5. Filters specified in both amplitude and group time
With the exception of an analytical solution (Lerner filters, § 5.3 ), there are practically only numerical solutions to this type of problem. However, if the group time specifications are not too stringent, a solution can often be found by choosing an attenuation function with minimal phase shift. We'll look at these cases in turn.
5.1 Solutions using an attenuation filter
Examination of the group time behavior of a minimum phase-shift attenuation filter shows that the steeper...
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Filters specified in both amplitude and group time
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