[linux-audio-dev] Merging digital sampling sessions

[David Kastrup]

Tim Orford <tim at pluginz.com> writes:

> On Sun, Dec 11, 2005 at 11:44:32PM +0100, David Kastrup wrote:
>> >> Ok, and here is the rub: playback is not perfect, and neither seems
>> >> to be the sampling.  Probably at times error interpolation sets in,
>> >> probably at times samples get lost or replicated.  Not much, perhaps
>> >> once per minute or so.  This leads to audible clicks, of course.
>
> xruns?

None.

> do you still get the clicks when the card is in loop-back mode?

I think, occasionally.  This can also partly (though not completely)
be a problem of the signal source.  Whatever the source of the
problem, it would be easy enough to rectify it using multiple passes.

>> So there is already something going on which I don't understand.  In
>> "crackle mode", there is basically just noise, but the noise level is
>> correlated with the amplitude of the sound source.
>
> This sounds like you might possibly be a victim of a known bug on
> this hardware. Try changing the "IEC958 In Phase Inverse" switch.

Of course, I tried that.  IIRC it might possibly changes the overall
sound of the noise, but does not change it from being noise.  And once
the card is in working mode, I don't think it makes a difference.

>> So what would one actually have to do to have the "incoming spdif
>> clock" respected?
>
> There is nothing to set on this card. It automatically syncs to the
> incoming spdif when this input is selected.

Ok, thanks.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum