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What is the point of upsampling?
- Thread starter Tks
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Again, the ESS DAC’s already do it for you.. and the sample rate is even much, much higher than 195 kHz.You can read the Benchmark link I posted in the quoted message.
This is from Hi-Fi News' test of the Weiss DAC501:
There's a note buried in Weiss's technical white paper alluding to the DAC50x's use of an asymmetric/off-centre re-clocking frequency (195kHz) – a technique also employed by Hegel.
Weiss DAC501 USB/network DAC Lab Report
So these measurements might be compared with those of competing DACs, Weiss's various DSP plug-ins were defeated and the 'Main Level' set at '0dB'. The maximum 6.67V, phase-positive, balanced analogue output is delivered via a very uniform 45ohm source impedance and, courtesy of the output...www.hifinews.com
Besides, we haven’t seen any super special jitter performance from any of these devices, nor do the ESS DAC’s seem to do better than the SOTA AKMs.
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tuga
Major Contributor
Weiss and Siau have chosen to do it for a reason and I presume with performance gains. Are you suggesting that they’re wrong (and you know better)?
I’m suggesting that they have a nice marketing story. If they are so sure that they are right, they can show some measurements.
tuga
Major Contributor
Benchmark and Weiss DACs produce top measurements.
Sure, but better than others? And if so, is that attributable to the jitter story?
tuga
Major Contributor
They claim that it improves their implementation. That's all that matters, really. You will never be able to confirm this unless they publish measurements. You can't compare with other DACs, too many variables at play.
Lots of companies claim all kinds of things… just because some actually make good products does not mean the claims are also true.
That’s exactly what I asked for
tuga
Major Contributor
This is where I disagree. I don't think that either Weiss nor Benchmark make high performance products by accident.
Yes it would be nice to see proof of their claims but if I remember correctly the Benchmark DAC 1 was the benchmark when it came out in several measured parameters including jitter.
tuga
Major Contributor
Well, yes. It doesn't prove any of the specific claims they made. All we have is their word for it. Around here, that usually means you'll need to do better. Why would these companies get a free pass?
tuga
Major Contributor
I don't think that they claim it's the best approach. They merely inform us that it is their chosen approach (Weiss doesn't even do that). The measured performance speaks for itself. I find this ASR Mythbuster posture a bit tiresome to be honest. It's up there with the "bits is bits" dogma.
I think it is an unavoidable part of the "Science" part of the forum name.
What dogma would that be?
notsodeadlizard
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tuga
Major Contributor
Do it through measurements. No need for snarky remarks and the paranoid attitude.
That digital transmission and decoding/conversion is perfect. Or even audibly prefect.
Some professional DAC developers (whatever that means) think oversampling and delta-sigma are evil…. So yeah, answers will always be varied.
tuga
Major Contributor
Siau, Carsten and Loesch, also Brüggemann and Laako have posted here (but may have been driven away).
KSTR
Major Contributor
The main purpose of oversampling in DACs and ADCs has been explained many times: Reduce the constraints for the analog anti-aliasing (for ADCs) and anti-imaging (for DACs) filters. With oversampling the bulk of the filtering can be done in the digital domain, allowing much steeper filters -- up to the theoretical ideal, the true sinc() filter.
Off-chip oversampling and filtering offers a way to realize arbitrary and supposedly better filters than on-chip filters which are limited by hardware resources and practical constraints.
en.wikipedia.org
Off-chip oversampling and filtering offers a way to realize arbitrary and supposedly better filters than on-chip filters which are limited by hardware resources and practical constraints.
Oversampling - Wikipedia
The first DAC I designed was back in the 70's (R2R ladder), but who is counting...
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