Supervised wireless security system

Details Supervised wireless security system Supervised wireless security system

1980-08-29

1983-01-04

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340505, 340506, 340531, 340536, 34082554, 367 2, 455 7, 455 9, 455101, G08B 108, G08B 2600

Patent

active

043674585

ABSTRACT:
An ultrasonic communication system capable of wireless installation and supervised operation is achieved by communicating each information bit as two distinct ultrasonic frequencies separated in frequency enough to assure that the signal strength of both transmissions will not be in a deep null at the receiver location at the same time. The transmissions can be coded with a format that recognizes the correct data transmission even if reception of one frequency is lost. By use of transponders and other auxiliary units with periodic polling, supervised operation throughout a building can be maintained with events such as intrusion, fire or emergency as well as failures of particular units of the system reported.

REFERENCES:
patent: 3696384 (1972-10-01), Lester
patent: 3815093 (1974-06-01), Caretto et al.
patent: 3925763 (1975-12-01), Wadhwani et al.
patent: 3946315 (1976-03-01), Tustison

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