Python: Live Audio from NumPy Array
In this video, I show how to play sound from a NumPy array directly to the audio output.
The code for the tutorial is:
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| # Use the sounddevice module | |
| # http://python-sounddevice.readthedocs.io/en/0.3.10/ | |
| import numpy as np | |
| import sounddevice as sd | |
| import time | |
| # Samples per second | |
| sps = 44100 | |
| # Frequency / pitch | |
| freq_hz = 440.0 | |
| # Duration | |
| duration_s = 5.0 | |
| # Attenuation so the sound is reasonable | |
| atten = 0.3 | |
| # NumpPy magic to calculate the waveform | |
| each_sample_number = np.arange(duration_s * sps) | |
| waveform = np.sin(2 * np.pi * each_sample_number * freq_hz / sps) | |
| waveform_quiet = waveform * atten | |
| # Play the waveform out the speakers | |
| sd.play(waveform_quiet, sps) | |
| time.sleep(duration_s) | |
| sd.stop() |
