[vdr] Re: 5.1 Sound with analog soundcard?

[Markus Schorer <ms@plain.de>]

hi,

sure it's possible.
use a52dec and let it decode to 5.1 (or some other fixed setups).
i'm doing the same. it works really good.

small problems remain:
- there is no way to switch between stereo and 5.1 like switching
  languages (this is how i think it should be done).
- there is no (at least built-in) method of adding a delay to the
  sound, 5.1 + stereo gives a "echo" (5.1 is early).

regards,

Guido Fiala wrote:
> 
> On Tuesday, 1. July 2003 17:19, anaxares@gmx.de wrote:
> > Hello,
> >
> > as nobody seems to be able to help me, I assume everyone has either
> > - a digital amplifier that can handle the spdif-out from the soundcard
> > or
> > - is satisfied with the stereo-sound from the DVB-S card.
> >
> > I however have a "cheap" dolby 5.1 box set with analog 6-channel input
> > and an onboard 6ch-out soundcard.
> > Isn´t there any possibility to convert the AC3-sound to analog-6ch by
> > software? And no, I don´t want to connect together X soundcards to convert.
> 
> I'am stuck with the same setup - did'nt want to buy a set of
> plastic-boxes+5.1amplifier if i already have nice amplifiers and boxes.
> thought one should be able to feed them nicely with the soundcard.
> 
> There are 2 separate special problems:
> 1.Only Pro7 send 5.1 streams, so you can beside that only play dvd's with ac3
> 
> 2.theoretically "dolby-digital" or call it simply "dolby" has encoded the
> rear-channels (and even the lfe+center) into the 2 stereo-signals. Most
> tv-stations transmit that sound all the time and "good" tv-sets can make
> "virtual-surround" out of it, meaning that all 5+1 speakers can be feed with
> 2 stereo-channels, it's not perfect, but quite nice to have.
> 
> Why should'nt a sound-card not be capable of the same?
> Is there none that can do this for patent-reasons or what?
> I asked that question more than 3 years ago in the alsa-ml and there seems
> still to be no solution...
> 
> In case i do the step and buy a AC3-decoder+amplifier - does someone know it
> it can do the above? With digital-in-signals and/or with analog signals?
> Some recommendations/prices?
> 
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