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From: Stefan Ehmann <shoesoft@gmx.net>
To: Alexander Leidinger <Alexander@leidinger.net>
Date: Tue, 30 Jan 2007 12:17:46 +0100
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Cc: freebsd-multimedia@freebsd.org
Subject: Re: envy24 sound quality problem
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On Sunday 28 January 2007 14:45, Alexander Leidinger wrote:
> Quoting "Konstantin Dimitrov" <kosio.dimitrov@gmail.com> (Sat, 27 Jan 2007 
17:28:51 +0200):
> > "spicds_setdvc(ptr->info, 0);" turns on the AK452X De-emphasis filter
> > for 44.1KHz, which is very very wrong, so "spicds_setdvc(ptr->info,
> > AK452X_DVC_DEMOFF);" is completely right and without active AK452X
> > De-emphasis filter the high-frequencies will be present and the
> > problem is fixed.
> >
> > thank you, Stefan, well done!
> >
> > i also made the necessary change to the current code here:
> > http://envy24.svobodno.com/driver/envy24/current/
>
> Anything to commit?

Should definitely be committed (if Konstantin agrees). He also changed this in 
envy24ht.c which basically uses the same code.

With this fix, spectrum analysis of the snd_envy24 output looks (practically) 
identical to the output of the win/opensound driver.

Stefan