RF APPARATUS

摘要

The present invention relates to a high-frequency apparatus incorporating a FM demodulator, and is objected to improve its threshold effectively always. For achieving this object, the apparatus of this invention is comprised of a FM demodulator means (113), a detector (114) detecting the degree of FM demodulation of the output from the FM demodulator (113), an input signal intensity detector (103) and a composite circuit (110) which combines an output supplied from the detector (114) through a switch (109) with the output of the input signal intensity detector (103) and produces a control signal of a gain control circuit (102). The apparatus of this invention provides optimum FM demodulation bandwidth according to FM modulation degree of input signal and can realize constantly improvement of threshold without producing unusual noise due to out of synchronization. <IMAGE>