| 摘要 |
<P>PROBLEM TO BE SOLVED: To make performance easier. <P>SOLUTION: A fixed frequency oscillation circuit 2 generates a fixed frequency electric signal showing a fixed-frequency wave having a frequency fixed. A variable frequency oscillation circuit 3 generates a variable-frequency electric signal showing a variable-frequency wave having a frequency varied on the basis of a floating capacity between a hand 12 and an antenna. A frequency difference circuit 5 generates a difference electric signal showing a difference frequency wave having a frequency which is the difference between the frequency of the fixed-frequency wave and that of the variable-frequency wave. A sound production circuit 6 generates a sound electric signal showing a sound waveform so that the frequency of the sound waveform is lower than the frequency of the difference frequency wave. Sound devices 7 and 8 generate sounds indicated by the sound waveform. In this case, an influence of variations in frequency of the fixed-frequency wave and the variable-frequency wave on a pitch of the sounds is small and adjustment of the fixed frequency oscillation circuit 2 and the variable frequency oscillation circuit 3 is unnecessary, so that a user can more easily play an electronic musical instrument. <P>COPYRIGHT: (C)2013,JPO&INPIT |
