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Method and apparatus for detecting an EAS (electronic article surveillance) marker using wavelet transform signal processing

  • US 6,310,963 B1
  • Filed: 09/30/1994
  • Issued: 10/30/2001
  • Est. Priority Date: 09/30/1994
  • Status: Expired due to Term
First Claim
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1. A method of generating wavelet transform signals having mutually different phases, comprising the steps of:

  • receiving an input digital signal having a sampling frequency fs;

    performing a wavelet transform with respect to the received input digital signal to obtain a wavelet transform signal in a signal band of said input signal;

    subsampling said wavelet transform signal in said signal band by a factor of two to obtain a first phase wavelet transform signal having a first phase; and

    delaying said wavelet transform signal in said signal band by a sampling period corresponding to said sampling frequency fs and subsampling said delayed signal by a factor of two to obtain a second phase wavelet transform signal having a second phase that is different from said first phase.

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