[USRP-users] When is the time recorded in rx stream metadata

Alex Zhang cingular.alex at gmail.com
Sun Feb 24 21:23:01 EST 2013


If so, that is great that timestamp is added in hardware, which resolves my
confusion for a long time.


On Sun, Feb 24, 2013 at 8:04 PM, Josh Blum <josh at ettus.com> wrote:

> The timestamps are added in the FPGA after the samples exit the DDC
> chain. Every packet is a timestamped VITA IF data packet, where the
> timestamp is an absolute clock tick count. The UHD software converts
> this tick count into a time_spec_t (a time in seconds) for the metadata
> field. In gnuradio, the time is also passed downstream via the stream
> tagging API
>
> -josh
>
> On 02/22/2013 11:03 PM, Gong Zhang wrote:
> > Hi,
> > When is the time recorded in rx stream metadata?Is it when the sample
> > going through AD in USRP?
> > Thanks.
> >
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>
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-- 

Alex,
*Dreams can come true – just believe.*
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