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:
Jun. 05, 2001
Filed:
Dec. 31, 1998
Robert B. Staszewski, Garland, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A fast FIR filter,, a system, and a method that increases the operating speed of a filter. The system uses a high order numbering system, in particular Radix-8, and appropriate control lines, parallel data buses,and simple circuits for coefficient pre-multiplying. In a typical application, incoming high-speed unequalized 6-bit data are encoded into the high order numbering system, and placed on two data buses,, one containing the high order data bit stream, e.g., 4 bits for Radix-8, and the other the low order data bit stream, e.g., 3 bits for Radix-8. The data are further encoded in “hot-one” mode so that at all times exactly one bit is asserted. FIR coefficients are calculated, requiring pre-multiplication for only four non-trivial cases in the case of Radix-8 encoding: C, −C, 3C, and −3C, where C is a coefficient value. Because the coefficients do not change at high data rates, high-speed operation of pre-multiplication is not required. Further, by using the “hot-one” property incorporated in each bus, a simple low-propagational delay passgate multiplexer can be used for pre-multiplying.