This is an extension to my previous video about this Harman Kardon ADP 303.
What is the difference between an AC-3 decoder and an AC-3 RF decoder? Why would we ever need to use this ADP 303 when most surround receivers already have AC-3 (Dolby Digital) decoding built in?
The answer to these questions can be found in this video.
Here is the repair of this Harman Kardon ADP 303:
Dolby Pro Logic (Dolby Surround):
Dolby AC-3 (Dolby Digital):
How audio is stored on laserdiscs:
PCM (Pulse-code modulation):