How would you produce a square wave on a digital system? At first sight, this seems completely trivial. You might think that you could just alternate a series of +1 values with a series of −1 values and be done with it. Well, it doesn’t work like that. An ideal square wave needs infinite bandwith, so creating one is…
The impulse response of a system is, perhaps not entirely unexpectedly, the response of a system to an impulse. This article introduces this all important concept, and shows how knowing only the impulse response of an LTI system can be used to…
The title of this article is Discrete-Time Signal Processing, although the term digital signal processing (with the abbreviation DSP) is much more common. Both types of signals are discrete in the time dimension, in the sense that they are sequences of numbers. The difference is that a digital signal is…
![Promenadikeskus concert hall [image: Helsinki University of Technology]](https://tomroelandts.com/sites/tomroelandts.com/files/styles/thumbnail/public/field/image/promenadikeskus-concert-hall.jpg "Promenadikeskus concert hall [image: Helsinki University of Technology]")
I’d like to kick off a series of articles on signal processing with the answer to a very practical question: How to find out how a lion sounds in a concert hall. I’ll deal with more theoretical subjects in later articles. Smuggling an actual lion unseen into a concert hall seems unlikely to succeed, and might…