calculating Q for spl due to RLC notch filter
Is there such a thing as a "Q" for the notch in spl caused by a parallel RLC filter, and if so is it calculated similar to the Q for the notch in the impedance? I can't seem to find this defined anywhere.
Numbers below are for example only.
9016 -4.00 << (notch center freq)
Is it simply calculated at the point where the attenuation is .707 x SPL@ notch?
In this case where atten = 4.00 x .707 = 2.83, I'd be inclined to calculate Qspl as follows:
Qspl = [9016/(11548-7039)] = 2.0
What I'm leading toward is trying to size up the RLC values for a notch filter, when the Q for spl can be obtained from measured data.
the 200% Norske
Q is defined for any second order system response ie any RLC. So you would measure it the same way for a speaker driver or a sallen key filter stage. Q = central freq /half power BW
Hint use 3 dB away from central point not 0.707
If meas. using voltage then 0.707 is correct.
Vp=1 V then 20log*1/0.707= 3 dB
Thanks Ron. Nice little spreadsheet. :)
|All times are GMT. The time now is 05:55 AM.|
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright ©1999-2016 diyAudio