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The Harmonic Tone Generator, a Voltage-Controlled Device for Additive Synthesis of Audio Harmonic Spectra

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A solid-state device has been constructed which generates an audio tone completely defined by its fundamental frequency, the amplitudes of its first six harmonics and second harmonic phase-shift. These parameters are controlled independently by external DC voltages. Hence, properties of musical tones, such as pitch, envelope, and timbre can be accurately programmed to produce a large variety of musical sounds.

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