Daniel Garcia wrote: > I am working on an NTSC receiver using the USRP/TVRX board. I am tunning the > board to 63.25 MHz with decimation set to 10; this gives me 6.4 MHz of > bandwidth. The NTSC channel is 6 MHz wide so with these settings I get some > interference from the adjacent channels. > > Is there a way to set the filter taps used by the USRP so that I could make a > filter to remove the frequency infomation at the extreme right and left of > the sampled data? I can use an FIR filter in the PYTHON runtime but it uses > lots of CPU power. > > Yes, you can change the filter taps in the FPGA. See the halfband (HB) verilog code. > I read on a previous thread that it is possible to invert the spectrum of the > sampled signal so that the tuned frequency would be the FM carrier. The end > result being a stream from the USRP where 0 Hz is the center frequency of the > audio carrier the the video carrier is at 4.5 MHz. Is this possible? The > advantage here is that the baseband audio does not need to be shifted before > fm demodulation; also the video carrier does not need to be shifted before > demodulation (AM). >
Not sure what you're looking for here. Matt _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio