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fix: morse decoder splitting dahs into dits due to mid-element signal dropout

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Add dropout tolerance (2 blocks ~40ms) to bridge brief signal gaps that
caused the state machine to chop dahs into multiple dits. Also fix scope
SNR display to use actual noise_ref instead of noise_floor.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-03-03 13:24:40 +00:00
parent 38644bced6
commit 32f04d4ed8
2 changed files with 61 additions and 7 deletions
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28
utils/morse.py
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@@ -254,6 +254,10 @@ class MorseDecoder:
self._current_symbol = ''
self._pending_buffer: list[int] = []
# Dropout tolerance: bridge brief signal dropouts mid-element (~40ms).
self._dropout_blocks: float = 0.0
self._dropout_tolerance: float = 2.0
# Output / diagnostics.
self._last_level = 0.0
self._last_noise_ref = 0.0
@@ -581,6 +585,7 @@ class MorseDecoder:
if tone_detected and not self._tone_on:
# Tone edge up.
self._tone_on = True
self._dropout_blocks = 0.0
silence_count = self._silence_blocks
self._silence_blocks = 0.0
self._tone_blocks = 0.0
@@ -615,11 +620,17 @@ class MorseDecoder:
self._record_dit_candidate(silence_count)
elif (not tone_detected) and self._tone_on:
# Tone edge down.
# Possible tone dropout — tolerate brief gaps before confirming edge-down.
self._dropout_blocks += 1.0
if self._dropout_blocks <= self._dropout_tolerance:
continue
# Confirmed tone edge down — dropout was genuine silence, not a glitch.
self._tone_on = False
tone_count = max(1.0, self._tone_blocks)
self._silence_blocks = self._dropout_blocks
self._tone_blocks = 0.0
self._silence_blocks = 0.0
self._dropout_blocks = 0.0
element = ''
if tone_count >= self._dah_threshold:
@@ -641,7 +652,9 @@ class MorseDecoder:
self._record_dit_candidate(tone_count / 3.0)
elif tone_detected and self._tone_on:
self._tone_blocks += 1.0
# Recover any dropout blocks — tone resumed, so they were part of the element.
self._tone_blocks += self._dropout_blocks + 1.0
self._dropout_blocks = 0.0
elif (not tone_detected) and (not self._tone_on):
self._silence_blocks += 1.0
@@ -668,8 +681,8 @@ class MorseDecoder:
snr_mult = max(1.15, self.threshold_multiplier * 0.5)
snr_on = snr_mult * (1.0 + self._hysteresis)
snr_off = snr_mult * (1.0 - self._hysteresis)
scope_event['snr'] = round(self._last_level / max(self._noise_floor, 1e-6), 2)
scope_event['noise_ref'] = round(self._noise_floor, 4)
scope_event['snr'] = round(self._last_level / max(self._last_noise_ref, 1e-6), 2)
scope_event['noise_ref'] = round(self._last_noise_ref, 4)
scope_event['snr_on'] = round(snr_on, 2)
scope_event['snr_off'] = round(snr_off, 2)
events.append(scope_event)
@@ -680,8 +693,8 @@ class MorseDecoder:
"""Flush pending symbols at end-of-stream."""
events: list[dict[str, Any]] = []
if self._tone_on and self._tone_blocks >= self._dit_min:
tone_count = self._tone_blocks
if self._tone_on and (self._tone_blocks + self._dropout_blocks) >= self._dit_min:
tone_count = self._tone_blocks + self._dropout_blocks
element = '-' if tone_count >= self._dah_threshold else '.'
self._current_symbol += element
events.append({
@@ -699,6 +712,7 @@ class MorseDecoder:
self._tone_on = False
self._tone_blocks = 0.0
self._silence_blocks = 0.0
self._dropout_blocks = 0.0
return events