Musical sound generating system with burst signals

Abstract

Abstract A MUSICAL SOUND GENERATING SYSTEM FOR AN ELECTRONIC MUSICAL INSTRUMENT WHICH COMPRISES A MASTER OSCILLATOR FOR PRODUCING A SIGNAL HAVING A FREQUENCY WHICH IS INTERGRAL MULTIPLES OF A FUNDAMENTAL FREQUENCY DEFINING THE PITCH OF A MUSICAL SOUND TO BE SYNTHESIZED. THE MASTER OSCILLATOR OUTPUT FREQUENCY IS DIVIDED BY A FREQUENCY DIVIDER TO OBTAIN A SIGNAL OF THE FUNDAMENTAL FREQUENCY. THE DIVIDER OUTPUT TRIGGERS AN OSCILLATOR TO CAUSE OSCILLATION WHICH IS CONTAINUED DURING A DESIRED LENGTH OF TIME WITHIN THE PERIOD OF THE FUNDAMENTAL FREQUENCY. THE TRIGGER OSCILLATOR OPERATES AT A FREQUENCY DEVIATED FROM THE MASTER OSCILLATOR FREQUENCY BY A DESIRED FORMANT FREQUENCY ASSOCIATED WITH THE MUSICAL SOUND TO BE SYNTHESIZED. THE OUTPUTS OF THE MASTER AND TRIGGER OSCILLATORS ARE COUPLED TO A FREQUENCY CONVERTER OR AMPLITUDE MODULATOR TO PRODUCE A SIGNAL OF THE FORMANT FREQUENCY OR DIFFERENCE FREQUENCY BETWEEN MASTER AND TRIGGER OUTPUT FREQUENCIES. THE OUTPUT OF THE FREQUENCY CONVERTER IS THEN COUPLED TO A LOW PASS FILTER TO PRODUCE AT THE OUTPUT THEREOF A BURST SIGNAL HAVING THE INSTANTANEOUS FREQUENCY OF THE FORMANT FREQUENCY. THE FREQUENCY SPECTRUM ENVELOPE OF THE BURST SIGNAL HAS A MAXIMUM VALUE AT THE FORMANT FREQUENCY.

Inventors

• 👤 A Kameoka
• 👤 S Nakamura

Bibliographic Details