Method of labelling a multi-frequency signal
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United States of America Patent
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Issued Date -
Sep 11, 2003
app pub date -
Dec 11, 2002
filing date -
Feb 2, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system for labelling and subsequently identifying a multi-frequency signal, includes means for inserting a code signal into a multi-frequency signal, signal distribution means, signal receiving means, code extraction means, and monitoring means to determine which parts of the frequency spectrum will at least partly mask the code signal at a given time using predetermined criteria. The means for inserting a code signal includes means for eliminating one or more frequency ranges being located in a part of the frequency spectrum that will at least partly mask the code signal, the location of the frequency ranges being eliminated from the said multi-frequency signal varies with the frequency content of said multi-frequency signal.
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