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:
Nov. 27, 1990
Filed:
May. 31, 1989
Applicant:
Inventor:
Dietmar Ehrhardt, Siegen, DE;
Assignee:
Deutsche ITT Industries GmbH, Freiburg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358198 ; 358197 ;
Abstract
A color television channel that includes a video channel and at least one sound channel is converted by means of a low-IF converter from the RF band directly to the baseband by analog quadrature conversion. The quadrature output signals are digitized. A correcting stage eliminates the quadrature errors and forms a corrected quadrature pair which drives a video stage and a sound conversion stage. The sound conversion stage includes at least one sound channel converter which converts the low-IF sound channel to its baseband by another (digital) quadrature conversion.