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. 25, 1986
Filed:
Feb. 21, 1985
Applicant:
Inventor:
Robert J Snyder, Westford, MA (US);
Assignee:
Wang Laboratories, Inc., Lowell, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375 46 ; 375 45 ; 375 48 ; 375 62 ; 375 66 ; 332 / ; 331179 ;
Abstract
A data signal is encoded as frequency modulation by selecting carrier sources of different phases in response to data signals and filtering the resultant wave to produce an output deviating from the carrier frequency for one signal time in response to a single shift of phase. A phasing switch stores a record of the last sent phase and a record of the parity value of the number of zeros sent. The selected phase is as last sent for a 0, advanced for a 1 when the zero parity is of one value, and retarded when the zero parity is of another value.