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basic_filters - even more optimization

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Use more efficient interpolation, optimize some calculations
This commit is contained in:
Vesa
2014-06-26 13:15:20 +03:00
parent d6809b45c1
commit ba700399da
1 changed files with 7 additions and 8 deletions
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15
include/basic_filters.h
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@@ -39,6 +39,7 @@
#include "Mixer.h"
#include "templates.h"
#include "lmms_constants.h"
#include "interpolation.h"
//#include <iostream>
//#include <cstdlib>
@@ -498,21 +499,19 @@ public:
{ 320, 3200 },
{ 500, 1000 },
{ 320, 800 } };
static const float freqRatio = 4.0f / 14000.0f;
// Stretch Q/resonance
m_vfq = _q/4.f;
// frequency in lmms ranges from 1Hz to 14000Hz
const int vowel = (int)( floor( _freq/14000.f * 4.f ) );
const float fract = ( _freq/14000.f * 4.f ) -
(float)vowel;
const float vowelf = _freq * freqRatio;
const int vowel = static_cast<int>( vowelf );
const float fract = vowelf - vowel;
// interpolate between formant frequencies
const float f0 = _f[vowel+0][0] * ( 1.0f - fract ) +
_f[vowel+1][0] * ( fract );
const float f1 = _f[vowel+0][1] * ( 1.0f - fract ) +
_f[vowel+1][1] * ( fract );
const float f0 = linearInterpolate( _f[vowel+0][0], _f[vowel+1][0], fract );
const float f1 = linearInterpolate( _f[vowel+0][1], _f[vowel+1][1], fract );
m_vfa[0] = 1.0f - (1.0f/(m_sampleRate*4)) /
( (1.0f/(f0*2.0f*M_PI)) +