In MAA307 “Signal and Systems”, we will consider discrete signals such as digital images and digital sounds. We will first study how sampling allows to go from the continuous world we live in to the discrete world of the computers. We will then talk about linear filters which are used for instance to clean audio recordings or images. We will continue with an introduction random signal  and its application to produce some audio effects. This course will finish with a tour of information theory and coding using the JPEG image standard as an example