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Dwight W Decker, Payne Freret, Dirk Hughes Hartogs, Mark B Flowers, Frederick L Mueller: Speech and data multiplexor optimized for use over impaired and bandwidth restricted analog channels. Telebit Corporation, Donald C Feix, July 12, 1988: US04757495 (277 worldwide citation)

The present invention relates to an apparatus and method for the simultaneous transmission of analog speech and modulated data, such apparatus and method being optimized for use over impaired and bandwidth restricted analog channels, or digital representations of such channels. In each instance of u ...


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