Hi Roland, I have used the method you suggest in the distant past to match sample rates of audio hardware with nominally equal but independent clocks. I found it worked "ok" as long as the resampler you are using can handle small dynamic offsets ie: +/- 0.1Hz without noticeable artifacts. The FIFO used to measure the difference in rate also adds some latency.
On Tue, Apr 7, 2015 at 7:34 AM, Roland Schwarz <roland.schw...@blackspace.at > wrote: > Dear all! > > When I have multiple hw audio (or other) sources and sinks gnuradio is > suffering from the "two clock problem". > > From the docs I have read, one means to mitigate against under- or over- > runs is to have the sender always be a little faster. > > While I understand that this will help keep the sink always filled it > will not avoid buffer under runs, or am I misunderstanding something? > > Also the only way for the source to keep up is to throw away samples at > times. > > Has anyone came up with an idea of how this problem could (should) be > addressed in a proper way in gnu-radio? (I mean without changing hw.) > > From a little test set up I have seen that I could program a sink and a > source, referencing a common buffer. The buffer level (a smoothed > version) could be the driving variable to a dynamically programmed > sample rate converter that is set up so as to keep the buffer level > constant. > > Is this a too hakish attempt to address the problem? > > Has anyone already tried this? > > Is there a more straight forward way, i.e. using a regular input-output > module? > > I am thankful for any hints or comments. > > Roland > > -- > _________________________________________ > _ _ | Roland Schwarz > |_)(_ | > | \__) | mailto:roland.schw...@blackspace.at > ________| http://www.blackspace.at > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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