1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
==============================================================================
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
|
