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added 15/16th squared two pole low pass filter

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Robin P. Clark 2021-04-07 11:36:19 +01:00
parent 756de6fee0
commit 79466643b6
1 changed files with 12 additions and 3 deletions
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15
freq_analysis.c
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@ -87,6 +87,7 @@ main () {
COMPLEX x,x_num,x_den, x_ans_den, x_ans_num, ccc; COMPLEX x,x_num,x_den, x_ans_den, x_ans_num, ccc;
int i,j,k; // counters int i,j,k; // counters
double r; // angle in radians double r; // angle in radians
double sixteenth = 1.0/16.0;
for (k=0;k<10;k++) { // zero all the Z parameters for (k=0;k<10;k++) { // zero all the Z parameters
xz[k] = 0.0; xz[k] = 0.0;
@ -94,9 +95,9 @@ main () {
} }
// simple lag filter // simple lag filter
xz[0] = 0.125; // xz[0] = 0.125;
yp[0] = 1.0; // yp[0] = 1.0;
yp[1] = -0.875; // yp[1] = -0.875;
// simple 7/8th lag filter squared // simple 7/8th lag filter squared
@ -105,6 +106,14 @@ main () {
// yp[0] = 1.0; // yp[0] = 1.0;
// yp[1] = -(2.0*0.875); // yp[1] = -(2.0*0.875);
// yp[2] = (0.875*0.875); // yp[2] = (0.875*0.875);
//
// simple 15/16 lag filter squared
//
xz[0] = (sixteenth*sixteenth);
yp[0] = 1.0;
yp[1] = -(2.0*(1.0-sixteenth));
yp[2] = ((1.0-sixteenth)*(1.0-sixteenth));
// simple bandpass // simple bandpass
// (Z-1)(Z+1) = Z^2-1 // (Z-1)(Z+1) = Z^2-1