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. 07, 1986
Filed:
Jul. 16, 1984
Leonard N Schiff, Lawrence Township, Mercer County, NJ (US);
RCA Corporation, Princeton, NJ (US);
Abstract
A system is described in which the audio subcarrier components are attenuated relative to the other components of composite television signals by an inexpensive IF filter. This filter incidentally produces quadrature distortion between the two color difference signal components of the composite television signals. The disclosed invention includes a differentiator, responsive to at least one of the color difference signals, that derives signals proportional to the quadrature distortion components present in the other color difference signal. These distortion components are then subtracted from the other color difference signal to produce a signal that is substantially free of quadrature distortion. The differentiator and subtracter are advantageously realized in the form of a simple FIR filter.