Preface to the Special Volume on the SAT 2005 Competitions and Evaluations

Successive bits of serial data modulate successive alternate cycles of an alternating current reference signal. The modulated reference signal is separated into its modulated and its unmodulated cycles, or components, which are then full wave rectified. One of the components is then phase-shifted in time and inverted so that the cycles of the modulated and the unmodulated components occur simultaneously. Both the modulated and the unmodulated components are then integrated and averaged to obtain a signal which is representative of the original serial signal.