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CAM-D
From Wikipedia, the free encyclopedia
Compatible Amplitude Modulation - Digital or CAM-D is a proposed hybrid digital radio format for AM broadcasting, put forth by respected broadcast engineer Leonard Kahn.
While little is known about it, it is an in-band on-channel technology that uses the sidebands of any AM radio station. Analog information is still used up to a bandpass of about 7.5kHz, with standard amplitude modulation. The missing treble information that AM normally lacks is then transmitted digitally beyond this. Audio mixing in the receiver then blends them back together.
Unlike other IBOC technologies like Digital Radio Mondiale and iBiquity's HD Radio, Kahn's apparently does not provide a direct path to all-digital transmissions, nor any multichannel capability. The advantage however is that it takes up far less of the sidebands, thereby causing far less interference to adjacent channels, hence the "Compatible" in the name. That problem has plagued HD Radio on AM, along with the fact that it (like CAM-D) is proprietary. HD Radio also requires expensive new transmitters, while CAM-D does not.