OpenShot Audio Library | OpenShotAudio 0.4.0
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#include <juce_StateVariableTPTFilter.h>
Public Types | |
using | Type = StateVariableTPTFilterType |
Public Member Functions | |
StateVariableTPTFilter () | |
void | setType (Type newType) |
void | setCutoffFrequency (SampleType newFrequencyHz) |
void | setResonance (SampleType newResonance) |
Type | getType () const noexcept |
SampleType | getCutoffFrequency () const noexcept |
SampleType | getResonance () const noexcept |
void | prepare (const ProcessSpec &spec) |
void | reset () |
void | reset (SampleType newValue) |
void | snapToZero () noexcept |
template<typename ProcessContext > | |
void | process (const ProcessContext &context) noexcept |
SampleType | processSample (int channel, SampleType inputValue) |
An IIR filter that can perform low, band and high-pass filtering on an audio signal, with 12 dB of attenuation per octave, using a TPT structure, designed for fast modulation (see Vadim Zavalishin's documentation about TPT structures for more information). Its behaviour is based on the analog state variable filter circuit.
Note: The bandpass here is not the one in the RBJ CookBook as its gain can be higher than 0 dB. For the classic 0 dB bandpass, we need to multiply the result by R2.
Note 2: Using this class prevents some loud audio artefacts commonly encountered when changing the cutoff frequency using other filter simulation structures and IIR filter classes. However, this class may still require additional smoothing for cutoff frequency changes.
see IIRFilter, SmoothedValue
Definition at line 57 of file juce_StateVariableTPTFilter.h.
using juce::dsp::StateVariableTPTFilter< SampleType >::Type = StateVariableTPTFilterType |
Definition at line 61 of file juce_StateVariableTPTFilter.h.
juce::dsp::StateVariableTPTFilter< SampleType >::StateVariableTPTFilter |
Constructor.
Definition at line 31 of file juce_StateVariableTPTFilter.cpp.
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inlinenoexcept |
Returns the cutoff frequency of the filter.
Definition at line 90 of file juce_StateVariableTPTFilter.h.
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inlinenoexcept |
Returns the resonance of the filter.
Definition at line 93 of file juce_StateVariableTPTFilter.h.
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inlinenoexcept |
Returns the type of the filter.
Definition at line 87 of file juce_StateVariableTPTFilter.h.
void juce::dsp::StateVariableTPTFilter< SampleType >::prepare | ( | const ProcessSpec & | spec | ) |
Initialises the filter.
Definition at line 62 of file juce_StateVariableTPTFilter.cpp.
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inlinenoexcept |
Processes the input and output samples supplied in the processing context.
Definition at line 114 of file juce_StateVariableTPTFilter.h.
SampleType juce::dsp::StateVariableTPTFilter< SampleType >::processSample | ( | int | channel, |
SampleType | inputValue | ||
) |
Processes one sample at a time on a given channel.
Definition at line 99 of file juce_StateVariableTPTFilter.cpp.
Referenced by juce::dsp::StateVariableTPTFilter< SampleType >::process().
void juce::dsp::StateVariableTPTFilter< SampleType >::reset |
Resets the internal state variables of the filter.
Definition at line 77 of file juce_StateVariableTPTFilter.cpp.
void juce::dsp::StateVariableTPTFilter< SampleType >::reset | ( | SampleType | newValue | ) |
Resets the internal state variables of the filter to a given value.
Definition at line 83 of file juce_StateVariableTPTFilter.cpp.
void juce::dsp::StateVariableTPTFilter< SampleType >::setCutoffFrequency | ( | SampleType | newFrequencyHz | ) |
Sets the cutoff frequency of the filter.
newFrequencyHz | the new cutoff frequency in Hz. |
Definition at line 43 of file juce_StateVariableTPTFilter.cpp.
void juce::dsp::StateVariableTPTFilter< SampleType >::setResonance | ( | SampleType | newResonance | ) |
Sets the resonance of the 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).
Definition at line 52 of file juce_StateVariableTPTFilter.cpp.
void juce::dsp::StateVariableTPTFilter< SampleType >::setType | ( | Type | newType | ) |
Sets the filter type.
Definition at line 37 of file juce_StateVariableTPTFilter.cpp.
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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.
Definition at line 90 of file juce_StateVariableTPTFilter.cpp.
Referenced by juce::dsp::StateVariableTPTFilter< SampleType >::process().