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corrected antialiasing algorithm

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András Veres-Szentkirályi 2013-05-23 14:03:25 +02:00
parent a70cf86f0d
commit 3a10ec83f0
1 changed files with 2 additions and 2 deletions
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4
sstv.py
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@ -57,7 +57,7 @@ class SSTV(object):
lowest = -amp lowest = -amp
highest = amp - 1 highest = amp - 1
for value in self.gen_values(): for value in self.gen_values():
sample = int(round(value * amp + alias * random())) sample = int(round(value * amp + alias * (random() - 0.5)))
yield max(min(highest, sample), lowest) yield max(min(highest, sample), lowest)
def gen_values(self): def gen_values(self):
@ -66,7 +66,7 @@ class SSTV(object):
param = 0 param = 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 + random()))): for sample in xrange(int(round(spms * msec + random() - 0.5))):
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)