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2.1.22.2.2.10 fft_lowpass


Contents

Description

Performs low pass filtering of signal. The filtering is performed by using FFT functions.

Syntax

int fft_lowpass( Curve & crvSignal, double dFc )


int fft_lowpass( vector & vecSignal, double dFc, vector * vecTime = NULL )

Parameters

crvSignal
[modify]Input: signal data; Output: filtered signal
dFc
[Input] cutoff frequency


vecSignal
[modify]Input: signal data; Output: filtered signal
dFc
[Input] cutoff frequency
vecTime
[Input] frequency sequence. default is NULL.

Return

OE_NOERROR: success

positive: FFT error code

Examples

EX1 

//Before compile this example, run the following LabTalk command in Command Window:
// 		run.LoadOC("Originlab\fft_utils.c", 16);
 
#include <fft_utils.h> 
void fft_lowpass_ex1()
{
    double dFc = 6.5;
    vector vecX;
    vector vecY;
    vecX.Data(1.0,10.0,1.0);
    vecY.Normal(10);
    Curve crvSignal(vecX, vecY);
    int iRet = fft_lowpass(crvSignal, dFc);
}


EX2 

//Before compile this example, run the following LabTalk command in Command Window:
// 		run.LoadOC("Originlab\fft_utils.c", 16);
 
#include <fft_utils.h> 
void fft_lowpass_ex2()
{
    double dFc = 6.5;
    vector vecX;
    vector vecY;
    vecX.Data(1.0,10.0,1.0);
    vecY.Normal(10);
    int iRet = fft_lowpass(vecY, dFc, &vecX);
}

Remark

See Also

fft_highpass

Header to Include

fft_utils.h

Reference