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In Reply to: oh, by the way, even 90dB is actually a very *good* S/N ratio posted by Christine Tham on January 30, 2003 at 14:09:12:
Once the signal is analog you're correct Christine, because you can hear well below the noise floor. However, a 90 dB S/N ratio is not as good as CD - and S/N ratio is critical with digital sources..
Follow Ups:
sony/phillips deliberately contoured the noise shaping curve of sacd so that it matches or equal cd s/n ratio in the worst possible scenario, which means typically the s/n ratio is better than cd.
SACD players have a lower S/N ratio than CD above 10 kHz or so, or JA is misleading us. How can you possibly misundertand that?
as i recall (which may be incorrect), the cd digital audio format was designed with a goal of 90dB S/N ratio.the fact that many cd players exceed the design goal is due to techniques such as oversampling.
what i stated was that i believe sony/phillips designed dsd to be no worse than the cd spec (ie. 90dB) in the worst case.
in which case, any s/n ratio better than 90dB is "per spec" in my opinion.
i could of course be wrong and will be happy for someone to point this out. but until then, i am not concerned with the results in stereophile since i don't believe they subjectively impact the listening experience (as stereophile themselves point out).
It shows that DSD has a lower noise/resolution above 10kHz or so than a 16 bit pcm signal.Redbook players with 1 bit dac's and noise shaping show the same noisespectrum but with a rising curve in a higher frequency range.
That's because the 1 bit dac's usually oversample at 128 or 256 times.
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