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take decibel values for notch and bandpass

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Ahmet Inan 2019-02-27 10:26:57 +01:00
commit d1f2e2f9f9
1 changed files with 5 additions and 4 deletions
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9
biquad.hh
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@ -7,6 +7,7 @@ Copyright 2019 Ahmet Inan <inan@aicodix.de>
#pragma once
#include "const.hh"
#include "decibel.hh"
#include "unit_circle.hh"
namespace DSP {
@ -53,9 +54,9 @@ public:
a1a0 = a1 / a0;
a2a0 = a2 / a0;
}
void notch(int n, int N, VALUE Q)
void notch(int n, int N, VALUE QdB)
{
VALUE alpha = UnitCircle<VALUE>::sin(n, N) / (VALUE(2) * Q),
VALUE alpha = UnitCircle<VALUE>::sin(n, N) / (VALUE(2) * idecibel(QdB)),
cn = UnitCircle<VALUE>::cos(n, N),
b0 = VALUE(1),
b1 = -VALUE(2) * cn,
@ -69,9 +70,9 @@ public:
a1a0 = a1 / a0;
a2a0 = a2 / a0;
}
void bandpass(int n, int N, VALUE Q)
void bandpass(int n, int N, VALUE QdB)
{
VALUE alpha = UnitCircle<VALUE>::sin(n, N) / (VALUE(2) * Q),
VALUE alpha = UnitCircle<VALUE>::sin(n, N) / (VALUE(2) * idecibel(QdB)),
cn = UnitCircle<VALUE>::cos(n, N),
b0 = alpha,
b1 = VALUE(0),