| 摘要 |
PURPOSE:To preclude malfunction due to the resonance of a member which holds a sensor for detecting the operation of a musical performance operation element such as a key. CONSTITUTION:According to the count value of a counter 14, the output of the strain sensor 3 of each key which is outputted in order from a multiplexer 13 is amplified by a sensor amplifier 19 and converted by an A/D converter 20 into a digital value, which is then passed through a notch filter 21 to remove a signal component due to the resonance of the member holding the sensor 3; and the resulting signal is inputted to a microcomputer 15. The microcomputer 15 controls a sound source circuit 23 through an interface(I/F) circuit 22 on the basis of the digital value to generate a musical sound signal having the pitch corresponding to the key, and a speaker 24 sounds it. |
