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. 30, 1993
Filed:
Apr. 03, 1992
Kannan Ramchandran, Belle Harbor, NY (US);
Kamil M Uz, Plainsboro, NJ (US);
Martin F Vetterli, New York, NY (US);
The Trustees of Columbia University in the City of New York, New York, NY (US);
Abstract
In a digital TV broadcast system, an embedded multiresolution scheme implementing joint source/channel coding is employed to offer at least relatively fine and relatively coarse resolution services. The relatively fine resolution service is intended for receivers within a first radius of a TV signal transmitter and the relatively coarse resolution service is intended for receivers between the first radius and a second, longer radius thereof. Video signals broadcast from the transmitter represent individual signal points which are selected from a signal constellation. The latter comprises signal-point groups each including a multiplicity of the signal points. The selected signal points represent video images in the relatively fine resolution, while the signal-point groups from which the selected signal points originate represent the relatively coarse version of the images. The relative length of the first radius to the second radius is a function of the ratio of the interdistance of two neighboring signal points within a signal-point group to the interdistance of two neighboring signal-point groups in the signal constellation.