FM stereo demodulating device

DETAILED DESCRIPTION The present invention relates to an FM stereo demodulating circuit which employs a double balanced multiplier together with means for automatically switching the operational mode of the multiplier between monaural and stereo in such a manner that the clicking noise which may occur when switching from the monaural mode to the stereo mode, or vice versa, is prevented.
An object of the present invention is therefore to provide an improved FM stereo demodulating circuit which exhibits no disadvantageous clicking noise inherent in conventional circuits.
This object is achieved by controlling the subcarrier signal to be applied to the double balanced multiplier in response to the level of the pilot signal contained in the composite signal, to thereby separate the output channels of the multiplier after the latter is switched from the monaural to the stereo mode only after the pilot signal has reached a predetermined magnitude.