Re: synchronization of input and output
Re: synchronization of input and output
- Subject: Re: synchronization of input and output
- From: Brian Willoughby <email@hidden>
- Date: Fri, 30 Oct 2009 17:30:53 -0700
On Oct 30, 2009, at 17:25, Taylor Holliday wrote:
It's hard to say. There isn't enough context here. You say
everything is "10
samples or so late", but late as compared to what?. And, is it 10
samples
all the time? If not, what precisely is the variance?
You need to define better what you are measuring and how you are
doing it
before I can provide more information.
I'll try. In order to determine whether newly recorded audio is
properly synchronized with previously recorded audio, I hooked the
output of my duet into its input. Then recorded audio to a separate
track. The newly recorded audio is 10 samples late relative to the
audio being played back. The 10 samples seems to be a constant.
CoreAudio, and therefore Logic, only has the latency reported by the
audio driver to go on. If the Apogee Duet provides I/O latency
values which are off by 10 samples in total, then your test will be
off by 10 samples.
Have you tested against other devices? What about the built-in audio
on your Mac?
Brian Willoughby
Sound Consulting
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