Applying digital filters to speech sounds

In this recipe, we will show how to play sounds in the Notebook. We will also illustrate the effect of simple digital filters on speech sounds.

Getting ready

You need the pydub package. You can install it with pip install pydub or download it from https://github.com/jiaaro/pydub/.

This package requires the open source multimedia library FFmpeg for the decompression of MP3 files, available at http://www.ffmpeg.org.

How to do it

1. Let's import the packages:

   >>> from io import BytesIO
       import tempfile
       import requests
       import numpy as np
       import scipy.signal as sg
       import pydub
       import matplotlib.pyplot as plt
       from IPython.display import Audio, display
       %matplotlib inline

2. We create a Python function that loads an MP3 sound and returns a NumPy array with the raw sound data:

   >>> def speak(data):
           # We convert the mp3 bytes to wav.
           audio = pydub.AudioSegment.from_mp3(BytesIO(data))
           with tempfile.TemporaryFile...