**Frequency domain**

**08/09/17**

*“How can we visualize the frequency of functions?”*

Sinusoidal functions have a measurable **frequency**. However, it can be hard to distinguish them when multiple of them with **different** frequencies are added together. So wouldn’t it be logical if we could make some way to visualize all of the different frequencies together? Well, let’s think about this. First, let’s **isolate** each sinusoidal wave from one another. Then, let’s take its frequency and **plot** it on an axis. Then, let’s take the amplitude of each sinusoid, and place it on another axis. We can then connect these, and make a graph from it. This construction is known as the **frequency domain **and is frequently used in control theory and electronics to pick out all of the different sinusoids present