Based on the plot of resulting figures the firdes designed filter has more out of band rejection. It's a trade-off between number of taps and rejection. We're good enough (computationally) at doing fir filters that 20 extra taps 25dB of attenuation is worth it.
-Nathan On Wed, Jul 22, 2015 at 4:57 AM, Daniele Nicolodi <dani...@grinta.net> wrote: > On 21/07/15 21:39, Tom Rondeau wrote: > > Here's my presentation from last GRCon: > > > > http://gnuradio.squarespace.com/grcon14-presentations#tut-rondeau > > Hello Tom, > > browsing through your presentation I see that on page 58 and 59 you > recommend to use firdes filter design tool and not optfir to build re > reconstruction filter. However, I don't quite understand why the filter > generated by one tool is better than the other is this case. > > Can you please comment on it? > > Thanks! Cheers, > Daniele > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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