Identification system

Details Identification system Identification system

1990-02-16

1992-11-24

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082534, H04Q 100

Patent

active

051666766

ABSTRACT:
A passive integrated transponder (PIT) is attached to or embedded in an item to be identified. It is excited via an inductive coupling from an interrogator. The PIT responds to the interrogator via the inductive coupling with a signal constituting a stream of data unique to the identified item. The signal is in the form of two different frequencies, a shift from one frequency to the second during a bit cell representing a data "one", and a shift from the second frequency to the first frequency representing a data "zero". The responsive signal is then detected and processed for utilization in a data storage or display device.

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Ray Ryan "Basic Digital Electronics", Tab Books, Blue Ridge Summit, Pa. pp. 52-55, 1975.

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