Security system with memory in transmitter and receiver

Details Security system with memory in transmitter and receiver Security system with memory in transmitter and receiver

1991-08-21

1993-11-30

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082532, G06F 704

Patent

active

052669424

ABSTRACT:
A security system to defeat eavesdropping in a broadcast environment has at least one transmitter and at least one receiver. The transmitter includes a transmitter memory for storing a plurality of signals in a given sequence and a marker for identifying in the transmitter memory particular ones of the signals as invalid, as well as a broadcast-transmitter for transmitting in sequence at least a portion of those signals of the transmitter memory not identified as invalid. The receiver includes a receiver memory for storing a plurality of signals in a given sequence, and a marker for identifying in the receiver memory particular ones of the signals as invalid, as well as a broadcast-receiver for receiving signals transmitted by the transmitter. A receiver circuit in the receiver compares the signal received by the receiver with those signals of the receiver memory not identified as invalid, and, upon a successful comparison, both identifies the signal in the receiver memory as invalid thereafter and generates a successful comparison indicator.

REFERENCES:
patent: 4074066 (1978-02-01), Ehrsam et al.
patent: 4464651 (1984-08-01), Duhame
patent: 4535333 (1985-08-01), Twardowski
patent: 4596898 (1986-06-01), Pemmaraju
patent: 4607137 (1986-08-01), Jansen et al.
patent: 4677657 (1987-06-01), Nagata et al.
patent: 4750118 (1988-06-01), Heitschel et al.
patent: 4808995 (1989-02-01), Clark et al.
patent: 4853962 (1989-08-01), Brockman
patent: 4870683 (1989-09-01), Atalla

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