feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change
on this file since ae81726 was
87b0c03,
checked in by Paul Brossier <piem@piem.org>, 12 years ago
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demos/demo_sink_create_woodblock.py: generate a woodblock like sound
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Property mode set to
100755
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File size:
951 bytes
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1 | #! /usr/bin/env python |
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2 | |
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3 | import sys |
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4 | from math import sin, pi |
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5 | from aubio import sink |
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6 | from numpy import array |
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7 | |
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8 | if len(sys.argv) != 2: |
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9 | print 'usage: %s <outputfile>' % sys.argv[0] |
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10 | sys.exit(1) |
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11 | |
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12 | samplerate = 44100 # in Hz |
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13 | pitch = 2200 # in Hz |
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14 | blocksize = 256 # in samples |
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15 | duration = 0.02 # in seconds |
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16 | |
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17 | twopi = pi * 2. |
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18 | |
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19 | duration = int ( 44100 * duration ) # convert to samples |
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20 | attack = 3 |
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21 | |
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22 | period = int ( float(samplerate) / pitch ) |
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23 | sinetone = [ 0.7 * sin(twopi * i/ period) for i in range(period) ] |
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24 | sinetone *= int ( duration / period ) |
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25 | sinetone = array(sinetone, dtype = 'float32') |
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26 | |
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27 | from math import exp, e |
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28 | for i in range(len(sinetone)): |
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29 | sinetone[i] *= exp( - e * float(i) / len(sinetone)) |
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30 | for i in range(attack): |
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31 | sinetone[i] *= exp( e * (float(i) / attack - 1 ) ) |
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32 | |
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33 | my_sink = sink(sys.argv[1], 44100) |
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34 | |
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35 | i = 0 |
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36 | while i + blocksize < duration: |
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37 | my_sink(sinetone[i:i+blocksize], blocksize) |
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38 | i += blocksize |
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