The main presentations are 1.DSP 2015, and give appropriate hyperlinks to DFT link x.pptx (x=1,2,3,4 or 5) :)
2. FFT
3. DCT,DHT and WT.
Do check for typos. Some of these were prepared when I was sleepy. Revert back at vt@mec.ac.in if yo find any typos or disagree with what has been presented.