<div dir="auto"><div><div class="gmail_quote"><div dir="ltr" class="gmail_attr"> <<a href="mailto:rburnett@richieburnett.co.uk">rburnett@richieburnett.co.uk</a>> skrev:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">...<br>
It's also interesting how the Q factor is larger at the low frequency <br>
end of the range, and lower when the resonant frequency is at the high <br>
end. This is a bit unusual.<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto">Still, there are some EQ designs with similar variations. Not to mention those with different Q for different peak/notch heights.</div><div dir="auto"><br></div><div dir="auto">We usually try to make synth filters behave "better" than that, but odd behavior can be useful. I once had to design a 2-pole bandpass VCF with only one VCA available. Having only one of the two filter poles voltage-controllable gave a VCF that increased or decreased its Q as the cutoff was changed (depending on which pole was the voltage-controlled one). Since the audio material was already quite skewed in its spectrum, one of these two skewed filter behaviours gave a more consistent output level than a normal filter would.</div><div dir="auto"><br></div><div dir="auto">/mr</div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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