Title:
DIGITAL FILTER DESIGNING METHOD, DIGITAL FILTER DESIGNING PROGRAM, DIGITAL FILTER
Document Type and Number:
WIPO Patent Application WO/2004/008637
Kind Code:
A1
Abstract:
According to a basic unit filter having a predetermined basic numeric string as a filter coefficient, a high-pass unit filter (H15) and a low-pass unit filter (L13) having pass ranges having a common center frequency Fc are created. These are connected in the longitudinal way to design a band pass filter. Characteristic values obtained by combining a few types of unit filters are cancelled by each other. Thus, without pulling out a necessary frequency band and only by the longitudinal connection of the high-pass unit filter (H15) and the low-pass unit filter (L13), it is possible to extract a superimposed portion as a band pass filter pass range.
Inventors:
KOYANAGI YUKIO (JP)
Application Number:
PCT/JP2003/008922
Publication Date:
January 22, 2004
Filing Date:
July 14, 2003
Export Citation:
Assignee:
NEURO SOLUTION CORP (JP)
KOYANAGI YUKIO (JP)
KOYANAGI YUKIO (JP)
International Classes:
H03H17/02; H03H17/06; (IPC1-7): H03H17/06
Foreign References:
| JPS63269613A | 1988-11-07 | |||
| JPH06503450A | 1994-04-14 | |||
| JPH06326555A | 1994-11-25 | |||
| JPH05243908A | 1993-09-21 | |||
| JPS63103509A | 1988-05-09 |
Attorney, Agent or Firm:
Tachibana, Kazuyuki (Oaza-Shimoshingashi Kawagoe-shi, Saitama, JP)
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