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:
Nov. 15, 1988
Filed:
Aug. 29, 1986
Charles D Thompson, Austin, TX (US);
Joseph P Gergen, Austin, TX (US);
Bradley Martin, Austin, TX (US);
Garth D Hillman, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A filter structure uses multiple discrete filter circuits which are cascaded to provide a multiple tap filter of programmable tap length. In one form, an FIR filter may be implemented wherein each circuit generates partial sum operands which must be added to provide a filter output. The cascaded circuits perform partial addition operations near simultaneously by using a serial addition which is synchronized with a start bit. The number of taps in the filter structure implemented by the cascaded discrete filter circuits is variable and may be programmed with a programmable storage register in each discrete circuit which stores operand data fixing the tap length of each discrete circuit. The multiple filter circuits provide a single filter structure with a large tap length and high sampling rate.