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--- Begin Message ---> On 12/05/2023 3:29 AM EST Frank Sheeran <[email protected]> wrote: > > > Andy Simper said: > > you need to look at the > > frequency response near nyquist and see how closely it matches > > I think that's mathematically true but how much can people actually hear > above 10kHz anyway? Unless they're like under 12 years old and in that case > who cares what their opinion is of the sound? :-D Maybe I just have too much > hearing damage from my years playing reggae keys but when I was doing > software dev in this stuff a decade ago I couldn't really hear the top octave > at all (at age then of 45 or so). >And it also depends on how flat the target frequency response is up there. The frequency warping of the bilinear transform does not actually hurt high-pass or high-shelf filters. Frequency warping *will* mess up low-pass because it maps the analog infinity to the digital Nyquist. So an implied zero at s=inf maps to a real zero at z=-1. But if there is no zero or pole way the hell up there, the digital zeros and poles will be okay. -- r b-j . _ . _ . _ . _ [email protected] "Imagination is more important than knowledge." . . .
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