Extracting Audio from Pictures of Gramophone Recordings
Well <i>that's</i> a good hack!! <i>that's</i> why I read HN, not for some Arrington story.<p>I wouldn't have guessed there was enough data left in the picture of the gramophone track to recreate audio from it.<p>Which makes me think about Shannon theorem - my guesses would have been wrong, so I wonder just "how wrong".<p>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)<p>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.<p>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.<p>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- <a href="http://xkcd.com/356/" rel="nofollow">http://xkcd.com/356/</a>)<p>That's the kind of article I love :-)<p>EDIT: downvotes, whatever. Haters gonna hate. I'll have some hours of fun thanks to this article anyway!