
Independent sideband (ISB) is an AM single sideband mode which is used with some AM radio transmissions. Normally each sideband carries identical information, but ISB modulates two different input signals — one on the upper sideband, the other on the lower sideband. This is used in some kinds of AM stereo (sometimes known as the Kahn system), bu...
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http://en.wikipedia.org/wiki/Independent_sideband

pertaining to a transmission or emission in which the lower sideband and the upper sideband resulting from amplitude modulation correspond to independent modulating signals
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-06-27
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