| 摘要 |
PROBLEM TO BE SOLVED: To adjust a plurality of parameters of a digital mixer with one knob whose axial movement (depression state) can be detected as well as its rotating direction, and to control so that unintended change in the parameter is hardly caused when a user mistakes the operation in a depression state. SOLUTION: The HPF knob 20 normally adjusts the cutoff frequency of a high-pass filter of a digital mixer without reference to whether the knob is pressed. When, however, the HPF knob 20 is pressed and then rotated counterclockwise after the cutoff frequency reaches the lowest frequency, the high-pass filter is set into an off state. COPYRIGHT: (C)2008,JPO&INPIT
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