【文件属性】：
文件名称：带通滤波 代码
文件大小：3.13MB
文件格式：NEXE
更新时间：2022-05-06 04:06:55
自团伙
float DigFil(invar, setic)
float invar; int setic;
/******************************************************************************/
/* Filter Solutions Version 2009 Nuhertz Technologies, L.L.C. */
/* www.nuhertz.com */
/* +1 602-279-2448 */
/* 3rd Order Band Pass Butterworth */
/* Bilinear Transformation with Prewarping */
/* Sample Frequency = 5.000 KHz */
/* Standard Form */
/* Arithmetic Precision = 4 Digits */
/* */
/* Center Frequency = 300.0 Rad/Sec */
/* Pass Band Width = 20.00 Rad/Sec */
/* */
/******************************************************************************/
/* */
/* Input Variable Definitions: */
/* Inputs: */
/* invar float The input to the filter */
/* setic int 1 to initialize the filter to zero */
/* */
/* Option Selections: */
/* Standard C; Initializable; Internal States; Not Optimized; */
/* */
/* There is no requirement to ever initialize the filter. */
/* The default initialization is zero when the filter is first called */
/* */
/******************************************************************************/
/* */
/* This software is automatically generated by Filter Solutions */
/* no restrictions from Nuhertz Technologies, L.L.C. regarding the use and */
/* distributions of this software. */
/* */
/******************************************************************************/
{
float sumnum=0.0, sumden=0.0; int i=0;
static float states[6] = {0.0,0.0,0.0,0.0,0.0,0.0};
static float znum[7] = {
-7.968e-09,
0.0,
2.39e-08,
0.0,
-2.39e-08,
0.0,
7.968e-09
};
static float zden[6] = {
.992,
-5.949,
14.88,
-19.86,
14.92,
-5.981
};
if (setic==1){
for (i=0;i<6;i++) states[i] = [i] = [i]*invar;
return 0.0;
}
else{
sumnum = sumden = 0.0;
for (i=0;i<6;i++){
sumden += states[i]*zden[i];
sumnum += states[i]*znum[i];
if (i<5) states[i] = states[i+1];
}
states[5] = invar-sumden;
sumnum += states[5]*znum[6];
return sumnum;
}
}
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