Two great examples of extracting unusual extra info from an old recorded signal. Does anyone know of more?
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1. Retrieving full colour from a black-and-white recording of an old TV show (e.g. Doctor Who). The b&w recording has barely visible “chroma dots” that were unavoidable artifacts of transmitting colour signal – but now they can be used in reconstruction. https://en.wikipedia.org/wiki/Colour_recovery …pic.twitter.com/j1gvefNkS1
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2. Recovering advanced teletext with more colors from an old VHS recording. The advanced teletext was supported by few TVs then (in 1995), but the work means it can be seen by more people now. http://text-mode.tumblr.com/post/182010051418/in-1995-some-countries-started-to-broadcast-a-new …pic.twitter.com/VCcNGgg2AC
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Marcin Wichary Retweeted Adrian Holovaty
3. Apparently there are ways to recover sound based on vibrations of the objects in recorded video – great with high-speed camera, but can work even with regular 60fps video (and be used for spying!). (thx
@adrianholovaty)https://twitter.com/adrianholovaty/status/1085426605403660294?s=21 …Marcin Wichary added,
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4. Not quite new unexpected info, but re-running the tapes of lunar landings again to achieve higher quality and see meteor activity on the lunar surface more precisely. (Fascinating project!) (thx
@Infoseepage) https://www.computerworld.com/article/2525935/computer-hardware/the-lost-nasa-tapes--restoring-lunar-images-after-40-years-in-the-vault.html …pic.twitter.com/Xrx0CAtV6R
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5. Somewhat similar: playing back recorded audio that couldn’t be played back at the time because the tech didn’t exist yet – includes audio of a few people singing in 1860 (!). (thx
@multikev)https://www.economist.com/babbage/2011/07/12/the-written-sound …3 replies 6 retweets 28 likesShow this thread -
6. Original copies of Mike Oldfield’s album “Tubular Bells” were made near a VLF transmitter and inadvertently contain a secret Morse code transmission – which someone only realized much later. https://hamgear.wordpress.com/2015/03/09/tubular-bells-and-vlf-interference/ … (thx
@yorgle)4 replies 9 retweets 32 likesShow this thread
7. Of course, in the modern world there are also parallel issues, such as this AOL snafu from a decade ago:https://www.cnet.com/news/aol-apologizes-for-release-of-user-search-data/ …
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