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System and method of watermarking signal

  • US 7,146,503 B1
  • Filed: 03/26/2002
  • Issued: 12/05/2006
  • Est. Priority Date: 06/04/2001
  • Status: Active Grant
First Claim
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1. A method of generating a watermarked signal, the method comprising:

  • (1) segmenting the signal into overlapping blocks using a window function;

    (2) for odd-numbered blocks, windowing each block using the window function; and

    (3) for even-numbered blocks;

    (a) transforming each block into a frequency domain;

    (b) modulating a phase of each block in the frequency domain by constraining the phase change inside a critical band to prevent an audible envelope change in a time signal;

    (c) transforming each modulated block in a time domain;

    (d) windowing each block transformed into the time domain; and

    (4) overlap-adding each odd-numbered block with each even-numbered block to generate the watermarked signal.

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