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some zeros filters

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Robin. P. Clark 2019-09-16 14:30:42 +01:00
parent 211544b0b8
commit 756de6fee0
1 changed files with 32 additions and 9 deletions
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41
freq_analysis.c
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@ -94,16 +94,39 @@ main () {
}
// simple lag filter
// xz[0] = 0.125;
// yp[0] = 1.0;
// yp[1] = -0.875;
//
//
//simple 7/8th lag filter squared
xz[0] = (0.125*0.125);
xz[0] = 0.125;
yp[0] = 1.0;
yp[1] = -(2.0*0.875);
yp[2] = (0.875*0.875);
yp[1] = -0.875;
// simple 7/8th lag filter squared
//
// xz[0] = (0.125*0.125);
// yp[0] = 1.0;
// yp[1] = -(2.0*0.875);
// yp[2] = (0.875*0.875);
// simple bandpass
// (Z-1)(Z+1) = Z^2-1
// xz[0] = 1.0;
// xz[1] = 0.0;
// xz[2] = -1.0;
// yp[0] = 1.0;
// peaky x4 bandpass, no d.c. no high freq near nyquist.
// (Z^2-1)^2
//
// xz[0] = 1.0;
// xz[1] = 0.0;
// xz[2] = -2.0;
// xz[3] = 0.0;
// xz[4] = 1.0;
// yp[0] = 1.0;
// yp[1] = 0.0;
// yp[2] = 0.0;
//
for (i=0;i<NYQUIST;i++) {