Asked by Lisa Justin
on 20 Feb 2012

Why does filters generally have a magnitude of 1?

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Answer by Wayne King
on 20 Feb 2012

Accepted answer

Hi Lisa, Filtering a signal usually implies convolving the signal with the impulse response of a linear time-invariant system.

In the frequency domain this is equivalent to mulitplying the frequency response of the signal with the frequency response of the filter.

Accordingly, it is desirable to have the magnitude of the filter as close to 1 as possible in the passband, so that in the passband, the frequency content of the signal is not modified in magnitude, just in phase.

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