An Introduction to AM Stereo
AM stereo is any of a number of mutually-incompatible techniques for broadcasting two-channel audio in the mediumwave band
in a manner that is compatible with receivers designed for standard amplitude modulation. There are two main classes of systems:
independent sideband (ISB) systems, promoted principally by American broadcast engineer Leonard Kahn; and quadrature amplitude
modulation (QAM) multiplexing systems (conceptually closer to FM stereo), of which the best known is Motorola's C-QUAM.
A famous European transmitter using AM stereo is Villebon sur Yvette on 864 kHz, which transmits
Radio Bleue.
Source: wikipedia.org
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