Clock Recovery with FSK Demodulation in GNU radio

1. What is FSK demodulation?
2. What is the most commonly used demodulation technique for FSK?
3. How to demodulate FSK signal in Matlab?

What is FSK demodulation?

An FSK demodulator is provided comprising means for receiving and digitizing an FSK signal (such as a signal comprising two frequencies f1 and f2 in which first and second logic states are represented by first and second periods of different durations).

What is the most commonly used demodulation technique for FSK?

The most used demodulation technique is the one using a PLL circuit (fig. 2). The FSK signal across the PLL input takes two frequency values. The error voltage supplied by the phase comparator follows such variations, and so, it constitutes the NRZ binary representation (high and low level) of the FSK input signal.

How to demodulate FSK signal in Matlab?

y = fskdemodulator( x ) demodulates the input signal by using the FSK method. The output is the modulated FSK baseband signal.