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If the source is digital (from your hard-drive, CDs, etc is) then there will never be analogue to digital conversion.if the noise is created BEFORE being output, then yes a digital signal will send noise. for example, if the audio codec converts from analogue to digital before it reaches the digital output.
it's just a carrier, after all.
@Avenger
Bits do actually flip occasionally as a result of noise, it's just that it is quite hard to generate so much noise that a bit flips. Most digital transport protocols have some mechanisms in place to correct for that anyways.