Lecture notes available in .pdf format:
SDA15 handout 1 – Introductory Material
SDA15 handout 2 – Fourier Series
SDA15 handout 3 – Fourier Transforms
SDA15 handout 4 – Properties of Fourier Transforms
SDA15 handout 5– Digital Sampling Theory
SDA15 handout 6 – The Discrete Fourier Transform