Re: Why do G5 optical inputs have more latency than analog?
Re: Why do G5 optical inputs have more latency than analog?
- Subject: Re: Why do G5 optical inputs have more latency than analog?
- From: Dennis Gunn <email@hidden>
- Date: Mon, 29 Nov 2004 18:55:29 +0900
On Nov 29, 2004, at 5:56 PM, Brian Willoughby wrote:
[ I am assuming that this is an apple core audio driver issue but I am
[ wondering why the monitoring latency using the analog inputs of the
G5
[ with logic is 346 samples while if I use separate convertors such as
[ those of an RME multiface the latency ends up being around 400
samples?
It may not be a driver issue, unless you find that the same RME
Multiface,
with the same PCI card, has lower latency on another computer.
The hardware in the RME Multiface has a lot to do with the latency.
The A/D
may have any number of sample delays, depending upon whether there is
any
oversampling and digital filtering. The I/O interface will also
introduce some
latency, depending upon how the data transfer is implemented. The I/O
interface delay may be different between PCI and CardBus options from
RME. And
finally, the RME driver for CoreAudio may introduce latency.
Have you changed the buffer size on the RME Multiface? I've never
used one,
but the screenshots on the web indicate that there are many options
for buffer
size, and each choice yields a different latency.
The RME is a known quantity it accounts for a total of 62 samples
total. Logic is a known quantity it accounts for 192 samples total.
That leaves 156 samples unaccounted for.
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