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Frequency Response for Butterworth and Bessel

Question asked by Windy on Apr 6, 2011

Hi Sir ,

 

According  to Brett's information , we know how 48dB Butterworth and Bessel filter  works in SigmaDSP, we also develope a PC control software , which allow  our customer to control the machine developed by us , it's similar with  Sigmastudio, but our software is unable to program the SigmaDSP. our  software have a function similar with the crossover module in Sigmastudio , that  it got a frequency response figure , which user can drag it. With the  caculation expression inside of FilterMathCalculations.pdf, we make a  frequency response figure for Butterworth and Bessel filter under 48dB,  but we cannot make a frequency response figure for 48dB Butterworth and  Bessel filter .

 

There is not caculation expression for 48dB Butterworth and Bessel's frequency response in FilterMathCalculations.pdf , that it only got 24db's . We need the caculation expression for 48dB Butterworth and Bessel's frequency reponse.

 

Please advise ,thanks.

 

Best Regards,

 

Windy

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