Calcul fft d'un fichier wav
Bonjour,
Mon but est de coder en python un code qui cycliquement va faire un enregistrement en wav puis en extraire la fft.
La partie enregistrement en wav est faite. Je me casse maintenant les dents sur la fft.
N'étant pas un expert en mathématiques...
J'utilise la fonction scipy.fft, mais je n'arrive pas à interpréter les résultats (encore faudrait-il que j'utilise la fonction correctement, je n'en suis pas sur).
Voici la partie de code que j'utilise à partir d'un fichier wav que j'ai généré avec audacity.
Code:
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import wave, struct, os, numpy, scipy.io.wavfile, scipy
os.chdir("D:\Users\SEDASILV\Documents\ALEX")
rate, data = scipy.io.wavfile.read('sinus_400Hz_44100.wav')
ffttest = scipy.fft(data)
print(ffttest) |
J'obtiens donc ceci que je ne sais pas interpréter. Comment retrouver les fréquence la dedans. Je ne me souviens avoir appris une représentation complexe des harmoniques d'un signal:
Code:
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Merci pour vos lumières. J'ai du oublié mes cours :oops:
