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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: Nyquist Theorem is valid posted by Todd Krieger on November 21, 2015 at 13:48:17:
Feanor: "However the trick part, I would surmise, has always been the filtering of frequencies above the maximum target frequency, (22kHz for Redbook), that are just noise. The advantage of high resolution is in this realm, i.e. it is easier to design filters with fewer artifacts, (such as phase shift or ringing), when the digital frequencies are higher to begin with."Todd: "If the sample rate is high enough, I think all filtering could be analog, which would significantly simply the process....."
This is the approach take by the new PS Audio NuWave DSD; it oversamples, does DAC using delta-sigma, then uses an analog filter.
Feanor: "I might suggest, as a non-expert, that advances in DAC design are almost entirely a matter of filtering with fewer artifacts. BTW, I'm extremely pleased with my Schiit Bifrost Multibit with its 'closed form' filtering; the level of realism is astonishing, at least at that price point."
Todd: "At the 44.1 kHz sample rate, there is no filter that is "good enough" to where it would be indistinguishable from 15 ips analog tape.... The filters have advanced to where the obtrusiveness at HF has become tolerable in a lot of cases. But still not completely transparent. (Vinyl tells me this whenever I listen to it.) Schiit is one of the better recent products.
...
The high-rez movement was based on the notion that the resolution of 16/44 Redbook CD wasn't sufficient for true high-fidelity audio playback. I agree with that notion personally, but I've yet to experience a high-resolution digital format that I prefer over CD."The Schiit approach is quite different from PSA's NuWave approach. Schiit oversamples and uses a "closed-form" filter that preserves the original PCM data points, then uses a high-accuracy R2R (ladder) DAC. I haven't heard the NuWave but the Bifrost Multibit is remarkably good, especially with 16/44.1. I'd love the hear Schiit's more up-market Gungnir Multibit or Yggdrasil that use the same principles, but they are out my price range unfortunately.
Dmitri Shostakovich
Edits: 11/22/15
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- Reply to Todd Krieger - Feanor 05:21:39 11/22/15 (0)
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