Why Does Signal Magnitude Change with 5th Order Butterworth Filter?

[rain2359]

hi,

May I know if we were to pass a signal into a 5th order butter worth filter, why would its magnitude decrease? Should the magnitude decrease, or it should remain the same?

thank you.

 

[edmondng]

depends on what type of filter.

http://en.wikipedia.org/wiki/Butterworth_filter