Fixed filterbank

The Fixed Filter Bank has 8 bandpasses, plus a High-Pass and Low-Pass Filter. As the level of the individual filter frequencies can be controlled dynamically, you can generate completely unusual sounds.

Many real instruments, due to the construction of their resonance body – don’t have a consistent volume level or sound color across their whole playable range. The body usually emphasizes one or more frequency ranges of the generated overtone structure and suppresses others. This is what gives instruments their particular sound, which changes depending in what range the instrument is being played. The emphasized sections of the spectrum are being called formants. Using the Filterbank you can create such formants.

A very special ”natural” instrument is the human voice, as it’s "body" can be adjusted in size and shape. With the help of this capability, it is possible to form the various vowels (a,e,i,o,u) with your throat using the resonance of the vocal chords. Due due its dynamic control the Filterbank of the Spectralis has the ability to vary the emphasis of the different frequency ranges. In principle the signal routed through the filterbank becomes the ”vocal chord” and the filterbank itself is the resonance "body".