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iirdf1 coefficients

Question asked by anselm on Oct 4, 2012
Latest reply on Nov 5, 2012 by AndreasL

Hello,

 

how does the function coeff_iirdf1_fx16 work?

 

I want to calculate the coefficients on my own to avoid instability.

 

In the documentation the vector coeffs is described as follows:

 

[b_0, -a_01, b_01, -a_02, b_02, ..., -a_n1, b_n1, -a_n2, b_n2, scale_factor ]

 

What is b_0? Is it the coefficient of the first stage and every other stages b_0 is assumed to be 1?

What is the scale_factor and how is it calculated?

 

I already decomposed my 4th order bandpass transferfunction into biquad stages (see attachement), but im stuck with calculating the coeff array.

 

 

Thanks in advance

 

Anselm

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