When the Voyager probes take a picture or record other data, do they digitize it on board and send a digital signal to earth (i.e. zeros and ones) or do they transmit an analogue signal (like old-fashioned radio or television) that is only digitized on arrival on earth?
I found a question on the cameras and on the signals themselves, that summarized the information I could find searching the web. Apparently, sensor data is transmitted continuously whereas images are buffered on tape. I could, however, not find any information on the encoding used.