The continuous wavelet transform can be used to produce spectrograms which show the frequency content of sounds ~or other signals! as a function of time in a manner analogous to sheet music. While this technique is commonly used in the engineering community for signal analysis, the physics community has, in our opinion, remained relatively unaware of this development. Indeed, some find the very notion of frequency as a function of time troublesome.

AJP000794timefrequency.pdf

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