Effect imparting device in an electronic musical instrument

Abstract

Analog output signals of a key touch sensor and tonal effect setting manual operators are respectively time division multiplexed and thereafter are converted to digital signals by using an analog to digital converter on a time shared basis. The key touch sensor capable of detecting a key touch of a depressed key can also be used for obtaining an initial touch detection signal by additionally providing a device for holding a peak value of an output signal of the sensor at the beginning of depression of the key. Control factors of various tonal effects are controlled in response to these converted digital signals. Control factors of an attack pitch control effect are controlled in response to the key touch. In imparting a delay vibrato effect, the attack pitch control is automatically applied before the delay vibrato is initiated. In imparting a vibrato effect, the attack pitch control is automatically applied and the vibrato is applied thereafter if a key has been depressed in a staccato form. Selection as to whether a slur effect should be imparted or not is automatically made depending upon whether the key has been depressed in a legato form or not. A modulating signal for the vibrato is obtained by repeatedly calculating a numerical value setting the frequency of the modulating signal by a first calculator and repeatedly calculating a small value setting the amplitude of the modulating signal by a second calculator in response to a carryout signal of the first calculator.