WDFTunableButterLPF3 Class Reference

The WDFTunableButterLPF3 object implements a tunable 3rd order Butterworth ladder filter. NOTE: designed with Elsie www.TonneSoftware.comm. More...

#include <fxobjects.h>

Inheritance diagram for WDFTunableButterLPF3:

Public Member Functions
virtual bool	reset (double _sampleRate)
virtual bool	canProcessAudioFrame ()
virtual double	processAudioSample (double xn)
void	createWDF ()
void	setUsePostWarping (bool b)
void	setFilterFc (double fc_Hz)
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
WdfSeriesAdaptor	seriesAdaptor_L1
	adaptor for L1
WdfParallelAdaptor	parallelAdaptor_C1
	adaptor for C1
WdfSeriesTerminatedAdaptor	seriesTerminatedAdaptor_L2
	adaptor for L2
double	L1_norm = 95.493
double	C1_norm = 530.516e-6
double	L2_norm = 95.493
bool	useFrequencyWarping = false
	flag for freq warping
double	sampleRate = 1.0
	stored sample rate

Detailed Description

The WDFTunableButterLPF3 object implements a tunable 3rd order Butterworth ladder filter. NOTE: designed with Elsie www.TonneSoftware.comm.

Audio I/O:

• Processes mono input to mono output.

Control I/F:

• setUsePostWarping(bool b) to enable/disable warping (see book)
• setFilterFc(double fc_Hz) to set the tunable fc value

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

canProcessAudioFrame()

virtual bool WDFTunableButterLPF3::canProcessAudioFrame ( )

inlinevirtual

return false: this object only processes samples

Implements IAudioSignalProcessor.

createWDF()

void WDFTunableButterLPF3::createWDF ( )

inline

create the filter structure; may be called more than once

processAudioSample()

virtual double WDFTunableButterLPF3::processAudioSample ( double  xn )

inlinevirtual

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

Parameters

xn

input

Returns

the processed sample

Implements IAudioSignalProcessor.

reset()

virtual bool WDFTunableButterLPF3::reset ( double  _sampleRate )

inlinevirtual

reset members to initialized state

Implements IAudioSignalProcessor.

setFilterFc()

void WDFTunableButterLPF3::setFilterFc ( double  fc_Hz )

inline

parameter setter for fc

setUsePostWarping()

void WDFTunableButterLPF3::setUsePostWarping ( bool  b )

inline

parameter setter for warping

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

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