Here is a gnuradio module and some flowgraphs for transmitting NRSC-5 (HD Radio). https://github.com/argilo/gr-nrsc5 https://github.com/argilo/gr-nrsc5 A lot

Here is a gnuradio module and some flowgraphs for transmitting NRSC-5 (HD Radio). https://github.com/argilo/gr-nrsc5 https://github.com/argilo/gr-nrsc5 A lot of the ibiquity patents are expiring this year or have already expired as well. I haven't been following the patent situation on this as closely as I used to, but needless to say I will be very excited when they all finally expire. Digital radio would have been awesome had it become pervasive in the late 90's when it should have.