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i have a signal now i want to calculate the DC values of it

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Liaquat Ali
Liaquat Ali 2013-2-5
Suppose i have a signal which has AC and DC commponet.........
now i want to calculate the DC signal from it....
I have done low pass filterting as below
Fs = fs; % Sampling Frequency
Fpass = 0.8; % Passband Frequency
Fstop = 1; % Stopband Frequency
Apass = 1; % Passband Ripple (dB)
Astop = 80; % Stopband Attenuation (dB)
match = 'passband'; % Band to match exactly
% Construct an FDESIGN object and call its CHEBY1 method.
h2 = fdesign.lowpass(Fpass, Fstop, Apass, Astop, Fs);
Hd2 = design(h2, 'cheby1', 'MatchExactly', match);
s1_dc = filter (Hd2 , s1);
but still i could not get the required DC signal
what should i do ? do i need to use any other Low pass filter ??

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Honglei Chen
Honglei Chen 2013-2-5
编辑：Honglei Chen 2013-2-5
Theoretically, the DC component is simply
mean(s1)
If this is not what you want, could you elaborate a little more what you mean by DC signal?
  2 个评论
Liaquat Ali
Liaquat Ali 2013-2-5
I have a signal S1 which has low frequency values till 5 Hz.
Now i have a formula which is
R(i) = log10((s1_ac_dc(i))/s1_dc(i)) / log10((s3_ac_dc(i))/s3_dc(i));
Which means i have to divide the signal value with its DC value......
so for a signal S1 i need its DC value at that point.??
Honglei Chen
Honglei Chen 2013-2-5
what is the meaning of index i? In general DC value is a constant across the signal

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