17 Apr
2012
17 Apr
'12
7:09 p.m.
On Mon, Apr 16, 2012 at 05:21:47PM -0400, S. Massy wrote:
Okay, so for a standard 2 periods of 128 frames each,
my nominal dddelay
is 256 frames or 5.3ms at a sr of 48k, twice that for a round-trip.
No. The nominal roundtrip-delay (physical input to physical output
if you connect the corresponding ports directly) is period * nperiods.
1 * period occurs at the input, (nperiods - 1) * period at the output.
If you masure it using jack_delay you will in most cases find a value
that is a bit higher, this is due to delay in AD/DA converters etc. For
some types of soundcard (e.g. USB) the real latency can be significantly
higher than the nominal value. You can tell Jack about this using the
-I and -O options.
The extra delay when making a loop such as Ardour -> jconvolver -> Ardour
is one period.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)