Also, Telesyncs, which would be labelled TS, is when you have that high quality cam recording and sync it to a direct recording of the audio. The audio often came from the FM microbroadcast that are designed for hearing-aid users.
https://en.wikipedia.org/wiki/File:35mm_film_audio_macro.jpg Dolby Digital is an image of a digital signal (basically a QR code) that is between the cog-wheel holes on one side. Good Telecine machines are able to record the full surround track from this. That used to be the absolute best you could get while something was still in theatres. Often better than award copies, they had no stupid watermarks.