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Upsampling DACS: Take the Pepsi Challenge

HAs anyone used 2 of the following 3 relatively inexpensive upsampling DACs: Perpetual technologies, Bel Canto, MSB Link 3 with upsampling upgrade?? I am trying to sort out the details of the new technologies. The Perp Tech can "interpolate", while the others do not. I am under the impression that the "24 bit" part of this new technology has to do with s/n ratios aroung 140 db, which is great, but a little useless considering the other equipment in the system. The sampling freq is the part that has me all aflutter, because it seems to be getting closer to analog quality "infinite sampling" if you will... What do you think? Has anyone compared these dacs?? Thanks, gang.
gthirteen
greysquirrel
62 posts
 
Carl, a couple of points for your "gray area": 1.) oversampling/upsampling without "interpolation" is meaningless!!! Interpolation is simply selecting the best bit value to assign to an oversampled data point. You could linearly "interpolate" between (real/original) data points or you could fit some base curve between those data points. If you increase the sample rate, you MUST interpolate! 2.) The ONLY difference Kevin Halverson mentioned was semantic (and I'm sure he meant it as such)!! "Upsampling" units started as stand alone oversampling digital filters to improve the performance of lesser processors. There is NO difference!! The term "upsampling" caught on, in part, due to ignorant journalists, and now everybody is using the word to claim some magic improvement. Also, both external oversampling digital filters ("Upsamplers") and internal oversampling digital filters are upstream of the "DAC". A digital processor and the DAC(s) are quite different. A digital processor has 4 main sections: Input receiver (reclocking), oversampling digital filter, DAC (digital-to-analog convertor), and analog output. So, we have once again come full circle: upsampling and oversampling are the SAME THING!! SYNONYMS!! Ask Gmkane for further details. Jordan
pls1
432 posts
 
Merriam-Webster: "brag: engage in self-glorification" There is no point in competeing with a master so I restrain my posts to the simple facts of my direct experience.
khmuse
42 posts
 
There is an article being written on this very subject that should go a long way towards clearing up the confusion. Contributors include many of the individuals mentioned here and the author has assured me that it will be as free of marketing hype as possible. I am uncertain of its intended completion date, but should be within the next month.
carl_eber
1,425 posts
 
Kevin, I'm glad to see your post here............Jordan, I only meant that Kevin's description was semantic!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Get over yourself!!!!!!!!!!!!! George, you can go to hell, and I'll be happy to send you there...name the time and place, old man!!!!!!!!!!!!!!!!!!!!
garfish
1,840 posts
 
Hi Kevin; Can you tell us where the article re: upsampling/oversampling you refer to will be posted or published? Thanks. Craig.
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