Gang - I've been playing with the atsc transmitter and have a few notes to report.
First, a good definition of "real time transmitter" would include a firewire video camera, the processing to make an mpeg transport stream (whatever that is, I'm not a video guy), then the atsc_tx out to the usrp and a flea power transmitter, which can be picked up by a nearby common consumer hdtv. Otherwise, since you have to do some processing (and that could be slow, I dunno) to make an mpeg transport stream out of a dvd or whatever anyway, you might as well do the atsc encoding offline as well, ending up with a 200GB file of rf with 2 hours you just dump out to the usrp with no processing at all. Anyway, I've send a short mpeg clip around the loop consisting of a partial 2.x module (atsc.pad, randomizer, rs-encoder, interleaver and trellis encoder) and the rest in 0.9 (field_sync_mux, symbol mapper, weaver mod head, filter, rate converter (munged to use 19.2 instead of 20MSps) and weaver mod tail) ending up with a 19.2MSps file of 'real' short data. From that it should be easy to convert to complex, mix down from 5.75MHz to 0, and decimate by 3 to get something suitable for the usrp and over the air. The 19.2MSps short rf data was then decoded by a part 0.9 and part 2.x receiver to get the original video back. The 2.x field_sync_mux didn't work. --Chuck _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
