Dual 16 Bands Spectral Editor

The FUMANA is an all analog dual filter bank with various control to access dynamically these bands. Each filter bank is composed of an array of 16 independent 48dB/oct bandpass filters. Having two identical filter arrays, allows you to use one of those for spectral analysis (of a modulator signal) and the other for spectral re-synthesis (of the main signal). Each array is sub-grouped in odd and even bands (numbering these increasingly from 1 to 16 from left to right). It is possible to apply different signal to odd and even bands, both for main and/or modulator arrays. This, together with the 16 envelope followers connected to each band of the modulator filterbank, and the 16 VCA connected to each band of the main filterbank, allows the FUMANA to perform a single 16 bands or a dual 8 bands analog spectral transfer.

While the upper section provide access to each main filter’s direct output, the lower section has 4 voltage controllable parameters to manage two independent functions for further spectral editing: tilt and scan.

The tilt, as the name suggest, tilts the spectrum, adding and subtracting amplitude to the 16 bands, emphasizing lower or high bands, and attenuating high or lower bands: this is managed only with the green potentiometer.

The scan, instead, works with three parameters: peak/notch, band selector and width. Like in a parametric equalizer, where is possible to set peak/notch gain, frequency and slope, the FUMANA uses three parameters to set which is the center band to perform this manipulation, then if that band should be emphasized or attenuated, and how this action is extended to nearby bands.

In addition to the 16 bandpass outputs, there are other 4 outputs provided: the all bands output, the all envelope followers output, the odd bands and the even bands output. These two have the options to be inverted in phase with two switches, in order to obtain even more combination when summed together, maybe/also with the “all bands output”, using, for example the 333 module.

Since a spectral transfer tool may be used as a “vocoder-like-effect”, the FUMANA provides an input for an external noise which may be used for unvoiced (fricative/sibilants) sounds as words containing or starting with s, f, z, ch and other fricative sounds ([s] [z] [ʃ] [tʃ] [dʒ] [ts] [ʂ] [f] [v] [ɸ] [θ] [ʒ] etc etc).

fumana / ˈfuma:na / s.f. [dialect of Modena, from fūmus, ‘smoke’] – ‘fog’. Like spectres use to lie into the thick fog (which the Modenese countrisyde is pretty rich of), so many spectral capabilities and functions do within the thick bands of the ‘fumana’.

more than 2.500 components

Modifications/notes:
- NORM/MORE switch for the faders disappears: in the end, having it would've complicate its use too much, and without big advantages...
- unvoiced section: we modified it and made it dual. What this means? Simply that since a rough dual independent 8 band vocoding can be achieved, we also made the unvoiced to respond independently for the odd and even bands. One noise input and level -> 2x filters -> to 1x 2162 dual VCA (managed by two separated envelope followers
- I know a few guys asked me during this year about components, filters technical details. I anticipate I'm not the analog designer, my engineer is the guy, so I won't go too much in deep:
---- filters: the official version is confirms the 16 bandpass at 48db/Oct
---- summing: NE5532 as in all our modules...
---- VCAs: 1st prototype was based on both 2 stages of an LM13700, same used on SAPEL... The production will use THAT2162, friend of the THAT2181 we are using on the CGM, cause they simply sound great

http://frap.tools/fumana/

  • ? mA +12V
  • ? mA -12V
  • ? mA 5V
  • 38 mm deep
  • Ø 5.00 (1 Votes) Average Rating

This Module is a prototype or in a concept phase.

$999 submitted Apr 22nd, 17:45 by analogdarkside | last Change Dec 5th, 22:05 by simonefabbri

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