a-EQ: DSP bugfix
Previously there were large spurious spikes in the signal when the bandwidth parameter was adjusted on a pure sine tone for the peaking circuits. This has been *greatly* reduced if not eliminated by fixing a typo in two of the equations.
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@ -270,12 +270,12 @@ activate(LV2_Handle instance)
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static void linear_svf_set_peq(struct linear_svf *self, float gdb, float sample_rate, float cutoff, float bandwidth)
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{
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double f0 = (double)cutoff;
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double q = (double)pow(2.0, 1.0 / bandwidth) / (pow(2.0, bandwidth) - 1.0);
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double q = (double)pow(2.0, 0.5 * bandwidth) / (pow(2.0, bandwidth) - 1.0);
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double sr = (double)sample_rate;
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double A = pow(10.0, gdb/40.0);
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self->g = tan(M_PI * (f0 / sr));
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self->k = 1.0 / (q * A);
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self->k = 1.0 / q;
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self->a[0] = 1.0 / (1.0 + self->g * (self->g + self->k));
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self->a[1] = self->g * self->a[0];
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