On Mon, Nov 9, 2009 at 11:20 AM, ILKYOUNG KWOUN <hl1...@gmail.com> wrote: > Hello folks, > > I need to analyze the filter characteristics of two halfband filters in > USRP2. Since I have littel experience on Verilog HDL, I cannot pinpoint what > exact coefficients the two halftband filters are adopting(I am reviewing > 'gnuradio/usrp2/fpga/sdr_lib/hb_dec.v' and > 'gnuradio/usrp2/fpga/sdr_lib/small_hb_dec.v' for hb1 and hb2.). > > Would somebody help me with finding out the seven and thirty one coefficents > of filters directly?
>From the comments in the header and the frequency response, these seem to be the coefficients: h = [ -107 0 445 0 -1271 0 2959 0 -6107 0 11953 0 -24706 0 82359 131072 82359 0 -24706 0 11953 0 -6107 0 2959 0 -1271 0 445 0 -107 ] ; h_small = [ -10690 0 75809 131072 75809 0 -10690 ] ; Does that make sense to you? Inner and outer coefficients? The comments at the top of the file? Brian _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
