Smittix 0dc40bbea3 fix: Correct Scottie SSTV image slant by resyncing to mid-line sync pulse ...

Scottie modes place their horizontal sync pulse between the Blue and Red
channels. The decoder was using a fixed offset to skip over it, so any
SDR clock error accumulated line-by-line and produced a visible diagonal
slant in the decoded image.

Fix: search for the actual 1200 Hz sync pulse in a ±10% window around
the expected position before decoding the Red channel, then align to the
real pulse. This resets accumulated clock drift on every scanline, the
same way Martin and Robot modes already handle their front-of-line sync.

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

2026-02-19 09:54:28 +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: Correct Scottie SSTV image slant by resyncing to mid-line sync pulse

2026-02-19 09:54:28 +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