sound_synthesis.py

"""

Sound Synthesis with scipy
example from I don't remember where
"""
from scipy.io.wavfile import write
from numpy import linspace, sin, pi, int16
from pylab import plot, show, axis


# tone synthesis
def note(freq, len, amp=1, rate=44100):
    t = linspace(0, len, len * rate)
    data = sin(2 * pi * freq * t) * amp
    return data.astype(int16)  # two byte integers


# A tone, 2 seconds, 44100 samples per second
tone = note(440, 2, amp=10000)

write('440hzAtone.wav', 44100, tone)  # writing the sound to a file

plot(linspace(0, 2, 2 * 44100), tone)
axis([0, 0.4, 15000, -15000])
show()