From: Ian Campbell <icampbell@arcom.com>
To: Clemens Ladisch <clemens@ladisch.de>
Cc: alsa-devel@lists.sourceforge.net
Subject: Re: correcting incorrect ac'97 codec clock
Date: Mon, 21 Feb 2005 16:05:36 +0000 [thread overview]
Message-ID: <1109001936.3174.7.camel@icampbell-debian> (raw)
In-Reply-To: <Pine.HPX.4.33n.0502211624520.24184-100000@studcom.urz.uni-halle.de>
On Mon, 2005-02-21 at 16:26 +0100, Clemens Ladisch wrote:
> Ian Campbell wrote:
> > I am working on a piece of hardware where the AC'97 codec clock was
> > erroneously set at 24MHz instead of the correct 24.5764MHz, this causes
> > the sound to come out slightly wrong, a 1000Hz sine wave is ~977Hz or
> > so.
> >
> > We'd prefer to have the kernel correct for this error rather than
> > expecting every application to do it.
>
> bus->clock is set to the sample rate of the AC'97 bus, and is 48000 by
> default. Setting it to 46875 after creating the bus should help.
that looks like it'll do the trick -- cheers!
Ian.
--
Ian Campbell, Senior Design Engineer
Web: http://www.arcom.com
Arcom, Clifton Road, Direct: +44 (0)1223 403 465
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prev parent reply other threads:[~2005-02-21 16:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-21 14:38 correcting incorrect ac'97 codec clock Ian Campbell
2005-02-21 15:26 ` Clemens Ladisch
2005-02-21 16:05 ` Ian Campbell [this message]
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