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. 26, 1991
Filed:
Jun. 22, 1990
Albert Macovski, Menlo Park, CA (US);
Other;
Abstract
The aspect ratio of a television system is increased by reducing the number of active lines in the vertical direction and using those lines to insert information for increasing the width of horizontal lines. The added information is superimposed at or near black level so that conventional receivers will merely see a shorter image without the increased width. To minimize the visibility of the added information, the high-energy low frequencies can be reduced. Alternatively the low frequency information for lengthening the horizontal lines can be placed in compressed form on either side of the normal horizontal lines without being seen on conventional receivers or used to modulate a high-frequency burst placed in the inactive lines. The increased aspect ratio receiver decodes the information in the inactive vertical lines, adds it to the decoded low frequency information, and displays it as an increased aspect ratio image in HDTV receivers. The decrease in vertical height and increase in horizontal width can provide approximately a 5/3 aspect ratio with significantly altering the height of the image on conventional receivers.