Re: [Discuss-gnuradio] Decimation scheme

[Brian Padalino]

On Wed, Jul 16, 2008 at 2:46 PM, Sebastiaan Heunis <address@hidden> wrote:
> Hi
>
> Can anyone please help me with some information on the CIC filters in
> the USRP?  I need to know how many CIC stages there are, what the
> cutoff frequency and out of band rejection is and how the decimation
> is performed after filtering.  Which .v files should I have a look at?

The decimating CIC filter implementation can be found here:

    
http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/cic_decim.v

It's a 4-stage CIC filter.  Decimation is somewhat inherent within the
process, so I don't understand that question.  Sorry.

Good luck.

Brian