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:
Jan. 28, 1997
Filed:
Oct. 26, 1994
Tetsu Nagamatsu, Kawasaki, JP;
Lee-Sup Kim, Dongdaemoon-Ku, KR;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A discrete cosine transform processor for executing discrete cosine transform calculations in both forward and inverse directions on the basis of previously stored product addition data has a memory having a first memory section for storing product addition calculation data for the forward direction transformation and a second memory section for storing product addition calculation data for the inverse direction transformation other than data in common to those stored in the first memory section; and sign inverter for inverting signs of the data used in common for the inverse direction transformation, among the data stored in the first memory section. The memory preferably includes first memory for storing product addition data corresponding to even-order coefficients and second memory for storing product addition data corresponding to odd-order coefficients; and only the second memory stores data used in common for both the forward and inverse direction transformations in the first memory thereof.