Lamar Owen wrote: > On Wednesday 26 April 2006 14:03, Matt Ettus wrote: >> Matteo Campanella wrote: >>> hello, In the case of atv, as I believe the passband of the signal is >>> way too large for the throughput of usrp usb, are there any special >>> techniques/tricks to achieve some sort of result? >> I believe that most ATV is AM (almost 12 MHz) instead of VSB (6 MHz). >> If that is true, then you could do an AM demodulation in the FPGA pretty >> easily. You would tune the picture carrier to the center of the >> passband. Of course, the TVRX filters are only 6 MHz wide, so you'd >> lost the high frequency content of the signal, and probably the sound >> carrier. > > If it's true DSB AM, then just tune to one side, filtering out one sideband, > and treat it as single sideband. Would want to watch out for aliasing, of > course, from the rejected sideband. Unless you're real good, and set it so > that the aliased sideband folds into the passband perfectly... :-) the > sidebands are, after all, identical in AM.
If you do what I suggested you don't have to tune exactly because you can do an AM detection. Matt _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
