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Date: Thu, 21 Mar 2013 04:25:02 +0400
From: Lev Serebryakov <lev@FreeBSD.org>
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To: Yamagi Burmeister <lists@yamagi.org>
Subject: Re: snd_envy24{,ht} recording support?
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Hello, Yamagi.
You wrote 20 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2013 =D0=B3., 11:52:07:

YB> On Tue, 19 Mar 2013 15:19:59 +0100
YB> David Demelier <demelier.david@gmail.com> wrote:

YB> just listen to music, there's the possibility to send a digital signal
YB> by spdif to an external a/d-converter, etc... The need for high end add
   Unfortunately,  here  is NOT MoBo with proper S/PDIF support. ALL of
  them uses Realtek chips which doesn't support proper 44.1Khz
  sampling rate, has "hardcoded" DSP settinga and is equipped only
  with 48Khz (or 96/192) crystal, so try to output CD sound via S/PDIF
  on any modern MoBo will lead to re-sampling, processinh and/or bad
  synthesized carrier frequency (which is fatal for S/PDIF).
   Naturally, unpacked WAV file, sent via on-board S/PDIF optical link to
  professional card arrives as completely different beast.
   You need good USB DAC (with "asynchronous" mode, which is rare, and
  I don't know, is it supported by FreeBSD USB stack at all) or some
  additional two-crystal card to connect good DAC to computer via coax
  or optical S/PDIF.
    And, ironically enough, cheapest way to do so is to buy some
  Chinese PCI or PCIe card, based on envy24[ht], which could be bought
  for $15-$20. It will be equipped with very bad DAC and analog path
  will be crap, but it will have "true", transparent, bit-correct
  S/PDIF.


--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>