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| 1 | #! /usr/bin/env python | ||
| 2 | |||
| 3 | import sys | ||
| 4 | from math import sin, pi | ||
| 5 | from aubio import sink | ||
| 6 | from numpy import array | ||
| 7 | |||
| 8 | if len(sys.argv) != 2: | ||
| 9 | print 'usage: %s <outputfile>' % sys.argv[0] | ||
| 10 | sys.exit(1) | ||
| 11 | |||
| 12 | samplerate = 44100 # in Hz | ||
| 13 | pitch = 2200 # in Hz | ||
| 14 | blocksize = 256 # in samples | ||
| 15 | duration = 0.02 # in seconds | ||
| 16 | |||
| 17 | twopi = pi * 2. | ||
| 18 | |||
| 19 | duration = int ( 44100 * duration ) # convert to samples | ||
| 20 | attack = 3 | ||
| 21 | |||
| 22 | period = int ( float(samplerate) / pitch ) | ||
| 23 | sinetone = [ 0.7 * sin(twopi * i/ period) for i in range(period) ] | ||
| 24 | sinetone *= int ( duration / period ) | ||
| 25 | sinetone = array(sinetone, dtype = 'float32') | ||
| 26 | |||
| 27 | from math import exp, e | ||
| 28 | for i in range(len(sinetone)): | ||
| 29 | sinetone[i] *= exp( - e * float(i) / len(sinetone)) | ||
| 30 | for i in range(attack): | ||
| 31 | sinetone[i] *= exp( e * (float(i) / attack - 1 ) ) | ||
| 32 | |||
| 33 | my_sink = sink(sys.argv[1], 44100) | ||
| 34 | |||
| 35 | i = 0 | ||
| 36 | while i + blocksize < duration: | ||
| 37 | my_sink(sinetone[i:i+blocksize], blocksize) | ||
| 38 | i += blocksize | ||