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:
May. 14, 1985
Filed:
Mar. 07, 1983
Duncan G Clark, Blackwater, Nr. Camberley, GB;
Ian D Kimber, Bracknell, GB;
Roderick G May, Wealdstone, GB;
EMI Limited, Hayes, GB;
Abstract
In a line network communication system coded data signals are transmitted on a base band carrier signal and are recovered in a receiver. The receiver includes an exclusive OR gate and a shift register which operate in conjunction to compare, during successive time intervals, a series of coded reference signals and a succession of received signals shifted in phase relative to one another by respective amounts to generate respective comparison signals forming a set. A control unit causes a change in the relative phases of compared signals until the value of a comparison signal in a set indicates a degree of correlation exceeding a threshold value. Then, in a tracking mode, the control unit monitors the values of comparison signals generated in successive sets to verify that a degree of correlation exceeding the threshold value persists. If the verification is successful the control unit, in a locking mode, adjusts the relative phases of the compared signals to maintain a desired degree of correlation.