Re: Synchronizing with the actual USB device audio clock
Re: Synchronizing with the actual USB device audio clock
- Subject: Re: Synchronizing with the actual USB device audio clock
- From: Markus Medau <email@hidden>
- Date: Thu, 22 Dec 2005 01:47:42 +0100
> Yes. As I understand it, the neither the USB spec nor the Audio Class
> spec provide for expressing the device's sample clock to the host. I
> think that with adaptive devices, they can provide feedback to the
> host to give the host hints about going faster or slower, but I don't
> recall if this is for host->device communication or just just for
> device->host communication. I'd have to ask the guys working on the
> USB driver to be sure.
Output:
- synchronous: samplerate follows USB clock
- adaptive: hardware follows computer (host)
- asynchronous: feedback pipe (independant samplerate)
Input:
- synchronous: samplerate follows USB clock
- adaptive: feedback pipe (independant samplerate)
- asynchronous: computer (host) follows hardware
Jeff, could you please ask someone to check out our bugreport #4105986
from May, 3rd? This is about probs with asynchronous output making our
USB2 Audio solutions being Windows XP only in class compliant mode.
All needed for reproduction is a digital output at the audio source and an
Apple/Emagic A26. Of course we can also supply hardware to demonstrate it
if needed. Thanks alot.
Best regards
Markus
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