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In Reply to: DSD didn't exist 15 years ago, could you be thinking of 1 Bit CD players? posted by Teresa on March 28, 2006 at 10:45:14:
"DSD upsampling" of 44.1/16 is going to get you the same result, for the most part (noise shaping may indeed be slightly different) as decoding 44.1/16 with a 64fS 1-bit delta-sigma DAC.DSD just adds the "direct" part of this. In other words, everything stays at 64fS/1bit. No quantization to 44.1/16 occurs.
In the end what you get is a delta/sigma PDM stream at 64x44100. You can certainly argue whether or not DSD provides for improved fidelity by skipping these quantization steps (I believe it does) - but the ball game, is, in fact, rather similar.
Note of course that conservation theories apply: you cannot 'add back' data that was lost in a quantization step. And arguably by skipping it, less data is lost in the first place.
That doesn't make it any less 2.8mhz 1-bit delta-sigma though.
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Follow Ups
- Actually, Teresa, it is pretty much the same ball game. - Michi 11:15:10 03/28/06 (0)
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