FIELD: radio engineering and communication.
SUBSTANCE: invention relates to receiving radio signals. In frequency demodulator (FD) after FM-AFM converter it is recommended to use not diode envelope detector but coherent annular multiplier of AFM and FM signals with LFF at its output. For this purpose, FD at misaligned circuits additionally includes a transformer, two diodes and connection is changed by opening the middle point of circuits and the middle point of RC-chains for connection of secondary transformer winding, connected to IFA.
EFFECT: technical result consists in improvement of noise immunity and speech quality.
1 cl, 3 dwg
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