1) Decode digital signal from supplier. This is
MPEG2 from Dish Network, similar from DTV and
cable companies.
2) Decode HDTV signal if available. Splits it
into analog video component out (or VGA) and DD
audio.
3) Decode DD audio, send it out the digital output.
Or downconvert it to stereo for the analog output.
BTW, there's a tuner in between 1 and 2.
My digital cable box is decoding a digital signal from my cable company. They have what is referred to as a 750 Mhz system. So that box can decode any channel frequency up to 750Mhz, correct? DTV channels may fall within 750Mhz, but what if they're not a recognizable digital signal? Sort of like USB and Firewire are both digital signals, but not interchangable. If SA equipment is used to encode the signal at the headend, then send it out to SA boxes for decoding...and Motorola equipment is used to encode boxes in AT&T's headend, to send out to Motorola boxes for decoding...perhaps they use special ways of encoding the digital signal that is not the same as DTV signals. Does this make any sense or do I just sound like a babbling idiot?
