Rapid signal validity checking apparatus

Details Rapid signal validity checking apparatus Rapid signal validity checking apparatus

1988-01-28

1989-09-05

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307518, 328112, 328119, 377 33, 377 45, 371 55, H03K 526, H04B 110

Patent

active

048641588

ABSTRACT:
This invention relates to an improved signal reader for reading signals from transponders placed on moveable objects such as ship containers, automobiles or railroad cars. The reader sends out a continuous signal, which is modified by the information contained in the transponder attached to the moveable object. Multiple antennas, each of which receive separate signals, may be multiplexed at the reader. The improved circuit of the invention provides quick recognition of the receipt of a valid signal from a transponder or, in the alternative, the absence of such a valid signal.

REFERENCES:
patent: 3938146 (1976-02-01), Dano
patent: 3980960 (1976-09-01), Hutchinson
patent: 4068211 (1978-01-01), Van Tol
patent: 4169264 (1979-09-01), Parker
patent: 4197502 (1980-04-01), Summer et al.
patent: 4322686 (1982-03-01), Butin
patent: 4617677 (1986-10-01), Chiba
patent: 4627075 (1986-12-01), Fleming, III et al.
patent: 4739328 (1988-04-01), Koelle et al.

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