I will be connecting my DSR 505 to my new Yamaha RXV1800 reciever using a digital optical cable (Toslink).
I understand that PCM is uncompressed, whereas dolby digital signals need to be decoded by the A/V reciever.
I'm confused as to which output setting I need to use for my setup? I have a 5.1 speaker setup connected to the reciever. If the tv program is being broadcast in 5.1, do I need to have dolby digital selected in order to hear the discrete channels?
Regarding "why?", PCM contains L+R only, uncompressed. Back in the days of the 401, it was one or the other, and the L+R analog would only work on PCM. This made it quite obvious as to what was going out of the fiber.
Ok so if I leave the setting at dolby digital output for 5.1 sound, then what happens with all the other programs with regular 2 ch stereo? Will I still get sound through the receiver, or do I have to keep switching back to PCM for regular 2 ch stereo? I sure hope I don't have to keep switching between the two output settings. That would be a big PITA.
Starchoice uses DD a their native audio format. Selecting DD outputs that native DD stream, whatver its capacity (1.0, 2.0 , 5.1, or other).
PCM downconverts 5.1 to Pro-logic, or outputs the native 1.0 as two identical channels, or 2.0 as stereo (with whatever encoding was on it).