[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Predictable latency?

From: Thomas Schmid
Subject: Re: [Discuss-gnuradio] Predictable latency?
Date: Tue, 19 Aug 2008 08:21:12 -0700

This is correct. Your samples go through buffers, and therefore it is
hard to predict the latency each and every sample will have to get
from software to the USRP. I did a study on this a while back. If you
are interested, you can find the paper here:

What you can do though is calculate the minimum and the maximum
latency that the samples will have. Also, I am not sure how far the
mblock and GNU Radio is in regards to timestamping outgoing samples (I
didn't follow the GNU Radio development lately) is, but if you can
tell the USRP when to send out which sample, then you could easily
predict the latency itself.


On Tue, Aug 19, 2008 at 8:14 AM, Chris Stankevitz <address@hidden> wrote:
> Geib, Jeffrey (Civilian) wrote:
>> I have an application where I don't necessarily care what the latency
>> is, but I need it to be predictable and/or constant.  Is there a way to
>> achieve this with the USRP hardware?
> USRP supplies data via USB.  I believe the delay of USB data through the
> operating system and into your application is not predictable or constant.
> Chris
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

"Don't complain; Just work harder" - Randy Pausch

Thomas Schmid, Ph.D. Candidate
Networked & Embedded Systems Laboratory (NESL)
University of California, Los Angeles (UCLA)

http://gresci.blogspot.com/ - Science articles on green technology

reply via email to

[Prev in Thread] Current Thread [Next in Thread]