Abstract
The design of an electronic device that synthesizes and adds the low-order harmonics of a fundamental sine wave is described. Frequency and phase are digitally controlled to ensure stability, and amplitude is analog controlled. The harmonics are synthesized digitally and so the harmonic distortion is low (−48 dB). The device is used in the teaching laboratory of a course on the physics of music, where it shows clearly the effects of amplitude and phase of the spectral components on waveform and timbre. Because of the phase stability and low distortion inherent in the digital design, the device gives an effective demonstration of Fourier synthesis, and it is used as a lecture demonstration for students in introductory physics courses.
Published Version
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