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:
Dec. 23, 1986
Filed:
Jun. 29, 1984
Joseph L LoCicero, Riverside, IL (US);
Melih Pazarci, Chicago, IL (US);
Theodore S Rzeszewski, Lombard, IL (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
A television (TV) system having a fully compatible high-definition signal with extended aspect ratio information receivable at conventional resolution by conventional TV receivers without auxiliary apparatus with one TV channel carrying the conventional TV signal while high-frequency luminance and chrominance information plus extended aspect ratio information are provided in a second TV channel. The television system uses a video camera that produces the Y, I, and Q video signals with a bandwidth of 9.4 megahertz (MHz). These, Y, I, and Q signals have already been line decimated to 525 lines per frame with a scan rate of the standard 15.7 kiloherts (kHz). The resulting 63.5 microseconds line scan time comprises 42 microseconds of center information and 10.5 microseconds of edge information with 11 microseconds being allowed for the blanking and synchronization interval. The low-frequency center luminance and chrominance information is first time expanded and inserted into the first channel, and the high-frequency center chrominance and luminance information is time expanded and inserted into the second channel. The extended aspect ratio chrominance and luminance information is contained within the edge information and is transmitted during the horizontal retrace interval in the second TV channel.