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Additive Synthesis of Harmonic Musical Tones
The imporance of harmonic tones in musical situations makes it highly desirable to be able to synthesize arbitrary harmonic spectra. the most flexible method for accomplishing this is by additive synthesis of the individual harmonic components. It is also necessary to have control over the time behaviors of the parameters which define a harmonic tone. Consequently, a solid-state additive synthesis device, called the Harmonic Tone Generator, has been constructed which generates an audio tone composed of six harmonics. The fundamental frequency (0 to 2400 Hz), the amplitudes of the individual harmonics and the second harmonic phase-shift are controlled independently by external voltages. Circuitry has also been built to provide independent harmonic amplitude control signals and for the actuation of sound events. The theory of separation of harmonic partials using ultrasonic frequencies is discussed.
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