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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.
Eric