I have found two equations which describe affect on signal and noise when using IIR filter:

For signal: Equation for signal

For noise: enter image description here

Can someone explain how to get these equations?

  • 1
    \$\begingroup\$ no, since these are totally out of context, we can't tell you the context. \$\endgroup\$ – Marcus Müller Mar 1 at 11:30

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