Re: synchronization of input and output
Re: synchronization of input and output
- Subject: Re: synchronization of input and output
- From: Taylor Holliday <email@hidden>
- Date: Fri, 30 Oct 2009 18:14:18 -0700
On Fri, Oct 30, 2009 at 5:30 PM, Brian Willoughby <email@hidden> wrote:
>
>> 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
>
I just did the same test with builtin audio, the recorded audio is
also out of sync and this time
its about 40 samples too early:
http://wtholliday.org/recording_delay_builtin.jpg
I don't have access to any other devices right now.
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