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: Sat, 31 Oct 2009 10:25:22 -0700
Interesting, upon rebooting the duet was in sync. Putting the computer
to sleep and waking it back up results in it being out of sync again.
Unplugging the duet and plugging it back in restores the
synchronization. The builtin audio was always out of sync.
Something's buggy!
- Taylor
On Fri, Oct 30, 2009 at 6:14 PM, Taylor Holliday <email@hidden> wrote:
> 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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