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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: Does a good output stage add much cost to a DAC? posted by rick_m on January 14, 2012 at 22:59:34:
"Since audio systems are an open-loop chain from the signal's perspective, it doesn't matter where things go astray, if it happens the deed is done and no succeeding processes are going to make it whole again."
While this is true with analog signals which require and assume linear processing, this statement is untrue where digital signals are involved. One can corrupt a digital signal by adding a modest amount of noise to it, but this noise can be eliminated by passing it through a stage of signal restoration, something that is part of any active inverter or logic gate (but not a simple MOS pass transistor).
There are limits, of course, on how strong this noise can be in digital circuitry. If the distribution of noise amplitude is limited to a suitable range (as is the case with deterministic noise) then the noise can be reduced below any desired threshold by employing multiple stages of signal restoration, i.e. it is gone. If the distribution of noise amplitude is random then it won't be possible to completely eliminate the possibility that the restoration circuitry will make an error, but in practice digital circuitry is designed so the probability of this is extremely low (e.g. one error in 10^18 bits, more than a lifetime of listening to music).
The audiophile myth "everything matters" is simply not true except as a self-defeating prophecy.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Does a good output stage add much cost to a DAC? - Tony Lauck 08:15:25 01/15/12 (2)
- "The audiophile myth "everything matters" is simply not true except as a self-defeating prophecy." Huh? - Vic D 19:00:49 01/15/12 (1)
- RE: "The audiophile myth "everything matters" is simply not true except as a self-defeating prophecy." Huh? - Tony Lauck 19:44:43 01/15/12 (0)
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