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Re: [Discuss-gnuradio] Loops in graphs? Do we need them?

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Loops in graphs? Do we need them?
Date: Tue, 8 Feb 2005 15:03:29 -0800
User-agent: Mutt/1.5.6i

On Tue, Feb 08, 2005 at 10:27:40PM +0100, Thomas Traber wrote:
> Hi Achilleas,
> > The reason (imho) of the existence of PLLs (and similar non-linear 
> > feedback loops) is that in old analog systems, such an option was not 
> > there (ie, taking the arctan of a signal).
> Maybe you are right and I am thinking to much in hardware.
> It might be that almost all digital signal processing task
> can be done without feedback.
> Loops which cover only few blocks are better hard coded in
> C. 
> BTW: There are files like GrAGC.h, GrCostasLoop.h and
> GrComplexVCOMixer.h in src/lib/general. I do not know how
> they are used.

They are from the 0.x code base and need to be ported.
They're still in CVS as a reminder to either fix them or kill them.


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