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Calcul scientifique Python Discussion :

Analyse segment d'attaque et segment de silence d'un fichier wave via fft


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Calcul scientifique Python

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    Par défaut Analyse segment d'attaque et segment de silence d'un fichier wave via fft
    Bonjour,

    Mon but est de sortir les segments d'attaque et de silence via la fft (Fast Fourier Transform)
    Mon code donne un tableau fft mais étant nul en math je ne sait pas comment interpréter ces données.

    tableau fft :
    Code : Sélectionner tout - Visualiser dans une fenêtre à part
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       1.11850831e+00 +8.53410213e+00j   4.11409512e+00 +1.00653415e+01j
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       1.75627692e+00 +1.07031366e+00j   1.20246485e+00 -5.32336100e+00j
       2.54436704e+00 -7.20902358e-01j  -2.12298614e+00 +2.77560521e+00j
       2.01320360e+00 -2.89368356e+00j   5.27516008e+00 -6.05882242e+00j
       3.31337227e+00 +1.63675242e+00j  -2.91702355e+00 -1.42013608e+00j
       8.20640761e+00 -1.92260528e+00j  -1.93395853e+00 +2.67477553e+00j
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       1.46968974e+00 +2.22257500e+00j   2.16282831e+00 -2.57327362e+00j
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       3.55981058e+00 -3.94312536e-02j   1.43371958e+00 -7.60824289e+00j
       1.32605411e+00 +1.69522232e+00j  -3.24264852e+00 +1.35654506e+00j
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       4.71331015e+00 +3.07752021e+00j  -1.73033058e+00 -9.79141462e-01j
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       7.70104609e-01 +4.73078613e+00j   1.53920009e+00 -3.09403729e+00j
       2.83821733e+00 -2.29489584e+00j  -1.34453759e+00 +3.92747759e+00j
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       4.42786162e+00 -1.54486081e+00j   2.30138078e+00 -1.34176711e-02j
      -2.29741360e+00 -1.33221948e+00j   3.67921738e+00 -2.26480045e+00j
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       4.63367291e+00 +2.26133829e-01j   5.30422947e+00 +1.63199107e+00j
      -2.90712778e+00 -1.24113490e+00j   3.87144674e+00 -2.55454789e+00j
      -1.11585069e-01 +5.86665542e+00j  -1.49370026e+00 -3.61571265e-01j
       2.17646396e+00 -1.81616385e+00j  -1.56772467e+00 +4.10701647e+00j
       1.81883612e+00 -1.41249783e+00j   7.41666103e+00 -2.56263581e+00j
      -2.75801951e+00 +6.54447520e-01j  -3.96154682e-01 -4.98207383e-01j
       5.48315462e+00 +1.35909067e+00j  -5.31106717e-01 -1.70135467e+00j
       1.88213782e+00 -1.61501049e+00j   4.23219538e+00 +1.16798696e+00j
       3.29467058e+00 -1.23190317e-01j  -3.93069983e+00 -6.24479348e+00j
       4.26578124e+00 +4.44593471e+00j   4.97532620e-01 +3.85347607e+00j
      -7.69979186e-01 -2.43907320e+00j   2.74709764e+00 +1.71013342e+00j
      -5.00532388e-01 +3.54116609e+00j   3.39657706e+00 -2.32773795e+00j
       2.36804565e+00 +1.86218758e+00j  -2.45873862e+00 -7.37966801e-01j
       5.54596872e+00 -2.06452651e+00j   1.48937818e+00 +3.32670400e-01j
      -4.46263235e+00 +2.94091108e-01j   6.26548010e+00 -2.73158180e+00j
       5.09632785e+00 +5.40726680e-01j  -7.60927167e-01 -2.01652278e+00j
       2.36276649e+00 -3.47672458e+00j   5.75502171e+00 +3.73107932e+00j
      -1.69759488e+00 -4.80652931e+00j   1.53317590e+00 -3.12030836e+00j
      -2.00710284e+00 +5.65512505e+00j   1.77828802e+00 -1.53797317e+00j
       3.47243095e+00 -7.15322268e+00j   7.48467881e-01 +8.11657099e-01j
       4.44514272e-01 -4.78837943e-01j   4.28537159e+00 -4.61704948e+00j
      -6.15863923e-01 +2.37019892e+00j  -3.56799257e+00 -8.76233268e-01j
       8.79629762e+00 -1.61800904e+00j   1.88656134e+00 +1.87760811e+00j
       1.90360808e-02 -9.46969941e-01j   4.45351752e+00 +3.69556646e+00j
       1.23506183e+00 -4.02728643e-01j   7.55720355e-01 -6.29721631e+00j
       3.44971069e+00 +2.25886964e+00j  -7.74342699e-01 +1.97155182e+00j
       1.19407661e+00 +1.44506825e+07j   1.86300940e+00 +6.12297237e-01j
      -5.75498450e-01 +4.06493179e+00j   3.75134099e+00 -4.74717309e+00j
       3.15243658e+00 +3.50781866e+00j  -2.65949595e+00 +4.47830713e-01j
       5.04967729e+00 -3.82427556e+00j   3.15250042e+00 +5.28945903e+00j]
    ce tableau est stocker via scipy.fft.fft(data)

    je sais en faire un spectre sonore mais je ne comprend pas comment analyser pas a pas (dans le temps) la variation des fréquences sonore.

    Merci pour vos lumières

  2. #2
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    Si vous voulez faire une analyse pas a pas dans le temps, il ne faut pas faire la transformée d'un seul coup.
    faites la petit bout par petit bout avec une 'fenêtre glissante', je croix que les bonnes tailles de fenêtres sont entre 20 et 50 ms (pas certain).
    Cela vous permettra de construire un spectrogramme, et donc d'avoir la fft a chaque instant t.

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