Demodulation of FSK signal

1. What is demodulation of FSK?
2. What is the most commonly used demodulation technique for FSK?
3. What is frequency shift keying demodulation?

What is demodulation of FSK?

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.

What is frequency shift keying demodulation?

Frequency-shift keying (FSK) is a method of transmitting digital signals using discrete signals. The two binary states -- logic 0 (low) and 1 (high) in a binary frequency-shift key mechanism -- are each represented by an analog waveform.