How does frequency shift keying (FSK) operate?

Frequency Shift Keying (FSK) operates by varying the frequency of the carrier signal to represent digital data. In this modulation technique, two different frequencies are used to represent binary values: typically, one frequency corresponds to a binary '1' and another to a binary '0'. When the data changes from one binary state to the other, the frequency of the carrier signal shifts accordingly. This method allows for reliable transmission of digital data over communication channels, as it is less susceptible to noise and interference compared to amplitude-based modulation techniques.

The essence of FSK lies in its ability to encode information through frequency changes, making it a fundamental technique used in various digital communication systems.