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:
Aug. 05, 1997
Filed:
Dec. 16, 1994
Applicant:
Inventor:
Xiaonong Ran, Cupertino, CA (US);
Assignee:
National Semiconductor Corp., Santa Clara County, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341 51 ; 341107 ; 382247 ;
Abstract
A variable length coding process encodes a string of symbol values using arithmetic coding models selected according to the syntax of the string. The arithmetic coding models are optimized for each separate symbol in the string to provide efficient coding that provides a shorter average code length than is provided with arithmetic coding using a single model. In an embodiment for moving image coding, two sets of arithmetic coding models, one for intra frames and one for inter frames, are used for a series symbols representing DCT blocks. The model used for a symbol depends of the symbol's value and order in the series.