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Bandwidth for bandpass filter?

SigmaDSP & SigmaStudio mdot Jun 15, 2011 00:00 2 replies Original on forum ↗
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mdot Question
Jun 15, 2011 00:00

Quick question...

How do I set the bandwidth for a bandpass filter?

I am trying to use a 2nd order filter to make a bandpass filter, centered at 3kHz and I need it to span about 4kHz of bandwidth. I'm not a filter expert so any help would be greatly appreciated.

Natan Reply
Jun 16, 2011 00:00

The easiest way to make any filter in my opinion is with the Parametric EQ tool.This is located at:

Filters -> Second Order -> Double Precision -> Multichannel -> Parametric EQ

To make a bandpass you can use both a highpass and lowpass filter. For reference see this:

http://en.wikipedia.org/wiki/Band-pass_filter

Here is a simple example that follows your filter specifications; I put the highpass at 1kHz and the lowpass at 5kHz (3kHz +/-2kHz). Note the frequency values mark -3dB points of the filter more commonly know as cutoff frequency:

http://en.wikipedia.org/wiki/Cutoff_frequency

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mdot Reply
Jun 16, 2011 00:00

Thank you.

That was exactly the answer I was looking for and very well explained.