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:
Oct. 06, 1998
Filed:
May. 13, 1997
Philippe Levionnais, Caen, FR;
France Telecom, Paris, FR;
La Poste, Boulogne Billancourt Cedex, FR;
Abstract
The demodulator is for processing a signal having a carrier modulated by (0, .pi.) phase shifts and sampled at a rate that is at least twice the frequency of the carrier co. It comprises, in cascade: a first multiplier for squaring successive samples e(t), a phase locked loop adjusted to the frequency of the carrier, thereby performing programmable digital filtering; a divider for dividing the frequency by two, reconstituting the carrier from the output of the phase locked loop; a second multiplier receiving the sampled input signal and the output signal from the divider and an output lowpass digital filter. A phase adjustment circuit is placed upstream of one of the inputs of the second multiplier.