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. 11, 2014
Filed:
Nov. 02, 2010
Motonobu Tonomura, Tokyo, JP;
Kyouji Yoshino, Tokyo, JP;
Motonobu Tonomura, Tokyo, JP;
Kyouji Yoshino, Tokyo, JP;
DAI Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
Interpolation of signed values A and B is efficiently performed by simple circuitry. To calculate an interpolated value C based on a 4-bit values A (bits aaaa) and B (bits bbbb) expressing a negative number by twos complement notation and a 4-bit interpolation rate D (bits dddd) consisting of only a decimal part, a basic expression of C=(1−D)*A+D*B is transformed into an expression composed of an unsigned part that includes a sum of products with a bit dor a logically inverted value eof the bit d(i=0, 1, 2, and 3), and indicates an absolute value of the interpolated value C, and a signed part indicating a sign of the interpolated value C. Then, 7 bits of bits cthrough care generated from an arithmetic operation of the unsigned part, and logic judgement of the signed part is performed by considering a carry from the digit of the bit cof the arithmetic operation of the unsigned part to generate a bit c. Significant digits of the obtained 8-bit value (bits cthrough c) are outputted as an interpolated value.