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:
Nov. 29, 1994
Filed:
Feb. 14, 1992
Hatim Zagloul, Alberta, CA;
Michel Fattouche, Alberta, CA;
AGT Limited, , CA;
Abstract
A method and apparatus for estimating the phase differential of a transmitted electromagnetic signal from the amplitude envelope of the signal. The apparatus includes a sampler, phase estimator and demodulator. The phase estimator uses a Hilbert transform or an approximation of the Hilbert transform to estimate the phase differential. The method may be applied to time domain or frequency domain signals. The phase differential is estimated by taking the differential of a function of the envelope, and applying the Hilbert transform to this differential. The resulting phase differential, after correction for sign ambiguity may be used to demodulate the received signal.