Title:
DIGITAL FILTER DESIGN METHOD AND DEVICE, DIGITAL FILTER DESIGN PROGRAM, AND DIGITAL FILTER
Document Type and Number:
WIPO Patent Application WO/2005/078925
Kind Code:
A1
Abstract:
For example, more than one FIR-type basic filters having a symmetric sequence of numbers having a predetermined characteristic as a filter coefficient are combined and connected in longitudinal connection. The filter coefficient is calculated and for the y-bit data of the calculated filter coefficient, the lower bit is cut off for rounding so as to obtain a filter coefficient of x-bit (x < y). Thus, it is possible to significantly reduce an unnecessary filter coefficient without performing the conventional window multiplication. Moreover, it is possible to realize a digital filter having a desired frequency characteristic with a small circuit size and with a high accuracy without causing a truncation error attributed to window multiplication in the frequency characteristic.
Inventors:
KOYANAGI YUKIO (JP)
Application Number:
PCT/JP2004/015562
Publication Date:
August 25, 2005
Filing Date:
October 14, 2004
Export Citation:
Assignee:
NEURO SOLUTION CORP (JP)
KOYANAGI YUKIO (JP)
KOYANAGI YUKIO (JP)
International Classes:
H03H17/06; (IPC1-7): H03H17/06
Domestic Patent References:
| WO2003023960A1 | 2003-03-20 | |||
| WO2004008637A1 | 2004-01-22 |
Foreign References:
| JP2003168958A | 2003-06-13 | |||
| JP2002368584A | 2002-12-20 | |||
| JPS6282707A | 1987-04-16 | |||
| JPS635607A | 1988-01-11 | |||
| JPH07135448A | 1995-05-23 |
Attorney, Agent or Firm:
Tachibana, Kazuyuki (1-4 Kojimach, Chiyoda-ku Tokyo, JP)
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