RE: [Discuss-gnuradio] Re: synchronizing sound cards in a cluster

[Joseph DiVerdi]

At 1:03 PM -0800 3/13/03, Matthew Kaufman wrote:
>This isn't really the hard part. The hard part is getting multiple sound
>cards to share the same sample clock. IF the same clocks all ran at the
>same rate, then you could fairly easily use known inputs to synchronize
>up the results, but the sample clocks aren't nearly close enough
>together for that. In fact, the sample clocks in most sound cards are
>*terrible*.
>
>Even synchronizing multiple sound cards inside the same PC is a
>difficult problem for this reason.
>
>So, for starters, go get some sound cards that have an external clock
>input for the sampling. (If you can find such a thing)
>
>Matthew

I believe Matthew is exactly correct regarding the crux of the problem and if 
someone were to discover a sound card with an external clock would appreciate 
learning about it.

In this situation it may be necessary to migrate to an analog input ADC card 
which very often has an external clock or trigger input.

Best regards,
Joseph
-- 
Joseph A. DiVerdi, Ph.D., M.B.A.          
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