[Clam-devel] building 3 bands equalizer

[Pau Arumi]

En/na globot ha escrit:
> hi,
> 
> here is what i wanted to do :
> a simple equalizer with 3 section :
>    - from 0 to lowFreq, apply lowGain
>    - upper than highFreq, apply highGain
>    - between lowFreq and highFreq apply a progressive gain
> 
> with lowFreq, highFreq user defined frequencies.
> with lowGain, highGain user defined gain in db (from 0 to -100)
> 
> I was thinking that the threeBandFilter might have been usefull, for 
> this task. But each time i use it i have some very strange glitch (look 
> like some noise is generated when highGain, midGain or lowGain are 
> different from 0)
> 
> i did my test with a generated perfect sinusoidal signal from 20 to 
> 20000Hz (with a constant amplitude) using CLAM 1.1.0 (not svn)
> 
> I probably miss used it, but can't figure out how to do. so can i have 
> some explaination about :
> -threeBandFilter
> -threeBandAM
> -vocoder
> -threebandcompressor
> 
> i want to know what exactly do those class, and what are the parameter 
> (range of value, signification ...) because i am not realy an expert in 
> sound processing and now i got a little confuse.
> 
> how can i make an equalizer ? with the vocoder ? (it look like it 
> generate the same kind of noise as the 3 band filter)
> 
> thanks
> 
> ps: it would be cool to add details in the doc too.


Agree, they need some documentation.
I'm afraid Xavier, the author of these classes, is on holidays till
September. So ask again then in case you still have questions.
Till then I suggest a little of trial-and-error alternated with
code reading (and why not? post your findings)

Cheers
Pau