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

Josh Blum josh at ettus.com
Sun Feb 24 21:04:59 EST 2013


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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