Two great examples of extracting unusual extra info from an old recorded signal. Does anyone know of more?
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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
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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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You could technically recreate images from recordings of the emissions from CRT screens. As an example this program transmits am radio from a crt: http://www.erikyyy.de/tempest/
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That’s pretty interesting. Reminds me of hiding malware instructions in slight variations of GIF pixels.
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Here's another one. Old Russian colour photographs that were taken before colour printing even existed. The theory was there so the photographer took 3 photos with R,G,B filters and much later other people merged to form full colour photos.https://www.washingtonpost.com/news/in-sight/wp/2016/04/19/what-russia-looked-like-before-1914-in-color/?utm_term=.d9baf1fe824c …
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Those are great, but he was able to project them at the time with magic lanterns, though?
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