FM demodulating circuit having an insensitive frequency point

An FM demodulating circuit for demodulating a plurality of frequency modulated signals, said FM demodulating circuit comprising:

• input means for receiving at least first and second frequency modulated signals, said first and second frequency modulated signals being independent from each other;
• a first demodulator circuit coupled to said input means for demodulating first predetermined signals from said input means, said first predetermined signals including said first frequency modulated signal and said second frequency modulated signal with said second frequency modulated signal appearing as a first crosstalk component in said first frequency modulated signal, said first frequency modulated signal being demodulated in said first demodulator circuit;
• and
• output terminal means coupled to an output of said first demodulator circuit for producing a demodulated output of said first demodulator circuit;
• said first demodulator circuit comprising first circuit meand coupled to said input means, first capacitor means coupled to said circuit means, and first inductor means coupled to said circuit means and said capacitor means, said first capacitor means and said first inductor means including a parallel-connected circuit comprising a capacitor and a coil,
• said first demodulator circuit having a first demodulating output frequency characteristic in which a first differential value describing the slope of the first demodulating output frequency characteristic curve reaches a maximum at a frequency which is approximately equal to a center frequency of said first frequency modulated signal and reaches a minimum at a frequency which is approximately equal to a center frequency of said second frequency modulated signal, so that the amplitude of the demodulated output of said first crosstalk component is negligible as compared to the amplitude of the demodulated output of said first frequency modulated signal.