A set of coefficients for use in an Filter object. More...

#include <juce_IIRFilter.h>

Inheritance diagram for IIR::Coefficients< NumericType >:

Collaboration diagram for IIR::Coefficients< NumericType >:

[legend]

Public Types
using	Ptr = ReferenceCountedObjectPtr< Coefficients >
	The Coefficients structure is ref-counted, so this is a handy type that can be used as a pointer to one. More...

Public Member Functions
	Coefficients ()
	Creates a null set of coefficients (which will produce silence). More...

	Coefficients (NumericType b0, NumericType b1, NumericType a0, NumericType a1)
	Directly constructs an object from the raw coefficients. More...

	Coefficients (NumericType b0, NumericType b1, NumericType b2, NumericType a0, NumericType a1, NumericType a2)

	Coefficients (NumericType b0, NumericType, NumericType b2, NumericType b3, NumericType a0, NumericType a1, NumericType a2, NumericType a3)

	Coefficients (const Coefficients &)
	Creates a copy of another filter. More...

void	decReferenceCount () noexcept
	Decreases the object's reference count. More...

bool	decReferenceCountWithoutDeleting () noexcept
	Decreases the object's reference count. More...

size_t	getFilterOrder () const noexcept
	Returns the filter order associated with the coefficients. More...

double	getMagnitudeForFrequency (double frequency, double sampleRate) const noexcept
	Returns the magnitude frequency response of the filter for a given frequency and sample rate. More...

void	getMagnitudeForFrequencyArray (const double frequencies, double magnitudes, size_t numSamples, double sampleRate) const noexcept
	Returns the magnitude frequency response of the filter for a given frequency array and sample rate. More...

double	getPhaseForFrequency (double frequency, double sampleRate) const noexcept
	Returns the phase frequency response of the filter for a given frequency and sample rate. More...

void	getPhaseForFrequencyArray (double frequencies, double phases, size_t numSamples, double sampleRate) const noexcept
	Returns the phase frequency response of the filter for a given frequency array and sample rate. More...

NumericType *	getRawCoefficients () noexcept
	Returns a raw data pointer to the coefficients. More...

const NumericType *	getRawCoefficients () const noexcept
	Returns a raw data pointer to the coefficients. More...

int	getReferenceCount () const noexcept
	Returns the object's current reference count. More...

void	incReferenceCount () noexcept
	Increments the object's reference count. More...

Coefficients &	operator= (const Coefficients &)
	Creates a copy of another filter. More...

Static Public Member Functions
static Ptr	makeAllPass (double sampleRate, NumericType frequency)
	Returns the coefficients for an all-pass filter. More...

static Ptr	makeAllPass (double sampleRate, NumericType frequency, NumericType Q)
	Returns the coefficients for an all-pass filter with variable Q. More...

static Ptr	makeBandPass (double sampleRate, NumericType frequency)
	Returns the coefficients for a band-pass filter. More...

static Ptr	makeBandPass (double sampleRate, NumericType frequency, NumericType Q)
	Returns the coefficients for a band-pass filter with variable Q. More...

static Ptr	makeFirstOrderAllPass (double sampleRate, NumericType frequency)
	Returns the coefficients for a first order all-pass filter. More...

static Ptr	makeFirstOrderHighPass (double sampleRate, NumericType frequency)
	Returns the coefficients for a first order high-pass filter. More...

static Ptr	makeFirstOrderLowPass (double sampleRate, NumericType frequency)
	Returns the coefficients for a first order low-pass filter. More...

static Ptr	makeHighPass (double sampleRate, NumericType frequency)
	Returns the coefficients for a high-pass filter. More...

static Ptr	makeHighPass (double sampleRate, NumericType frequency, NumericType Q)
	Returns the coefficients for a high-pass filter with variable Q. More...

static Ptr	makeHighShelf (double sampleRate, NumericType cutOffFrequency, NumericType Q, NumericType gainFactor)
	Returns the coefficients for a high-pass shelf filter with variable Q and gain. More...

static Ptr	makeLowPass (double sampleRate, NumericType frequency)
	Returns the coefficients for a low-pass filter. More...

static Ptr	makeLowPass (double sampleRate, NumericType frequency, NumericType Q)
	Returns the coefficients for a low-pass filter with variable Q. More...

static Ptr	makeLowShelf (double sampleRate, NumericType cutOffFrequency, NumericType Q, NumericType gainFactor)
	Returns the coefficients for a low-pass shelf filter with variable Q and gain. More...

static Ptr	makeNotch (double sampleRate, NumericType frequency)
	Returns the coefficients for a notch filter. More...

static Ptr	makeNotch (double sampleRate, NumericType frequency, NumericType Q)
	Returns the coefficients for a notch filter with variable Q. More...

static Ptr	makePeakFilter (double sampleRate, NumericType centreFrequency, NumericType Q, NumericType gainFactor)
	Returns the coefficients for a peak filter centred around a given frequency, with a variable Q and gain. More...

Public Attributes
Array< NumericType >	coefficients
	The raw coefficients. More...

Protected Member Functions
void	resetReferenceCount () noexcept
	Resets the reference count to zero without deleting the object. More...

Static Private Attributes
static constexpr NumericType	inverseRootTwo = static_cast<NumericType> (0.70710678118654752440L)

Detailed Description

template<typename NumericType>
struct IIR::Coefficients< NumericType >

A set of coefficients for use in an Filter object.

See also: IIR::Filter

Member Typedef Documentation

◆ Ptr

template<typename NumericType>

using IIR::Coefficients< NumericType >::Ptr = ReferenceCountedObjectPtr<Coefficients>

The Coefficients structure is ref-counted, so this is a handy type that can be used as a pointer to one.

Constructor & Destructor Documentation

◆ Coefficients() [1/5]

template<typename NumericType>

IIR::Coefficients< NumericType >::Coefficients ( )

Creates a null set of coefficients (which will produce silence).

◆ Coefficients() [2/5]

template<typename NumericType>

IIR::Coefficients< NumericType >::Coefficients	(	NumericType	b0,
		NumericType	b1,
		NumericType	a0,
		NumericType	a1
	)

Directly constructs an object from the raw coefficients.

Most people will want to use the static methods instead of this, but the constructor is public to allow tinkerers to create their own custom filters!

◆ Coefficients() [3/5]

template<typename NumericType>

IIR::Coefficients< NumericType >::Coefficients	(	NumericType	b0,
		NumericType	b1,
		NumericType	b2,
		NumericType	a0,
		NumericType	a1,
		NumericType	a2
	)

◆ Coefficients() [4/5]

template<typename NumericType>

IIR::Coefficients< NumericType >::Coefficients	(	NumericType	b0,
		NumericType	,
		NumericType	b2,
		NumericType	b3,
		NumericType	a0,
		NumericType	a1,
		NumericType	a2,
		NumericType	a3
	)

◆ Coefficients() [5/5]

template<typename NumericType>

IIR::Coefficients< NumericType >::Coefficients ( const Coefficients< NumericType > & )

Creates a copy of another filter.

Member Function Documentation

◆ decReferenceCount()

void ReferenceCountedObject::decReferenceCount ( )

inlinenoexceptinherited

Decreases the object's reference count.

If the count gets to zero, the object will be deleted.

References jassert.

◆ decReferenceCountWithoutDeleting()

bool ReferenceCountedObject::decReferenceCountWithoutDeleting ( )

inlinenoexceptinherited

Decreases the object's reference count.

If the count gets to zero, the object will not be deleted, but this method will return true, allowing the caller to take care of deletion.

References jassert.

◆ getFilterOrder()

template<typename NumericType>

size_t IIR::Coefficients< NumericType >::getFilterOrder ( ) const

noexcept

Returns the filter order associated with the coefficients.

◆ getMagnitudeForFrequency()

template<typename NumericType>

double IIR::Coefficients< NumericType >::getMagnitudeForFrequency	(	double	frequency,
		double	sampleRate
	)		const

noexcept

Returns the magnitude frequency response of the filter for a given frequency and sample rate.

◆ getMagnitudeForFrequencyArray()

template<typename NumericType>

void IIR::Coefficients< NumericType >::getMagnitudeForFrequencyArray	(	const double *	frequencies,
		double *	magnitudes,
		size_t	numSamples,
		double	sampleRate
	)		const

noexcept

Returns the magnitude frequency response of the filter for a given frequency array and sample rate.

◆ getPhaseForFrequency()

template<typename NumericType>

double IIR::Coefficients< NumericType >::getPhaseForFrequency	(	double	frequency,
		double	sampleRate
	)		const

noexcept

Returns the phase frequency response of the filter for a given frequency and sample rate.

◆ getPhaseForFrequencyArray()

template<typename NumericType>

void IIR::Coefficients< NumericType >::getPhaseForFrequencyArray	(	double *	frequencies,
		double *	phases,
		size_t	numSamples,
		double	sampleRate
	)		const

noexcept

Returns the phase frequency response of the filter for a given frequency array and sample rate.

◆ getRawCoefficients() [1/2]

template<typename NumericType>

NumericType* IIR::Coefficients< NumericType >::getRawCoefficients ( )

inlinenoexcept

Returns a raw data pointer to the coefficients.

References IIR::Filter< SampleType >::coefficients.

◆ getRawCoefficients() [2/2]

template<typename NumericType>

const NumericType* IIR::Coefficients< NumericType >::getRawCoefficients ( ) const

inlinenoexcept

Returns a raw data pointer to the coefficients.

References IIR::Filter< SampleType >::coefficients.

◆ getReferenceCount()

int ReferenceCountedObject::getReferenceCount ( ) const

inlinenoexceptinherited

Returns the object's current reference count.

◆ incReferenceCount()

void ReferenceCountedObject::incReferenceCount ( )

inlinenoexceptinherited

Increments the object's reference count.

This is done automatically by the smart pointer, but is public just in case it's needed for nefarious purposes.

◆ makeAllPass() [1/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeAllPass	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for an all-pass filter.

◆ makeAllPass() [2/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeAllPass	(	double	sampleRate,
		NumericType	frequency,
		NumericType	Q
	)

static

Returns the coefficients for an all-pass filter with variable Q.

◆ makeBandPass() [1/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeBandPass	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for a band-pass filter.

◆ makeBandPass() [2/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeBandPass	(	double	sampleRate,
		NumericType	frequency,
		NumericType	Q
	)

static

Returns the coefficients for a band-pass filter with variable Q.

◆ makeFirstOrderAllPass()

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeFirstOrderAllPass	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for a first order all-pass filter.

◆ makeFirstOrderHighPass()

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeFirstOrderHighPass	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for a first order high-pass filter.

◆ makeFirstOrderLowPass()

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeFirstOrderLowPass	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for a first order low-pass filter.

◆ makeHighPass() [1/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeHighPass	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for a high-pass filter.

◆ makeHighPass() [2/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeHighPass	(	double	sampleRate,
		NumericType	frequency,
		NumericType	Q
	)

static

Returns the coefficients for a high-pass filter with variable Q.

◆ makeHighShelf()

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeHighShelf	(	double	sampleRate,
		NumericType	cutOffFrequency,
		NumericType	Q,
		NumericType	gainFactor
	)

static

Returns the coefficients for a high-pass shelf filter with variable Q and gain.

The gain is a scale factor that the high frequencies are multiplied by, so values greater than 1.0 will boost the high frequencies, values less than 1.0 will attenuate them.

◆ makeLowPass() [1/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeLowPass	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for a low-pass filter.

◆ makeLowPass() [2/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeLowPass	(	double	sampleRate,
		NumericType	frequency,
		NumericType	Q
	)

static

Returns the coefficients for a low-pass filter with variable Q.

◆ makeLowShelf()

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeLowShelf	(	double	sampleRate,
		NumericType	cutOffFrequency,
		NumericType	Q,
		NumericType	gainFactor
	)

static

Returns the coefficients for a low-pass shelf filter with variable Q and gain.

The gain is a scale factor that the low frequencies are multiplied by, so values greater than 1.0 will boost the low frequencies, values less than 1.0 will attenuate them.

◆ makeNotch() [1/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeNotch	(	double	sampleRate,
		NumericType	frequency
	)

static

Returns the coefficients for a notch filter.

◆ makeNotch() [2/2]

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makeNotch	(	double	sampleRate,
		NumericType	frequency,
		NumericType	Q
	)

static

Returns the coefficients for a notch filter with variable Q.

◆ makePeakFilter()

template<typename NumericType>

static Ptr IIR::Coefficients< NumericType >::makePeakFilter	(	double	sampleRate,
		NumericType	centreFrequency,
		NumericType	Q,
		NumericType	gainFactor
	)

static

Returns the coefficients for a peak filter centred around a given frequency, with a variable Q and gain.

The gain is a scale factor that the centre frequencies are multiplied by, so values greater than 1.0 will boost the centre frequencies, values less than 1.0 will attenuate them.

◆ operator=()

template<typename NumericType>

Coefficients& IIR::Coefficients< NumericType >::operator= ( const Coefficients< NumericType > & )

Creates a copy of another filter.

◆ resetReferenceCount()

void ReferenceCountedObject::resetReferenceCount ( )

inlineprotectednoexceptinherited

Resets the reference count to zero without deleting the object.

You should probably never need to use this!

Member Data Documentation

◆ coefficients

template<typename NumericType>

Array<NumericType> IIR::Coefficients< NumericType >::coefficients

The raw coefficients.

You should leave these numbers alone unless you really know what you're doing.

◆ inverseRootTwo

template<typename NumericType>

constexpr NumericType IIR::Coefficients< NumericType >::inverseRootTwo = static_cast<NumericType> (0.70710678118654752440L)

staticprivate

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

juce_dsp/processors/juce_IIRFilter.h

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Static Private Attributes

Detailed Description

template<typename NumericType> struct IIR::Coefficients< NumericType >

Member Typedef Documentation

◆ Ptr

Constructor & Destructor Documentation

◆ Coefficients() [1/5]

◆ Coefficients() [2/5]

◆ Coefficients() [3/5]

◆ Coefficients() [4/5]

◆ Coefficients() [5/5]

Member Function Documentation

◆ decReferenceCount()

◆ decReferenceCountWithoutDeleting()

◆ getFilterOrder()

◆ getMagnitudeForFrequency()

◆ getMagnitudeForFrequencyArray()

◆ getPhaseForFrequency()

◆ getPhaseForFrequencyArray()

◆ getRawCoefficients() [1/2]

◆ getRawCoefficients() [2/2]

◆ getReferenceCount()

◆ incReferenceCount()

◆ makeAllPass() [1/2]

◆ makeAllPass() [2/2]

◆ makeBandPass() [1/2]

◆ makeBandPass() [2/2]

◆ makeFirstOrderAllPass()

◆ makeFirstOrderHighPass()

◆ makeFirstOrderLowPass()

◆ makeHighPass() [1/2]

◆ makeHighPass() [2/2]

◆ makeHighShelf()

◆ makeLowPass() [1/2]

◆ makeLowPass() [2/2]

◆ makeLowShelf()

◆ makeNotch() [1/2]

◆ makeNotch() [2/2]

◆ makePeakFilter()

◆ operator=()

◆ resetReferenceCount()

Member Data Documentation

◆ coefficients

◆ inverseRootTwo

template<typename NumericType>
struct IIR::Coefficients< NumericType >