This Module is a prototype or in a concept phase.
FIXED FILTER BANK
The SW907A Fixed Filter Bank is a non-voltage controlled modifier, which emphasizes or reduces the gain of the center frequency bands indicated on each of the eight center potentiometers, in addition to the cutoff points set by low pass and high pass filters at either frequency extreme. A total of 10 overlapping LC networks are included.
This Module is based on the original design from 1968
The Fixed Filter Bank is often referred to as formant filter because it can be set to emphasize or attenuate midrange frequencies, which fall within a particular band, no matter how the frequencies of the signal are moved. Like many acoustic instruments, a characteristic set of formants, are always a part of the resultant output (given a particular complex waveform). Emphasized bands of this sort are particularly evident with double reed instruments. Thus, this filter is part of the patch for these simulations.
SW907A FIXED FILTER BANK - Diagramm
In addition, completely different timbres can be set up for different ranges of the same tone, if the output of the filter is recombined with unfiltered frequencies at different levels.
work in progress