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:
Feb. 07, 1995
Filed:
Dec. 07, 1992
Yoshitaka Hashimoto, Tokyo, JP;
Atsushi Kikuchi, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A two-dimensional noise shaping filter circuit including a first adder for adding a feedback signal to the input signal A quantizer is provided for quantizing an output from the first adder. A second adder adds an output from the quantizer to the output from the first adder. A transfer function unit provides an output from the second adder with a two-dimensional transfer function so as to generate the feedback signal to be supplied to the first adder. Using the noise shaping filter circuit, it becomes possible to provide a video signal with a two-dimensional noise shaping process, not only for a present line but also for a preceding line and a succeeding line. White noises caused by the quantizing process can be moved towards corners of a square Brillouin zone. Noise levels can be decreased at desired locations, such as at a portion of the center of a screen having a lower spatial frequency.