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Re: How do I build low pass filter?

From: John Day
Subject: Re: How do I build low pass filter?
Date: Fri, 08 Jan 1999 15:56:39 -0500


Here are some ways to 'despeckle' data, depending on the nature of
the noise:

1. 'Salt and pepper' spikes are often easily removed by using a median
2. A low-pass filter will attenuate spikes. Be careful on choice of
filter, some can produce more artifacts than they eliminate. I usually
use a Gaussian filter to get best results.
3. 'Detect' spikes by integrating their energy and threshold them out.
Of course this won't work if spikes are highly energetic.

Hope that helps.


At 01:22 PM 1/8/99 +0100, Thomas Hoffmann wrote:
>Can anybody tell how I should proceed to filter out some "spikes"
>from a vector of data using Octave?
>If I visualize the vector I can see its basically regular structure which
>is disturbed by some zig-zags which I would like to eliminate (mainly to
>be able to find meaningful extrema of the basic structure).

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