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. 13, 1988
Filed:
Jul. 28, 1987
Applicant:
Inventors:
Joan L Mitchell, Ossining, NY (US);
William B Pennebaker, Carmel, NY (US);
Gerald Goertzel, White Plains, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341 51 ; 364748 ; 364857 ; 341 63 ; 341 75 ;
Abstract
A high speed form of finite precision binary arithmetic coding comprises encoding/decoding performed in the logarithm domain, resulting in facilitated computation based on additions and subtractions rather than multiplications and divisions. In encoding and decoding, antilogs are used which are retrieved from an antilog table. The antilog table is characterized by the following constraints to assure decodability wherein for any two mantissas .alpha. and .beta. representing respective inputs to the antilog table: