fundamental tone

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fun·da·men·tal tone

the component of lowest frequency in a complex sound.
References in periodicals archive ?
In the first of three movements, the oscillations contain both fundamental tones and harmonics, almost like the sounds from a musical instrument.
The audio from most personal computers can't reproduce anything lower than 250Hz -- the equivalent of middle C on a piano, resulting in users missing half the fundamental tones of music in the sound coming from their desktop.

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