railway RRB JE (CBT I + CBT II) Mock Test 2024 Communication Systems Angle Modulation Frequency Modulation
A frequency modulated signal can be demodulated by -
1
passing through an integrator followed by envelop detection.
2
multiplying with carrier frequency followed by low pass filtering.
3
passing through a differentiator followed by envelop detection.
4
passing through a Voltage Controller Oscillator (VCO).