This tutorial explains how to build filter banks which split the audio band into N sub-bands. If no processing is applied to the sub-bands, the original signal may be reconstructed (apart from a phase factor) by adding all sub-bands.
If you want a filter bank only for analysis without reconstruction, you don’t need this tutorial.
Version 1.0: Original post on FS forum at http://www.dsprobotics.com/support/viewtopic.php?f=2&t=2822#p15319
Version 1.1: Added option to display magnitude or phase. Added references.
Added to the new Tutorial category -Exo