The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2006
Filed:
Jan. 08, 2002
James Allen Stephens, Chandler, AZ (US);
Lam Tak Wing, Kowloon, HK;
James Allen Stephens, Chandler, AZ (US);
Lam Tak Wing, Kowloon, HK;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A signal detector for detecting a signal having a first nominal frequency, Fand a second nominal frequency F, the signal intermixed with an interfering signal to form a composite signal, the signal detector including a first and a second band pass filter centered at Fand Ffor filtering the composite signal to provide an Fand Fsignal; a parameter estimator for determining an Fand Fperiod for the Fand Fsignal for a sequence of frames and an average period shift (APS) for a current frame and a plurality of earlier frames; a metric calculator for calculating a metric that corresponds to the Fand Fperiod and the APS; and a decision processor for deciding whether the signal has been detected based in part on a comparison of the metric and a threshold.