Pulse width responsive security system

Details Pulse width responsive security system Pulse width responsive security system

1975-05-14

1977-09-06

Safourek, Benedict V.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 32, 325142, 340167A, H04B 100

Patent

active

040471071

ABSTRACT:
A security system comprises electronic means for generating a group of pulses of predetermined frequency, which group has a unique identity specified by the particular durations of its constituent pulses; means for transmitting that group of pulses; means for receiving that group of pulses; and means responsive to that received group of pulses only when it has said unique identity. Preferably the pulses are bursts of high frequency waves, and the means responsive to received pulses includes means for establishing tolerance intervals for the ends of corresponding pulses.

REFERENCES:
patent: 2951906 (1960-09-01), Brown
patent: 3257651 (1966-06-01), Feisel
patent: 3392559 (1968-07-01), Hedin et al.
patent: 3626373 (1971-12-01), Wilcox
patent: 3806872 (1974-04-01), Odom
patent: 3858116 (1974-12-01), Friedl
patent: 3906348 (1975-09-01), Willmott
patent: 3973241 (1976-08-01), Streckenbach

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