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:
May. 14, 1996
Filed:
Jun. 22, 1994
Tomoo Yamashita, Moriguchi, JP;
Yorihiko Wakayama, Katano, JP;
Akio Nishimura, Sakai, JP;
Teiji Nishizawa, Ikoma, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The alpha blending calculator of the invention executes an alpha blending calculation in accordance with digital data X, Y, and .alpha.. The alpha blending calculator includes multiplexers which select one of X or Y in accordance with bits of the digital data .alpha., respectively, and a calculating section for shifting outputs of the multiplexers by a predetermined number of bits, respectively, and for calculating a sum of the shifted outputs. The calculating section includes first level to Nth level adding portions, and an adder connected to the outputs of the Nth level adding portion for executing a multi-bit addition. Each of the first level to the Nth level adding portions receives a plurality of stages of data, classifies the plurality of stages of data into quotient groups and a remainder group, calculates a sum and a carry for each of the quotient groups, and outputs the sum, the carry, and the stages of data in the remainder group to the next level adding portion. The outputs of the multiplexers are input as the plurality of stages of data to the first level adding portion, and the outputs of the Nth level adding portion consist of a sum and a carry.