This is an excellent write up of the first software based HD Radio receiver. It is licensed GPLv3 and on Github at https://github.com/theori-io/nrsc5 https://gi

This is an excellent write up of the first software based HD Radio receiver. It is licensed GPLv3 and on Github at https://github.com/theori-io/nrsc5 https://github.com/theori-io/nrsc5