.

325 37, 325 51, 325 60, H04K 100, H04B 100

Patent

active

039394190

ABSTRACT:
1. A security remote control system comprising a pair of carrier generato means for balance modulating both the carriers from said generators by a single source of noise at a first station and means for transmitting only the side bands, a receiver at a second station for said side bands, means for combining the side bands of said pair of carriers to provide a beat frequency signal corresponding to the frequency difference of said pair of carriers, narrow band filter means to isolate said signal, and means responsive to said signal for controlling an operation at said second station.

REFERENCES:
patent: 1565521 (1925-12-01), Stone et al.
patent: 2658992 (1953-11-01), Byrne

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