[music-dsp] crossover filters for compressor
didid at skynet.be
Mon Mar 19 02:04:36 EDT 2007
I was thinking of what could work as a good crossover filter for a 3-band
multiband compressor, without using FIR's.
I can imagine:
-a simple lowpass & highpass (or 2 lowpass), subtracted from the original
signal to give the third band. But due to phasing problems, this will work
only with simple 6dB IIRs, right?
-a higher-order low & highpass, and live with the fact that the mid band
would be more the residual than the mid band.
I'm only worried that each band won't have the same compression settings, so
they should be separated enough. But maybe it's not important.
-a low & highpass, but involving 2 allpass to correct the phase problem so
that the residual will really be the mid. I have no idea how to compute that
allpass, and if it's even doable, though.
-a low, band & highpass, living with the fact they won't sum up like the
original signal (or are there IIR's designed for this?)
-using minimum-phase IIR's? Are there IIR's really better than others for
this kind of stuff? I don't know much about this either.
I was wondering if one of those methods was more common than the others.
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