Filter slopes

Caloroso, Michael E CalorosoME at
Mon Nov 1 22:20:17 CET 1999

> Can filters slopes be obtained in other multiples than 6dB/oct? For example, I
> feed a signal to a first-order and a second-order filter in parallel, with the
> same fc. If the outputs are mixed together, what is the final slope of the
> filtered signal?
That's a difficult one to predict.  You'll hear a mix of some of the first-order and the second-order, the driving factor as to which harmonics are audible and which are cancelled depends on the phase shift relationship and output amplitude between the two filters.  At the -3dB point of both filters the output signal is 180 degrees out of phase with the input, but the phase and amplitude match ends there.

Opinions (and mistakes) expressed herein are my own and not those of my employer.

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