You are not logged in. Please login or register.
RME User Forum → FireWire & USB series → FireFace 800 sampling frequency deviation
Hi,
Can you please help us with the following issue.
When we play with the interface for a couple of hours, it seemes it gets some delay in the sound (less samples than we expected are being played). Do you have an idea why it happens? Is it related to clock accuracy of the interface? If so, can you supply any specifications regard sampling rate deviation/drift (ppm)?
Thanks,
Idan
Please provide more details.
Regards,
Daniel Fuchs
RME
> it gets some delay in the sound (less samples than we expected are being played).
I don't see the relation between such a strange effect and changes of the sample rate. The sr can be whatever, somnething that has to be played will be played (although in wrong speed then).
OK, I'll try to be more clear.
I'm playing a long audio file, sampled at 48KHz. The file contains exactly 20 hours of music. HOWEVER, when played, it takes a little bit more time (a couple of seconds).
I guess that a reason for this could be that the interface clock isn't accurate enough, so there is a small deviation in the sample rate (1 or 2 Hz, for example).
Is it possible?
Thanks,
Idan
On 20 hours 1 sec deviation is 0.00139%, That could be within spec. Not sure
1hz deviation of 48k is 0.002%, so it is less then 1 hz.
Ofcourse you need to be 10000% sure the file is exactly 2 hours to the sample and that the clock you use to check is also 100% accurate and started and stopped 100% accurate.
But interesting......
Thanks Vinark.
Where can I see the the maximum deviation value of your interfaces? I can't find it in your spec.
There is no such spec. The quartzes used usually lie within 50 ppm of their nominal frequency.
OK, that's good enough.
Thanks !
RME User Forum → FireWire & USB series → FireFace 800 sampling frequency deviation
Powered by PunBB, supported by Informer Technologies, Inc.