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An Interview with KARRENBERG

1. "Interactive Multimedia Introduction to Signal Processing" takes a radical approach to presenting the traditional topics. Please describe the successes you have had with teaching students within this innovative interactive environment.

Answer: For many years I was a "teachers teacher" for hundreds of peoples, who studied microelectronics and signal processing at university and who later wanted to work as teacher in this field. Most of them had a lot of problems explaining the content and basics with their own words on an undergrade level without calculus. If you don´t believe, try to explain the sense of Laplace transform, convolution, Z-Transform and so on without mathematics.

I was looking worldwide for a convincing concept, supporting far, but I didn´t find it. So I myself attempted to implement a concept which satisfied to my targets of modern didactics.

During the 11 years old development time of this interactive multimedia document my pupils and young teachers helped me to explain the contents in a maximally simple way. Their ideas an questions were evaluated and implemented. Everything they did not understand derictly, was clarified without mathematics by examples, analogies and pictures.

2. What do you respond to instructors who are disappointed by the absence of mathematical formulas in your book?

Answer: There are a few hundred books, where signal processing is based on mathematical modelling. Why writing another one? But there is worldwide only this book, giving an interactive multimedia introduction to theory and practice of signal processing, based mainly on three fundamental physical facts: FOURIER-,Uncertainty- and Symmetry-Principle.

Remember: Nothing works in the technique, what contradicts to the laws of nature. So there must also be a clear way to explain signal processing based on physics. A lot of people believe, modern signal processing is based mainly on Claude Shannons mathematical (!?) theory of communication. For my opinion this theory has a physical background too, but still his theory has not been integrated into modern physics for a better understanding of the central principles of nature.

3. Buyers of your book gain access to a very powerful software (DASYLab  S-version) at a remarkably good price. How can you afford to be so generous?

Answer: Here is the story: For many years measX, a subsidiary of National Instruments, sent more than 8000 Demo-CDs at prospective custumers. I needed two years in order to convince measX of a new marketing concept: A student version of DASYLab, linked with an electronic document. The idea behind was learning by doing. Self investigating learning and research in concrete projects are now possible!

4. Your textbook has already appeared in several editions in the German language. Can you cite an example where teacher or student feedback has helped to your further refine the CD-book package?

Answer: The whole „learning system“ for signal processing was created from 1993 to now. Thousands of pupils and hundred of young teachers helped me to find my didactic way. I myself understood many contents better and deeper due to the questions of many pupils and teachers. Many of their systems designs with DASYLab were better than my own. An Interviewwith

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