Fsk - modulation methods based on a single reference frequency

摘要

The process of the fsk modulation is intended to generate an output signal (ss) formed of alternating signals to a first frequency and of signals to a second frequency. It consists in converting a reference signal (s0) having a constant frequency of a series of n secondary signals (s1, s2, s3, s4) of the successive same frequency as the reference signal (s0), two successive secondary signals are phase-shifted by a value of 360 / n degrees, to construct the output signal (ss) to the first frequency of switching cyclically to the third frequency of the secondary signals in a direction of the series of secondary signals and to construct the output signal to the second frequency of switching cyclically to the third frequency of the secondary signals in the opposite direction of the series of secondary signals.