[PlanetCCRMA] Re: [Alsa-user] RME MADI word clock problem

[Bill Unruh]

On Thu, 13 Sep 2007, Roman Katzer wrote:

> Hi all,
>
> I have a Linux system with MADI card (snd-hdspm).  The settings can be
> controlled by using the amixer command-line utility.
>
> Right now there's no MADI hardware connected, but I want to use the
> word clock output to supply a clock signal to sync my hardware.  For
> this, I set the Sample Clock Source of the MADI card to be "Internal
> 48kHz" - so the MADI is clock master and uses its built-in clock.

No, the sample is undoubtedly the highest frequency square wave the system
is able to put out, namely 24KHz. YOur scope time base is probably wrong.

>
> However, the word clock output outputs a 25kHz square wave (tested
> with a digital scope), not 48kHz.  Re-requesting the same sample rate
> and clock source doesn't change anything.  If I do go ahead and
> request something above 96kHz the word clock output goes to roughly
> 51kHz and stays there, even when trying to get a lower sample rate

Yes, it is now a 48KHz square wave.

> again.
>
> Can anyone help?
>
> Best regards, and thanks in advance!
> Roman
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Alsa-user mailing list
> Alsa-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/alsa-user
>

-- 
William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
UBC, Vancouver,BC  |   Program in Cosmology |     unruh@physics.ubc.ca
Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/