In Band On Channel a method of transmitting both digital and analog carriers and information on the same frequency for FM broadcasting

In Band On Channel Method used in the USA for the digital transmission of radio signals for mobile reception

The digital audio broadcasting standard adopted for the United States. Its name stems from the kind of signal being broadcast. IBOC signals use the same AM and FM bandwidth as a station's analog signal ("in band"). The digital information is contained within the station's signal, ("on channel").