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spectrogram — SciPy v1. 16. 2 Manual ShortTimeFFT is a newer STFT ISTFT implementation with more features also including a spectrogram method A comparison between the implementations can be found in the Short-Time Fourier Transform section of the SciPy User Guide
spectrogram — SciPy v1. 16. 2 Manual Calculate spectrogram or cross-spectrogram The spectrogram is the absolute square of the STFT, i e , it is abs(S[q,p])**2 for given S[q,p] and thus is always non-negative
ShortTimeFFT — SciPy v1. 16. 2 Manual Provide a parametrized discrete Short-time Fourier transform (stft) and its inverse (istft) The stft calculates sequential FFTs by sliding a window (win) over an input signal by hop increments
welch — SciPy v1. 16. 2 Manual P Welch, “The use of the fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms”, IEEE Trans Audio Electroacoust vol 15, pp 70-73, 1967
scipy. signal. spectrogram — SciPy v1. 8. 0 Manual Compute a spectrogram with consecutive Fourier transforms Spectrograms can be used as a way of visualizing the change of a nonstationary signal’s frequency content over time
chirp — SciPy v1. 16. 2 Manual The following four plots each show the short-time Fourier transform of a chirp ranging from 45 Hz to 5 Hz with different values for the parameter method (and vertex_zero):