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IIR Bessel filter coefficients

Can someone tell me why I get 20 "Reverse" coefficients and 25 "Forward" coeffcients for a band pass 10 pole Bessel filter?

I expected 20 for both forward & reverse

 

 

Thanks for any reaction.

 

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Check this out,

 

 why the number of Feed Forward and Feed Back co-efficients are varied while designing an IIR filter.

 

 

AshwiN,

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