Smittix 83a54ccb20 fix: Replace coarse Scottie sync search with vectorised fine scan ...

The step-49 coarse scan introduced up to ±24 sample uncertainty in R
channel placement. When accumulated SDR clock drift pushed the actual
sync 35+ samples early in the search region, the step-49 windows could
land on the B-pixel tail and return position 0, misplacing R by ~50
samples (~16 pixel colour shift) — worse than no correction at all.

Replace with a vectorised goertzel_batch sliding-window scan at step=1
over a short window (sync_duration / 3 ≈ 3 ms), giving single-sample
accuracy. Use consumed=pos (instead of max(pos,line_samples)) when the
sync is found, so the next line starts at its correct separator and
per-line timing errors stop accumulating entirely.

Falls back to the fixed-offset path whenever the sync is not found
(e.g. noisy signal), preserving the pre-change baseline quality.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-02-19 10:29:19 +00:00

..

__init__.py

Replace broken slowrx dependency with pure Python SSTV decoder

2026-02-06 19:47:02 +00:00

constants.py

fix: Correct SSTV VIS codes and replace Goertzel pixel decoder with Hilbert transform

2026-02-19 09:23:15 +00:00

dsp.py

Replace broken slowrx dependency with pure Python SSTV decoder

2026-02-06 19:47:02 +00:00

image_decoder.py

fix: Replace coarse Scottie sync search with vectorised fine scan

2026-02-19 10:29:19 +00:00

modes.py

fix: Correct SSTV VIS codes and replace Goertzel pixel decoder with Hilbert transform

2026-02-19 09:23:15 +00:00

sstv_decoder.py

fix: Add missing SSTV mode specs for HF decoding (PD90/PD160/PD240/ScottieDX)

2026-02-18 21:29:34 +00:00

vis.py

fix: Improve HF SSTV VIS detection reliability and error correction

2026-02-18 21:52:56 +00:00