Generating audio noise

Question

I would like to generate audio background noise with python and saving it in an mp3. Ideally, I can also adjust the amplitude and the frequency. Is there a package that I can use for that?

THX Lazloo

Answer 1

With scipy, you can save numpy array as a .wav file. You just need to generate a sequence of random samples from normal distribution with zero mean. truncnorm is truncated normal distribution, which makes sure the sample values are not too big or too small (+- 2^16 in case of 16 bit .wav files)

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

sample_rate = 44100
length_in_seconds = 3
amplitude = 11
noise = stats.truncnorm(-1, 1, scale=min(2**16, 2**amplitude)).rvs(sample_rate * length_in_seconds)
wavfile.write('noise.wav', sample_rate, noise.astype(np.int16))