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Define the hsync tolerance in RFDecode class #457

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Feb 7, 2020
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Define the hsync tolerance in RFDecode class #457

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7 changes: 6 additions & 1 deletion lddecode/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -331,6 +331,11 @@ def __init__(self, inputfreq = 40, system = 'NTSC', blocklen = 32*1024, decode_d

linelen = self.freq_hz/(1000000.0/self.SysParams['line_period'])
self.linelen = int(np.round(linelen))
# How much horizontal sync position can deviate from previous/expected position
#and still be interpreted as a horizontal sync pulse.
# Too high tolerance may result in false positive sync pulses, too low may end up missing them.
# Tapes will need a wider tolerance than laserdiscs due to head switch etc.
self.hsync_tolerance = .4

self.decode_digital_audio = decode_digital_audio
self.decode_analog_audio = decode_analog_audio
Expand Down Expand Up @@ -1656,7 +1661,7 @@ def compute_linelocs(self):
#print(p, lineloc, rlineloc, lineloc_distance)

# only record if it's closer to the (probable) beginning of the line
if lineloc_distance > .4 or (rlineloc in linelocs_dict and lineloc_distance > linelocs_dist[rlineloc]):
if lineloc_distance > self.rf.hsync_tolerance or (rlineloc in linelocs_dict and lineloc_distance > linelocs_dist[rlineloc]):
#print(rlineloc, p, 'reject')
continue

Expand Down