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:
Dec. 18, 1979
Filed:
Jun. 28, 1978
Applicant:
Inventor:
Roger Voles, London, GB;
Assignee:
E M I Limited, Hayes, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
332 / ; 178 / ; 325161 ; 332 26 ; 333150 ; 333187 ;
Abstract
A phase modulation system is described in which the phase of a carrier wave can assume one of a number of permitted values in each symbol period and wherein transitions between the permitted values occur at transition periods between symbol periods. Difficulties associated with phase transitions are reduced or overcome by storing or generating the transitions with a number of cycles of the carrier wave of the appropriate phase(s) on either side thereof, a wave train being built up by merging the corresponding oscillations of the same phase which succeed and preceed respectively two adjacent transitions.