## Short-Time-Fourier-Transform

We Fourier transform the time series data using a Fourier transform, with some window function

$$\tilde Y[n,k] = \sum_m Y[n+m] W[m] e^{-i \lambda_k m},$$

where $\lambda_k=2\pi k/N$ and $W[m]$ is the window function at $m$.

1. Cousera

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