How to generate audio from a numpy array?

Question

I want to create \"heart rate monitor\" effect from a 2D array in numpy and want the tone to reflect the values in the array.

Answer 1

Not sure of the particulars of how you would produce the audio from the array, but I have found mpg321 to be a great command-line audio player, and could potentially work for you.

I use it as my player of choice for Anki, which is written in python and has libraries that could be a great starting place for interfacing your code/arrays with audio.

Check out:

• anki.sound.py
• customPlayer.py

Answer 2

Another modern and convenient solution is to use pysoundfile, which can read and write a wide range of audio file formats:

import numpy as np
import soundfile as sf

data = np.random.uniform(-1, 1, 44100)
sf.write('new_file.wav', data, 44100)