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Difference between 2nd order and Butterworth 1 year 3 months ago #49910

  • miszkoo
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Hi,

I have a quastion about difference between 1st order 2nd order filters and other filters like Butterworth, Linkwitz-Riley, Chebyshev, Bessel.
What does mean 1st or 2nd order filter in digital domain? I know that order is connected with slope but a don't have idea what are differences. I methinks that 1st and 2nd order filters are equivalent analog RC filters, but I'm not sure.
Can You give any idea where can I read about it.

Best regards
Michał Kmiecik

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Difference between 2nd order and Butterworth 9 months 1 week ago #53154

  • denver8me4dinner
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Yes it’s same principle as rc or analog filters

After the pass band the attenuation of the filter grows proportionally to the number of poles...

The digital filter is a digital representation of the analog filter.

I’m pretty sure it’s the maximum number of delay elements in the design IIRC

Instead of caps and coils it’s coefficients and biquads ,
Hope that helps

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Difference between 2nd order and Butterworth 1 month 2 days ago #57037

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The only thing I would add , is capacitive resistance and inductive reactance will affect the analog filter where the digital filter does not see what goes on between the amp and said loudspeaker
 

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