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:
Jan. 25, 2000
Filed:
Nov. 14, 1996
Mark Gonikberg, Santa Clara, CA (US);
Haixiang Liang, San Jose, CA (US);
Altocom, Inc., Mountain View, CA (US);
Abstract
A Finite Impulse Response (FIR) filter is implemented in software on a general purpose processor in a manner which reduces the number of memory accesses as compared to conventional methods. In particular, an efficient implementation for a general purpose processor having a substantial number of registers includes inner and outer loop code which together make ##EQU1## memory accesses and KN multiply-accumulates, where L.sub.1 is the number of output vector elements computed during each pass through the outer loop and where L.sub.2 is the number of taps per output vector element computed during each pass through the inner loop. The efficient implementation exploits L.sub.1 +2L.sub.2 general purpose registers. For an embodiment in which L.sub.1 =L.sub.2 =8, inner and outer loop code make ##EQU2## memory accesses, which for filter implementations with large numbers of taps, approaches a 4.times. reduction in the number of memory accesses as compared to conventional methods.