Convert WAV File to Spectrogram in Python3

To convert a .wav file to a spectrogram in python3, we can take the following steps −

• Load a .wav file from local machine.

• Compute a spectrogram with consecutive Fourier transforms using spectrogram() method.

• Create a pseudocolor plot with a non-regular rectangular grid using pcolormesh() method.

• Use imshow() method with spectrogram.

• To display the figure, use show() method.

Example

import matplotlib.pyplot as plt
from scipy import signal
from scipy.io import wavfile
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
sample_rate, samples = wavfile.read('test.wav')
frequencies, times, spectrogram = signal.spectrogram(samples, sample_rate)
plt.pcolormesh(times, frequencies, spectrogram, shading='flat')
plt.imshow(spectrogram)
plt.show()

Output