The Perfect Camera

Airy pattern

The perfect camera is diffraction limited. This article is written strictly from an optical point of view, so don’t expect a Nikon / Canon / Leica comparison here… Optically, a camera (or telescope or other optical instrument) can be described by its point spread function (PSF), which… read more

Submitted on 21 July 2013

Impulse Response

Unit sample function

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… read more

Submitted on 6 July 2013

Discrete-Time Signal Processing

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… read more

Submitted on 23 June 2013

Going Responsive

Responsive design is a way to make websites work both on desktops, tablets, and smartphones, without having to create a separate site for each of them. Something had to happen with my site to make it more mobile-friendly, and I’ve decided to “go responsive” with this site for several reasons: The percentage of mobile visitors is increasing steadily, so… read more

Tags:

Submitted on 9 June 2013

Exponential Growth

Linear vs. exponential

The term “exponential growth” strongly implies quick growth. However, something that grows exponentially will seem to grow quite slowly at first. In practice, there is a good chance that you won’t notice it at all until it suddenly “pops into view”. Take the adoption of… read more

Submitted on 26 May 2013

How to Record a Lion in a Concert Hall

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… read more

Submitted on 12 May 2013

Pages

Subscribe to TomRoelandts.com RSS