Re: Maintaining sound card at a specific frequency

[Mark Knecht <markknecht@gmail.com>]

On Tue, 18 Jan 2005 17:48:30 +0100, Takashi Iwai <tiwai@suse.de> wrote:
> At Tue, 18 Jan 2005 16:50:36 +0100 (CET),
> Giuliano Pochini wrote:
> >
> >
> > On 17-Jan-2005 Patrick Shirkey wrote:
> >
> > >> I guess I'm wondering if there isn't some .asoundrc magic that could
> > >> be done in my Linux account on this machine that would tell all
> > >> applications (other than Jack for now) to use some virtual device that
> > >> handles all frequencies. If that virtual device was the default and
> > >> the resampling (for Mozilla/games/whatever) was done in software and
> > >> the sound cards frequency was never changed then I think things would
> > >> work much better.
> > >>
> > >
> > > I think you can use default as the device name in .asoundrc and it
> > > will be used as the default device for all apps.
> >
> > IMHO we should think on a good solution for this problem. Some
> > cards have many channels/voices but the sample rate is common
> > for all of them. Currently the only clean way to manage it is
> > a control that locks the sample rate at a given frequency, but
> > it isn't a nice solution because it requires explicit user
> > intervention. In the echoaudio driver I implemented a kludge
> > that automatically locks the sample frequency in order to avoid
> > unwanted rate changes.
> 
> You can add a control to lock the sample rate (e.g. ICE1712).
> 
> 
> Takashi
> 

That could be a good solution if it would also set the initial
frequency of the card.

Right now I have to manually set the HDSP 9652's frequency to 44.1K
every time I boot to get the ADAT network to the right frequency.
While other may like 48K for audio work those of us that work alot
with samplers are far more bound by the frequency that the samples
were recorded. This, in the case of GigaSampler and LinuxSampler, is
always 44.1K and the HDSP 9652 always comes up at 48K.

To be clear, I think this problem will effect more people in the
future and the solution should be general in format and enforced by
the Alsa management team for all cards. The default can be unlocked if
you like, and that probably works better for the stand alone
workstation.

- Mark


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