Discussion :

[Toug19]

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 :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
 
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 :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
-4.00000000e+00 +0.00000000e+00j   3.15250042e+00 -5.28945903e+00j
   5.04967729e+00 +3.82427557e+00j  -2.65949595e+00 -4.47830713e-01j
   3.15243658e+00 -3.50781866e+00j   3.75134099e+00 +4.74717309e+00j
  -5.75498450e-01 -4.06493179e+00j   1.86300940e+00 -6.12297237e-01j
   1.19407655e+00 -1.44506825e+07j  -7.74342699e-01 -1.97155182e+00j
   3.44971070e+00 -2.25886963e+00j   7.55720355e-01 +6.29721631e+00j
   1.23506183e+00 +4.02728643e-01j   4.45351752e+00 -3.69556646e+00j
   1.90360830e-02 +9.46969934e-01j   1.88656134e+00 -1.87760811e+00j
   8.79629762e+00 +1.61800904e+00j  -3.56799257e+00 +8.76233268e-01j
  -6.15863923e-01 -2.37019892e+00j   4.28537159e+00 +4.61704948e+00j
   4.44514271e-01 +4.78837940e-01j   7.48467881e-01 -8.11657099e-01j
   3.47243095e+00 +7.15322268e+00j   1.77828802e+00 +1.53797317e+00j
  -2.00710284e+00 -5.65512505e+00j   1.53317590e+00 +3.12030836e+00j
  -1.69759488e+00 +4.80652929e+00j   5.75502171e+00 -3.73107932e+00j
   2.36276649e+00 +3.47672459e+00j  -7.60927167e-01 +2.01652278e+00j
   5.09632785e+00 -5.40726680e-01j   6.26548010e+00 +2.73158180e+00j
  -4.46263235e+00 -2.94091110e-01j   1.48937818e+00 -3.32670400e-01j
   5.54596872e+00 +2.06452651e+00j  -2.45873862e+00 +7.37966801e-01j
   2.36804565e+00 -1.86218758e+00j   3.39657706e+00 +2.32773795e+00j
  -5.00532388e-01 -3.54116609e+00j   2.74709764e+00 -1.71013342e+00j
  -7.69979186e-01 +2.43907320e+00j   4.97532620e-01 -3.85347607e+00j
   4.26578124e+00 -4.44593471e+00j  -3.93069983e+00 +6.24479348e+00j
   3.29467058e+00 +1.23190308e-01j   4.23219538e+00 -1.16798696e+00j
   1.88213781e+00 +1.61501049e+00j  -5.31106717e-01 +1.70135467e+00j
   5.48315462e+00 -1.35909067e+00j  -3.96154682e-01 +4.98207383e-01j
  -2.75801951e+00 -6.54447521e-01j   7.41666103e+00 +2.56263581e+00j
   1.81883612e+00 +1.41249783e+00j  -1.56772467e+00 -4.10701647e+00j
   2.17646396e+00 +1.81616385e+00j  -1.49370026e+00 +3.61571265e-01j
  -1.11585069e-01 -5.86665543e+00j   3.87144674e+00 +2.55454789e+00j
  -2.90712778e+00 +1.24113490e+00j   5.30422947e+00 -1.63199107e+00j
   4.63367291e+00 -2.26133829e-01j  -1.86724455e+00 +7.78461504e-01j
   3.54226349e+00 +5.36119987e-01j   3.67921738e+00 +2.26480045e+00j
  -2.29741361e+00 +1.33221949e+00j   2.30138078e+00 +1.34176711e-02j
   4.42786162e+00 +1.54486081e+00j  -2.87637028e+00 -5.76121673e-01j
   2.63983216e+00 -6.62947757e-01j   5.08680688e+00 +3.35356756e+00j
  -1.24604984e+00 -2.74004476e+00j   2.51875413e+00 -1.40487502e+00j
   1.84061227e+00 +5.37144514e+00j   1.07633640e+00 -1.42361549e+00j
   3.81200013e+00 -2.24298709e+00j   3.12891841e-01 +4.92329497e+00j
   5.34030066e-01 +4.41858752e-01j   5.71978168e+00 -2.24134791e+00j
  -1.56693898e+00 +2.30866899e+00j  -7.69606174e-01 +9.55496358e-02j
   6.81097361e+00 +2.71976518e-01j   5.55682885e-01 +7.41771159e-01j
  -1.40765495e+00 -1.72098609e+00j   5.80013657e+00 +1.82333361e+00j
   1.29517635e+00 +1.50719848e+00j  -1.34453759e+00 -3.92747759e+00j
   2.83821733e+00 +2.29489584e+00j   1.53920009e+00 +3.09403729e+00j
   7.70104608e-01 -4.73078613e+00j   1.08122204e+00 +2.86208680e+00j
   1.09678522e+00 +4.20393097e+00j   3.50258757e+00 -2.63485069e+00j
   2.95444423e+00 +6.83800060e-01j  -1.73033058e+00 +9.79141462e-01j
   4.71331015e+00 -3.07752021e+00j   4.53250027e+00 +5.57683850e-01j
  -3.45720439e+00 +1.79927666e-01j   1.09177492e+00 +4.40488405e+00j
   2.38909915e+00 -6.34316878e-02j  -3.24264852e+00 -1.35654506e+00j
   1.32605411e+00 -1.69522231e+00j   1.43371958e+00 +7.60824289e+00j
   3.55981058e+00 +3.94312536e-02j   3.83296143e+00 -2.06136428e+00j
   6.08925524e+00 +3.31872034e+00j   2.16282831e+00 +2.57327362e+00j
   1.46968974e+00 -2.22257500e+00j  -1.15640460e+00 +5.83164165e+00j
  -2.10587454e+00 -3.83072590e-01j   4.03032662e+00 -3.84854026e+00j
  -2.21753553e+00 +5.28645411e+00j  -1.93395853e+00 -2.67477553e+00j
   8.20640761e+00 +1.92260528e+00j  -2.91702355e+00 +1.42013608e+00j
   3.31337227e+00 -1.63675242e+00j   5.27516008e+00 +6.05882242e+00j
   2.01320360e+00 +2.89368356e+00j  -2.12298614e+00 -2.77560521e+00j
   2.54436704e+00 +7.20902375e-01j   1.20246485e+00 +5.32336100e+00j
   1.75627692e+00 -1.07031366e+00j  -4.72353863e+00 +1.14117049e+01j
   2.87428275e+00 +8.34306684e+00j   4.11409512e+00 -1.00653415e+01j
   1.11850831e+00 -8.53410213e+00j  -1.39159123e+01 +1.43571536e+01j
  -3.47434488e+00 +1.15495100e+00j   6.88968650e+00 +5.54125061e+00j
  -8.28232165e+00 +3.41597527e+00j   6.47789815e+00 +6.41138931e-01j
   1.35635927e+00 +1.05267187e+01j  -7.18572527e+00 +1.78642360e+00j
   4.22863868e+00 -2.54282804e+00j   4.05258902e+00 -3.63545376e+00j
  -9.49506247e-02 -5.01661348e+00j  -7.01788671e+00 +2.42696347e+00j
   8.03484300e+00 -3.11866961e+00j  -2.03112583e+00 -1.98583880e+00j
   5.72605598e+00 +4.12332080e+00j   7.39739132e-01 +6.77700362e+00j
   4.88079659e+00 -6.86631509e+00j   9.15739438e+00 +7.04819995e+00j
  -1.55834740e+01 +1.77724713e+01j   1.75074855e+00 -1.59934967e+00j
  -7.92520892e+00 -2.17072929e+00j  -7.78136555e+00 +3.38074232e+00j
   4.58953240e+00 -9.62189727e+00j   7.00000000e+00 -1.73205081e+00j
   3.45824528e+00 +5.52866418e+00j   1.14161888e+01 -1.04986492e+01j
   1.37191148e+01 +8.72713874e+00j   3.10816683e+00 +2.24110773e+00j
  -1.06623446e+01 +1.63540420e+00j   1.58402867e+01 -8.57128379e+00j
  -1.05778621e+01 -1.67602215e-01j  -1.88567454e+00 +6.93602795e+00j
  -3.17739534e+00 +3.39821890e+00j   3.51925782e+00 +1.28159072e+00j
  -4.16178982e+00 +1.44566186e+01j   1.42312326e+01 +1.63674785e+01j
   2.58262587e+00 +6.34719594e+00j  -1.10575554e+00 -1.86731689e+01j
   6.01608929e+00 +3.89726982e+00j   1.06096383e+01 -9.52831269e+00j
   4.74269902e-01 -1.26846691e+01j   2.96108556e+01 +7.67685832e+00j
  -1.02178955e+01 +1.69947638e+00j   7.03621177e+00 -8.06205842e+00j
  -1.72358168e+01 -5.38526940e-01j  -4.67405260e+00 -1.12074721e+01j
   1.44485656e+01 +1.29649973e+00j   5.30919127e+00 +1.54083677e+00j
   8.18391392e+00 +2.21768859e+00j   2.95900824e+01 -9.58200477e+00j
   1.51381460e+01 -6.14437588e+00j  -9.99557862e+00 -1.31297939e+00j
   3.64436819e+00 -4.57621055e+00j   1.00408032e+01 +2.25166517e+01j
  -6.90801402e+00 -2.69156315e-02j  -8.68690472e+00 -2.39791159e+00j
  -1.12301987e+01 -4.60445012e+00j   1.95832851e+01 +7.40204115e+00j
  -5.15938265e+00 +1.07628959e+01j  -1.37770171e+01 -2.79980245e+00j
   9.71976731e+00 -2.12108326e+01j   1.05725770e+01 +1.53778138e+01j
   3.82484832e+00 -3.98906993e+00j   1.16797677e+01 +1.43709136e+01j
  -1.99945503e+01 +1.47734580e+01j   6.76911835e+00 +1.16873563e+01j
  -5.22180256e+00 -4.64665328e+00j  -8.32629259e+00 -4.33536303e+00j
   5.40068229e+00 -4.65158663e+00j  -2.36848677e+00 -7.02451340e+00j
  -2.28073979e+01 +4.91122945e+00j  -4.90749971e+00 -2.27153488e+01j
   1.11230352e+01 -9.82292704e+00j   9.58881278e+00 +2.91740715e+00j
   1.87355255e+00 +1.25601794e+01j  -1.89911679e+00 +1.54687344e+01j
  -1.32629667e+01 +2.41069101e+01j  -8.82802661e+00 -4.50913674e+00j
   1.72188255e+01 +3.16595436e+00j   2.45669729e+01 -6.51241977e+00j
   3.06947216e+00 +3.58238043e+00j   1.84246756e+01 +9.51045105e+00j
   2.05336497e+00 +2.22462222e+01j  -1.13807361e+01 +2.56246854e-02j
   7.98112724e+00 -1.45410245e+01j   2.65096133e+00 -1.41053443e+01j
  -2.38466297e+01 +3.71144035e+00j   1.71877239e+01 +6.48894292e+00j
   1.14280923e+01 +6.25993964e+00j   5.35406126e+00 +5.56292524e-01j
  -5.65005336e+00 -6.83823025e+00j   2.02001966e+01 -8.74726944e+00j
   2.11255621e+00 -2.92619656e+00j  -1.04442554e+01 +1.41521687e+01j
  -1.13927606e+01 -8.09568323e+00j  -4.70529203e+00 +2.35831248e+00j
  -2.43225947e+00 +1.16547764e+00j  -1.11616530e+01 +1.39494224e+00j
  -1.75358916e+00 +4.02188722e+00j   1.75509542e+00 -1.42392243e+01j
  -4.47517978e+00 -3.41000775e+00j   1.30617021e+01 -8.98808191e+00j
   1.65383591e+01 +3.44009206e+00j   9.46090580e+00 +1.69520232e+00j
   1.77460823e+01 -8.69590249e+00j  -1.92412866e+00 +7.25745357e+00j
  -8.40475761e+00 -6.30369172e+00j  -5.77856437e+00 -9.99892674e+00j
   1.88230002e+00 +1.99180864e+00j  -3.83965422e+00 +4.80129080e+00j
  -2.70578241e+00 -3.23423396e+00j  -2.49312156e+00 +8.13317699e+00j
  -1.15782353e+01 -6.05846849e+00j  -4.51217144e-02 -9.19848119e+00j
   8.74472549e+00 +8.36545203e+00j   1.96545447e+00 +4.30386440e+00j
   6.66145855e+00 -1.04511172e+00j   3.41128133e+00 +2.54710718e-01j
  -5.07842353e+00 -4.16681430e-01j   3.64280896e+00 +2.06251300e+00j
   3.31508168e+00 +3.89868176e+00j   2.02409971e+00 -5.04422982e+00j
   1.05213097e+01 +1.62482018e+00j   7.98804984e+00 +9.55249462e+00j
  -1.41911982e-02 -1.94990046e+00j   5.96503239e+00 +1.95226789e+00j
  -6.86666546e+00 +4.61701445e+00j   3.70877718e+00 -7.55139204e+00j
   5.16152201e+00 -6.56098333e+00j   1.65500048e+00 -3.70024407e+00j
  -3.09612055e+00 +6.90346507e-01j  -1.29115096e+00 +4.21695504e+00j
   1.02953498e+00 +6.33696097e+00j   5.14358024e+00 -2.20939886e+00j
   5.57076762e-01 +7.09042090e+00j  -9.50971140e+00 +5.00104926e+00j
  -7.26529822e+00 +9.38795253e-01j   4.93178556e+00 +4.37809567e+00j
   3.89159337e+00 +1.85208334e+00j  -5.80549622e+00 +3.02431284e+00j
  -4.16736214e+00 +2.72148233e+00j   2.70909190e+01 +6.88325653e+00j
   2.48669633e+00 -5.42310243e+00j  -2.35997012e+00 -8.46824321e+00j
   7.77056819e+00 +2.19710790e+00j  -6.90612809e-01 +4.75969828e+00j
   1.34821410e+01 +1.34037400e+01j  -3.72049883e+00 +1.46111880e+01j
   2.95823076e+00 +1.66827880e+01j  -1.60197682e+01 +7.75543531e+00j
   8.83908340e+00 -7.93794970e+00j   2.34468710e+01 +2.23890132e+01j
  -1.66633043e+01 +1.24007621e+01j   1.51846145e+00 +4.00950361e+00j
  -8.71674337e+00 -2.62181012e+01j   3.04747682e+00 +2.23878702e+01j
   5.64384580e+00 -5.56209485e+00j   2.25622220e+01 -2.67918449e+01j
  -2.70204603e+00 +7.14252878e+00j   7.30799897e+00 -3.82894008e+01j
  -1.36174409e+01 +3.29169792e+01j   2.33882850e+01 +7.65809093e+00j
   6.06045220e+00 +1.03257381e+01j  -4.25020961e+01 +7.64243839e+00j
  -2.11854726e+01 +4.16095818e-01j  -1.70325538e+01 -5.83215957e+00j
   5.31891328e+00 +6.81638362e+00j  -1.87338519e+01 -1.11443311e+01j
  -3.01211155e+01 -4.28531220e+01j  -1.45146291e+01 -1.79899365e+00j
   5.00000000e+00 +6.06217783e+01j  -1.56376005e+00 +7.98641810e+00j
  -5.97901914e+00 -2.80337831e+00j   9.64005322e+00 +1.86933470e+01j
   1.11433706e+01 +3.95468439e+01j  -8.88571944e+00 -2.71301701e+01j
   1.98399083e+01 +1.60471220e+01j   5.53243224e+01 -3.57471504e+01j
  -5.94735783e+00 -6.52709776e+01j   4.03049668e+01 +5.95247408e+00j
  -4.02152793e+01 -3.64629093e+00j   5.23052283e+01 +2.80818697e+01j
  -4.93363582e+01 -2.18115549e+01j   3.99759774e+01 -2.12995174e+01j
  -1.90580894e+01 +8.89009390e+00j  -2.06563169e+00 +3.98566719e+01j
   2.73124999e+01 +1.07224937e+01j  -1.88705983e+01 +2.85173090e+01j
  -2.37006159e+01 +3.28589793e+00j  -3.43140179e+01 +5.20041252e+01j
   4.19627452e+00 +1.20255512e+01j   5.70516643e+01 -1.62426228e-01j
  -3.14199410e+01 -7.17524707e+01j   3.30218321e+01 -1.88906786e+01j
  -9.03536450e+01 -2.25238164e+01j  -3.06644119e+01 -1.22719864e+01j
  -4.09620118e+01 -5.87198511e+01j   9.26082697e+00 +2.27970667e+01j
  -2.35753128e+01 +3.88341481e+01j   7.63527639e+01 -1.13804338e+00j
  -6.86658610e+00 +6.29834214e+00j   9.14011320e+01 +2.44427376e+01j
  -3.35538129e+01 -2.03664612e+01j  -2.79810174e+01 +2.00659422e+01j
  -1.11104898e+01 +4.71114218e+01j   4.23373251e+01 -1.05309134e+01j
   8.18092013e+01 -5.43728459e+01j  -4.36691924e+01 +9.14485470e+01j
   6.65458529e+01 +7.56221029e+01j   5.37510915e+01 +5.40989050e+01j
   1.79870465e+01 +4.52732791e+01j   8.40310850e+01 +9.47878491e+01j
  -1.02521672e+01 +8.43960981e+01j   2.49810938e+01 +1.75592544e+01j
  -1.55874550e+01 -8.04612552e+01j  -1.39304497e+01 +1.62728224e+01j
   1.08014736e+02 +4.78536931e+01j  -4.02959490e+01 +5.13208860e+01j
  -4.44628781e+00 +9.23002448e+01j  -3.91279450e+01 -4.97097328e+01j
  -7.43935598e+00 +5.05059417e+01j   3.37095782e+01 +2.28058601e+01j
   5.04476886e+01 -1.60437494e+01j   5.59457086e+01 -9.07953135e+01j
   1.43552312e+00 -1.30956981e+02j  -3.96809999e-01 +9.39439975e+01j
   5.44370832e+01 -3.28142166e+01j   1.08128056e+01 -2.16538023e+01j
  -6.22646780e+01 +2.85639832e+00j   1.81679690e+01 -4.81613695e+01j
  -8.38419674e+01 -1.72831842e+02j   6.57714597e+00 -8.54323311e+01j
  -3.27547699e+01 +2.04689294e+01j  -1.15562810e+02 -1.09195082e+02j
  -6.25283590e+01 -1.01053423e+01j   1.50489260e+01 +3.35675508e+01j
  -7.80110508e+01 +1.56797225e+01j   7.31708512e+01 +1.20901628e+01j
  -1.02806361e+02 +3.18616087e+01j  -4.78205873e+01 +2.95089794e+01j
   1.55962689e+02 +4.88848887e+01j  -3.89866469e+01 +5.60732103e+01j
   2.05545046e+01 -1.47206959e+02j   1.27029608e+02 +8.41816871e+01j
  -9.12447263e+01 -6.37298121e+01j   6.45487854e+00 +7.53281323e+01j
  -7.83799815e+01 +9.07958410e+01j  -6.88721114e+01 -1.39753917e+02j
  -4.52888320e+01 +3.40248144e+01j   7.17908770e+01 -7.48747560e+01j
   7.12194347e+00 +2.03578364e+01j  -9.81220500e+00 -2.01079800e+01j
  -5.48559065e+01 +1.16055165e+01j   1.44605060e+02 -1.29529112e+02j
   3.81282287e+00 +4.08946156e+01j   1.05788964e+02 +5.82317336e+01j
   8.92572505e+01 -1.67975527e+02j   5.08355439e+01 +7.24835525e+01j
  -1.80685131e+02 -9.63871847e+00j   7.88167961e+01 +2.00726758e+02j
  -5.26785182e+00 +8.77034473e+01j  -1.09679618e+02 +9.51662573e+01j
  -8.38164611e+01 -5.74126848e+01j   1.86846985e+02 -5.09575861e+01j
  -3.55342633e+01 -2.21752592e+01j   1.97514201e+01 +2.87325918e+01j
  -1.23514557e+01 -3.71572743e+01j  -4.47763540e+00 +1.26733412e+01j
  -7.50121343e+01 +2.63038507e+02j   5.05789633e+01 -8.33433504e+01j
  -1.81485693e+02 -7.66240134e+01j   6.93424608e+01 -1.33145839e+02j
  -1.53120429e+02 +2.18023140e+01j  -3.24599229e+00 +3.17453142e+01j
  -2.18718006e+01 +1.04099138e+02j   9.24498465e+01 -7.33350403e+01j
  -3.93448437e-01 +1.72646942e+02j   4.27040984e+01 +7.57879238e+01j
  -6.91749598e+00 +4.98729141e+01j   1.21052004e+02 -1.89183287e+02j
   5.26902274e+01 +8.11666122e+00j  -6.34392467e+00 +2.87950127e+01j
   4.37137816e+01 +1.30714813e+01j  -4.87941805e+01 -5.31277649e+01j
   1.30957694e+02 -1.09916089e+01j  -1.19858371e+02 +1.06566552e+02j
  -9.40561833e+00 +4.28139646e+01j  -1.91033725e+01 -1.04784818e+02j
  -4.91024534e+00 -8.07620020e+01j   8.10247963e+01 -1.87873350e+02j
  -1.05617296e+02 +8.90544295e+01j  -1.48232853e+01 +1.18371367e+02j
   3.60337258e-01 +2.34075093e+01j  -1.44767900e+02 -1.21128325e+02j
  -1.27945030e+02 +1.13028881e+01j   7.07712884e+01 +1.48178206e+01j
   1.73773656e+02 -6.30174249e+01j   1.16085690e+01 -3.10659278e+01j
  -3.16915650e+01 +2.06441813e+01j  -5.14994404e+01 -1.69160201e+01j
  -8.18275400e+01 -5.74167067e+01j   1.79759447e+01 +5.88008657e+01j
  -1.73758549e+01 +9.20302505e+01j  -5.35259839e+01 -5.07331966e+01j
   1.11654603e+02 -1.03943564e+01j  -2.38635987e-01 +3.28947039e+01j
   2.96393489e+01 +1.54051605e+02j   1.14963490e+02 +1.04409710e+02j
   1.67001630e+01 -3.65012795e+01j   6.62182723e+01 -6.83127732e+00j
  -7.67543666e+01 +2.67171630e+02j  -1.27188065e+02 +8.54217810e+01j
  -5.47498096e+01 +5.63435382e+01j  -8.02617387e+01 -6.74371963e+01j
  -1.58027095e+02 +3.93454454e+01j   8.94328035e+00 +1.80853606e+02j
  -1.10984317e+02 +1.88776251e+01j  -1.28000000e+02 +4.45532500e-13j
  -1.10984317e+02 -1.88776251e+01j   8.94328035e+00 -1.80853606e+02j
  -1.58027095e+02 -3.93454454e+01j  -8.02617387e+01 +6.74371963e+01j
  -5.47498096e+01 -5.63435382e+01j  -1.27188065e+02 -8.54217810e+01j
  -7.67543666e+01 -2.67171630e+02j   6.62182723e+01 +6.83127732e+00j
   1.67001630e+01 +3.65012795e+01j   1.14963490e+02 -1.04409710e+02j
   2.96393489e+01 -1.54051605e+02j  -2.38635987e-01 -3.28947039e+01j
   1.11654603e+02 +1.03943564e+01j  -5.35259839e+01 +5.07331966e+01j
  -1.73758549e+01 -9.20302505e+01j   1.79759447e+01 -5.88008657e+01j
  -8.18275400e+01 +5.74167067e+01j  -5.14994404e+01 +1.69160201e+01j
  -3.16915650e+01 -2.06441813e+01j   1.16085690e+01 +3.10659278e+01j
   1.73773656e+02 +6.30174249e+01j   7.07712884e+01 -1.48178206e+01j
  -1.27945030e+02 -1.13028881e+01j  -1.44767900e+02 +1.21128325e+02j
   3.60337258e-01 -2.34075093e+01j  -1.48232853e+01 -1.18371367e+02j
  -1.05617296e+02 -8.90544295e+01j   8.10247963e+01 +1.87873350e+02j
  -4.91024534e+00 +8.07620020e+01j  -1.91033725e+01 +1.04784818e+02j
  -9.40561833e+00 -4.28139646e+01j  -1.19858371e+02 -1.06566552e+02j
   1.30957694e+02 +1.09916089e+01j  -4.87941805e+01 +5.31277649e+01j
   4.37137816e+01 -1.30714813e+01j  -6.34392467e+00 -2.87950127e+01j
   5.26902274e+01 -8.11666122e+00j   1.21052004e+02 +1.89183287e+02j
  -6.91749598e+00 -4.98729141e+01j   4.27040984e+01 -7.57879238e+01j
  -3.93448436e-01 -1.72646942e+02j   9.24498465e+01 +7.33350403e+01j
  -2.18718006e+01 -1.04099138e+02j  -3.24599229e+00 -3.17453142e+01j
  -1.53120429e+02 -2.18023140e+01j   6.93424608e+01 +1.33145839e+02j
  -1.81485693e+02 +7.66240134e+01j   5.05789633e+01 +8.33433504e+01j
  -7.50121343e+01 -2.63038507e+02j  -4.47763540e+00 -1.26733412e+01j
  -1.23514557e+01 +3.71572743e+01j   1.97514201e+01 -2.87325918e+01j
  -3.55342633e+01 +2.21752592e+01j   1.86846985e+02 +5.09575861e+01j
  -8.38164611e+01 +5.74126848e+01j  -1.09679618e+02 -9.51662573e+01j
  -5.26785182e+00 -8.77034473e+01j   7.88167961e+01 -2.00726758e+02j
  -1.80685131e+02 +9.63871847e+00j   5.08355439e+01 -7.24835525e+01j
   8.92572505e+01 +1.67975527e+02j   1.05788964e+02 -5.82317336e+01j
   3.81282287e+00 -4.08946156e+01j   1.44605060e+02 +1.29529112e+02j
  -5.48559065e+01 -1.16055165e+01j  -9.81220500e+00 +2.01079800e+01j
   7.12194347e+00 -2.03578364e+01j   7.17908770e+01 +7.48747560e+01j
  -4.52888320e+01 -3.40248144e+01j  -6.88721114e+01 +1.39753917e+02j
  -7.83799815e+01 -9.07958410e+01j   6.45487854e+00 -7.53281323e+01j
  -9.12447263e+01 +6.37298121e+01j   1.27029608e+02 -8.41816871e+01j
   2.05545046e+01 +1.47206959e+02j  -3.89866469e+01 -5.60732103e+01j
   1.55962689e+02 -4.88848887e+01j  -4.78205873e+01 -2.95089794e+01j
  -1.02806361e+02 -3.18616087e+01j   7.31708512e+01 -1.20901628e+01j
  -7.80110508e+01 -1.56797225e+01j   1.50489260e+01 -3.35675508e+01j
  -6.25283590e+01 +1.01053423e+01j  -1.15562810e+02 +1.09195082e+02j
  -3.27547699e+01 -2.04689294e+01j   6.57714597e+00 +8.54323311e+01j
  -8.38419674e+01 +1.72831842e+02j   1.81679690e+01 +4.81613695e+01j
  -6.22646780e+01 -2.85639832e+00j   1.08128056e+01 +2.16538023e+01j
   5.44370832e+01 +3.28142166e+01j  -3.96809999e-01 -9.39439975e+01j
   1.43552312e+00 +1.30956981e+02j   5.59457086e+01 +9.07953135e+01j
   5.04476886e+01 +1.60437494e+01j   3.37095782e+01 -2.28058601e+01j
  -7.43935598e+00 -5.05059417e+01j  -3.91279450e+01 +4.97097328e+01j
  -4.44628781e+00 -9.23002448e+01j  -4.02959490e+01 -5.13208860e+01j
   1.08014736e+02 -4.78536931e+01j  -1.39304497e+01 -1.62728224e+01j
  -1.55874550e+01 +8.04612552e+01j   2.49810938e+01 -1.75592544e+01j
  -1.02521672e+01 -8.43960981e+01j   8.40310850e+01 -9.47878491e+01j
   1.79870465e+01 -4.52732791e+01j   5.37510915e+01 -5.40989050e+01j
   6.65458529e+01 -7.56221029e+01j  -4.36691924e+01 -9.14485470e+01j
   8.18092013e+01 +5.43728459e+01j   4.23373251e+01 +1.05309134e+01j
  -1.11104898e+01 -4.71114218e+01j  -2.79810174e+01 -2.00659422e+01j
  -3.35538129e+01 +2.03664612e+01j   9.14011320e+01 -2.44427376e+01j
  -6.86658610e+00 -6.29834214e+00j   7.63527639e+01 +1.13804338e+00j
  -2.35753128e+01 -3.88341481e+01j   9.26082697e+00 -2.27970667e+01j
  -4.09620118e+01 +5.87198511e+01j  -3.06644119e+01 +1.22719864e+01j
  -9.03536450e+01 +2.25238164e+01j   3.30218321e+01 +1.88906786e+01j
  -3.14199410e+01 +7.17524707e+01j   5.70516643e+01 +1.62426228e-01j
   4.19627452e+00 -1.20255512e+01j  -3.43140179e+01 -5.20041252e+01j
  -2.37006159e+01 -3.28589793e+00j  -1.88705983e+01 -2.85173090e+01j
   2.73124999e+01 -1.07224937e+01j  -2.06563169e+00 -3.98566719e+01j
  -1.90580894e+01 -8.89009390e+00j   3.99759774e+01 +2.12995174e+01j
  -4.93363582e+01 +2.18115549e+01j   5.23052283e+01 -2.80818697e+01j
  -4.02152793e+01 +3.64629093e+00j   4.03049668e+01 -5.95247408e+00j
  -5.94735783e+00 +6.52709776e+01j   5.53243224e+01 +3.57471504e+01j
   1.98399083e+01 -1.60471220e+01j  -8.88571944e+00 +2.71301701e+01j
   1.11433706e+01 -3.95468439e+01j   9.64005322e+00 -1.86933470e+01j
  -5.97901914e+00 +2.80337831e+00j  -1.56376005e+00 -7.98641810e+00j
   5.00000000e+00 -6.06217783e+01j  -1.45146291e+01 +1.79899365e+00j
  -3.01211155e+01 +4.28531220e+01j  -1.87338519e+01 +1.11443311e+01j
   5.31891328e+00 -6.81638362e+00j  -1.70325538e+01 +5.83215957e+00j
  -2.11854726e+01 -4.16095818e-01j  -4.25020961e+01 -7.64243839e+00j
   6.06045220e+00 -1.03257381e+01j   2.33882850e+01 -7.65809093e+00j
  -1.36174409e+01 -3.29169792e+01j   7.30799897e+00 +3.82894008e+01j
  -2.70204603e+00 -7.14252878e+00j   2.25622220e+01 +2.67918449e+01j
   5.64384580e+00 +5.56209485e+00j   3.04747682e+00 -2.23878702e+01j
  -8.71674337e+00 +2.62181012e+01j   1.51846145e+00 -4.00950361e+00j
  -1.66633043e+01 -1.24007621e+01j   2.34468710e+01 -2.23890132e+01j
   8.83908340e+00 +7.93794970e+00j  -1.60197682e+01 -7.75543531e+00j
   2.95823076e+00 -1.66827880e+01j  -3.72049883e+00 -1.46111880e+01j
   1.34821410e+01 -1.34037400e+01j  -6.90612809e-01 -4.75969828e+00j
   7.77056819e+00 -2.19710790e+00j  -2.35997012e+00 +8.46824321e+00j
   2.48669633e+00 +5.42310243e+00j   2.70909190e+01 -6.88325653e+00j
  -4.16736214e+00 -2.72148233e+00j  -5.80549622e+00 -3.02431284e+00j
   3.89159337e+00 -1.85208334e+00j   4.93178556e+00 -4.37809567e+00j
  -7.26529822e+00 -9.38795265e-01j  -9.50971140e+00 -5.00104926e+00j
   5.57076762e-01 -7.09042090e+00j   5.14358024e+00 +2.20939886e+00j
   1.02953498e+00 -6.33696097e+00j  -1.29115096e+00 -4.21695504e+00j
  -3.09612055e+00 -6.90346508e-01j   1.65500048e+00 +3.70024407e+00j
   5.16152201e+00 +6.56098333e+00j   3.70877718e+00 +7.55139204e+00j
  -6.86666546e+00 -4.61701445e+00j   5.96503239e+00 -1.95226789e+00j
  -1.41911984e-02 +1.94990046e+00j   7.98804984e+00 -9.55249462e+00j
   1.05213097e+01 -1.62482018e+00j   2.02409971e+00 +5.04422982e+00j
   3.31508169e+00 -3.89868176e+00j   3.64280896e+00 -2.06251300e+00j
  -5.07842354e+00 +4.16681429e-01j   3.41128133e+00 -2.54710718e-01j
   6.66145855e+00 +1.04511172e+00j   1.96545447e+00 -4.30386440e+00j
   8.74472549e+00 -8.36545203e+00j  -4.51217144e-02 +9.19848119e+00j
  -1.15782353e+01 +6.05846849e+00j  -2.49312156e+00 -8.13317699e+00j
  -2.70578241e+00 +3.23423396e+00j  -3.83965422e+00 -4.80129080e+00j
   1.88230002e+00 -1.99180864e+00j  -5.77856437e+00 +9.99892674e+00j
  -8.40475761e+00 +6.30369172e+00j  -1.92412866e+00 -7.25745357e+00j
   1.77460823e+01 +8.69590249e+00j   9.46090580e+00 -1.69520232e+00j
   1.65383591e+01 -3.44009206e+00j   1.30617021e+01 +8.98808191e+00j
  -4.47517978e+00 +3.41000775e+00j   1.75509542e+00 +1.42392243e+01j
  -1.75358916e+00 -4.02188722e+00j  -1.11616530e+01 -1.39494224e+00j
  -2.43225947e+00 -1.16547764e+00j  -4.70529203e+00 -2.35831248e+00j
  -1.13927606e+01 +8.09568323e+00j  -1.04442554e+01 -1.41521687e+01j
   2.11255621e+00 +2.92619656e+00j   2.02001966e+01 +8.74726944e+00j
  -5.65005336e+00 +6.83823025e+00j   5.35406126e+00 -5.56292524e-01j
   1.14280923e+01 -6.25993964e+00j   1.71877239e+01 -6.48894292e+00j
  -2.38466297e+01 -3.71144035e+00j   2.65096133e+00 +1.41053443e+01j
   7.98112724e+00 +1.45410245e+01j  -1.13807361e+01 -2.56246854e-02j
   2.05336497e+00 -2.22462222e+01j   1.84246756e+01 -9.51045105e+00j
   3.06947216e+00 -3.58238043e+00j   2.45669729e+01 +6.51241977e+00j
   1.72188255e+01 -3.16595436e+00j  -8.82802661e+00 +4.50913674e+00j
  -1.32629667e+01 -2.41069101e+01j  -1.89911679e+00 -1.54687344e+01j
   1.87355255e+00 -1.25601794e+01j   9.58881278e+00 -2.91740715e+00j
   1.11230352e+01 +9.82292704e+00j  -4.90749971e+00 +2.27153488e+01j
  -2.28073979e+01 -4.91122945e+00j  -2.36848677e+00 +7.02451340e+00j
   5.40068229e+00 +4.65158663e+00j  -8.32629259e+00 +4.33536303e+00j
  -5.22180256e+00 +4.64665328e+00j   6.76911835e+00 -1.16873563e+01j
  -1.99945503e+01 -1.47734580e+01j   1.16797677e+01 -1.43709136e+01j
   3.82484832e+00 +3.98906993e+00j   1.05725770e+01 -1.53778138e+01j
   9.71976731e+00 +2.12108326e+01j  -1.37770171e+01 +2.79980245e+00j
  -5.15938265e+00 -1.07628959e+01j   1.95832851e+01 -7.40204115e+00j
  -1.12301987e+01 +4.60445012e+00j  -8.68690472e+00 +2.39791159e+00j
  -6.90801402e+00 +2.69156320e-02j   1.00408032e+01 -2.25166517e+01j
   3.64436819e+00 +4.57621055e+00j  -9.99557862e+00 +1.31297939e+00j
   1.51381460e+01 +6.14437588e+00j   2.95900824e+01 +9.58200477e+00j
   8.18391392e+00 -2.21768859e+00j   5.30919127e+00 -1.54083677e+00j
   1.44485656e+01 -1.29649973e+00j  -4.67405260e+00 +1.12074721e+01j
  -1.72358168e+01 +5.38526940e-01j   7.03621177e+00 +8.06205842e+00j
  -1.02178955e+01 -1.69947638e+00j   2.96108556e+01 -7.67685832e+00j
   4.74269901e-01 +1.26846691e+01j   1.06096383e+01 +9.52831269e+00j
   6.01608929e+00 -3.89726982e+00j  -1.10575554e+00 +1.86731689e+01j
   2.58262587e+00 -6.34719594e+00j   1.42312326e+01 -1.63674785e+01j
  -4.16178982e+00 -1.44566186e+01j   3.51925782e+00 -1.28159072e+00j
  -3.17739534e+00 -3.39821890e+00j  -1.88567454e+00 -6.93602795e+00j
  -1.05778621e+01 +1.67602216e-01j   1.58402867e+01 +8.57128379e+00j
  -1.06623446e+01 -1.63540421e+00j   3.10816683e+00 -2.24110773e+00j
   1.37191148e+01 -8.72713874e+00j   1.14161888e+01 +1.04986492e+01j
   3.45824528e+00 -5.52866418e+00j   7.00000000e+00 +1.73205081e+00j
   4.58953240e+00 +9.62189727e+00j  -7.78136555e+00 -3.38074232e+00j
  -7.92520892e+00 +2.17072929e+00j   1.75074855e+00 +1.59934967e+00j
  -1.55834740e+01 -1.77724713e+01j   9.15739438e+00 -7.04819995e+00j
   4.88079659e+00 +6.86631509e+00j   7.39739132e-01 -6.77700362e+00j
   5.72605598e+00 -4.12332080e+00j  -2.03112583e+00 +1.98583880e+00j
   8.03484301e+00 +3.11866961e+00j  -7.01788671e+00 -2.42696347e+00j
  -9.49506300e-02 +5.01661346e+00j   4.05258902e+00 +3.63545376e+00j
   4.22863868e+00 +2.54282804e+00j  -7.18572527e+00 -1.78642360e+00j
   1.35635927e+00 -1.05267187e+01j   6.47789815e+00 -6.41138931e-01j
  -8.28232165e+00 -3.41597527e+00j   6.88968650e+00 -5.54125061e+00j
  -3.47434488e+00 -1.15495100e+00j  -1.39159123e+01 -1.43571536e+01j
   1.11850831e+00 +8.53410213e+00j   4.11409512e+00 +1.00653415e+01j
   2.87428275e+00 -8.34306684e+00j  -4.72353863e+00 -1.14117049e+01j
   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
  -2.21753553e+00 -5.28645411e+00j   4.03032662e+00 +3.84854026e+00j
  -2.10587454e+00 +3.83072590e-01j  -1.15640460e+00 -5.83164165e+00j
   1.46968974e+00 +2.22257500e+00j   2.16282831e+00 -2.57327362e+00j
   6.08925524e+00 -3.31872034e+00j   3.83296143e+00 +2.06136428e+00j
   3.55981058e+00 -3.94312536e-02j   1.43371958e+00 -7.60824289e+00j
   1.32605411e+00 +1.69522232e+00j  -3.24264852e+00 +1.35654506e+00j
   2.38909915e+00 +6.34316874e-02j   1.09177492e+00 -4.40488405e+00j
  -3.45720439e+00 -1.79927666e-01j   4.53250027e+00 -5.57683850e-01j
   4.71331015e+00 +3.07752021e+00j  -1.73033058e+00 -9.79141462e-01j
   2.95444423e+00 -6.83800061e-01j   3.50258757e+00 +2.63485069e+00j
   1.09678522e+00 -4.20393097e+00j   1.08122204e+00 -2.86208680e+00j
   7.70104609e-01 +4.73078613e+00j   1.53920009e+00 -3.09403729e+00j
   2.83821733e+00 -2.29489584e+00j  -1.34453759e+00 +3.92747759e+00j
   1.29517635e+00 -1.50719848e+00j   5.80013657e+00 -1.82333361e+00j
  -1.40765494e+00 +1.72098610e+00j   5.55682885e-01 -7.41771159e-01j
   6.81097362e+00 -2.71976521e-01j  -7.69606174e-01 -9.55496358e-02j
  -1.56693898e+00 -2.30866899e+00j   5.71978168e+00 +2.24134791e+00j
   5.34030066e-01 -4.41858752e-01j   3.12891841e-01 -4.92329497e+00j
   3.81200013e+00 +2.24298709e+00j   1.07633640e+00 +1.42361549e+00j
   1.84061227e+00 -5.37144514e+00j   2.51875413e+00 +1.40487502e+00j
  -1.24604984e+00 +2.74004476e+00j   5.08680688e+00 -3.35356756e+00j
   2.63983216e+00 +6.62947756e-01j  -2.87637028e+00 +5.76121673e-01j
   4.42786162e+00 -1.54486081e+00j   2.30138078e+00 -1.34176711e-02j
  -2.29741360e+00 -1.33221948e+00j   3.67921738e+00 -2.26480045e+00j
   3.54226349e+00 -5.36119991e-01j  -1.86724455e+00 -7.78461504e-01j
   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]

Merci pour vos lumières. J'ai du oublié mes cours

[wiztricks]

Salut,

Pas facile de comprendre ce que vous voulez faire!
Pourquoi ne pas faire votre marché sur Google avant de coder?
Un exemple comme celui-ci n'est peut être pas ce que vous voulez mais il a l'avantage de vous montrer ce que çà sort.
Bon courage

- W

[Toug19]

Je l'ai fait, mais j'avais du mal à trouver tous les modules des exemples que je trouvais qui cherchaient à tracer des courbes.
En gros je cherchais quelque chose de plus simple. Me plonger dans pylab ne m'est pas indispensable.

Je veux obtenir les principales harmoniques d'un signal que j'enregistre.
Je les ai obtiens je penses dans un tableau par scipy.fft mais je ne sais pas comment interpréter ce tableau.

[tyrtamos]

Bonjour,

Mes souvenir de fft sont trop lointains pour que je sois d'une aide efficace, mais par curiosité, j'ai essayé le petit code très simple et ça marche bien.

Il faut pourtant corriger un peu le code: voilà ma correction (Python 3.4, numpy, scipy, matplotlib):

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
#!/usr/bin/python
# -*- coding: utf-8 -*-
# Python 3
 
import matplotlib.pyplot as plt
from scipy.io import wavfile
from scipy.fftpack import fft
 
fs, data = wavfile.read('ringin.wav')  # chargement du fichier wav
 
a = data.T[0]  # 1er canal. type de data et a: class 'numpy.ndarray'
 
b = [(elem / (2 ** 8)) * 2 - 1 for elem in a]  # changement d'échelle des valeurs
 
c = fft(b)  # liste de complexes. type de c: class 'numpy.complex128'
 
d = len(c) // 2  # on n'a besoin que de la moitié de la liste fft
 
plt.plot(abs(c[0:(d - 1)]), 'r')  # affichage
plt.show()

La fenêtre de matplotlib s'affiche bien avec le spectre. Pour le fichier wav que j'ai pris en exemple (un son de Windows), ça donne ça:

[Toug19]

Merci pour vos aides, je suis en train de reprendre le code trouvé ici https://sites.google.com/site/haskel...on-numpy-scipy

y'a quelques trucs un peu bête mais c'est une base.

Je ne dois pas comprendre le fonctionnement de la fft car j'ai du mal à comprendre à quoi rime le calcul:

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
 
frq = k/T # two sides frequency range
frq = frq[range(n/2)] # one side frequency range

voici ce j'en comprend pour la première ligne:
frq = Numéro d'échantillon / Valeur temporelle du dernier échantillon

Je ne vois pas physiquement ce que ça représente.

[Toug19]

Je répond à mon interrogation:

Il s'agit donc de calculer les fréquences du résultat de la fft. scipy.fft créer un tableau contenant les puissances (en calculant les modules des éléments). L'emplacement dans le tableau indique la fréquence.