AM stereo
AM stereo refers to any of a number of mutually-incompatible techniques for broadcasting two-channel audio in the medium wave band in a manner that is compatible with receivers designed for standard amplitude modulation. There are two main classes of systems: independent sideband systems, promoted principally by American broadcast engineer Leonard Kahn, and quadrature modulation multiplexing systems (conceptually closer to FM stereo), of which the best known is Motorola C-QUAM.
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