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. 16, 1995
Filed:
Aug. 13, 1993
Toshiyuki Sato, Tokyo, JP;
George Sakamoto, Tokyo, JP;
Morikuni Takigawa, Kagoshima, JP;
Hirotoki Kawasaki, Tokyo, JP;
D F C Co., Ltd., Tokyo, JP;
Abstract
A filter-coefficient conversion system relating to n pieces of digital filters for obtaining n pieces of frequency components in a desired frequency band using filter coefficients a(i, j) (where i=0, - - - m.sub.j, j=1, - - - n) described in a given filter-bank table, comprising a first transfer-function processing device for obtaining transfer functions H(a(i, j)) for the filter coefficients a(i, j) corresponding to each filter (j) in a desired frequency band, a variable-range generating device for generating gradually value-changing ranges RANGE (m), a second transfer-function processing device for obtaining new converted filter coefficients A (i, j) having rounded integer values based on the filter coefficients a (i, j) in the filter-bank table, preparing a filter-bank table thereof, and obtaining transfer functions H(A (i. j)) for the converted filter coefficients A (i, j), and an evaluating device for carrying out evaluation processing with respect to a given degree of tolerance.