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Simultaneous transmission of data and audio signals by means of perceptual coding

  • US 5,473,631 A
  • Filed: 03/27/1995
  • Issued: 12/05/1995
  • Est. Priority Date: 04/08/1994
  • Status: Expired due to Term
First Claim
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1. Apparatus for encoding a data signal to be transmitted simultaneously with an audio signal such that said encoded data signal is masked by said audio signal, the apparatus comprising:

  • means for monitoring said audio signal to determine a perceptual entropy envelope thereof, said monitoring means generating at least one control signal indicative of said detected perceptual entropy envelope;

    means responsive to said at least one control signal for encoding said data signal and for transmitting said encoded data signal at times, frequencies and levels falling within said detected perceptual entropy envelope of said audio signal such that when combined with said audio signal, said transmitted encoded data signal is masked by said audio signal; and

    means for combining said audio signal with said transmitted encoded data signal to form a composite signal.

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