Suggest a filter to remove the noise from the signal
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Can someone suggest a filter to remove the noise from the signal shown in this image (with the sampling rate being 500)?
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Jan
2013년 9월 18일
편집: Jan
2013년 9월 18일
On imageshack I see a large banner in the foreground, which wants me to click on a "Enter to win" button, as far as I understand. The small [x] on the top right does not close the banner. I hate such stuff.
@GovaReDDy: It is not your fault. TMW hsitates for years to allow storing pictures on their server. But this is the only location where pictures concerning the forum should be hosted.
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Image Analyst
2013년 9월 19일
I'd try a modified median filter
% Take median filter.
medianFilteredSignal = medfilt2(signal, [1,3]);
% Find where signal is bad
badElements = signal < 400 | signal > 900;
% Replace bad elements with median filtered values.
noiseFreeSignal = signal; % Initialize.
noiseFreeSignal(badElements) = medianFilteredSignal(badElements); % Do the replacement
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Jan
2013년 9월 18일
It is impossible to suggest a filter based on the information of the sample frequency only. We cannot know the nature of the noise and of the wanted signal. You could be interested in low or high frequencies or in a specific band. But the filter parameters must depend on these details. So please provide more information.
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Jan
2013년 9월 19일
It matters if you have some peaks only, or if a frequency spectrum of the noise is know, if you know the frequency spectrum of the wanted signal and can suppress anything outside it.
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