do you have any idea on how to do this ?

 

While I do not use Processing:

Processing is a programming language, development environment, and online community. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology. Initially created to serve as a software sketchbook and to teach computer programming fundamentals within a visual context, Processing evolved into a development tool for professionals. Today, there are tens of thousands of students, artists, designers, researchers, and hobbyists who use Processing for learning, prototyping, and production.

Based on what I have seen of it your question is too vague and open ended to really answer. You can't just say "signal Processing" without defining the signal to be processed.

Ron