Title:
METHOD AND DEVICE FOR DESIGNING DIGITAL FILTER, PROGRAM FOR DESIGNING DIGITAL FILTER, DIGITAL FILTER, METHOD AND DEVICE FOR GENERATING NUMERICAL SEQUENCE OF DESIRED FREQUENCY CHARACTERISTICS, AND PROGRAM FOR GENERATING NUMERICAL SEQUENCE OF DESIRED FREQUENCY CHARACTERISTICS
Document Type and Number:
WIPO Patent Application WO/2005/104365
Kind Code:
A1
Abstract:
A standard function is inputted and an interpolation function of finite length is calculated therefrom. Then, the frequency characteristics of the interpolation function is shifted by a desired amount in the frequency axial direction, thereby determining input frequency characteristics based on specification. Filter coefficients are determined by performing inverse FFT of a numerical sequence representative of the input frequency characteristics and rounding is performed according to the coefficient values in order to obtain a smaller number of filter coefficients. Thus, it is possible to eliminate the need for windowing as an operation for decreasing the number of filter coefficients and easily design an FIR filter having desired frequency characteristics.
Inventors:
KOYANAGI YUKIO (JP)
Application Number:
PCT/JP2004/017667
Publication Date:
November 03, 2005
Filing Date:
November 22, 2004
Export Citation:
Assignee:
NEURO SOLUTION CORP (JP)
KOYANAGI YUKIO (JP)
KOYANAGI YUKIO (JP)
International Classes:
H03H17/06; (IPC1-7): H03H17/06
Foreign References:
| JP2003168958A | 2003-06-13 | |||
| JPH1083191A | 1998-03-31 | |||
| JP2000040942A | 2000-02-08 | |||
| JPH0715264A | 1995-01-17 | |||
| JPH0730348A | 1995-01-31 |
Attorney, Agent or Firm:
Tachibana, Kazuyuki (1-4 kojimach, Chiyoda-ku Tokyo, JP)
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