TECHNIQUE FOR SYNTHESIZING THE MODULATION OF A TIME VARYING WAVEFORM WITH A DATA SIGNAL

摘要

TECHNIQUE FOR SYNTHESIZING THE MODULATION OF A TIME VARYING WAVEFORM WITH A DATA SIGNAL A technique for digitally synthesizing the amplitude modulation of one or more carrier signals with a random digital data signal is disclosed. Pursuant to the present invention, a memory unit is addressed by a plurality of binary coded digital symbols in the data signal. For each address, at least two digital representations are read out. Each representation corresponds to a different sample of the carrier signals which has been amplitude modulated by a composite of the spectrally shaped data signal. The disclosed technique can be adapted to synthesize a variety of modulation formats, and can provide compensation for fixed in-rail and cross-rail distortions.