shama

I'm trying to make a 4 band parametric EQ but i'm not able to do it.

I find and watch che object filtergraph with cascade method but i don't understand how i have to use for my 4 band eq.

I want made an eq with parametres changed by knob (like an hardware eq [but with graphic rappresentation]) or by mouse modifing che values in graph (like a software eq [eq in logic, pro tools, etc..] ).

If you could help me I would be grateful because I don't understand...

If you could help me  I would be grateful because I don't understand...

4-band-eq-how-to-made

You will probably want to use peaknotch rather than bandpass filters for the middle two [filtergraph~]s. This can be changed from the object inspector.

Holland Hopson wrote on Tue, 21 April 2009 20:15

I don't understand how to make the 4 band... 1 band (1 filter [bandpass, lowshelf, peak etc] it's ok, but i don't understand how to make 4 band.

I read the cascade~ object and biquad~ object but i don't understand very well how them working, above all the biquad~ object...

Holland Hopson wrote on Tue, 21 April 2009 20:15Here's a start using cascade~.

in case you wonder how to use the filtergraph for more that one biquad, this is not possible. you can only use it for displaying a curve of more than one set of coefficients.

if you are building a fixed frequency eq you can easily use a transparent pictslider object for Q and gain by putting it over the filtergraph, if you build a normal eq this is too difficult and your best bet are additional sliders and knobs beside the graph.

in case you wonder how to use the filtergraph for more that one biquad, this is not possible. you can only use it for displaying a curve of more than one set of coefficients.
if you are building a fixed frequency eq you can easily use a transparent pictslider object for Q and gain by putting it over the filtergraph, if you build a normal eq this is too difficult and your best bet are additional sliders and knobs beside the graph.

Roman Thilenius wrote on Wed, 22 April 2009 07:53

I want to make a parametric eq, not with fixed frequency.

i don't understand the object [biquad] and how i can use the pictslider over the filtergraph.

An example' patch of 4 band eq is not possible to find or see on the internet? I want to study how to male this eq, is not for commercial-work or similar... only personal study

Roman Thilenius wrote on Wed, 22 April 2009 07:53
in case you wonder how to use the filtergraph for more that one biquad, this is not possible. you can only use it for displaying a curve of more than one set of coefficients.
if you are building a fixed frequency eq you can easily use a transparent pictslider object for Q and gain by putting it over the filtergraph, if you build a normal eq this is too difficult and your best bet are additional sliders and knobs beside the graph.

I want to make a parametric eq, not with fixed frequency.
i don't understand the object [biquad] and how i can use the pictslider over the filtergraph.

An example' patch of 4 band eq is not possible to find or see on the internet? I want to study how to male this eq, is not for commercial-work or similar... only personal study


Here's an expanded version of the patch I posted previously. I've included another UI approach using the nfilters message to filtergraph~. Hope this helps.

Shama,
Here's an expanded version of the patch I posted previously. I've included another UI approach using the nfilters message to filtergraph~. Hope this helps.

biquad~ IS a difficult object, but still better than FIR filters based on transfer functions, because you have to program those yourself.

it has 3 bands, and uses the filtergraph object to calculate the coefficients for biquad. then it displays the result of all three filters in another filtergraph. typically setup will put filters in a series, then disallow crossing the freqeuncy settings. sometimes

if you want to add Q control you will find out yourself

how it works, just look how i did it for the frequency.

this patch is not perfect but probably better for you than the biquad helpfile.

shama wrote on Wed, 22 April 2009 22:43
I want to make a parametric eq, not with fixed frequency.
i don't understand the object [biquad] and how i can use the pictslider over the filtergraph.

i attach a simple EQ of mine. 
it has 3 bands, and uses the filtergraph object to calculate the coefficients for biquad. then it displays the result of all three filters in another filtergraph. typically setup will put filters in a series, then disallow crossing the freqeuncy settings. sometimes
parallel biqads also make sense.

if you want to add Q control you will find out yourself
how it works, just look how i did it for the frequency.

Many thanks at all, i make this eq, i'm testing it now!

I help myself with che tutorial "guitar processing", where there's an eq!

Roman Thilenius, your eq is beautiful but it's complicated for my to understand... many objects i don't know well.. 

You would want to use cascade~ not biquad, or look into svf~

You would want to use cascade~ not biquad, or look into svf~
This is for studying:  

the 110.OLS-i-3 abstraction is missing. Love the Koblo look, btw,

Roman,
   the 110.OLS-i-3 abstraction is missing. Love the Koblo look, btw,
cheers
Roger


roger.carruthers wrote on Mon, 27 April 2009 12:01

you probably also noticed that this -25 +25 seems somehow wrong... and yes, it is.

i bought some webspace yesterday so i can re-up the 2007 collection soon.

roger.carruthers wrote on Mon, 27 April 2009 12:01Roman,
   the 110.OLS-i-3 abstraction is missing. Love the Koblo look, btw,
cheers
Roger

all that mass of long text - how do I get that into max to look like a patch?

https://cycling74.com/forums/common-max-arcana

Check the Common Max Arcana thread:
https://cycling74.com/forums/common-max-arcana


thanks - sorry, common posting, but couldn't find it. All works, cheers!

thanks - sorry, common posting, but couldn't find it.  All works, cheers!


4 Band EQ: how to made?