ZVAFilter Class Reference

The ZVAFilter object implements multpile Zavalishin VA Filters. Audio I/O: More...

#include <fxobjects.h>

Inheritance diagram for ZVAFilter:

Public Member Functions
virtual bool	reset (double _sampleRate)
ZVAFilterParameters	getParameters ()
void	setParameters (const ZVAFilterParameters &params)
virtual bool	canProcessAudioFrame ()
virtual double	processAudioSample (double xn)
void	calculateFilterCoeffs ()
void	setBeta (double _beta)
double	getBeta ()
Public Member Functions inherited from IAudioSignalProcessor
virtual bool	reset (double _sampleRate)=0
virtual double	processAudioSample (double xn)=0
virtual bool	canProcessAudioFrame ()=0
virtual void	setSampleRate (double _sampleRate)
virtual void	enableAuxInput (bool enableAuxInput)
virtual double	processAuxInputAudioSample (double xn)
virtual bool	processAudioFrame (const float *inputFrame, float *outputFrame, uint32_t inputChannels, uint32_t outputChannels)

Protected Attributes
ZVAFilterParameters	zvaFilterParameters
	object parameters
double	sampleRate = 44100.0
	current sample rate
double	integrator_z [2]
	state variables
double	alpha0 = 0.0
	input scalar, correct delay-free loop
double	alpha = 0.0
	alpha is (wcT/2)
double	rho = 0.0
	p = 2R + g (feedback)
double	beta = 0.0
	beta value, not used
double	analogMatchSigma = 0.0
	analog matching Sigma value (see book)

Detailed Description

The ZVAFilter object implements multpile Zavalishin VA Filters. Audio I/O:

• Processes mono input to mono output.

Control I/F:

• Use BiquadParameters structure to get/set object params.

Author

Will Pirkle http://www.willpirkle.com

Remarks

This object is included in Designing Audio Effects Plugins in C++ 2nd Ed. by Will Pirkle

Version

Revision : 1.0

Date

Date : 2018 / 09 / 7

Member Function Documentation

calculateFilterCoeffs()

void ZVAFilter::calculateFilterCoeffs ( )

inline

recalculate the filter coefficients

canProcessAudioFrame()

virtual bool ZVAFilter::canProcessAudioFrame ( )

inlinevirtual

return false: this object only processes samples

Implements IAudioSignalProcessor.

getBeta()

double ZVAFilter::getBeta ( )

inline

get beta value,not used in book projects; for future use

getParameters()

ZVAFilterParameters ZVAFilter::getParameters ( )

inline

get parameters: note use of custom structure for passing param data

Returns

ZVAFilterParameters custom data structure

processAudioSample()

virtual double ZVAFilter::processAudioSample ( double  xn )

inlinevirtual

process input x(n) through the VA filter to produce return value y(n)

Parameters

xn

input

Returns

the processed sample

Implements IAudioSignalProcessor.

reset()

virtual bool ZVAFilter::reset ( double  _sampleRate )

inlinevirtual

reset members to initialized state

Implements IAudioSignalProcessor.

setBeta()

void ZVAFilter::setBeta ( double  _beta )

inline

set beta value, for filters that aggregate 1st order VA sections

setParameters()

void ZVAFilter::setParameters ( const ZVAFilterParameters &  params )

inline

set parameters: note use of custom structure for passing param data

Parameters

ZVAFilterParameters

custom data structure

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The documentation for this class was generated from the following file:

• C:/RackAFX_v7/ASPIK_Doxygen/PluginObjects/fxobjects.h