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 www.ffmpeg.org.

The code given here works with Python 3. You will find the Python 2 version in the book's GitHub repository.

How to do it…

1. Let's import the packages:

   In [1]: import urllib
           from io import BytesIO
           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 to generate a sound from an English sentence. This function uses Google's Text-To-Speech (TTS) API. We retrieve the sound in the...