Electronic identification and recognition system with code changeable reactance
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United States of America Patent
Stats
-
Jun 14, 1983
Grant Date -
N/A
app pub date -
Sep 16, 1981
filing date -
Sep 16, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic identification and recognition system in which the recognition portion includes a voltage controlled oscillator which sweeps over a range of frequencies. The identification portion resonates at certain frequencies determined by a variable reactance in the resonant circuit in the identifier which is responsive to bits from a sequential data register. The bits result in the on-and-off switching of the variable reactance which modifies the resonant frequency in the identification portion or modifies the frequency of an oscillator in the identification portion. The changes and sequence of changes in the resonant frequency are detected and recorded by the recognition portion such that the internal code of the identifier is determined.
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