×

Adaptive carrier detection

  • US 5,260,974 A
  • Filed: 05/10/1991
  • Issued: 11/09/1993
  • Est. Priority Date: 05/10/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. In an apparatus using a carrier detection threshold level for detecting a carrier signal modulated with binary data and where said apparatus has a background noise level when said carrier signal is not present, an improvement comprising:

  • first means for lowering said threshold level when said threshold level is greater than said background noise level; and

    ,second means for raising said threshold level when said threshold level is less than said background noise level, said second means including evaluation means for determining whether a detected signal containing data or only background noise is present; and

    said evaluation means determining the magnitude and phase of said detected signal and from said magnitude and phase determines the likelihood that said detected signal is data or only background noise.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×