Re: [Discuss-gnuradio] How to synchronize feedback between blocks?

[Martin Braun]

On Thu, Apr 29, 2010 at 12:00:33PM +0200, Martin Braun wrote:
> However, I think there's no direct way to feed back data between blocks.
> You need to create a feed-forward structure, i.e. have a synchronisation
> block near the beginning that outputs the frequency offset to your
> frequency correction.

This has been bugging me for a while now, and since I sent that email, I
just can't get it out of my head (sorry, Nick, for hijacking this
thread).

Imagine the following setup:
http://img338.imageshack.us/img338/6418/diffequation.png
(for those who don't want to follow the link: I connect a noise source
to two connected delays such that they form the difference equation

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.

Cheers
MB

-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
Research Associate

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KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

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