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Old 17th July 2006, 02:35 AM   #1
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GuyPanico's Avatar
Join Date: Mar 2005
Location: Euless, TX
Default Need a notch filter calculator.

Are there any notch filter calculators? I'd like to tame the mountain at 7khz I have. The calculator I did find will only attenuate the peak -3db. I need more like -6db however.
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Old 17th July 2006, 02:44 AM   #2
jamikl is offline jamikl  Australia
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There is an Excel one available called notchcalc. Can't remember where I got it from. Displays the depth and the width of what you calculate on the sheet. This may help. Googling under that name mya find it.
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Old 17th July 2006, 02:46 AM   #3
jamikl is offline jamikl  Australia
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Old 17th July 2006, 03:24 AM   #4
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a notch filter is a "band reject filter" -- sort of like a the hole in a donut -- you sum a high pass and low pass filter -- use resistors to lower the Q -- it can be done with passive devices if you have a lot of patience.

best to get a CAD program like SwitcherCad (free from linear tech) and play around with the RLC values.

you can also make some valiant assumptions with respect to the input impedance of the amplifier and use an RC notch filter, or just fix the input value of the amplifier with a resistor and plug and play.

an active notch filter can have the Q continuously adjusted. most often people use active notch filters in applications like hum removal or to notch out the fundamental frequency for analysis of distortion residuals.
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Old 17th July 2006, 02:47 PM   #5
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Location: Near Vancouver
I like to use this one
planet10 needs your help:
Let's help Ruth and Dave
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