dsp::FIR::Filter< SampleType > Class Template Reference

A processing class that can perform FIR filtering on an audio signal, in the time domain. More...

#include <juce_FIRFilter.h>

Public Types
using	NumericType = typename SampleTypeHelpers::ElementType<SampleType>::Type
	The NumericType is the underlying primitive type used by the SampleType (which could be either a primitive or vector)
using	CoefficientsPtr = typename Coefficients<NumericType>::Ptr
	A typedef for a ref-counted pointer to the coefficients object.

Public Member Functions
	Filter ()
	This will create a filter which will produce silence.
	Filter (CoefficientsPtr coefficientsToUse)
	Creates a filter with a given set of coefficients.
	Filter (const Filter &)=default
	Filter (Filter &&)=default
Filter &	operator= (const Filter &)=default
Filter &	operator= (Filter &&)=default
void	prepare (const ProcessSpec &spec) noexcept
	Prepare this filter for processing.
void	reset ()
	Resets the filter's processing pipeline, ready to start a new stream of data.
template<typename ProcessContext >
void	process (const ProcessContext &context) noexcept
	Processes a block of samples.
SampleType JUCE_VECTOR_CALLTYPE	processSample (SampleType sample) noexcept
	Processes a single sample, without any locking.

Public Attributes
Coefficients< NumericType >::Ptr	coefficients
	The coefficients of the FIR filter.

Detailed Description

template<typename SampleType>
class dsp::FIR::Filter< SampleType >

A processing class that can perform FIR filtering on an audio signal, in the time domain.

Using FIRFilter is fast enough for FIRCoefficients with a size lower than 128 samples. For longer filters, it might be more efficient to use the class Convolution instead, which does the same processing in the frequency domain thanks to FFT.

See also

FIRFilter::Coefficients, Convolution, FFT

Member Typedef Documentation

NumericType

template<typename SampleType >

using dsp::FIR::Filter< SampleType >::NumericType = typename SampleTypeHelpers::ElementType<SampleType>::Type

The NumericType is the underlying primitive type used by the SampleType (which could be either a primitive or vector)

CoefficientsPtr

template<typename SampleType >

using dsp::FIR::Filter< SampleType >::CoefficientsPtr = typename Coefficients<NumericType>::Ptr

A typedef for a ref-counted pointer to the coefficients object.

Constructor & Destructor Documentation

Filter() [1/4]

template<typename SampleType >

dsp::FIR::Filter< SampleType >::Filter

(

)

This will create a filter which will produce silence.

References dsp::FIR::Filter< SampleType >::reset().

Filter() [2/4]

template<typename SampleType >

dsp::FIR::Filter< SampleType >::Filter

(

CoefficientsPtr

coefficientsToUse

)

Creates a filter with a given set of coefficients.

References dsp::FIR::Filter< SampleType >::reset().

Filter() [3/4]

template<typename SampleType >

dsp::FIR::Filter< SampleType >::Filter ( const Filter< SampleType > & )

default

Filter() [4/4]

template<typename SampleType >

dsp::FIR::Filter< SampleType >::Filter ( Filter< SampleType > && )

default

Member Function Documentation

operator=() [1/2]

template<typename SampleType >

Filter & dsp::FIR::Filter< SampleType >::operator= ( const Filter< SampleType > & )

default

operator=() [2/2]

template<typename SampleType >

Filter & dsp::FIR::Filter< SampleType >::operator= ( Filter< SampleType > && )

default

prepare()

template<typename SampleType >

void dsp::FIR::Filter< SampleType >::prepare ( const ProcessSpec & spec )

noexcept

Prepare this filter for processing.

References jassert, and dsp::FIR::Filter< SampleType >::reset().

reset()

template<typename SampleType >

void dsp::FIR::Filter< SampleType >::reset

(

)

Resets the filter's processing pipeline, ready to start a new stream of data.

Note that this clears the processing state, but the type of filter and its coefficients aren't changed. To disable the filter, call setEnabled (false).

References dsp::FIR::Filter< SampleType >::coefficients, HeapBlock< ElementType, throwOnFailure >::getData(), jmax(), HeapBlock< ElementType, throwOnFailure >::malloc(), and snapPointerToAlignment().

Referenced by dsp::FIR::Filter< SampleType >::Filter(), dsp::FIR::Filter< SampleType >::Filter(), and dsp::FIR::Filter< SampleType >::prepare().

process()

template<typename SampleType >

template<typename ProcessContext >

void dsp::FIR::Filter< SampleType >::process ( const ProcessContext & context )

noexcept

Processes a block of samples.

References dsp::FIR::Filter< SampleType >::coefficients, and jassert.

processSample()

template<typename SampleType >

SampleType JUCE_VECTOR_CALLTYPE dsp::FIR::Filter< SampleType >::processSample ( SampleType sample )

noexcept

Processes a single sample, without any locking.

Use this if you need processing of a single value.

References dsp::FIR::Filter< SampleType >::coefficients.

Member Data Documentation

coefficients

template<typename SampleType >

Coefficients<NumericType>::Ptr dsp::FIR::Filter< SampleType >::coefficients

The coefficients of the FIR filter.

It's up to the caller to ensure that these coefficients are modified in a thread-safe way.

If you change the order of the coefficients then you must call reset after modifying them.

Referenced by dsp::FIR::Filter< SampleType >::process(), dsp::FIR::Filter< SampleType >::processSample(), and dsp::FIR::Filter< SampleType >::reset().

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

• juce_FIRFilter.h