# Frigate interior audio

The mechanical ambience and foley are edited real-world recordings. They are
not AI-generated sound effects. All external sources below are released under
CC0 1.0: https://creativecommons.org/publicdomain/zero/1.0/

- **LEGIT Audio — The Shop, free OpenGameArt samples**
  https://opengameart.org/content/the-shop
  Recordings: `TheShopCollection_convenience_store_drinks_fridge_drone.wav`
  and `TheShopCollection_convenience_store_drinks_fridge_drone_2.wav`.
  Used for reactor and ventilation beds. CC0 applies specifically to the free
  files published on OpenGameArt, not to other commercial LEGIT Audio products.
- **bart — 68 Workshop Sounds**
  https://opengameart.org/content/68-workshop-sounds
  Garage recordings of real tools and metal. Used for motor tools, ratchets,
  tapping, clattering, sliding metal and latches.
- **bart — Steam release sounds**
  https://opengameart.org/content/steam-release-sounds
  Used for pressure equalization, valves and airlock seals.
- **Kenney — Sci-Fi Sounds**
  https://opengameart.org/content/sci-fi-sounds
  https://kenney.nl/assets/sci-fi-sounds
  `computerNoise_000.ogg`, `computerNoise_001.ogg`: quiet console electronics.

The two-tone service annunciator is original procedural sound design. It is
intentionally electronic, like a real control-panel chime.

Edits: trimming, DC removal, filtering, mild pitch reduction, layer timing,
short stereo room reflections, loop crossfades and level normalization.
`manifest.json` maps each final asset to its source recordings and processing.
Rebuild using `tools/audio/fetch_freighter_sources.py` followed by
`tools/audio/build_freighter_audio.py` (Python + numpy).