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Additional information superimposition device

  • US 6,069,665 A
  • Filed: 05/27/1998
  • Issued: 05/30/2000
  • Est. Priority Date: 05/29/1997
  • Status: Expired due to Fees
First Claim
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1. An additional information signal superimposition device comprising:

  • spectral spread signal generation means for generating a spectral spread additional information signal by spectrally spreading an additional information signal;

    spectral spread signal detection means for detecting the spectral spread additional information signal superimposed on an input information signal; and

    superimposition means for receiving said spectral spread additional information signal from said spectral spread generation means and for additionally superimposing said spectral spread additional information signal on said input information signal when it is determined based on the detection result obtained by said spectral spread signal detection means that said spectral spread additional information signal is not superimposed on said input information signal to a predetermined threshold value of correlation.

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