hello Ted,
I had some time so I tried your code in Arduino IDE and it compiled!
#define NZEROS 16
#define NPOLES 16
const double GAIN = 2.733054109e+10;
const double A = -0.9999996903;
const double B = 15.0671415160;
const double C = -107.3207279400;
const double D = 479.5899447000;
const double E = -1504.6930028000;
const double F = 3514.0764694000;
const double G = -6318.5794832000;
const double H = 8922.2254164000;
const double I = -9998.7316198000;
const double J = 8922.2257618000;
const double K = -6318.5799724000;
const double L = 3514.0768775000;
const double M = -1504.6932358000;
const double N = 479.5900375300;
const double P = -107.3207528700;
const double Q = 15.0671455990;
double xv[NZEROS + 1], yv[NPOLES + 1];
void setup() {
// put your setup code here, to run once:
}
void loop() {
double Next_Input_Value, Next_Output_Value;
xv[0] = xv[1]; xv[1] = xv[2]; xv[2] = xv[3]; xv[3] = xv[4]; xv[4] = xv[5]; xv[5] = xv[6]; xv[6] = xv[7]; xv[7] = xv[8]; xv[8] = xv[9]; xv[9] = xv[10]; xv[10] = xv[11]; xv[11] = xv[12]; xv[12] = xv[13]; xv[13] = xv[14]; xv[14] = xv[15]; xv[15] = xv[16];
xv[16] = Next_Input_Value / GAIN;
yv[0] = yv[1]; yv[1] = yv[2]; yv[2] = yv[3]; yv[3] = yv[4]; yv[4] = yv[5]; yv[5] = yv[6]; yv[6] = yv[7]; yv[7] = yv[8]; yv[8] = yv[9]; yv[9] = yv[10]; yv[10] = yv[11]; yv[11] = yv[12]; yv[12] = yv[13]; yv[13] = yv[14]; yv[14] = yv[15]; yv[15] = yv[16];
yv[16] = (xv[0] + xv[16]) - 8 * (xv[2] + xv[14]) + 28 * (xv[4] + xv[12])
- 56 * (xv[6] + xv[10]) + 70 * xv[8]
+ ( A * yv[0]) + ( B * yv[1])
+ (C * yv[2]) + (D * yv[3])
+ (E * yv[4]) + (F * yv[5])
+ (G * yv[6]) + (H * yv[7])
+ (I * yv[8]) + (J * yv[9])
+ (K * yv[10]) + (L * yv[11])
+ (M * yv[12]) + (N * yv[13])
+ (P * yv[14]) + ( Q * yv[15]);
Next_Output_Value = yv[16];
}
As I said before, don't expect to see anything as Next_Input_Value and Next_Output_Value are both internal variables. Once you decide what your input and output are gonna be subtitute those variables for them
You will also need to know your sampling rate (how often to read your input in the loop)