python - How to use signal.spectrogram?

Question

So I'm trying to plot a spectrogram, but I want the frequency in periods. I tried doing freqs = 1./freqs, as below in code, but I got the wrong spectrogram, as shown in image:

from scipy import signal
import numpy as np
import matplotlib.pyplot as plt

freqs, times, Sx = signal.spectrogram(data, fs=1, window='hanning', mode='magnitude')

f, ax = plt.subplots(figsize=(25, 25))

freqs = 1./freqs
freqs = np.nan_to_num(freqs)

ax.pcolormesh(times, freqs, Sx, cmap='viridis', shading='auto')

What can be done?

question from:https://stackoverflow.com/questions/65948251/how-to-use-signal-spectrogram

Answer 1

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