Re: [Discuss-gnuradio] Decimation

[Eric Blossom]

On Sat, Nov 20, 2004 at 11:21:53AM +0000, Prateek Dayal wrote:
> On Fri, 19 Nov 2004 15:07:54 -0700, Dan Gisselquist
> <address@hidden> wrote:
> > 
> > IMHO, decimation always requires an antialiasing low-pass filter
> > coupled with the actual decimator.  Two primary implementations exist.
> > The first filters and then decimates, the second couples the two
> > operations together so that the only filter outputs computed are the
> > valid outputs of the decimator.  The differences between these two
> > approaches, in terms of computational cost, can be very dramatic.
> 
> Which approach does GNU Radio take ???

The fast one (number 2).

Eric