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Frequency Extractor using FFT (100% work but not filtered).py

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+# -*- coding: utf-8 -*-
+"""
+Created on Sun Mar 29 00:52:24 2020
+
+@author: aa
+"""
+from scipy.io import wavfile
+#import wave
+#import struct
+import numpy as np
+#first way to enter the wave file data (nframes + frame rate) using the wave lib
+#wave_file = wave.open("HH3.wav",'r')
+#nframes = wave_file.getnframes()
+#data = wave_file.readframes(nframes)
+#frate = wave_file.getframerate
+#wave_file.close()
+#data = struct.unpack('{n}h'.format(n=data_size), data)
+
+
+#second way to enter the wave file data (nframes + frame rate) using wavfile lib (100% work done but it is not filtered)
+fname = "test.wav"
+frate, data = wavfile.read(fname)
+
+
+data = np.array(data)
+w = np.fft.fft(data)
+freqs = np.fft.fftfreq(len(w))
+print(freqs.min(), freqs.max())
+# (-0.5, 0.499975)
+
+# Find the peak in the coefficients
+idx = np.argmax(np.abs(w))
+freq = freqs[idx]
+freq_in_hertz = abs(freq * frate)
+print(freq_in_hertz)
+# 439.8975 for the test.wav