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avfilter/af_acrossover: really fix single-pole allpass coefficients

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Now LR2, LR6, LR10, LR14 and LR18 have really flat sum.
This commit is contained in:
Paul B Mahol 2020-11-28 14:37:06 +01:00
parent ea8c05a3e7
commit 68adb68e96
1 changed files with 2 additions and 4 deletions
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libavfilter/af_acrossover.c
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@ -211,11 +211,9 @@ static void set_ap(BiquadContext *b, double fc, double q, double sr)
static void set_ap1(BiquadContext *b, double fc, double sr)
{
double omega = 0.5 * M_PI * fc / sr + M_PI_4;
double cosine = cos(omega);
double sine = sin(omega);
double omega = M_PI * fc / sr;
b->a1 = -cosine / sine;
b->a1 = exp(-omega);
b->a2 = 0.;
b->b0 = -b->a1;
b->b1 = 1.;