Digital Drive

RE: you are 100% right

75.213.133.56

Todd Krieger

In Reply to: RE: you are 100% right posted by Vince S on November 21, 2008 at 15:43:40

"but you are obviously an audiophile
which is not the case of many.
this 44.Khz -> 48Khz business
is just terrible."
It's not so much the "audiophile" part of me that raised the flag, but the "engineering" part of me..... I otherwise wouldn't have realized how awful this was. I might have cited the sonic ills in an individual player or DAC, but wouldn't have had any idea what may have been causing it.
On the PC Audio board, at least everybody there agrees that Microsoft's "kmixer" is something that should be disabled, overridden, or bypassed, because the playback is no longer "bit perfect." But a lot of people there don't realize this is ASRC described in another way. The only difference between kmixer and 24/96 upsampling is the output sample rate is half (24/48). And nothing else.

Edits: 11/21/08

Follow Ups:

i suppose - Vince S 00:47:34 11/22/08 (3)
that the "manufacturers" use the avalaible
chips on the market which are now 24/96.
With asrc you make it work cheaply and
90% of people won't make any difference.
That is "mass market" engineering.
I am always amazed to see the price
tags on "top" gears that use asrc.
- You Hit On a Bigger Problem...... - Todd Krieger 09:14:48 11/22/08 (2)
  We've been held hostage by these mass-produced DSP chips, that are also used in cheesy consumer audio products...... Until a true high-end solution is designed from the ground-up (aside from Brasfield's expensive Platinum III offerings and Wadia's vintage "Decoding Computers"), digital audio technology will indefinitely remain in the Dark Ages......
  - RE: You Hit On a Bigger Problem...... - Tony Lauck 08:34:14 11/23/08 (1)
    There are hi-end DACs that use proprietary DSP and proprietary converters. They just aren't cheap, because they can't leverage on high volume components. These would include, I believe, some DCS and DAD products. Someone who has these products might provide model numbers.
    
    The most critical DSP processing involves the filtering required to deal with the 44.1 sample rate. If you feed the DAC bit perfect 44.1/16 then you will need good DSP in the DAC. If you use a separate box and upsample to a higher multiple you can get by with much less critical DSP in the DAC, and good DSP software is available pretty much for free if you have a computer based transport. However, you will have to deal with all the other problems/opportunities of computer audio, e.g. noise and jitter problems.
    
    Tony Lauck
    
    "Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
    - RE: You Hit On a Bigger Problem...... - Todd Krieger 00:54:51 11/25/08 (0)
      Well let me put it this way..... If there comes forth a "ground-up" D/A design that isn't hideously expensive and has bulletproof calculations/algorithms (no ASRC), low RFI, and customizable filtering, I'd kiss the designer's feet........
      
      If MSB Tech would develop a less-expensive "4x oversampling" version of its Platinum III technology at a budget price, I think it could be dynamite..... (I think they haven't done so because it might undermine their expensive stuff.)

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