TONE AND TIME CONTROL OF ELECTRONIC MUSICAL INSTRUMENT

摘要

An electronic organ uses key switches having two fold contactor and pedal switches having slide volume to control the tone and rythm. The contact time difference between two contactors which depends the strength of power and pressing speed is divided by 8 stages in a decoder. the corresponding stage is compared with data stored in the microprocessor, and provided to the rythm generator and the D/A converter. The analog signal passed through the D/A converter is provided to the rythm genernetor to control the tone. the duration of sound is depended on the pressing time of the pedal switch.