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

Gong Zhang zhangnow at gmail.com
Sun Feb 24 21:20:48 EST 2013


Josh Blum 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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>>
>>     
Your answer is quite useful.Can you give any URLs for more detail?And 
even the sample has passed through DDC chain,it's still IF data?
Thanks.




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