Filter coefficients into a buffer?
Hi Guys,
Is it possible to create a FIR from the coefficients of a cascaded filtergraph?
I'd like to draw the EQ curve of the filtergraph with plot, but that is beyond me, yet, I can analyse frequency response of an IR with plot.
i am not sure about the exact relationship between calculating poles and zeros coefficients and creating an FIR function, but i believe it would be correct to say that the math might similar, but it is just not the same thing.
as you might know, coefficients for biquad have to be inside certain parameter ranges to work, while an FIR/IIR transfer functions are arbitrary, for example they can be constructed by adding two different functions into one function.
mine are based on old patches by mzed or l.dubois (or someone else, pardon i can never remember names), this is how a one pole lowpass would look... in this case, symetrical.
I see Roman, thank you very much for the help.
I've tried something similar in the other way around, like, the cascaded coeffs. to a filterdetail, then to a plot, just to draw the EQ curve with a single line, yet, no luck.
It seems that filterdetail works only with 1 filter, so, with 5 coeffs. only.
Now I have 5 times 10, since my filter is basically a 10 band EQ, where the I'd like to visulise the EQ curve in plot with a single line...
what you can do is running a spike to any existing filter, reverse-convolve it and use it as IR. but that is a highly questionable practice and probably not what you are looking for.
they do that for reflections in reverb algos, because there it make sense since you can combine delay and frequency/phase filtering into a single process.
Yes, I always look for quick "alternative" solutions, instead of learning how to connect the plot object to a cascaded filtergraph :S