DIGITAL FM BROADCAST
EXISTING FM RADIO STATIONS IN THE U.S. ARE USING +/- 75 kHz DEVIATION AT 200 kHz CHANNEL SEPARATION
OTHER COUNTRIES, E.G., IN EUROPE, ARE USING +/- 50 kHz DEVIATION AT 100 kHz CHANNEL SEPARATION
IN-BAND ON CHANNEL (IBOC) DIGITAL OVERLAY EXPERIMENTS
IBOC DIGITAL SIGNAL INSERTED ~25 dB BELOW THE ANALOG FM SIGNAL
OTHER STANDARDS BEING DISCUSSED INTERNATIONALLY WITH THE HOPE OF FINDING A COMMON GLOBAL STANDARD