Multyband/Crossover Help please!

[Wishx]

Hi community! I'm trying to make a simple cross over like splitter so I can insert modules to each frequency band separately, can anyone help me !?

[martinvicanek]

Here is a Linkwitz Riley crossover setup, 2 to 5 bands, 12 to 120 dB/octave steepness.
http://synthmaker.co.uk/forum/viewtopic ... 105#p91215

[Wishx]

thank you so much! it seems I cant see that click because it prompts me to log in *synthmaker. Could you post a schematic !? or some way to read the thread !? thank you again, you had been so helpfull

[Wishx]

Solved still I'm a bit confuzed, because what I need to do is for example use a distortion module for only the 1 K to 2 K hrz , then another type of distortion for another band and so on . What can I do to practicly achive this !?

[martinvicanek]

Here is a quick demo of a 3 band distortion effect to get you started. You can choose the two crossover frequencies and apply various types of distortion (the usual tanh, arctan, hard clip and some others) to each of the three bands individually.

[Wishx]

Thank you so much ! You made my day !!

[Wishx]

Actualy this is exactly what I needed ! If you could help me and make it split the signal into 7 bands, I'll be so greatfull ...

[Wishx]

Actualy if someone could have the time to make this multy channel both work in mono and stereo with a 7band split I'd be greatfull for all time !

Currently I tried to work it out and make it work both mono and stereo but seems when I drag the vst to a mono channel it stops giving output :/

[martinvicanek]

So you were actually serious about the 7 bands? Unfortunately the scheme I posted on the SM forum (above link) does not scale well - the number of components grows exponentially with the number of bands. However, I found a reference here that describes how to build an N-band filterbank from 2-band crossovers and allpasses arranged in a tree structure. The trick is to place the allpasses as close to the root of the tree as possible so they act on entire branches instead of leafs. This way the number of components can be reduced. The result is a set of bandpass filters which add up to a constant magnitude transfer function (=allpass).
Here is an implementation of a 7-band-splitter. It supports full mono4, so you can easily pack/unpack for stereo processing (see inside).

[tester]

Martin, did I tell you that you are great?