Howtosignalprocessing
What is complex demodulation?
Complex demodulation is the digital equivalent of heterodyne detection, in which the input signal is multiplied by a carrier oscillation exp(−iωmt) of modulation frequency ωm and then low-pass filtered. The time-dependent amplitude and relative phase can then be computed from the filtered demodulate.
How do you demodulate FM signal?
A simple and effective FM demodulation technique involves a high-pass filter (for FM-to-AM conversion) followed by an AM demodulator. A high-pass-filter-based FM demodulator is preceded by a limiter to prevent amplitude variations from contributing error to the demodulated signal.
