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. 19, 1982
Filed:
May. 27, 1980
Applicant:
Inventor:
Vasil Uzunoglu, Ellicott City, MD (US);
Assignee:
Communications Satellite Corporation, Washington, DC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B / ; H03D / ;
U.S. Cl.
CPC ...
375 86 ; 375 97 ; 455 22 ; 455316 ; 3311 / ;
Abstract
A carrier recovery network for QPSK modems employs a synchronous oscillator which may be used as a frequency multiplier, divider and tracking bandpass filter. A preferred embodiment of the carrier recovery network includes a multiply-by-four circuit to remove QPSK data modulation, and a synchronous oscillator tuned to one-fourth the input frequency to thereby act as a frequency divider and tracking bandpass filter to provide a recovered carrier signal.