More and more U.S. stations are going digital using "In Band On Channel" methods where the data is sent with the analog radio station. But a lot of the rest of the world uses a different frequency for the digital version of the station. This talk describes the transmission methods technically, discusses the pros and cons of the different methods as well as the commercial implications, and focuses on how community radio can fit into the changing landscape of radio.
Will the U.S. and its listeners lose out by using different systems than most other countries? A look at this question, why IBOC has been adopted, and how digital radio helps and hinders reception.