Hi Martin -
On Apr 29, 2010, at 9:23 AM, Martin Braun wrote:
y(n) = x(n) + x(n-2)
My question is: can GNU Radio be modified to accept this? It's a
perfectly valid flow graph (similar to ones you find in DSP
textbooks),
and thanks to the history of the delays, one that should work. I'd be
very interested to hear some comments on this.
Shortest Answer: Yes, this could be done -- GNU Radio is open
source :). Go for it! I think you'll find that it's not trivial to
implement. Further: If you look at the radio of computation time
versus overhead time (one version of "computational intensity") of any
such loops -- when implemented in a data-flow block fashion such as
what GNU Radio does (and, all SDRs that I know of) -- it will be very
low compared with writing a specific block that internally handles the
feedback. So, low efficiency but allowing for feedback, or high
efficiency but no feedback ... hmm ... seems obvious which to choose
at least for the initial implementation. Maybe some future
implementation will deal with feedback loops in some special way.
Hope this helps! - MLD
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