Lamar Owen wrote: > Yeah, been tracking CVS on a machine here, and noticed a load of differences. > > One quick question: now that tweak_adc_offset is no longer in the repository, > is the ADC DC offset automatic? I still see a DC spike in the FFT output.
> In the large FFT case, I notice that the resulting trace is significantly > thicker, and it doesn't seem to average out. I'll have to look, but an > 'fft_smoothing' argument (to thin the trace) would be what I'd need to get > the resolution I need. What you are seeing is that ALL points end up being plotted. If you assume you have a horizontal screen resolution of 1024 point, but are plotting a 128 K-point FFT, you end up with 128 points being plotted in every X position. Each of those points is likely to be slightly different in amplitude, so you see a thick line. Some sort of "video averaging", to borrow a term from spectrum analyzers, would be necessary to clean that up. Matt _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
