Suggest a filter to remove the noise from the signal

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Gova ReDDy
Gova ReDDy 2013-9-18
评论： Image Analyst 2013-11-20
Can someone suggest a filter to remove the noise from the signal shown in this image (with the sampling rate being 500)?
  2 个评论
Jan
Jan 2013-9-18
编辑：Jan 2013-9-18
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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采纳的回答

Image Analyst
Image Analyst 2013-9-19
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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Manjuri
Manjuri 2013-11-20
problem has occured can give the details about noise separation from signal
Image Analyst
Image Analyst 2013-11-20
I don't understand the above comment or question by Manjuri.

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更多回答（1 个）

Jan
Jan 2013-9-18
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.
  2 个评论
Gova ReDDy
Gova ReDDy 2013-9-18
编辑：Gova ReDDy 2013-9-18
So, as shown in the link the signal is containing noise which is labeled with red colour.Any suggestion to remove this kind of noise. Thanks in Advance.
Jan
Jan 2013-9-19
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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