Hello,

I know well my DSP theory, but I am not deeply familiar with PD.

I just wanted to know how the FIR~ thing works (iemlib). If you know any other possibility for creating a FIR filter, let me know. Is there some objects for IIR filters?

Thank you so much!

lu'

I'm not really aware of the math theory to design Fir and IIR filters but if i remember well, you should have a look to the miller's book. In the last chapter actually published.

there:
http://crca.ucsd.edu/~msp/techniques/latest/book-html/

Thank you for the link. The chapter in question use the delay line object (delay write and delay read) to create filters ... maybay like in CSound with delayw and delayr (something like this).

But I search for other things like the FIR~ object which I am not able to use. I had just discovered fexpr~ to create either Finite Impulse Response (FIR) filters or Infinite Imp Resp. filters (IIR).

My goal is rather simple (I wish i would be able to do it with FIR~ or pixfir~ (although I have to understand how to compile a library and install it ... I am relatively new to PD!)) : filter an audio input with a given impulse response (like for conventional transverse filter) which could be manually draw in a graph/array ... its just about convolution.

Any suggestion much appreciated since Matlab is not really good to create music!

Thank!

After some work and googling, I finally reply to my own tek question!

Here is the FIR~ syntax :

FIR~ array_name 1024

Where 1024 (or an input arg) define the array size. The resulting filter is working well.

Any tips about filter~ or pixfir~?