[Python] How to FFT mp3 data

0. Overview

How to FFT mp3 data using Python. Since pydub and ffmpeg are used as libraries, please download them in advance.

1. Download library

sudo apt install ffmpeg
pip install pydub

2. Code


#! /usr/bin/env python
# -*- coding: utf-8 -*-
from pydub import AudioSegment as AS
import ffmpeg
import numpy as np
import matplotlib.pyplot as plt

file = "Enter the file name"

sound = AS.from_file(file + ".mp3", "mp3")
data = np.array(sound.get_array_of_samples())
spec = np.fft.fft(data)   #A two-dimensional array(Real part, imaginary part)
freq = np.fft.fftfreq(data.shape[0], 1.0/sound.frame_rate) 
spec = spec[:int(spec.shape[0]/2 + 1)]    #Removal of spectral elements with negative frequencies
freq = freq[:int(freq.shape[0]/2 + 1)]    #Removal of frequency elements that have a negative frequency
max_spec=max(np.abs(spec))    #Get maximum sound pressure(Used to normalize sound pressure)
plt.plot(freq, np.abs(spec)/max_spec)

plt.xlim([0,4000])    #Frequency range to output to the graph[Hz]
plt.ylabel("Sound Pressure[-]")
plt.savefig(file + ".png ")  #Output as png file

3. Supplement

You can change to the log scale by uncommenting plt.yscale ("log").

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