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. 03, 1995
Filed:
Jul. 10, 1992
John H Guilford, Everett, WA (US);
Howard E Hilton, Snohomish, WA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A phase detector for symbol clock recovery in a digital communications system determines the phase error of a local symbol clock from the symbol rate of a transmitted signal by sampling the transmitted signal to obtain a first sample at a fraction of a symbol period after the symbol clock and to obtain a second sample at an equal fraction of a symbol period before the symbol clock, and determining a phase error equal to the difference between a function of the magnitude of the first sample and a function of the magnitude of the second sample. The function is preferably the square of the magnitude or the logarithm of the magnitude of the samples.