I've read Smith's "Scientist's and Engineer's Guide to DSP" and Lyons'
"Understanding DSP," from reading these two books I have a grasp of the
DFT. Now, I want to learn about the STFT.
Can you recommend a book/website/article that presents a good, easily
understandable explanation of the STFT? Preferably one that explains many
of the concepts that it uses, instead of simply invoking them?