fft_lowpass

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 header to Include
9 Reference

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);
}