Rapid signal validity checking apparatus
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United States of America Patent
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Sep 5, 1989
Grant Date -
N/A
app pub date -
Jan 28, 1988
filing date -
Jan 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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