Method and apparatus for generating an equipment reply signal fo

Details Method and apparatus for generating an equipment reply signal fo Method and apparatus for generating an equipment reply signal fo

1981-03-10

1983-11-29

Malzahn, David H.

Excavating

34087016, 34082534, G06F 1100, G06K 701, H04Q 900

Patent

active

044184115

ABSTRACT:
Method and apparatus for generating an equipment reply signal for the automatic identification of objects and/or living beings, including a stationary interrogator having an energy transmitter, a receiver, an evaluator connected to the receiver, an opening code generator, and a first modulator connected to the energy transmitter, and a transponder fastened to the object or living being having a circuit unit with an energy receiver and converter, a code memory, a clock generator, a code transmitter, at least one antenna, an opening code receiver, an opening code memory, an opening code comparator connected to the opening code memory and the opening code receiver, a demodulator connected to the energy receiver and converter, and a second modulator connected to the demodulator, code transmitter, opening code transmitter and code memory, which includes radiating an opening code in the interrogator, storing the opening code in the transponder, radiating a code stored in the code memory by the code transmitter if the stored and radiated opening codes coincide, modulating a reply carrier signal on an energy wave with the first modulator, separating the reply carrier signal from the energy wave with the demodulator, modulating the reply signal carrier with the code with the second modulator, and radiating the modulated reply carrier signal as the reply signal with the code transmitter.

REFERENCES:
patent: 3679828 (1972-07-01), Becky
patent: 3813658 (1974-05-01), Rich, Jr.
patent: 3849633 (1974-11-01), Reitboeck et al.
patent: 4160522 (1979-07-01), Dikinis
patent: 4193061 (1980-03-01), Zoltai
patent: 4242663 (1980-12-01), Slobodin
patent: 4305060 (1981-12-01), Apple et al.

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