from scipy.io import wavfile
import numpy as np
import matplotlib.pyplot as plt

srate, data = wavfile.read("nasty.wav")
data = data.flatten()

for i in range(1, len(data)):
    data[i] = data[i-1] - data[i]

plt.hist(data, range=(-2**23, 2**23), bins=128)
plt.show()