| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate deviation of a starting frequency at the time of boosting and cutting in a tone control circuit. <P>SOLUTION: Components each having a specified frequency band whose original sound signal is different from each other are to be extracted by a boosting filter 202 and a cutting filter 204, then an extracted signal can be acquired. Any one of two extracted signals is to be selected by a selector 206 based on boosting or cutting, then a sound range adjusting signal is to be produced by performing an attenuation process by an adjusting circuit 210 about the selected extracted signal. A synthesizing circuit 212 switches whether which sound adjusting signals acquired from any one of the two extracted signals are to be used when the sound adjusting signal is to be added or to be subtracted. <P>COPYRIGHT: (C)2009,JPO&INPIT |
