| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a filter device capable of performing accurate tone setting or the like by smoothly changing coefficients of a cutoff frequency direction and a resonance direction. <P>SOLUTION: An interpolation operation part 50 in a filter coefficient setting part 20 finds out and sets the coefficient F of a filter operation part 30 by using four coefficients (F11, F12, F21, F22) corresponding to a cutoff frequency value (Fc) and a resonance value (Q) obtained by referring to a coefficient table 40. Since two-dimensional interpolation processing of the cutoff frequency direction and the resonance direction is performed, the filter device capable of performing accurate tone setting or the like by smoothly changing the coefficients of the cutoff frequency direction and the resonance direction can be provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
