On: Extracting Audio from Pictures (2012)

[skookumchuck]

While the author used software to retrieve the sound, I bet it could be done with photochemical methods onto a copper disk, similar to how circuit boards are etched.

Or how soundtracks are photographed onto movie film.

[ada1981 → skookumchuck]

I never thought about this until your comment. Fascinating!

https://en.m.wikipedia.org/wiki/Sound-on-film

I'm blown away by the complexity of sound that can be conveyed in what seems a simple manner.

[jacquesm → ada1981]

That's because in essence even the most complex sounds change just one environmental variable: local air pressure.

[ada1981 → jacquesm]

I'm falling in love with sound all over again. Yes, that is obvious now that you say it, but I never realized it before. Thanks!