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Originally Posted by G8HQP Dave
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OK - I hear you say "This is digital - it is 0's and 1's". Well it might be at one point, but I'd invite you to look at an eye diagram for the analogue output from the photodiodes in a CD mechanism. A CD mechanism is analogue through and through. Focus, tracking and data.
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Error correction means that the data entering the DAC is perfect almost all of the time. |
All the right bits, necessarily in the right order, but with timing jitter. That's analogue, and measurable, and has a mathematically demonstrable effect on the audio output - a sort of phase modulation, effectively. It'a also an issue for self-clocking digital audio interfaces like SPDIF, either electrical or optical. Of course, buffering the data and re-clocking it from a low-jitter source fixes the problem, but very few DACs bother with that.
Whether we can hear the effect or not is another matter.
Chris