ADSR Class Reference

Linear ADSR envelope generator optimized for modulation sources. More...

#include <gin_adsr.h>

Public Types
enum	State {   idle , attack , decay , sustain ,   release , finished }

Public Member Functions
	ADSR ()
	~ADSR ()
void	setSampleRate (double sr)
float	process ()
float	process (int num)
void	process (juce::AudioSampleBuffer &buffer)
void	process (juce::AudioSampleBuffer &buffer, int startSample, int numSamples)
float	getOutput ()
std::pair< int, float >	getCurrentPhase ()
State	getState ()
void	noteOn ()
void	noteOff ()
void	setAttack (float seconds)
void	setDecay (float seconds)
void	setRelease (float seconds)
void	setSustainLevel (float level)
void	reset ()

Protected Attributes
State	state = idle
double	sampleRate = 44100.0
float	output = 0.0f
float	attackDelta = 0.0f
float	decayDelta = 0.0f
float	releaseDelta = 0.0f
float	sustainLevel = 0.0f

Detailed Description

Linear ADSR envelope generator optimized for modulation sources.

ADSR provides a simple, linear envelope generator with attack, decay, sustain, and release stages. Unlike AnalogADSR which uses exponential curves for audio, this class uses linear ramps making it ideal for modulation sources (LFO depth, filter cutoff, etc.) where linear response is often preferred.

Key Features:

• Linear attack, decay, and release stages
• Constant sustain level while note is held
• Per-sample or block processing
• State tracking for envelope phase
• Can fill buffer with envelope values

Envelope Stages:

• Attack: Linear rise from 0 to 1
• Decay: Linear fall from 1 to sustain level
• Sustain: Held at sustain level while note is on
• Release: Linear fall from current level to 0

Usage:

ADSR envelope;
envelope.setSampleRate(44100.0);
envelope.setAttack(0.01f);       // 10ms attack
envelope.setDecay(0.1f);         // 100ms decay
envelope.setSustainLevel(0.7f);  // 70% sustain
envelope.setRelease(0.5f);       // 500ms release
 
envelope.noteOn();
float modValue = envelope.process(blockSize);
// ... later ...
envelope.noteOff();

See also

AnalogADSR

Member Enumeration Documentation

State

enum ADSR::State

Enumerator
idle
attack
decay
sustain
release
finished

Constructor & Destructor Documentation

ADSR()

ADSR::ADSR

(

)

~ADSR()

ADSR::~ADSR

(

)

Member Function Documentation

setSampleRate()

void ADSR::setSampleRate

(

double

sr

)

References sampleRate.

process() [1/4]

float ADSR::process

(

)

process() [2/4]

float ADSR::process

(

int

num

)

process() [3/4]

void ADSR::process

(

juce::AudioSampleBuffer &

buffer

)

process() [4/4]

void ADSR::process	(	juce::AudioSampleBuffer &	buffer,
		int	startSample,
		int	numSamples
	)

getOutput()

float ADSR::getOutput

(

)

References attackDelta, idle, output, and state.

getCurrentPhase()

std::pair< int, float > ADSR::getCurrentPhase

(

)

References attack, decay, output, release, state, and sustain.

getState()

State ADSR::getState

(

)

References state.

noteOn()

void ADSR::noteOn

(

)

References attack, and state.

noteOff()

void ADSR::noteOff

(

)

References release, and state.

setAttack()

void ADSR::setAttack

(

float

seconds

)

setDecay()

void ADSR::setDecay

(

float

seconds

)

setRelease()

void ADSR::setRelease

(

float

seconds

)

setSustainLevel()

void ADSR::setSustainLevel

(

float

level

)

reset()

void ADSR::reset

(

)

Member Data Documentation

state

State ADSR::state = idle

protected

Referenced by getCurrentPhase(), getOutput(), getState(), noteOff(), and noteOn().

sampleRate

double ADSR::sampleRate = 44100.0

protected

Referenced by setSampleRate().

output

float ADSR::output = 0.0f

protected

Referenced by getCurrentPhase(), and getOutput().

attackDelta

float ADSR::attackDelta = 0.0f

protected

Referenced by getOutput().

decayDelta

float ADSR::decayDelta = 0.0f

protected

releaseDelta

float ADSR::releaseDelta = 0.0f

protected

sustainLevel

float ADSR::sustainLevel = 0.0f

protected

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

• gin_adsr.h