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Encoding system

  • US 4,972,471 A
  • Filed: 05/15/1989
  • Issued: 11/20/1990
  • Est. Priority Date: 05/15/1989
  • Status: Expired due to Fees
First Claim
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1. A method of encoding a given recorded signal made up of a host of frequencies, comprising:

  • modifying the recorded signal to selectively alter in a known manner a portion of said recorded signal to produce a machine recognizable start code which is generally imperceptible to normal human recognition when the recorded signal is played in its intended manner and analyzing said signal after said start code to generate an identity code based upon particular signal characteristics which collectively are unique to the original recorded signal and by means of which the recorded signal can be identified.

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