问如何判断两段音频的相似性？

EN

import matplotlib.pyplot as plt
import math

'''
create a test signal
'''

sr = 44100 #hz
freq = 200 #hz
duration = 0.1 #sec
signal = [math.sin(x * (math.pi * 2 * freq) * (1 / sr)) for x in range(0, int(sr * duration))]

'''
compute the auto correlation at a given frequency
'''
def auto_correlation(signal, freq, sr):
  sample_delay = int (sr / freq) 
  score = 0

  for i in range(0, len(signal) - sample_delay):
    score += signal[i] * signal[i + sample_delay]

  return score / len(signal)

'''
iterate over frequency spectrum and test the autocorrelation
'''
start_freq = 150
end_freq = 1000

scores = []
for freq in range(start_freq, end_freq):
  scores.append(auto_correlation(signal, freq, sr))
  
max_index = scores.index(max(scores))
print("estimated frequency : {} hz".format(max_index + start_freq))

plt.ylabel("correlation")
plt.xlabel("frequency Hz")
plt.plot([x + start_freq for x in range(len(scores))], scores)