Finding an instrument's fingerprint
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Lecture 2a's seven recordings of middle C, each modelled as 15 harmonics of a fundamental f0. For any f0 the page makes a least-squares fit of the amplitudes, and plots the error against each kind of parameter. It has sound: use the play buttons.
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The demo runs in the frame below; it is self-contained, and nothing you do in it is recorded or graded. Open it in its own tab if you would rather have the whole window.