Is there a way to control the start time of the stream when it is not coming from a USRP?
On Mon, Jul 16, 2012 at 2:25 PM, Josh Blum <j...@ettus.com> wrote: > > > On 07/16/2012 10:17 AM, Alexander Olihovik wrote: > > Hello all, > > I have general questions on streams: > > > > 1. When precisely does a stream start? When a source is connected to its > > sink? When you call .run() on a top-block? > > > > The UHD Source block has a set_stream_time() which you can call before > starting the flow graph. This will precisely control when samples start > flowing. > > > 2. When adding stream tags to a stream, does the stream itself get > altered? > > No. The tags are basically in an external queue and and tied to the > absolute sample count of the stream. > > > If I were to output the stream to a binary file, would the file look the > > same with and without stream tags? > > > > Yes. There isnt a facility to write the tags yet. But I have heard of a > such a utility in the works. > > > 3. If I have multiple USRPs receiving data at the same frequency and > > sampling rate, all outputting their streams to separate binary files, > will > > sample n on binary file 0 be taken at the same time as sample n on binary > > files 1, 2 ... up to the number of USRPs, assuming all USRPs have been > > synchronized with the same clock and PPS signal? > > > > > > Yes, 1) If you have multiple source blocks and set the stream time to be > the same. Or, 2) you have a multi channel source block, this will just > work as all channels are automatically aligned > > > -josh > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- *Alex Olihovik University of Virginia 2013 BS Electrical Engineering BS Computer Engineering ano...@virginia.edu*
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