×

Copyright information embedding apparatus

  • US 5,960,398 A
  • Filed: 07/28/1997
  • Issued: 09/28/1999
  • Est. Priority Date: 07/31/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A copyright information embedding apparatus comprising:

  • A/D conversion means for converting an analog audio signal into a digital signal;

    modulation means for modulating a copyright data signal for said digital signal using spectrum spread;

    level detection means for detecting a variation in level of said digital signal; and

    a copyright data embedding circuit embedding the copyright data signal into the digital signal when the variation in level of said digital signal detected by said level detection means shows a preselected variation.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×