FM demodulation is a key process in the reception of a frequency modulated signal. Once the signal has been received, filtered and amplified, it is necessary to recover the original modulation from the carrier. It is this process that is called demodulation or detection.
What is it working principle of the IC used in FM demodulation experiments?
The working of a PLL FM demodulator is very easy to understand. The input FM signal and the output of the VCO is applied to the phase detector circuit. … When deviation in carrier frequency occurs ( that means modulation occurs) the VCO frequency follows the input signal in order to keep the loop in lock.
What are the advantages of frequency modulation?
The main advantages of FM over AM are:
- Improved signal to noise ratio (about 25dB) w.r.t. to man made interference.
- Smaller geographical interference between neighboring stations.
- Less radiated power.
- Well defined service areas for given transmitter power.
Which of the following are two methods for generating FM signal?
Which of the following are two methods for generating FM signal? Explanation: Direct method and indirect method are the methods used for generating FM signals. These methods are differentiated by the variation of the carrier frequency.
How do I make an AM signal?
AM generation involves mixing of a carrier and an information signal. In low level modulation, the message signal and carrier signal are modulated at low power levels and then amplified. The advantage of this technique is that a small audio amplifier is sufficient to amplify the message signal.
What is PLL FM?
(Phase-Locked Loop) An electronic circuit that compares an input frequency and phase to a reference signal. … For example, in a superheterodyne FM radio, a PLL is used to lock the local oscillator to an accurate frequency reference such as a crystal or ceramic resonator.