What is the principle of FM demodulation?
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.
How do you demodulate an FM radio?
A simple and effective FM demodulation technique involves a high-pass filter (for FM-to-AM conversion) followed by an AM demodulator. A high-pass-filter-based FM demodulator is preceded by a limiter to prevent amplitude variations from contributing error to the demodulated signal.
Why limiting is necessary in FM demodulation?
In FM radio This stage provides a constant level of signal to the FM demodulator stage, reducing the effect of input signal level changes to the output. If two or more signals are received at the same time, a high-performance limiter stage can greatly reduce the effect of the weaker signals on the output.
What is the use of amplitude limiter?
Amplitude limiter is a device used to keep the amplitude of the signal in the FM receiver at a constant value.
What is the role of limiter in FM?
The amplitude limiters that can be found in FM receivers work to remove amplitude variations. In FM signals, the frequency of the carrier is generally varied. Therefore, any variations that exist in the amplitude of the received wave can be attributed to noise or interference in the channel of communication.
What is an FM limiter?
Limiter circuit is used in FM receiver to remove the noise present in the peaks of the received signal and to remove any amplitude variation in the received signal; the output of the limiter has constant amplitude.
What is limiter circuit?
A limiter circuit can be understood as the one which limits the output voltage from exceeding a pre-determined value. This is more or less a clipper circuit which does not allow the specified value of the signal to exceed. Actually clipping can be termed as an extreme extent of limiting.