What is Frequency Shift Keying (FSK)?

Frequency Shift Keying (FSK) is a way to send messages using changes in sound waves or radio waves, like how a phone uses sound to talk.

Imagine you and your friend are playing a game with a toy telephone. When you want to say "yes," you press the button, and it makes a high tone. When you say "no," you press a different button, and it makes a low tone. Your friend listens to these tones and knows what you're saying based on whether it's high or low.

That’s like how FSK works! Instead of using just one tone (like a phone), it uses two different frequencies, which are like the pitch of sounds, high or low. These frequencies represent the data being sent, such as letters or numbers. When you send a message, you switch between these two tones, and the receiver picks them up and turns them back into your original message.

Think of it like switching a light on and off. A "high" frequency could be on (like a bright light), and a "low" frequency could be off (like a dim or dark light). Each time you switch the light, you’re sending a bit of information.

FSK is used in everything from walkie-talkies to sending messages over the internet, it’s like the invisible language between your phone and the network!