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- import numpy
- from numpy.fft import fft, ifft
- from numpy.random import random_sample
- from alsaaudio import PCM, PCM_NONBLOCK, PCM_FORMAT_FLOAT_LE
- pcm = PCM()#mode=PCM_NONBLOCK)
- pcm.setrate(44100)
- pcm.setformat(PCM_FORMAT_FLOAT_LE)
- pcm.setchannels(1)
- pcm.setperiodsize(4096)
- def sine_wave(x, freq=100):
- sample = numpy.arange(x*4096, (x+1)*4096, dtype=numpy.float32)
- sample *= numpy.pi * 2 / 44100
- sample *= freq
- return numpy.sin(sample)
- for x in xrange(1000):
- sample = sine_wave(x, 100)
- pcm.write(sample.tostring())
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