Task list status:

• source boards
• test MTK3339 GPS module indoor fixing ability
• test SAMD21 direct digital synthesis (DDS) of a sin sync pulse with its 10 bits DAC.
• test SAMD21 hardware interrupts handling with the 1PPS signal
• buy a copy of AoE third edition
• research analog stage configuration
• order some LM358 (with extra magic smoke in them)
• move project home from Blogger (!) to Hackaday
• test waveform analysis on Kdenlive
• research NLEs handling of timecode metadata
• launch gitlab repository
  • for firmware
  • for PPSSoundmerge python desktop post-prod script
• final Arduino coding:
  • code NMEA parsing on UART (use Adafruit lib?)
  • code UTC time DDS FSK modulation to DAC
• desktop python coding:
  •   audio track analysis:
  • sync pulse detection
  • word decoding
  •   merge synced tracks with ffmpeg-python ⇦ I'M HERE
• analog stage:
  • measure some input impedances (cam and audio recorder)
  • implement reference voltage for true audio AC with LM358
  • test mic level output
  • test line level output
  • test small speaker for acoustic coupling

Maybe I shouldn't reveal I've been researching this project for ten years! It would cast a shadow over my capacity to deliver... 8-) But you wouldn't have access to my treasure trove of related links...

The first traces of my journey are links kept on Delicious, now Pinboard: they are tagged smpte and date back to 2011. I later diversified my classification and introduced year after year more nuanced tags, here are direct links to them: (this is stratigraphic information paleontology!)

• smpte
• timecode
• ltc
• audio.sync
• atomic synchronator

From now on, maybe the project will stall again... I'm back to school this January after a sabbatical semester (ducking down during COVID: I just can't stand doing zoom classes), we'll see.