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tweak timing recovery parameters

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This commit is contained in:
Jakob Ketterl 2023-08-21 17:30:07 +02:00
parent 5997923f36
commit c1bfb480e7
1 changed files with 4 additions and 2 deletions
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6
csdr/chain/digimodes.py
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@ -95,11 +95,12 @@ class RttyDemodulator(SecondaryDemodulator, SecondarySelectorChain):
self.sampleRate = 12000
secondary_samples_per_bit = int(round(self.sampleRate / self.baudRate))
cutoff = self.baudRate / self.sampleRate
loop_gain = self.sampleRate / self.getBandwidth() / 5
workers = [
Agc(Format.COMPLEX_FLOAT),
FmDemod(),
Lowpass(Format.FLOAT, cutoff),
TimingRecovery(Format.FLOAT, secondary_samples_per_bit, 5, 2),
TimingRecovery(Format.FLOAT, secondary_samples_per_bit, loop_gain, 10),
RttyDecoder(invert),
BaudotDecoder(),
]
@ -114,5 +115,6 @@ class RttyDemodulator(SecondaryDemodulator, SecondarySelectorChain):
self.sampleRate = sampleRate
secondary_samples_per_bit = int(round(self.sampleRate / self.baudRate))
cutoff = self.baudRate / self.sampleRate
loop_gain = self.sampleRate / self.getBandwidth() / 5
self.replace(2, Lowpass(Format.FLOAT, cutoff))
self.replace(3, TimingRecovery(Format.FLOAT, secondary_samples_per_bit, 5, 2))
self.replace(3, TimingRecovery(Format.FLOAT, secondary_samples_per_bit, loop_gain, 10))