Thread Subject:

Effective Filter coefficients of parallel filters

Hello all,

I am trying to obtain the filter coefficients of 4 filters in parallel. Here is what I'm trying to do.

Hdc1 = dfilt.df1(b1,a1);
Hdc2 = dfilt.df1(b2,a2);
Hdc3 = dfilt.df1(b3,a3);
Hdc4 = dfilt.df1(b4,a4);

Hpar = parallel(Hdc1 ,Hdc2, Hdc3, Hdc4);

Since Hdc1...4 are of type dfilt.df1, I can access the filter co efficients using Hdc1.numerator, Hdc1.denominator. But, I'm not able to obtain the filter co-efficients of the effective parallel filter.

Could someone suggest me methods of obtaining the filter coefficients ([b,a] or the numerator-denominators of the H(z) ) of the effective parallel filter Hpar?

Thanks in advance