#
# sound.py
# (c) Neil Gershenfeld  2/3/11
# sound file example
#

from numpy import *
import scipy.io.wavfile

rate = 22050
period = 1.0/rate
duration = 1.1
freq = 400.0
amp = 2**15-1
time = arange(duration*rate)*period - duration/2.0
wave = amp * sin(2*pi*time*freq) / (2*pi*time*freq)
scipy.io.wavfile.write("sound.wav",rate,wave.astype(int16))
print "wrote %d samples to sound.wav"%len(wave)