AttributeError: 'module' object has no attribute 'spectrogram'

Question

Currently, I'm writing a python script, which should do the following:

read an audio file respectively a wav file via scipy.io.wavfile.read().
calculate the spectrogram of given wav file.
write the data from spectrogram back into a wav file.

When I try to run the script, I get the following error:

Traceback (most recent call last):
  File "demo2.py", line 61, in <module>
    F,T,S = scipy.signal.spectrogram(s_mono,rate,window,None,nOverlap,nFFT)
AttributeError: 'module' object has no attribute 'spectrogram'

Which is rather strange, because in my opinion my code should work fine. I've already checked for Syntax Errors and I also looked up in the official scipy documentation but I couldn't find any clue what could possible be wrong with it.

Here's a little snippet of my code:

import scipy
from scipy import signal
import scipy.io.wavfile as wav
#---------------------------------

# here's the rest of my code    

F,T,S = scipy.signal.spectrogram(s_mono,rate,window,None,nOverlap,nFFT)

Additional Information: I'm working on a MacBook with MacOS 10.9.5

Basically yes. I reinstalled everything I had. And it seemed that I had two versions of scipy on my computer, which caused also trouble. Now everything just works fine. — Nico, Apr 12 '17 at 15:22

apoorlydrawnape · Accepted Answer · 2017-04-10T21:38:54.713

1

Since there's no signal.py, uninstall scipy and reinstall it without using pip. Get it from their website. Getting it with pip seems to almost always have problems.

edited Apr 10 '17 at 21:38

answered Apr 09 '17 at 14:56

apoorlydrawnape

288
3
12

The funny part is, that I tried it with F,T,S = signal.spectrogram(s_mono,rate,window,None,nOverlap,nFFT) but I get the same error. – Nico Apr 09 '17 at 18:34
which python version are you using? how it's named your own python script file? – BangTheBank Apr 09 '17 at 18:47
1

Ok. Now try removing the "from scipy import signal" but keeping "F,T,S = scipy.signal.spectrogram(s_mono,rate,window,None,nOverlap,nFFT)" as it originally was. – apoorlydrawnape Apr 09 '17 at 19:14
@BangTheBank: I'm using Python 2.7.5. – Nico Apr 09 '17 at 20:58
@apoorlydrawnape: I also tried this one before, but it didn't work :/ – Nico Apr 09 '17 at 21:00
@Nico how your script is named? if your script file is named signal.py you could have weird errors. – BangTheBank Apr 09 '17 at 21:02
@BangTheBank: My script name is "demo2.py" – Nico Apr 09 '17 at 21:07
Go to where the scipy is stored and make sure there is a signal file and look for spectrogram – apoorlydrawnape Apr 09 '17 at 21:17
@BangTheBank: So I checked out, if there is a signal.py file in my scipy directory and there is non, only spectral.py, which contains spectrogram. – Nico Apr 09 '17 at 21:40
Alright. Try `from scipy import spectral` and `F,T,S = spectral.spectrogram(s_mono,rate,window,None,nOverlap,nFFT)` . Did you get your scipy from a different place? – apoorlydrawnape Apr 10 '17 at 01:31
@apoorlydrawnape I got my scipy from the official website and installed it via pip. And I tried your method and now I get an Import Error – Nico Apr 10 '17 at 06:04
I'm going to change my answer and I feel like it's the only reasonable thing. – apoorlydrawnape Apr 10 '17 at 21:38

sobek · Answer 2 · 2017-04-09T21:04:19.977

1

Please see if this works for you:

from scipy import signal
import numpy as np
import math
import matplotlib.pyplot as plt

t = np.arange(10000)
sig = np.sin(2. * math.pi * 1 / 1000. * t)
f, t, Sxx = signal.spectrogram(sig, 1.)
plt.pcolormesh(t, f, Sxx)
plt.ylabel('Frequency [Hz]')
plt.xlabel('Time [sec]')
plt.show()

It works for me with python 2.7 and scipy 0.19.

If this works for you, then you are probably causing some weird namespace errors in your script (calling a variable signal, etc.).

edited Apr 09 '17 at 21:04

answered Apr 09 '17 at 20:58

sobek

1,386
10
28

The moment I try to call signal.spectrogram, I get an attribute error. – Nico Apr 09 '17 at 21:10
Have you tried the following: `from scipy.signal import spectral as spcl; sss = spcl.spectrogram(x, fs) ` It works for periodogram, welch and lombscargle but not for csd, coherence & spectrogram. Spectrogram function resides in spectral.py. Any expert advise? – Bussller May 12 '17 at 04:55
Thanks - that test worked correctly. Python 3.9 Mac BigSur. – Tim Seed Feb 06 '21 at 03:39

score 0 · Answer 3 · answered Feb 06 '21 at 06:05

I also had an issue with this ... caused by my bad variable assignments.

This is how I read and process a wav file. Please note the wave file needs to have metadata stripped (I used ffmpeg to do this)

from scipy import signal
import numpy as np
import math
import matplotlib.pyplot as plt

import soundfile as sf
from matplotlib import pyplot as plt
datasignal, fs_rate= sf.read('40m_stripped.wav')
print(f"Data shape is {datasignal.shape}")
sig=datasignal[::,0]
print(f"Sig shape is {sig.shape}")
f, t, Sxx = signal.spectrogram(sig, fs_rate)
plt.pcolormesh(t, f, Sxx)
plt.ylabel('Frequency [Hz]')
plt.xlabel('Time [sec]')
plt.show()

AttributeError: 'module' object has no attribute 'spectrogram'

3 Answers3

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