FIELD: physics.
SUBSTANCE: in demodulation mode, the spectra of amplitude-modulate signals are decomposed using a nonlinear element; their amplitude modulation coefficient is corrected; a low-pass filter is used to select the low-frequency information signal whose amplitude varies according the high-frequency signal amplitude variation law; a four-terminal circuit is made from not less than three reactive impedors. In modulation mode, the amplitude of the high-frequency signal is varied according to the control signal amplitude variation law; the resistance values of the two-terminal circuits are selected based on the condition for simultaneously ensuring given ratios of moduli of transfer constants the high-frequency part of the modulation and demodulation device in two states of the nonlinear element, determined by two amplitude values of the control signal at the given number of frequencies. In demodulation mode, the control signal used is the envelope of the input amplitude-modulated signal; two-terminal circuits are made from a number of reactive components not less than the number of given frequencies; values of the parameters of the elements are determined based on the condition of realising the selected resistance values of the two-terminal circuits at the given number of frequencies.
EFFECT: improved method.
