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juce_NoiseGate.cpp
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
By using JUCE, you agree to the terms of both the JUCE 7 End-User License
Agreement and JUCE Privacy Policy.
End User License Agreement: www.juce.com/juce-7-licence
Privacy Policy: www.juce.com/juce-privacy-policy
Or: You may also use this code under the terms of the GPL v3 (see
www.gnu.org/licenses).
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce::dsp
{
//==============================================================================
template <typename SampleType>
NoiseGate<SampleType>::NoiseGate()
{
update();
RMSFilter.setLevelCalculationType (BallisticsFilterLevelCalculationType::RMS);
RMSFilter.setAttackTime (static_cast<SampleType> (0.0));
RMSFilter.setReleaseTime (static_cast<SampleType> (50.0));
}
template <typename SampleType>
void NoiseGate<SampleType>::setThreshold (SampleType newValue)
{
thresholddB = newValue;
update();
}
template <typename SampleType>
void NoiseGate<SampleType>::setRatio (SampleType newRatio)
{
jassert (newRatio >= static_cast<SampleType> (1.0));
ratio = newRatio;
update();
}
template <typename SampleType>
void NoiseGate<SampleType>::setAttack (SampleType newAttack)
{
attackTime = newAttack;
update();
}
template <typename SampleType>
void NoiseGate<SampleType>::setRelease (SampleType newRelease)
{
releaseTime = newRelease;
update();
}
//==============================================================================
template <typename SampleType>
void NoiseGate<SampleType>::prepare (const ProcessSpec& spec)
{
jassert (spec.sampleRate > 0);
jassert (spec.numChannels > 0);
sampleRate = spec.sampleRate;
RMSFilter.prepare (spec);
envelopeFilter.prepare (spec);
update();
reset();
}
template <typename SampleType>
void NoiseGate<SampleType>::reset()
{
RMSFilter.reset();
envelopeFilter.reset();
}
//==============================================================================
template <typename SampleType>
SampleType NoiseGate<SampleType>::processSample (int channel, SampleType sample)
{
// RMS ballistics filter
auto env = RMSFilter.processSample (channel, sample);
// Ballistics filter
env = envelopeFilter.processSample (channel, env);
// VCA
auto gain = (env > threshold) ? static_cast<SampleType> (1.0)
: std::pow (env * thresholdInverse, currentRatio - static_cast<SampleType> (1.0));
// Output
return gain * sample;
}
template <typename SampleType>
void NoiseGate<SampleType>::update()
{
threshold = Decibels::decibelsToGain (thresholddB, static_cast<SampleType> (-200.0));
thresholdInverse = static_cast<SampleType> (1.0) / threshold;
currentRatio = ratio;
envelopeFilter.setAttackTime (attackTime);
envelopeFilter.setReleaseTime (releaseTime);
}
//==============================================================================
template class NoiseGate<float>;
template class NoiseGate<double>;
} // namespace juce::dsp
juce::Decibels::decibelsToGain
static Type decibelsToGain(Type decibels, Type minusInfinityDb=Type(defaultMinusInfinitydB))
Definition juce_Decibels.h:42
juce::dsp::NoiseGate::prepare
void prepare(const ProcessSpec &spec)
Definition juce_NoiseGate.cpp:72
juce::dsp::NoiseGate::processSample
SampleType processSample(int channel, SampleType inputValue)
Definition juce_NoiseGate.cpp:95
juce::dsp::NoiseGate::setRelease
void setRelease(SampleType newRelease)
Definition juce_NoiseGate.cpp:64
juce::dsp::NoiseGate::setRatio
void setRatio(SampleType newRatio)
Definition juce_NoiseGate.cpp:48
juce::dsp::NoiseGate::setAttack
void setAttack(SampleType newAttack)
Definition juce_NoiseGate.cpp:57
juce::dsp::NoiseGate::setThreshold
void setThreshold(SampleType newThreshold)
Definition juce_NoiseGate.cpp:41
juce::dsp::NoiseGate::NoiseGate
NoiseGate()
Definition juce_NoiseGate.cpp:31
juce::dsp::NoiseGate::reset
void reset()
Definition juce_NoiseGate.cpp:87
juce::dsp::ProcessSpec
Definition juce_ProcessContext.h:36
juce::dsp::ProcessSpec::numChannels
uint32 numChannels
Definition juce_ProcessContext.h:44
juce::dsp::ProcessSpec::sampleRate
double sampleRate
Definition juce_ProcessContext.h:38