PNP

PNP is a highly useful software for anyone who is seeking to learn more about signal processing. This program is completely free and open source, making it accessible to a wide variety of users who may be interested in trying it out. Additionally, PNP is specifically designed to be used for tutorial purposes, making it a great tool for anyone who is new to this area of study.

One of the main things that PNP allows you to do is to set, move, and remove poles and zeros of a one-dimensional digital filter. This feature can be incredibly useful when it comes to manipulating signals, and can help users to better understand how digital filters work in general.

Finally, PNP is also capable of displaying a range of different effects of the filter in the frequency domain. This can help users to better visualize how their changes to the filter are affecting the overall signal, and can lead to a deeper understanding of how digital filters work. Overall, PNP is an excellent choice for anyone who is looking for a powerful and accessible tool to help them learn more about signal processing.