Abstract |
Fourier series provide a way of writing almost any signal as a
superposition of pure tones, or musical notes. But this representation
is not local, and does not reflect the way that music is actually generated
by instruments playing individual notes at different times. We will discuss
time-frequency representations, which are a type of local Fourier
representation of signals. This gives us a mathematical model for
representing music. While the model is crude for music, it is in fact
a powerful mathematical representation that has appeared widely throughout
mathematics (e.g., partial differential equations), physics (e.g., quantum
mechanics), and engineering (e.g., time-varying filtering). We ask one
very basic question: are the notes in this representation linearly independent?
This seemingly trivial question leads to surprising mathematical difficulties,
that we explore at different levels.
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