METHOD OF DEMODULATING MINIMUM FREQUENCY-SHIFT KEYING SIGNALS AND APPARATUS FOR REALSING SAID METHOD Russian patent published in 2014 - IPC H03D3/02 

FIELD: radio engineering, communication.

SUBSTANCE: method of demodulating minimum frequency-shift keying signals is characterised by that it includes quadrature signal processing, shifting the signal spectrum from the high frequency region to a video frequency region in two concurrently operating quadrature demodulators, wherein the reference frequencies used in one of said channels are quadrature components of the carrier frequency of unit bits of transmitted information, and in the other - zero bits; summation of output signals of the quadrature demodulators is carried out before differentiation; the obtained signal is differentiated; before averaging, the obtained signal is subjected to two-side clipping and amplification. The apparatus includes two quadrature demodulators, two arctangent calculating units, a differentiator, an adder, a two-side clipper, an amplifier and an averaging circuit.

EFFECT: high noise-immunity and reliability of receiving signals with minimum frequency shift by using intersymbol link properties.

2 cl, 9 dwg