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add support for different filter types in biquad

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Navin K
2022-03-21 18:32:51 -04:00
parent 893ff3d954
commit 92d81d67c2
2 changed files with 123 additions and 0 deletions
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48
include/BiQuad.h
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@@ -74,6 +74,46 @@ public:
*/
void setNotch( StkFloat frequency, StkFloat radius );
//! Set the filter coefficients for a low-pass at \e frequency (in Hz) with factor \e Q.
/*!
This method determines the filter coefficients corresponding to
a low-pass filter with cutoff placed at \e frequency and
Q-factor set by \e Q. Both \e frequency and \e Q must be positive.
*/
void setLowPass( StkFloat frequency, StkFloat Q );
//! Set the filter coefficients for a high-pass at \e frequency (in Hz) with factor \e Q.
/*!
This method determines the filter coefficients corresponding to
a high-pass filter with cutoff placed at \e frequency and
Q-factor set by \e Q. Both \e frequency and \e Q must be positive.
*/
void setHighPass( StkFloat frequency, StkFloat Q );
//! Set the filter coefficients for a band-pass at \e frequency (in Hz) with factor \e Q.
/*!
This method determines the filter coefficients corresponding to
a band-pass filter with center placed at \e frequency and
Q-factor set by \e Q. Both \e frequency and \e Q must be positive.
*/
void setBandPass( StkFloat frequency, StkFloat Q );
//! Set the filter coefficients for a band-reject at \e frequency (in Hz) with factor \e Q.
/*!
This method determines the filter coefficients corresponding to
a band-reject filter with center placed at \e frequency and
Q-factor set by \e Q. Both \e frequency and \e Q must be positive.
*/
void setBandReject( StkFloat frequency, StkFloat Q );
//! Set the filter coefficients for an all-pass at \e frequency (in Hz) with factor \e Q.
/*!
This method determines the filter coefficients corresponding to
an all-pass filter with center placed at \e frequency and
Q-factor set by \e Q. Both \e frequency and \e Q must be positive.
*/
void setAllPass( StkFloat frequency, StkFloat Q );
//! Sets the filter zeroes for equal resonance gain.
/*!
When using the filter as a resonator, zeroes places at z = 1, z
@@ -114,6 +154,14 @@ public:
protected:
virtual void sampleRateChanged( StkFloat newRate, StkFloat oldRate );
// Helper function to update the three intermediate values for the predefined filter types
// along with the feedback filter coefficients. Performs the debug check for frequency and Q-factor arguments.
void setCommonFilterValues( StkFloat frequency, StkFloat Q );
StkFloat K_;
StkFloat kSqr_;
StkFloat denom_;
};
inline StkFloat BiQuad :: tick( StkFloat input )