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. 12, 1992
Filed:
Mar. 05, 1991
Francesco Orsino, North Babylon, NY (US);
Chung-Tao D Wang, Melville, NY (US);
AIL Systems, Inc., Deer Park, NY (US);
Abstract
Method and apparatus for processing on-line operands A, B and C to produce the arithmetic expression S=(A.times.B)+C. In general, the apparatus includes an input processing unit, an on-line multiplication unit, and an on-line serial addition unit. The input processing unit is sequentially introducing the digits of operands, A, B and C into the apparatus, where each digit is represented in a redundant binary number format. The multiplication unit multiplies the sequence of digits of the operands A and B to produce the n-th product digit p.sub.n of the product P=A.times.B, with the most significant digit p.sub.o being computed first. The on-line addition unit adds the n-th product digit to the n-th digit of on-line operand C, so as to produce the n-th digit s.sub.n of the arithmetic expression S=(A.times.B)+C, with the most significant digit s.sub.o being produced first. In one embodiment, the input processing unit includes a selective conversion subunit for selectively converting the digits of operands A, B and C sequentially entering the computational device, so that each digit is represented in a redundant number format. In such an embodiment, the redundant binary number format is characterized by signed digit numbers, and the selective conversion subunit includes a binary-to-signed digit converter.