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Re: filtering out harmonic trend
From: |
Rafael Laboissiere |
Subject: |
Re: filtering out harmonic trend |
Date: |
Tue, 4 Dec 2007 15:18:58 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
* Francesco Potorti` <address@hidden> [2007-12-04 13:39]:
> I have a 200,000 samples measurement, which is a sort of noise with
> bandwidth in the order of the inverse of 500 samples. Superimposed to
> this noise there is a very slow sinusoid with a period of about 300,000
> samples. This means that my measurements do not even see a complete
> cycle of this sinusoid.
>
> I want to estimate the sinusoid (in order to remove it from the
> measurement). So I need some sort of very-low pass filter. However,
> usign a simple causal low-pass filter would give me a delayed output.
> Can anyone suggest some keyword for a noncausal filter to look for? I
> guess that it could be simple, because the bandwidths of signal and
> noise are so far away each other.
filtfilt
--
Rafael