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comparison tools/gen_sound.py @ 245:f87a3485d927

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Add tool for making beeps
author Neil Muller <neil@dip.sun.ac.za>
date Fri, 27 Aug 2010 13:22:32 +0200
parents
children 913257638e6f
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244:cc478e3a951e 245:f87a3485d927
1 # Generate 'perfect' sine wave sounds
2
3 # Design notes: produces ~= 0.5s raw CDDA audio - 44100 Hz, 16 bit signed values
4 # Input is freq in Hz - 440 for A, etc. - must be an integer
5 # Output is written the file beep<freq>.pcm
6 # Convert to ogg with oggenc -r <file>
7
8 import sys
9 import math
10 import struct
11
12
13 CDDA_RATE = 44100
14 MAX = 105*256 # Max value for sine wave
15
16 def gen_sine(freq):
17 filename = 'beep%s.pcm' % freq
18 # We need to generate freq cycles and sample that CDDA_RATE times
19 samples_per_cycle = CDDA_RATE / freq
20 data = []
21 for x in range(samples_per_cycle):
22 rad = float(x) / samples_per_cycle * 2 * math.pi
23 y = MAX * math.sin(rad)
24 data.append(struct.pack('<i', y))
25 output = open(filename, 'w')
26 for x in range(freq/2):
27 output.write(''.join(data))
28 output.close()
29
30
31 if __name__ == "__main__":
32 freq = int(sys.argv[1])
33 gen_sine(freq)