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

You can use the write function from scipy.io.wavfile to create a wav file which you can then play however you wish. Note that the array must be integers, so if you have floats, you might want to scale them appropriately:

import numpy as np
from scipy.io.wavfile import write

data = np.random.uniform(-1,1,44100) # 44100 random samples between -1 and 1
scaled = np.int16(data/np.max(np.abs(data)) * 32767)
write('test.wav', 44100, scaled)

If you want Python to actually play audio, then this page provides an overview of some of the packages/modules.