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:
Jan. 19, 1982
Filed:
Sep. 19, 1979
Applicant:
Inventor:
Richard LaRosa, South Hempstead, NY (US);
Assignee:
Hazeltine Corporation, Greenlawn, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03C / ; H03K / ;
U.S. Cl.
CPC ...
332 / ; 332 / ; 375 45 ; 375 62 ;
Abstract
An improved constant-envelope, angle-modulated pulse signal generator makes use of first and second bi-phase amplitude modulators, each for modulating a carrier with supplied pulse signals. The pulse signals are representative of information and are interleaved with each other. The pulse duration is selected to cause a suitable amount of pulse overlap. When the modulated carriers are combined in phase quadrature and passed through a surface acoustic wave filter, they form a constant envelope signal. Appropriate selection of parameters can yield a sinusoidal frequency shift keyed (SFSK) signal.