Sources and licenses for /remove-background-noise/ samples and walkthrough
Prepared October 19, 2026. Each excerpt below was cut from the source (decode only), restored in the Diffio web app
with Diffio 4.5 Pro on October 19, 2026, and exported as "Restored speech" and "Background noise" WAVs.
The page files are mono MP3 at 96 kb/s. One fixed gain per track matches the loudness of the original and the
restored speech within each sample (between about -20 and -24 LUFS); the background track uses the restored speech's gain so the Background amount mix
matches the app. No compression, limiting, EQ or other processing. Details: manifest.json.
None of the people or organizations below are Diffio customers or endorse Diffio.

1. Wind and surf (beach-wind-*.mp3, and the walkthrough from 0:00)
   "Ocean pollution in Ghana" by Esthee2010, Wikimedia Commons, July 28, 2024.
   https://commons.wikimedia.org/wiki/File:Ocean_pollution_in_Ghana.webm
   License: CC BY-SA 4.0, https://creativecommons.org/licenses/by-sa/4.0/
   Excerpt: 57.9 to 73.0 s of the audio. Changes: excerpted, downmixed to mono, speech restored with Diffio, level matched.
   The excerpt and the restored versions are shared under CC BY-SA 4.0.

2. Diner chatter (storm-diner-*.mp3, and the walkthrough at 0:24)
   "When a Hurricane Strikes, Weather the Storm With Waffles", VOA News, September 14, 2018, via Wikimedia Commons.
   A hospital dialysis worker on a break at a diner in Goldsboro, North Carolina, during Hurricane Florence.
   https://commons.wikimedia.org/wiki/File:When_a_Hurricane_Strikes,_Weather_the_Storm_With_Waffles.webm
   License: public domain (work of Voice of America, a U.S. government agency). VOA does not endorse Diffio.
   Excerpt: 61.95 to 79.30 s of the audio. Changes: excerpted, downmixed to mono, speech restored with Diffio, level matched.

3. Street noise (night-street-*.mp3, and the walkthrough at 0:33)
   "Jeff-Walkabout-Denver.mp3" by kerouacsamerica (Kerouac's America, SUNY Potsdam), Freesound.
   A student on the project narrating a walk down Market Street in Denver at night.
   https://freesound.org/people/kerouacsamerica/sounds/31523/
   License: CC BY 3.0, https://creativecommons.org/licenses/by/3.0/
   Excerpt: 6.6 to 22.8 s of the Freesound high-quality preview, left channel only (the right channel is the left
   channel with inverted polarity, so a mono mix of both cancels the voice). Changes: excerpted, left channel taken,
   speech restored with Diffio, level matched.

4. Fans and air handling (station-fans-*.mp3)
   "Crew Quarters Tour Inside the Space Station", NASA Johnson Space Center, January 2014, via Wikimedia Commons.
   https://commons.wikimedia.org/wiki/File:Crew_Quarters_Tour_Inside_the_Space_Station.webm
   License: public domain (work of NASA). NASA does not endorse Diffio.
   Excerpt: 17.5 to 33.7 s of the audio. Changes: excerpted, downmixed to mono, speech restored with Diffio, level matched.

5. App screenshots (app-*.webp, walkthrough video)
   Diffio's own app, captured October 19, 2026 from a local test account ("UI Preview") on the current app build.

Walkthrough video (walkthrough.mp4, walkthrough.webm, walkthrough-poster.webp)
   Built with HyperFrames from the screenshots above and audio from sources 1 to 3, cut as listed in
   walkthrough-transcript.txt. The video's audio from source 1 is shared under its CC BY-SA 4.0 license.