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/Chapter18_Using-Flash-Program-Memory/talkingVoltmeter/cornell/dpcm_2bit/sineWave.py

https://gitlab.com/jack/AVR-Programming
Python | 38 lines | 32 code | 4 blank | 2 comment | 0 complexity | c7c8d07a9ec40eb0a3de5c1e405e5c8c MD5 | raw file
    

  1. ## Demo python program to create sine wave
    2. 

  2. 

  3. from struct import pack, unpack
    4. 

  4. from math import sin, pi
    5. 

  5. import wave
    6. 

  6. import os
    7. 

  7. import random
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  8. 

  9. 

  10. RATE = 44100
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  11. 

  12. ## GENERATE MONO FILE ##
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  13. wv = wave.open('test_mono.wav', 'w')
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  14. wv.setparams((1, 2, RATE, 0, 'NONE', 'not compressed'))
    15. 

  15. maxVol=2**15-1.0 #maximum amplitude
    16. 

  16. wvData=""
    17. 

  17. for i in range(0, RATE*3):
    18. 

  18.     wvData+=pack('h', maxVol*sin(2*pi*i*440.0/RATE))
    19. 

  19. 

  20. wv.writeframes(wvData)
    21. 

  21. wv.close()
    22. 

  22. os.system("mplayer test_mono.wav")
    23. 

  23. 

  24. ## GENERATE STEREO FILE ##
    25. 

  25. wv = wave.open('test_stereo.wav', 'w')
    26. 

  26. wv.setparams((2, 2, RATE, 0, 'NONE', 'not compressed'))
    27. 

  27. maxVol=2**15-1.0 #maximum amplitude
    28. 

  28. waveData = ""
    29. 

  29. for i in range(0, RATE*3):
    30. 

  30.     t = 2*pi*i/RATE             # time-step in radians*sec
    31. 

  31.     waveData+=pack('h', maxVol*sin(t*440.0)) #440Hz left
    32. 

  32.     waveData+=pack('h', maxVol*sin(t*220.0)) #220Hz right
    33. 

  33.     
    34. 

  34. 

  35. wv.writeframes(waveData)
    36. 

  36. wv.close()
    37. 

  37. os.system("mplayer test_stereo.wav")
    38. 

  38. 

  39.