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The theory of the high pass filter to remove 2.5 Vdc offset

Submitted by Guest on Sun, 10/03/2013 - 01:04

Hi,

    I have some question for the high pass filter to measure Voltage signal for the power monitor.

=-----------------------------------------------------------------------------------------------------

//Apply digital high pass filters to remove 2.5V DC offset (centred on 0V).
//-----------------------------------------------------------------------------
filteredV = 0.996*(lastFilteredV+sampleV-lastSampleV);

 

Can anyone can explain the theory behind this?

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Robert Wall's picture

Re: The theory of the high pass filter to remove 2.5 Vdc offset

Submitted by Robert Wall on Sun, 10/03/2013 - 02:39.

Here

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calypso_rae's picture

Re: The theory of the high pass filter to remove 2.5 Vdc offset

Submitted by calypso_rae on Mon, 11/03/2013 - 09:25.

There's a similar thread, with plenty of discussion, at http://openenergymonitor.org/emon/node/932

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