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chore: group delay

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TT 2019-10-16 23:50:07 +09:00
parent 7ad51be1e4
commit 55cacef4d4
1 changed files with 16 additions and 20 deletions
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36
plot.c
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@ -502,6 +502,20 @@ cartesian_scale(float re, float im, int *xp, int *yp, float scale)
*yp = HEIGHT/2 - y; *yp = HEIGHT/2 - y;
} }
static float
groupdelay_from_array(int i, float array[101][2])
{
if (i == 0) {
float deltaf = frequencies[1] - frequencies[0];
return groupdelay(array[0], array[1], deltaf);
} else if (i == 100) {
float deltaf = frequencies[i] - frequencies[i-1];
return groupdelay(array[i-1], array[i], deltaf);
} else {
float deltaf = frequencies[i+1] - frequencies[i-1];
return groupdelay(array[i-1], array[i+1], deltaf);
}
}
uint32_t uint32_t
trace_into_index(int x, int t, int i, float array[101][2]) trace_into_index(int x, int t, int i, float array[101][2])
@ -519,16 +533,7 @@ trace_into_index(int x, int t, int i, float array[101][2])
v = refpos - phase(coeff) * scale; v = refpos - phase(coeff) * scale;
break; break;
case TRC_DELAY: case TRC_DELAY:
if (i == 0) { v = refpos - groupdelay_from_array(i, array) * scale;
float deltaf = frequencies[1] - frequencies[0];
v = refpos - groupdelay(array[0], array[1], deltaf) * scale;
} else if (i == 100) {
float deltaf = frequencies[i] - frequencies[i-1];
v = refpos - groupdelay(array[i-1], array[i], deltaf) * scale;
} else {
float deltaf = frequencies[i+1] - frequencies[i-1];
v = refpos - groupdelay(array[i-1], array[i+1], deltaf) * scale;
}
break; break;
case TRC_LINEAR: case TRC_LINEAR:
v = refpos + linear(coeff) * scale; v = refpos + linear(coeff) * scale;
@ -676,16 +681,7 @@ trace_get_value_string(int t, char *buf, int len, float array[101][2], int i)
chsnprintf(buf, len, "%.2f" S_DEGREE, v); chsnprintf(buf, len, "%.2f" S_DEGREE, v);
break; break;
case TRC_DELAY: case TRC_DELAY:
if (i == 0) { v = groupdelay_from_array(i, array);
float deltaf = frequencies[1] - frequencies[0];
v = groupdelay(array[0], array[1], deltaf);
} else if (i == 100) {
float deltaf = frequencies[i] - frequencies[i-1];
v = groupdelay(array[i-1], array[i], deltaf);
} else {
float deltaf = frequencies[i+1] - frequencies[i-1];
v = groupdelay(array[i-1], array[i+1], deltaf);
}
string_value_with_prefix(buf, len, v, 's'); string_value_with_prefix(buf, len, v, 's');
break; break;
case TRC_LINEAR: case TRC_LINEAR: