Re: [ecasound] capture from two delta 1010LTs at once

From: Bery Rinaldo <ecasound@email-addr-hidden>
Date: Wed Nov 16 2005 - 23:08:49 EET

Paul Winkler said:
> On Wed, Nov 16, 2005 at 11:26:27AM -0800, Sean Edwards wrote:
>> This is just a theory, but are the two sound cards
>> synchronized to the same oscillating timing crystal?
>> When using multiple sound cards, the crystals that
>> provide the timing for the oscillator on each card are
>> within an acceptable range, but not exact. This is
>> why RME provides "add-on" cards to their Hammerfall
>> product line; each add-on cards uses the crystal and
>> oscillator on the main card that connects to the PCI
>> bus.
>> There is some documentation regarding a hardware hack
>> for using multiple sound cards. The idea of the hack
>> is simple: remove/disable/bypass the crystal on all
>> sound cards but one, then use some sort of jumper
>> connection from each card to use the crystal on one
>> card. Put the term "synchronizing sound cards" into
>> your favorite search engine to find out more about
>> this.
>> As I said before, this is just a theory.
> What he said. But I'd first check if the 1010LT has
> a word-clock input / output anywhere, and if so,
> use that - that's what it's for.
> Failing that, if it has optical I/O (I know the 1010
> has S/PDIF but I don't know about the LT), you can
> connect the optical out of one card to the optical in
> of the other, and set the second card to use
> S/PDIF input for its clock by using envy24control.

I was planning to use the word-clock output from card 1 to feed the
word-clock input on card 2. The 1010LT does have S/PDIF in and out but
I'm not sure if I need that.

As for my initial question, I think I've figured it out...I should have
been using "alsaplugin" instead of "alsa" when using the multi (all16)
configuration I made. This command worked:

ecasound -t:5 -a:1 -f:16,16,44100 -i:alsaplugin,all16 -a:1 -o:all16.wav

Now on to learn more about "synchronizing sound cards" through personal
experience ;-)


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Received on Thu Nov 17 00:15:06 2005

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