AUDIO FFT FILTER BANKS
Julius O. Smith · 2009
FFT-based nonuniform filter banks are proposed based on channel-sized inverse FFTs applied to nonuniform frequency-partitions (or overlap-add decompositions) of the Short Time Fourier Transform (STFT). Audio filter banks (particularly octave filter banks) are considered as application examples. Trade-offs discussed include perfect reconstruction, aliasing cancellation, flexibility of filter-channel band edges, use of the FFT for speed, multirate time-domain channel signals, time-varying filtering, and associated is-sues. 1.