Extracting Audio from Pictures of Gramophone Recordings
Well that's a good hack!! that's why I read HN, not for some Arrington story.I wouldn't have guessed there was enough data left in the picture of the gramophone track to recreate audio from it.Which makes me think about Shannon theorem - my guesses would have been wrong, so I wonder just "how wrong".What would the minimal resolution (dpi) be to store say 1 minute of audio at 8Hz? Would there be an easy way to calculate that (just a back of the envelope calculation, to get a rough idea)What was the resolution of the printing press ca 1880, to know how much audio could have been "stored" in a single page for posterity? In the picture there is a lot of text, so obviously a lot of lost space.And I wonder how we could make 2d barcodes to store uncompressed wav audio, which might be more resistant to noise, but only because it'll be like a "lower resolution", ie less easily disruptible. Which leads me back to Shannon.I'm not into audio processing but that raises a lot of questions I'll be pondering over with some coffee tonight (obligatory xkcd reference- http://xkcd.com/356/)That's the kind of article I love :-)EDIT: downvotes, whatever. Haters gonna hate. I'll have some hours of fun thanks to this article anyway!