AUTOMATIC PERFORMING DEVICE OF PIANO

摘要

a microcomputer which includes a CPU and a memory storing a playing data and a program data; a PWM circuit for controlling the power of a key and pedal operating solenoid according to a velocity data of each key; a solenoid operating section, where the PWM circuit includes a clock oscillator; a clock control section; a keyboard counter for outputting the address of the key to be scanned according to the first frequency dividing signal; a velocity counter for sequentially outputting reference values of the keyboard velocity according to the second frequency dividing signal; a high-speed RAM; a comparator for comparing the velocity reference value of the velocity counter with the playing data of the high-speed RAM; a shift register, an output buffer connected to the solenoid operator; and a reset section for initializing the entire system.