[wdmaudiodev] Re: USB Audio Class 2.0

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Fri, 14 Feb 2014 09:43:14 -0800

Børge Strand-Bergesen wrote:
> I'm sorry Tim, but this is like saying Canon & Co. should have stopped
> adding megapixels once their cameras got 4 or so of them.

No, this is not a valid comparison.  Our eyes can tell the difference
between 300dpi and 600dpi, and a 4MP camera can only do about 200dpi
when printed at 8.5x11.  Those extra pixels ARE being put to use.

The same is simply not true of audio.  You don't "zoom in" on an audio
track.  The concept doesn't make sense.  The best human ears are
physically unable to sense frequencies above about 20kHz.  Per Nyquist,
anything above twice that frequency serves no purpose at all.  They
CANNOT, physically, alter what we sense in the sound.

It reminds me of the "Dominator DMX 10" scene from Ruthless People:
(Caution: language)

> kHz is a simple number. Comparing the kHz of your audio system will be
> done in the consumer crowds just like they compared the MHz of their
> CPUs and the megapixels of their cameras. The more you have of that
> simple metric, the better they will feel.

That's voodoo, not engineering.  Those MHz and megapixels are being
used.  Those extra kHz are utterly pointless.  Unlike the other two, we
have reached a physical limit.

Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.


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