Hamming codes
at least three on U tube to keep you off the street
1980 - wasnt there a Mars/Mercury probe? anyway the strength of the sigmal was around a trillionth of a watt - that's very small, reader - and so an error-correcting code was used
honestly someone asked -and this is how they recd weak signals from very far away.
so that is the Jupiter or Mars bit done (*)
haslingdon - I will have to think about that one
(*) for some reason they did this ( hamming error correcting codes) in O.U.Maff 206, which I did around 1983.
You remember The Memorandum, Warren Mitchell played Thumb, about the office language, Ptydepe ? ( tie-deep in English but puh-tee-deppay in Czech) in which it was written by Vaclav Havel, later first president of the independent republic?
https://mubi.com/films/the-memorandum
each word is 60% different from each other for max comprehension.
gh ( guh-huh) is used for 'productivity' - the commonest word
same principle in Hamming codes