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Delayed offset multi-track OFC sensors and tags

  • US 7,825,805 B2
  • Filed: 02/07/2007
  • Issued: 11/02/2010
  • Est. Priority Date: 02/16/2006
  • Status: Active Grant
First Claim
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1. An orthogonal frequency coded device comprising:

  • a substrate;

    a transducer fabricated on said substrate; and

    plural acoustic tracks each having a bank of orthogonal frequency reflectors, the plural acoustic tracks coupled with the transducer, each acoustic track producing a different orthogonal code sequence with a different delay between a starting chip sequence in each of the different code sequences, the sum of the different code sequences forming an orthogonal coded signal having plural contiguous stepped orthogonal frequencies within a bandwidth for the device, wherein the plural acoustic tracks provide increased coding by including delays in the code sequences.

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