FastConvolver Class Reference

The FastConvolver provides a fast convolver - the user supplies the filter IR and the object snapshots the FFT of that filter IR. Input audio is fast-convovled with the filter FFT using complex multiplication and zero-padding. More...

#include <fxobjects.h>

Public Member Functions
void	initialize (unsigned int _filterImpulseLength)
void	setFilterIR (double *irBuffer)
double	processAudioSample (double input)
unsigned int	getFrameLength ()
unsigned int	getFilterIRLength ()

Protected Attributes
PhaseVocoder	vocoder
	vocoder object
FastFFT	filterFastFFT
	FastFFT object.
fftw_complex *	filterFFT = nullptr
	filterFFT output arrays
double *	filterIR = nullptr
	filter IR
unsigned int	inputCount = 0
	input sample counter
unsigned int	filterImpulseLength = 0
	IR length.

Detailed Description

The FastConvolver provides a fast convolver - the user supplies the filter IR and the object snapshots the FFT of that filter IR. Input audio is fast-convovled with the filter FFT using complex multiplication and zero-padding.

Audio I/O:

• processes mono input into mono output.

Control I/F:

• none.

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

getFilterIRLength()

unsigned int FastConvolver::getFilterIRLength ( )

inline

get current IR length

getFrameLength()

unsigned int FastConvolver::getFrameLength ( )

inline

get current frame length

initialize()

void FastConvolver::initialize ( unsigned int  _filterImpulseLength )

inline

setup the FFT for a given IR length

Parameters

_filterImpulseLength

the filter IR length, which is 1/2 FFT length due to need for zero-padding (see FX book)

processAudioSample()

double FastConvolver::processAudioSample ( double  input )

inline

process an input sample through convolver

setFilterIR()

void FastConvolver::setFilterIR ( double *  irBuffer )

inline

setup the filter IRirBuffer MUST be exactly filterImpulseLength in size, or this will crash!

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

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