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Remove distortion from sv filters

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This commit is contained in:
Vesa
2014-12-07 21:11:11 +02:00
parent 6b7ff58886
commit e7b7cf54bb
1 changed files with 6 additions and 11 deletions
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17
include/BasicFilters.h
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@@ -289,7 +289,6 @@ public:
m_sampleRatio( 1.0f / m_sampleRate ),
m_subFilter( NULL )
{
m_svsr = 1.0f - expf( -4646.39874051f / m_sampleRate );
clearHistory();
}
@@ -326,7 +325,6 @@ public:
m_delay2[_chnl] = 0.0f;
m_delay3[_chnl] = 0.0f;
m_delay4[_chnl] = 0.0f;
m_sva[_chnl] = 0.0f;
}
}
@@ -409,7 +407,6 @@ public:
case Lowpass_SV:
case Bandpass_SV:
{
m_sva[_chnl] += ( qAbs( _in0 ) - m_sva[_chnl] ) * m_svsr;
float highpass;
for( int i = 0; i < 2; ++i ) // 2x oversample
@@ -425,14 +422,13 @@ public:
/* mix filter output into output buffer */
return m_type == Lowpass_SV
? atanf( 3.0f * m_delay4[_chnl] * m_sva[_chnl] )
: atanf( 3.0f * m_delay3[_chnl] * m_sva[_chnl] );
? m_delay4[_chnl]
: m_delay3[_chnl];
break;
}
case Highpass_SV:
{
m_sva[_chnl] += ( qAbs( _in0 ) - m_sva[_chnl] ) * m_svsr;
float hp;
for( int i = 0; i < 2; ++i ) // 2x oversample
@@ -442,13 +438,12 @@ public:
m_delay1[_chnl] = m_svf1 * hp + m_delay1[_chnl];
}
return atanf( 3.0f * hp * m_sva[_chnl] );
return hp;
break;
}
case Notch_SV:
{
m_sva[_chnl] += ( qAbs( _in0 ) - m_sva[_chnl] ) * m_svsr;
float hp1, hp2;
for( int i = 0; i < 2; ++i ) // 2x oversample
@@ -463,7 +458,7 @@ public:
}
/* mix filter output into output buffer */
return atanf( 1.5f * ( m_delay4[_chnl] + hp1 ) * m_sva[_chnl] );
return m_delay4[_chnl] + hp1;
break;
}
@@ -899,7 +894,7 @@ private:
float m_vfa[4], m_vfb[4], m_vfc[4], m_vfq;
// coeffs for Lowpass_SV (state-variant lowpass)
float m_svf1, m_svf2, m_svq, m_svsr;
float m_svf1, m_svf2, m_svq;
typedef sample_t frame[CHANNELS];
@@ -916,7 +911,7 @@ private:
frame m_vfbp[6], m_vfhp[6], m_vflast[6];
// in/out history for Lowpass_SV (state-variant lowpass)
frame m_delay1, m_delay2, m_delay3, m_delay4, m_sva;
frame m_delay1, m_delay2, m_delay3, m_delay4;
FilterTypes m_type;
bool m_doubleFilter;