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In Reply to: Frank, there's some smart stuff in DSD posted by Eric LeRouge on April 28, 2003 at 14:28:19:
That's common knowledge. Oversampling for 44.1 at 256 times was done 10..15 years ago in 1 bit dacs with noise shaping.The stupid part of dsd is that it cannot handle 48k and it's multiples.
And these are becoming the standard bitrates for the future.
Follow Ups:
Frank, I'm not discussing the 1 bit aspect, nor the noise shaping (I'm not qualified), just the "translation" path.Correct me if I'm wrong:
Couldn't the DSD conversion tables work both ways ? (in theory at least) So if this is correct it should be able to handle 48k, and 96k "naturally", only through integer multiples. If I understood the information posted on the HRH:
48 x 294 =14112000 / 5 = 2822400
2822400 / 64 = 44.1Whether this can be implemented in practice, I have no idea. I just wanted to say that this is also a conversion path between the two PCM families, and probably better than going through interpolation.
If you maintain a 24 or 32 bit depth, and if you have to store any information at those crazy rates during the intermediate steps of your manipulations, however, you probably need a server and a rack of 120Gb hard discs..
With the advent of peer-to-peer and grid computing, this kind of processing is just around the corner.
Just musing...
Best
Eric
I think it is safe to say that Pioneer found that conversion of DSD to 88.2/32 PCM and leaving the signal in PCM was more transparent and more convenient than Sony's 1 bit method. This is clearly a lossy conversion, as is any conversion of DSD to PCM other than 1 bit. But, if you do a 1 bit conversion you run into the headroom issue. Conversions from PCM to DSD, on the other hand, should be lossless provided that they are feasible.
as you know I don't trust Pioneer all that much with their implementation of standards :)
But it makes sense, because DSD is apparently compatible with all variants of the PCM 44.1 family.Best
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