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how to use a low pass filter on a sequence

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ali alkhudri
ali alkhudri 2015-4-22
编辑： Jan 2018-3-7
Hi I have a rr sequence contains different amplitudes .. I want to use a low pass filter do get rid of high amplitudes in the rr sequence who to do it? thanks

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回答（2 个）

Mahendra
Mahendra 2018-3-7
for example the simplest low pass filter is y(n) = x(n)+x(n-1); {x is the input sequence, y is the filtered sequence}
Y(1) = X(1);
Y(2:end) = X(2:end)+x(1:end-1);
Jan
Jan 2018-3-7
编辑：Jan 2018-3-7
It depends on what the physical nature of the noise is. Maybe a Butterworth filter helps, or a Savitzky-Golay-filter, or a moving average? We cannot decide this reliably only based on the image of the signal. Do you have any further information?
y = movemean(x, 5);
y = sgolayfilt(x, 3, 15);
[b, a] = butter(3, 0.8, 'low');
y = filter(b, a, x); % or filtfilt

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