Tue Mar 19 14:04:48 EDT 2013

Impulse-invariant high-pass filter: what does it mean?

An interesting conceptual problem: it is possible to define the
behavior of a low pass filter based on the impulse-invariant transform
(pole mapping).

The same doesn't work for a high-pass filter, since the high pass band
will alias down into the stopbad, killing the high-pass property.

So, how should it be implemented?  Maybe it only makes sense using a
bilinear transform?