Structure used for the state variable filter parameters. More...

Inheritance diagram for dsp::StateVariableFilter::Parameters< NumericType >:

Public Types
enum	Type { Type::lowPass, Type::bandPass, Type::highPass }

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

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

Public Member Functions
void	setCutOffFrequency (double sampleRate, NumericType frequency, NumericType resonance=static_cast< NumericType >(1.0/MathConstants< double >::sqrt2)) noexcept
	Sets the cutoff frequency and resonance of the IIR filter. More...

	Parameters ()=default

	Parameters (const Parameters &o)

Parameters &	operator= (const Parameters &o) noexcept

Public Member Functions inherited from ReferenceCountedObject
void	incReferenceCount () noexcept
	Increments the object's reference count. More...

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

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

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

Public Attributes
Type	type = Type::lowPass
	The type of the IIR filter. More...

NumericType	g = static_cast<NumericType> (std::tan (MathConstants<double>::pi * 200.0 / 44100.0))

NumericType	R2 = static_cast<NumericType> (MathConstants<double>::sqrt2)

NumericType	h = static_cast<NumericType> (1.0 / (1.0 + R2 * g + g * g))

Additional Inherited Members
Protected Member Functions inherited from ReferenceCountedObject
	ReferenceCountedObject ()=default
	Creates the reference-counted object (with an initial ref count of zero). More...

	ReferenceCountedObject (const ReferenceCountedObject &) noexcept
	Copying from another object does not affect this one's reference-count. More...

	ReferenceCountedObject (ReferenceCountedObject &&) noexcept
	Copying from another object does not affect this one's reference-count. More...

ReferenceCountedObject &	operator= (const ReferenceCountedObject &) noexcept
	Copying from another object does not affect this one's reference-count. More...

ReferenceCountedObject &	operator= (ReferenceCountedObject &&) noexcept
	Copying from another object does not affect this one's reference-count. More...

virtual	~ReferenceCountedObject ()
	Destructor. More...

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

Detailed Description

template<typename NumericType>
struct dsp::StateVariableFilter::Parameters< NumericType >

Structure used for the state variable filter parameters.

Member Typedef Documentation

◆ Ptr

template<typename NumericType>

using dsp::StateVariableFilter::Parameters< NumericType >::Ptr = ReferenceCountedObjectPtr<Parameters>

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

Member Enumeration Documentation

◆ Type

template<typename NumericType>

enum dsp::StateVariableFilter::Parameters::Type

strong

Enumerator
lowPass
bandPass
highPass

Constructor & Destructor Documentation

◆ Parameters() [1/2]

template<typename NumericType>

dsp::StateVariableFilter::Parameters< NumericType >::Parameters ( )

default

◆ Parameters() [2/2]

template<typename NumericType>

dsp::StateVariableFilter::Parameters< NumericType >::Parameters ( const Parameters< NumericType > & o )

Member Function Documentation

◆ setCutOffFrequency()

template<typename NumericType>

void dsp::StateVariableFilter::Parameters< NumericType >::setCutOffFrequency	(	double	sampleRate,
		NumericType	frequency,
		NumericType	resonance = `static_cast<NumericType> (1.0 / MathConstants<double>::sqrt2)`
	)

noexcept

Sets the cutoff frequency and resonance of the IIR filter.

Note: The bandwidth of the resonance increases with the value of the parameter. To have a standard 12 dB/octave filter, the value must be set at 1 / sqrt(2).

References jassert, and Colours::tan.

◆ operator=()

template<typename NumericType>

Parameters& dsp::StateVariableFilter::Parameters< NumericType >::operator= ( const Parameters< NumericType > & o )

noexcept

References dsp::StateVariableFilter::Parameters< NumericType >::g.

Member Data Documentation

◆ type

template<typename NumericType>

Type dsp::StateVariableFilter::Parameters< NumericType >::type = Type::lowPass

The type of the IIR filter.

◆ g

template<typename NumericType>

NumericType dsp::StateVariableFilter::Parameters< NumericType >::g = static_cast<NumericType> (std::tan (MathConstants<double>::pi * 200.0 / 44100.0))

Referenced by dsp::StateVariableFilter::Parameters< NumericType >::operator=(), and dsp::StateVariableFilter::Filter< SampleType >::processSample().