Re: [Discuss-gnuradio] IIR filters and deemphasis

[Eric Blossom]

On Thu, Feb 28, 2002 at 12:24:08AM -0800, Matthew Ettus wrote:
> The reason deemphasis sounded bad was that it was bad....   I had left
> out the decimation ratio (a factor of 50) in the time constant.  It
> works great now.
> 
> It would be nice to be able to change the frequency of the Complex
> downconverter once things have started.

You can, use 

    GrFreqXlatingFIRfilter::setCenterFreq

> The new IIR filters work now, after several hours of my first experience
> with gdb and ddd (which didn't help, BTW).

FWIW, I find gdb under emacs my tool of choice (but then again I
know how to drive emacs).  gdb from the command line is pretty much of
a bear, since you don't get the context automatically displayed.  
I haven't played much with ddd.  People say nice things about it.

Eric