Pulse-position modulation

Okay kiddo! So, you know how when we want to send a message or talk to someone far away, we use phones or computers? The messages are sent through a bunch of tiny electrical signals, called pulses, that travel through wires or airwaves. Pulse-Position Modulation, or PPM, is a way to do this really quickly and accurately.

Imagine you have a flashlight that blinks really fast, like a strobe light. If you can control when the flash happens, you can make a binary code, which means you can turn the blinking on or off to represent ones and zeroes. In PPM, instead of blinking on and off, we're changing the time between each pulse. We can send a message by having different time intervals between the pulses, like "long," "medium," and "short" gaps. This is like saying "yes," "maybe," or "no."

Now, let's say we want to send a message that says "HI!" We can use different combinations of long, medium, and short gaps between pulses to spell it out. For example, H might be medium-short, and I might be short-medium. So if we send those pulses in that order, the person on the other end can understand that we're sending the message "HI!"

So, that's PPM! It's a way to send messages really fast and accurately using different time gaps between pulses. It's kind of like Morse code with flashes of light instead of dots and dashes.