Review of STFT Filterbanks

Let's take a look at some of the STFT processors we've seen before, now viewed as a polyphase filter bank.

Since they are all based on the FFT, they are all efficient, but most are oversampled as ``filter banks'' go. Some oversampling is usually preferred outside of a compression context.

The STFT also computes a uniform filter bank, but it can be used as the basis for a variety of non-uniform filter banks giving frequency resolution closer to that of hearing.