A first order filter class using the TPT (Topology-Preserving Transform) structure. More...
#include <juce_FirstOrderTPTFilter.h>
Public Types | |
using | Type = FirstOrderTPTFilterType |
Public Member Functions | |
FirstOrderTPTFilter () | |
Constructor. More... | |
SampleType | getCutoffFrequency () const noexcept |
Returns the cutoff frequency of the filter. More... | |
Type | getType () const noexcept |
Returns the type of the filter. More... | |
void | prepare (const ProcessSpec &spec) |
Initialises the filter. More... | |
template<typename ProcessContext > | |
void | process (const ProcessContext &context) noexcept |
Processes the input and output samples supplied in the processing context. More... | |
SampleType | processSample (int channel, SampleType inputValue) |
Processes one sample at a time on a given channel. More... | |
void | reset () |
Resets the internal state variables of the filter. More... | |
void | reset (SampleType newValue) |
Resets the internal state variables of the filter to a given value. More... | |
void | setCutoffFrequency (SampleType newFrequencyHz) |
Sets the cutoff frequency of the filter. More... | |
void | setType (Type newType) |
Sets the filter type. More... | |
void | snapToZero () noexcept |
Ensure that the state variables are rounded to zero if the state variables are denormals. More... | |
Private Member Functions | |
void | update () |
Private Attributes | |
SampleType | cutoffFrequency = 1000.0 |
Type | filterType = Type::lowpass |
SampleType | G = 0 |
std::vector< SampleType > | s1 { 2 } |
double | sampleRate = 44100.0 |
A first order filter class using the TPT (Topology-Preserving Transform) structure.
This filter can be modulated at high rates without producing audio artefacts. See Vadim Zavalishin's documentation about TPT structures for more information.
Note: Using this class prevents some loud audio artefacts commonly encountered when changing the cutoff frequency using of other filter simulation structures and IIR filter classes. However, this class may still require additional smoothing for cutoff frequency changes.
see StateVariableFilter, IIRFilter, SmoothedValue
@tags{DSP}
using juce::dsp::FirstOrderTPTFilter< SampleType >::Type = FirstOrderTPTFilterType |
juce::dsp::FirstOrderTPTFilter< SampleType >::FirstOrderTPTFilter | ( | ) |
Constructor.
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inlinenoexcept |
Returns the cutoff frequency of the filter.
References juce::dsp::FirstOrderTPTFilter< SampleType >::cutoffFrequency.
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inlinenoexcept |
Returns the type of the filter.
References juce::dsp::FirstOrderTPTFilter< SampleType >::filterType.
void juce::dsp::FirstOrderTPTFilter< SampleType >::prepare | ( | const ProcessSpec & | spec | ) |
Initialises the filter.
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inlinenoexcept |
Processes the input and output samples supplied in the processing context.
References jassert, juce::dsp::FirstOrderTPTFilter< SampleType >::processSample(), juce::dsp::FirstOrderTPTFilter< SampleType >::s1, and juce::dsp::FirstOrderTPTFilter< SampleType >::snapToZero().
SampleType juce::dsp::FirstOrderTPTFilter< SampleType >::processSample | ( | int | channel, |
SampleType | inputValue | ||
) |
Processes one sample at a time on a given channel.
Referenced by juce::dsp::FirstOrderTPTFilter< SampleType >::process().
void juce::dsp::FirstOrderTPTFilter< SampleType >::reset | ( | ) |
Resets the internal state variables of the filter.
void juce::dsp::FirstOrderTPTFilter< SampleType >::reset | ( | SampleType | newValue | ) |
Resets the internal state variables of the filter to a given value.
void juce::dsp::FirstOrderTPTFilter< SampleType >::setCutoffFrequency | ( | SampleType | newFrequencyHz | ) |
Sets the cutoff frequency of the filter.
newFrequencyHz | cutoff frequency in Hz. |
void juce::dsp::FirstOrderTPTFilter< SampleType >::setType | ( | Type | newType | ) |
Sets the filter type.
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noexcept |
Ensure that the state variables are rounded to zero if the state variables are denormals.
This is only needed if you are doing sample by sample processing.
Referenced by juce::dsp::FirstOrderTPTFilter< SampleType >::process().
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Referenced by juce::dsp::FirstOrderTPTFilter< SampleType >::getType().
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Referenced by juce::dsp::FirstOrderTPTFilter< SampleType >::process().
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