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:
Jul. 02, 1991
Filed:
Apr. 20, 1990
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A digital filter processing device includes at least a plurality of multipliers each for multiplying data signal by coefficient data, and an adder for adding together the multiplication results derived from the multipliers. The digital filter processing device further includes coefficient registers each for storing the coefficient data as is shifted so that a first effective digit of the coefficient data lies at the left end, shift-quantity registers provided in connection with the coefficient registers, and each for storing a quantity of shift equal to the shift quantity of the coefficient data, and barrel shifters each for shifting the digits of an output data from each of the multipliers by the shift quantity stored in each of the shift-quantity registers, in the opposite direction to that of the shift in each of the coefficient registers. The digital filter processing device may further include a second shift-quantity register for storing a second quantity of shift, and a second barrel shifter for shifting the digits of the output data of the adder by the second shift quantity.