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. 24, 1990
Filed:
Sep. 19, 1986
Ron D Katznelson, San Diego, CA (US);
M/A-COM Government Systems, Inc., San Diego, CA (US);
Cable/Home Communication Corp., San Diego, CA (US);
Abstract
Extended horizontal definition is provided in a television system in which the wideband and narrowband chrominance components of a video signal are modulated for transmission by a subcarrier. The modulated wideband I chrominance component is filtered over a bandwidth that is antisymmetrical about the subcarrier frequency with an extended upper sideband to thereby entend the bandwidth that is available for transmission of the I chrominance component. The modulated I chrominance component is antisymmetrically filtered to enhance the relative amplitude in the extended portion of the upper sideband for transmission, and in a television receiver the modulated I chrominance component of a received video signal is filtered to have a relatively flat-response over the antisymmetrical bandwidth about the subcarrier frequency. Alternatively, the antisymmetrical filtering of the modulated I chrominance component to enhance the relative amplitude in the extended portion of the upper sideband may take place in the receiver. The I chrominance component is filtered prior to modulation over a bandwidth defined by 2.4 MHz above the subcarrier frequency and 1.5 MHz below the subcarrier frequency. The narrowband Q chrominance component is filtered prior to modulation over a bandwidth defined by 1.5 MHz above and below the subcarrier frequency.