Ghost Images of Earth

When going back to look up the video made by someone who had decoded the pictures on the “Voyager golden record” back from the audio signal they were converted to in 1977, I happened to turn up another video describing the process of turning sound into scanlines in some detail. While the process used there was more like that of the people who’d decrypted the first picture from Mariner 4 using numerical printouts, scissors, tape, and crayons, the video just happened to mention someone who’d written a program in Python such that nonprogrammers could feel like they were doing something themselves given the audio file. After turning up both the program and an audio file, I decided to see if I could sort things out myself.
( Audio postcards )