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:
Aug. 31, 2004
Filed:
Dec. 23, 1997
Patrik Larsson, Matawan, NJ (US);
Christopher John Nicol, Red Bank, NJ (US);
Agere Systems, Inc., Allentown, PA (US);
Abstract
Multiported register files used for storing coefficients in adaptive FIR are improved upon by implementing a split memory architecture that has the ability to separately control the least significant bits and the most significant bits of coefficient values that are stored in the filter. When the filter is operated to use so-called “burst mode” updating, the updating circuitry of the filter can be disabled and only the most significant bits of the coefficients are read out from the multiported register file while the least significant bits remain unchanged. This conserves power without sacrificing precision, since only certain ones of the bits of the coefficients are used in the multiplication of the sample. In addition, when only the most significant bits of the coefficients are being cycled through the register filter, any changing bits are prevented from being supplied to the updating circuit, so that the updating circuit performs no computation at all, rather than performing one that is discarded. Advantageously, using such improved multiported register files, adaptive FIR filters can be constructed which operate with lower power consumption.