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:
Jul. 07, 1998
Filed:
Dec. 08, 1995
Rudolf Turner, Hawthorn Woods, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A DC removal circuit for removing residual DC from a digitally encoded television signal including a plurality of multi level data symbols occurring at a constant symbol rate and formatted in repetitive data fields, each field including repetitive data segments having data segment sync of a fixed pattern of four symbols. A derived value of DC is subtracted from each of the received data symbols. The output of the subtractor is sampled, at the symbol rate or at one-half the symbol rate, and the sampled output is accumulated in an accumulator for generating the derived value. The sampling is continuous. The accumulator is preset to a zero value upon tuning to a different channel. An equalizer is supplied with the derived value of DC.