On Thu, Oct 31, 2013 at 3:46 AM, Harry Zhang <zhang...@gmail.com> wrote: > Hi, > As far as I know rx_time tag is associated with the first sample of a > receive stream. If I wanna get multiple rx_time tags while receiving > continuous data, should I stop and issue a new stream again and again > for getting more rx_time tags. > Thank you.
Harry, We want to minimize tags through the flowgraph since it adds overhead. The UHD driver only sends an rx_time tag whenever one is necessary. That means that if there is a chance that the host has become unsynchronized, it sends an updated tag. So there's one at the beginning of the stream to set the initial time. Then, if a dropped packet or overflow are detected, it sends a new rx_time tag. Between time tags, you can count samples and you know the sample rate, so you know the time of every sample based on that initial rx_time tag (to within the tolerance of the sample clock on the USRP). Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
