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filter problem
I used "fdatool" to design a filter to filter slow wave (1-4 Hz), and it works well. However, I found that the filtered wave looks significantly different from the raw trace. Then I computed the power of raw trace and the filtered wave, and found that the powers are identical at the filtered bandpass, suggesting the filter is valid. So I am wondering why the shape of filter trace is so different from the raw trace.
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 Yuchun
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12/14/2009 7:17:22 AM |
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On 14 Des, 08:17, "Yuchun Zhang" <yuch...@gmail.com> wrote:
> I used "fdatool" to design a filter to filter slow wave (1-4 Hz), and it =
works well. However, I found that the filtered wave looks significantly dif=
ferent from the raw trace. Then I computed the power of raw trace and the f=
iltered wave, and found that the powers are identical at the filtered bandp=
ass, suggesting the filter is valid. So I am wondering why the shape of fil=
ter trace is so different from the raw trace.
Because you filtered away everything outside the passband
of your filter? A filter that leaves the same data at the
output as was fed into the input is useless.
Rune
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Rune
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12/14/2009 10:42:58 AM
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