Frequency Shift Keying is a modulation technique used in digital signal processing and communication systems. In FSK, the digital information is encoded by varying the frequency of the carrier signal between two distinct frequencies. Typically, one frequency represents a binary “0,” and the other frequency represents a binary “1.”
For example, in binary FSK, if a digital signal is transmitting a stream of 0s and 1s, the carrier frequency might switch between two specific frequencies for each bit. The receiver can then detect these frequency changes to demodulate and decode the original digital signal.
FSK is commonly used in various communication systems, including radio frequency identification (RFID), data modems, and some types of analog modems. It’s a straightforward and efficient way to encode digital information for transmission over analog channels.