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:
Apr. 23, 1996
Filed:
Nov. 30, 1993
Stuart W Flockencier, Cedar Hill, TX (US);
Loral Vought Systems Corporation, Grand Prairie, TX (US);
Abstract
A Finite Impulse Response (FIR) digital signal processing circuit uses a double-accumulator technique to drastically reduce the number of multiply-accumulate operations which are necessary per sample of input data. The amount of reduction is dependent upon the shape of the filter function to be convolved. A double-accumulator (D-A) can be implemented by first providing a set of D-A coefficients, which are derived from the filter coefficient stream (FCS). Each D-A coefficient is multiplied by a separate input data sample. The products are summed together along with the result of a previous multiplication of the same D-A coefficients with different input data samples. This first sum is added to another number to form a second sum. The other number is the previous value of the second sum. The second sum is the result. The derived D-A coefficients are fewer and simpler than that required by the conventional FIR implementation. Since multipliers are complex, costly, bulky and limited in speed, the D-A method can lessen these constraints.