METHOD AND APPARATUS FOR CONVERTING BINARY INFORMATION INTO A HIGH DENSITY SINGLE-SIDE BAND SIGNAL

摘要

D21,849 METHOD AND APPARATUS FOR CONVERTING BINARY INFORMATION INTO A HIGH DENSITY SINGLE-SIDEBAND SIGNAL by A. Lender and H. H. Olszanski An incoming bit stream is digitally processed to obtain both in-phase and quadrature-phase 7-level correlative signals. The two 7-level correlative signals are separately band limited to a passband having a bandwidth that is about 1/8th of the bit rate of the original bit stream, and these band limited signals are then separately analog modulated, respectively, using in-phase and quadrature-phase components derived from a line carrier oscillator. The modulation products are then combined in a summing circuit to derive a single-sideband 7-level correlative signal.