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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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Original Message
Synchronous upsampling/Synchronicity?
Posted by Ray Jr. on June 30, 2001 at 00:55:31:
Well, MSB has a new upgrade (MSB Technology Link DAC III with 24/192 Input Option) that uses a synchronous upsampler: “The simpler math of synchronous upsampling (the new rate is an even multiple of the old) retains all data points of the original stream. It merely interpolates additional ones between them. Asynchronous upsampling involves total signal reconstruction, however. In other words, all original data points are discarded and replaced with new ones. That’s exactly what Jeffrey Kalt of Resolution Audio had pointed out in my earlier article as well. John Stronczer of Bel Canto Design, of course, had a retort. The computing power of modern chips, he argued, renders the entire subject of exactly what conversion frequency is chosen a mute point. I read up on the installation specs of Analog Devices’ AD1896 chip (supports all frequencies up to 192kHz). This confirmed that the manufacturers of the actual chip sets feel the same way as Stronczer. Our remote e-mail debate left me then and now with only my own two ears to decide what really gives. Just for the record, I do have an assumption. Superior results are a function of skillful implementation rather than subscription to any particular approach..†There’s a full explanation at: http://www.soundstage.com/earmarked/
The Crystal CS 8420, which is an asynchronous upsampler, is commonly used by EVS, Bel-Canto, Perpetual Technologies and MSB "other" DAC's as well. Audio Note kit 1.1 interestingly uses a “1x over sampling technique†and has gotten some rave reviews as well: http://www.enjoythemusic.com/magazine/equipment/0200/anmeetsmsb.htm
Thorsten may have a good point in what he says; asynchronous upsampling can have its drawbacks… Plus that old “Barnum effect†can really drain your wallet. Music is a hobby to be enjoyed. MSB’s approach is very interesting though, and would be more immune to becoming an “antique†within 18 months…
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