Patent Number: 6,400,935

Title: Pilot tone detector

Abstract: An apparatus and method for detecting the presence of a signal component in an arbitrary signal, where the signal component has a desired frequency. The apparatus includes an error signal generator and a detector. The error signal generator has an input for receiving a reference signal having a reference frequency, a second input for receiving the arbitrary signal having the signal component and an output for generating a difference signal dependent upon a difference in frequency between the reference frequency and the desired frequency. The detector has an input for receiving the difference signal and an output for producing a detector signal when the magnitude of the difference signal is greater than a threshold magnitude. The detector signal indicates the presence of the signal component in the arbitrary signal.

Inventors: Williams; Robby Gordon (Calgary, CA)

Assignee: Nortel Networks Limited

International Classification: H04B 1/10 (20060101); H04B 001/06 ()

Expiration Date: 06/04/2019