Pulse-density modulation

Pulse-density modulation (PDM) is a way to send information by turning electrical signals on and off very quickly. To understand PDM, think of an old-fashioned light switch in your house. When you turn it off, it stops the flow of electricity, and the light goes dark. When you turn it on, electricity flows and the light turns on. PDM works the same way, but much, much faster. Instead of just turning the signal on and off, it sends many tiny, quick on-and-off signals over a very short period of time, at a very high rate. By using these quick on-and-off signals, PDM can send information like images, sound, or other data much more quickly and efficiently than a regular on-and-off switch.