Python Spectrogram for 1-second Sound

Post date: Oct 24, 2019 3:34:17 AM

First install pydub. Use the virtual environment and Anaconda for best results.

$ ls anaconda3/envs

$ source activate sci

$ conda install -c conda-forge pydub

Launch spyder and enter the following code:

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

"""

#import the pyplot and wavfile modules

import matplotlib.pyplot as plot

from scipy.io import wavfile

from os import path

from pydub import AudioSegment

# Read the wav file (mono)

src = '/home/munim/Downloads/tailorbird1.mp3'

dst = 'tmp.wav'

sound = AudioSegment.from_mp3(src)

sound = sound.set_channels(1)

#onesecond = sound[-1000:] # last one second

onesecond = sound[:1000] # first one second

onesecond.export(dst, format='wav')

samplingFrequency, signalData = wavfile.read(dst)

print(samplingFrequency)

# Plot the signal read from wav file

plot.subplot(211)

plot.title('Spectrogram of file {}'.format(src))

plot.plot(signalData)

plot.xlabel('Sample')

plot.ylabel('Amplitude')

plot.subplot(212)

plot.specgram(signalData,Fs=samplingFrequency)

plot.xlabel('Time')

plot.ylabel('Frequency')

plot.show()

Here's the output:

References:

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