A table of DTFT pairs is usually given as a list of formulas for the signal
\(x[n]\) and its DTFT \(X(e^{j \hat\omega})\). These formulas
can be visualized as plots, and this demo focuses on the ability to recognize
signals and transforms in a graphical form.

The Filter Design Demo is a program that designs simple FIR (and IIR) digital filters,
along with tutorial visualizations of the filter design process.

**Features:**

- FIR Design with many different window types
- Numerous plot options: magnitude/phase response, pole-zero diagram, and impulse response
- IIR Design of Butterworth filters
- Parks-McClellan FIR Design showing the iterations of the Remez Exchange method