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:
Feb. 20, 2001
Filed:
Dec. 16, 1998
Hiroki Shinde, Kawasaki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A digital filter according to the invention is an x-time interpolation (x is an interpolation ratio) type FIR filter. The digital filter is provided with a plurality of stages of delay elements into which serial data are inputted, and a plurality of data distributors which distribute the respective output data of the plurality of stages of delay elements into x different signal channels by a time-sharing system. The respective data distributors operate a rate higher by x times than the input rate of serial data and distribute data into x different channels by time-sharing. Preferably, by utilizing the symmetry of a digital filter coefficients, only the digital filter coefficients corresponding to the half taps at one side of the digital filter are prepared, wherein the respective output data of a pair of delay elements located at the symmetrical positions are inputted into one data distributor, and the respective data are distributed by a time-sharing system.