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SSTV.gen_values: even out fraction samples

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András Veres-Szentkirályi 2013-05-30 21:11:19 +02:00
parent bc247c6fde
commit e2871bf011
1 changed files with 6 additions and 2 deletions
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8
sstv.py
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@ -1,7 +1,7 @@
#!/usr/bin/env python #!/usr/bin/env python
from __future__ import division, with_statement from __future__ import division, with_statement
from math import sin, pi from math import sin, pi, floor
from random import random from random import random
import struct import struct
@ -58,12 +58,16 @@ class SSTV(object):
"""generates -1 .. +1 values from freq_bits""" """generates -1 .. +1 values from freq_bits"""
spms = self.samples_per_sec / 1000 spms = self.samples_per_sec / 1000
param = 0 param = 0
samples = 0
for freq, msec in self.gen_freq_bits(): for freq, msec in self.gen_freq_bits():
offset = param offset = param
for sample in xrange(int(round(spms * msec))): samples += spms * msec
tx = floor(samples)
for sample in xrange(int(tx)):
t = sample / self.samples_per_sec t = sample / self.samples_per_sec
param = t * freq * 2 * pi + offset param = t * freq * 2 * pi + offset
yield sin(param) yield sin(param)
samples -= tx
def gen_freq_bits(self): def gen_freq_bits(self):
"""generates (freq, msec) tuples from image""" """generates (freq, msec) tuples from image"""