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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Replying to @mwichary
Beta VCRs used to record Teletext almost flawlessly! Most VHS ones didn't quite have enough bandwidth, so you were lucky.
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