Adaptive FM (Frequency Modulation) and FSK (Frequency Shift Keying) blind demodulation method, system, equipment and terminal

The invention belongs to the technical field of signal modulation, and discloses a self-adaptive FM (Frequency Modulation) and FSK (Frequency Shift Keying) blind demodulation method, system, equipment and terminal, FFT (Fast Fourier Transform) processing is performed on an input signal, the spectrum characteristic of the signal is observed, whether the signal has the characteristic of a comb spectrum is judged, and a center frequency and a peak interval are calculated according to a spectrum obtained by FFT, a spectrum peak interval and a sampling rate; differential processing is carried out on the signals by adopting a differential demodulation principle; carrying out FFT (Fast Fourier Transform) processing on the signals subjected to differential processing, comparing the frequency spectrums of the two signals, and distinguishing the two signals through frequency spectrum characteristics; according to an FFT result, analyzing a single-frequency component in a frequency spectrum through a software algorithm