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  »  New  Credibility of digital information..  Much ado about upsampling ......  Didital Things  Forum     5  34103  05-25-2008
  »  New  Reel-to-Reel Tape vs. Raw Better Digital..  So, the "format" and sub-generational stages/...  Didital Things  Forum     13  132337  11-16-2007
  »  New  DA architecture: True Multibit vs. anything else...  If it might…....  Didital Things  Forum     17  120603  12-09-2007
08-23-2010 Post mapped to one branch of Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,536
Joined on 05-28-2004

Post #: 1
Post ID: 14294
Reply to: 14294
A CD playing audio person must have 2 DACs
fiogf49gjkf0d
People argue out there if a DAC need to do upsampling.  I usually do not like the upsampling DAC and always prefer, or even insist to play in whatever format the source is.  Some DACs do not ask you and upsample the incoming stream to 2x  and higher if you ask it or not. Some of them let to defeat upsampling and some just make you to feel that you defeat something but in reality just inject a different type of dither.

What however everyone misses in the upsampling view is the fact that the upsampling result is very much differs from CD to CD. With some CDs the upsampling does not ruing sound and is absolutely not distinguishable with direct processing. And of course there are some CDs that sound juts horribly after upsampling. I do not know what on CDs made them to be upsampleable or not but as a practitioner I do feel a need to have 2 DACs of my main DAC is upsampling-type with not true defeatable upsampling. (most of the DACs nowadays). I do would like to learn what make CDs not upsampleable…
The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
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manisandher
London
Posts 156
Joined on 09-05-2008

Post #: 2
Post ID: 14306
Reply to: 14294
Upsampling vs. oversampling
fiogf49gjkf0d
I'm no expert, but my understanding is this. 99.9% of DACs are going to oversample the digital input anyway. Does it therefore matter if the input is upsampled or not? Unless there is a super-duper interpolation algorithm that can create more information from that which is encoded in the 1fs file, I don't see how upsampling can ever improve the sound, over and above what oversampling will do anyway. I've tried many upsampling schemes, and like you Romy, I've reverted back to playing all files at their native rates. Upsampling seems to kill the sound, though interestingly, oversampling doesn't (at least on the PM Model Two). Of course, this is very much dependent on the quality of the filters used.

FWIW, my feeling is that oversampling is absolutely necessary for rates below 4fs - I don't agree with NOS DACs for 1fs. At 4fs and above, I don't think oversampling is necessary and that NOS may work well here, though of course all delta-sigma DACs need to oversample at 128x or 256x in order to work anyway.

Mani.
Page 1 of 1 (2 items) Select Pages: 
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Credibility of digital information..  Much ado about upsampling ......  Didital Things  Forum     5  34103  05-25-2008
  »  New  Reel-to-Reel Tape vs. Raw Better Digital..  So, the "format" and sub-generational stages/...  Didital Things  Forum     13  132337  11-16-2007
  »  New  DA architecture: True Multibit vs. anything else...  If it might…....  Didital Things  Forum     17  120603  12-09-2007
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