SignalUtils.RemoveDC Method

Overload List

#	Signature	Description
1	TVec RemoveDC(TVec SrcDst)	In-place version of the RemoveDC method.
	└ indexed: TVec RemoveDC(TVec SrcDst, Int32 Index, Int32 Len)
2	void RemoveDC(TVec Src, TVec Dst)	Not-In-place version of the RemoveDC method.
	└ indexed: void RemoveDC(TVec Src, TVec Dst, Int32 SrcIndex, Int32 DstIndex, Int32 Len)

Overload 1: TVec RemoveDC(TVec SrcDst)

In-place version of the RemoveDC method.

#	Name	Type	Description
1	SrcDst	TVec	source TVec

Returns: TVec

Indexed: TVec RemoveDC(TVec SrcDst, Int32 Index, Int32 Len)

Remove the DC component.

#	Name	Type	Description
1	SrcDst	TVec	source TVec
2	Index	Int32	start index
3	Len	Int32	element count

Returns: TVec

Remarks:

Subtract the mean value of Data from Data. Works for stationary signals. Use a highpass FIR filter for signals with varying mean value or call the DcFilter routine, for an IIR version of the DC filter. Removing the DC component without applying a true FIR
or IIR filter is often convinient prior to frequency analysis, because there is no run-in or run-out and no filter delay.

Examples

using Dew.Math;
using Dew.Math.Editors;
using Dew.Math.Units;
using Dew.Signal;
using Dew.Signal.Units;
using Dew.Math.Tee;
using Dew.Signal.Tee;

private void button1_Click(object sender, EventArgs e)
{
    Vector b = new Vector(0);
    Vector c = new Vector(0);
    Vector Response1 = new Vector(0);
    Vector Response2 = new Vector(0);

    SignalUtils.Tone(b, 256, 6.0 / 256, 0, 1, false);
    b = b + 4;
    c.Copy(b);
    SignalUtils.RemoveDC(b);
    MtxVecTee.DrawIt(new TVec[2] {c,b}, new string[2] {"Original signal","Signal without DC"},"Time signals", false);
    SignalUtils.FrequencyResponse(c, null, Response1, 1, true, TSignalWindowType.wtRectangular, 0);
    SignalUtils.FrequencyResponse(b, null, Response2, 1, true, TSignalWindowType.wtRectangular, 0);
    MtxVecTee.DrawIt(new TVec[2] {Response1,Response2}, new string[2] {"Spectrum: original signal","Spectrum: signal without DC"}, "Frequency spectrum", false);

See Also: SignalUtils.FirFilter, SignalUtils.KaiserImpulse, OptimalFir.RemezImpulse

Overload 2: void RemoveDC(TVec Src, TVec Dst)

Not-In-place version of the RemoveDC method.

#	Name	Type	Description
1	Src	TVec	source TVec
2	Dst	TVec	source TVec

Result: stored in self (calling object)

Indexed: void RemoveDC(TVec Src, TVec Dst, Int32 SrcIndex, Int32 DstIndex, Int32 Len)

Not-in-place version of the RemoveDC method with source and destination indexes.

#	Name	Type	Description
1	Src	TVec	source TVec
2	Dst	TVec	source TVec
3	SrcIndex	Int32	source start index
4	DstIndex	Int32	destination start index
5	Len	Int32	element count

Result: stored in self (calling object)

Remarks:

The Src data is preserved, the destination will hold the result. If Len is not specified, the maximum possible value will be used.