2.1.22.3.12 ocmsp_impz

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

Description

Impulse response of digital filter, calculating by coefficients of transfer function.

Syntax

int ocmsp_impz( double * ph, double * pt, UINT n, const double * pb, UINT nb, const double * pa, UINT na, double fs = 1.0 )

Parameters

ph: [output] impulse response, size n
pt: [output] sample times, size n
n: [input] size of impulse response
pb: [input] filter numerator coefficients
nb: [input] size of numerator coefficients
pa: [input] filter denominator coefficients
na: [input] size of denominator coefficients
fs: [input][optional] sample frequency, the samples are spaced 1/fs unit apart. Default 1

Return

Return OE_NOERROR if succeed, otherwise, non-zero error code is returned (OE_NULL_POINTER, OE_INVALID_SIZE or OE_BAD_PARAM)

Examples

EX1

#include <ocmsp.h>
void ocmsp_impz_ex1()
{
    vector b = {0.018886917952608, 0.169982261573470, 0.679929046293879,
                1.586501108019050, 2.379751662028575, 2.379751662028575,
                1.586501108019050, 0.679929046293879, 0.169982261573470,
                0.018886917952608};
    vector a = {1.000000000000000, 1.791581352788596, 2.531899880898121,
                2.118229420341933, 1.370756294393234, 0.609038913076474,
                0.199331556962956, 0.043104731015281, 0.005804261654309,
                0.000355580604258};

    Worksheet wks = Project.ActiveLayer();
    if(!wks)
        return;            

    int nRet = 0, na = a.GetSize(), nb = b.GetSize();    
    vector& vt = wks.Columns(0).GetDataObject();
    vector& vh = wks.Columns(1).GetDataObject();
    
    UINT nh = 0;
    int type = 0;
    if (0 != (nRet = ocmsp_impzlength(&nh, b, nb, a, na)))
    {
        printf("ocmsp_impzlength failed, error code = %d\n", nRet);
        return;
    }

    vt.SetSize(nh); vh.SetSize(nh);
    
    if (0 != (nRet = ocmsp_impz(vh, vt, nh, b, nb, a, na)))
    {
        printf("ocmsp_impz failed, error code = %d\n", nRet);
        return;
    }
}