Security system for a solid state device

Details Security system for a solid state device Security system for a solid state device

1976-01-14

1979-02-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358114, 364709, 361172, H04N 544, G06F 100

Patent

active

041398645

ABSTRACT:
The security system is adapted to be utilized in conjunction with a device such as an electronic calculator having solid state circuit elements formed on chips wherein the elements perform predetermined functions. The system comprises a gate formed on one of the chips for interconnecting at least two of the circuit elements in response to an enable signal. A data generator is provided and an encoding device encodes the data from the data generator as a sequence of binary signals. A reference encoder generates a preselected sequence of binary signals. A comparing device is connected to the encoding device and the reference encoder and is operable to generate and apply the enable signal to the gate when the sequence of signals from the encoding device matches the preselected sequence of signals from the reference encoder.

REFERENCES:
patent: 3831065 (1974-08-01), Martin et al.
patent: 3886307 (1975-05-01), Evans et al.
Gernsback, "An Open Letter to the Radio Industry," Radio-Craft, p. 155, Sep. 1938.
Ellis, Science and Mechanics, vol. 36, No. 3, Mar. 1965.

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