Hi
I've not followed earlier writing on this thread, so may well be out of
turn here, but one option for synchronising clocks across multiple
boards is to distribute low-ish stable reference and then
phase-locked-loop multiply that up at each place where you want a an
oscillator.
It's more complicated that just distributing a clock, but has advantages
that high-ish frequencies aren't sent over distance and that clocks on
different boards can be different multiple of the reference.
Gordon.
On 20/01/2020 00:29, José Luis Artuch wrote:
Hi Frederik,
I'm no expert, but I would avoid any of the ALSA solutions. If you
are sending one stream to multiple audio cards, the crystals are
going to be slightly different (e.g. 48.033 kHz vs 48 kHz), so you
need a system which is able to resample to keep these in sync. ALSA
doesn't have that ability AFAIK. ALSA can "resample" 48 kHz to 44.1
kHz, but it can't do adaptive resampling to correct for crystal
differences. Whether MPD can fix this, I don't know.
I think it would be most convenient to build a single oscillator for
all audio boards.
Regards.
José Luis
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