JPS5487520A - Electronic musical instrument - Google Patents

Abstract

PURPOSE: To automatically produce glissando effect tones by performing addition and substraction of key touch information based on the glissando control signals which subsequently addition change up to the specified value.

CONSTITUTION: The key code signals at the key touching from a key assigner cause an adder 20 to subsequently add the glissando control pulses, based on the key touch timings up to a specified value, according to the glissando control pulse priods outputted by a shift register 17 via shift register 16. This addition value becomes a carry signal and an adder 23 has the glissando control signals stored in shift register 25a... by each touched key channel, thereby controlling the key-on signals being applied to an adder 58. Hence, the adder 58 which is controlled of addition and subtraction via switch 10d generates the subsequently increasing or decreasing key code signals, which then address frequency information memory. As a result, the glissando tones which subsequently become high and low according to the touched key pitches are automatically formed and the glissando performance may be readily accomplished.

COPYRIGHT: (C)1979,JPO&Japio