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:
May. 30, 2006
Filed:
Aug. 29, 2002
I-hsien Lee, Kaohsiung, TW;
Cheng-shing Wu, Miaoli, TW;
An-yeu Wu, Taipei, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A method for implementing a multiplier-less FIR filter is disclosed, in which the FIR filter performs the convolution of where his the k-th coefficient of the FIR filter. The dynamic range of the filter coefficients is compressed by a transformation: where parameters α and β are chosen depending on filter type, −1≦α≦1, and m denotes iteration numbers of coefficient operation of transformation, so as to avoid the serious quantization error caused by the phenomenon of SPT distribution. Then, the compressed coefficients are quantized into SPT numbers, and the coefficients are optimized by removing redundant STP numbers.