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The attenuation rate is also called?

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The attenuation rate is also called?

(a) Roll off

(b) Roll in

(c) Envelope delay

(d) Ripple

I have been asked this question in my homework.

This question is from Filters topic in portion Fundamentals of Electronics of Avionics

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Correct choice is (a) Roll off

The explanation is: Roll off is also called the attenuation rate, roll-off is the rate of change of amplitude with frequency in a filter. The faster the roll-off, or the higher the attenuation rate, the more selective the filter is, i.e., the better able it is to differentiate between two closely spaced signals, one desired and the other not.

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