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:
Mar. 25, 1980
Filed:
Jun. 19, 1978
James K Moore, Stamford, CT (US);
CBS Inc., New York, NY (US);
Abstract
Method and apparatus for eliminating deadband effects in digital recursive filters caused by rounding of the quantization of products within the filter, wherein the product is represented by a digital word, consists of truncating the absolute value of the product-representing word to the next lower digit by dropping a number of least significant digits determined by the value of the multiplier and if any of the dropped digits is a 'one', adding a least significant 'one' to the truncated number while retaining the sign of the pre-truncated word, and repeating the process at the cycling frequency of the filter, until a steady state is reached at which the difference between the input and output of the filter becomes zero. The concept is described as embodied in a digital system utilizing a recursive filter for reducing noise in a color television signal.