Question about xlating filter and resample filter

GNU Radio
1

Hi all, I use xlating filter get baseband data from a wide band signal,
but
the xlating result sample
rate is not what I want, so I need to use resample to convert the signal
to
the sample rate what I
want. I find gr_rational_resampler_base_ccc also need a filter(tap). I
already filter the baseband signal
so how should I set the resampler filter(tap)?

Thanks!

2

On Sat, Jan 29, 2011 at 10:23 PM, James Jordan
[email protected] wrote:

Hi all, I use xlating filter get baseband data from a wide band signal, but
the xlating result sample
rate is not what I want, so I need to use resample to convert the signal to
the sample rate what I
want. I find gr_rational_resampler_base_ccc also need a filter(tap). I
already filter the baseband signal
so how should I set the resampler filter(tap)?

Thanks!

The easiest thing to do is use blks2.rational_resampler_ccc(I, D).
This is a wrapper around gr.rational_resampler_base_ccc, but if you
don’t pass it the taps and just the interpolation and decimation
values, it will design a filter for you that is the width of the
passband.

If you are using the git code (master or next), you can also use
blks2.pfb_arb_resampler(rate) where the rate is the real number
resampling rate you want. It, too, will automatically generate the
filter for you if you don’t specify one.

Tom

3

Thanks Tom.