dsp

Namespaces
namespace	Distortion
	Distortion.

Classes
class	ADSR
	Linear ADSR envelope generator optimized for modulation sources. More...
class	AnalogADSR
	Analog-modeled ADSR envelope generator for smooth, musical envelopes. More...
class	AudioEquationParser
	Equation parser with audio-specific functions for DSP processing. More...
class	AudioFifo
	Lock-free audio FIFO buffer for single producer/consumer scenarios. More...
struct	FuncState
	Base class for storing state in audio functions. More...
struct	OscState
	State storage for oscillator functions in AudioEquationParser. More...
struct	NoiseState
	State storage for noise generator in AudioEquationParser. More...
struct	HP12State
	State storage for 12dB/octave highpass filter in AudioEquationParser. More...
struct	HP24State
	State storage for 24dB/octave highpass filter in AudioEquationParser. More...
struct	BP12State
	State storage for 12dB/octave bandpass filter in AudioEquationParser. More...
struct	BP24State
	State storage for 24dB/octave bandpass filter in AudioEquationParser. More...
struct	LP12State
	State storage for 12dB/octave lowpass filter in AudioEquationParser. More...
struct	LP24State
	State storage for 24dB/octave lowpass filter in AudioEquationParser. More...
struct	Notch12State
	State storage for 12dB/octave notch filter in AudioEquationParser. More...
struct	Notch24State
	State storage for 24dB/octave notch filter in AudioEquationParser. More...
class	AudioFunctionHost
	State management for audio functions in AudioEquationParser. More...
class	AudioMetadata
	Extracts musical metadata from audio files. More...
class	AudioMidiFifo
	Combined audio and MIDI buffer for synchronized processing within a single thread. More...
class	GainProcessor
	Simple gain processor with ramping to avoid discontinuities. More...
class	WetDryMix
	Mix between wet and dry with a nice curve. More...
class	BandLimitedLookupTable
	Lookup tables for holding bandlimited waveforms. More...
class	BandLimitedLookupTables
	Generate and hold bandlimited lookup tables for all the common waveforms. More...
struct	Biquad
	Single RBJ biquad, per sample. More...
class	BitCrusher
	Anti-aliased bitcrusher with independent bit depth and sample rate reduction. More...
class	CorrelationMeter
	Stereo phase correlation and balance meter. More...
class	DCBlocker
	Estimates the DC (very low frequency) content of a signal so it can be removed to form a DC blocker. More...
class	DelayLine
	Multi-channel delay line with interpolated tap reading. More...
class	AirWindowsDistortion
	Sine-based waveshaping distortion effect based on AirWindows plugins. More...
class	Dither
	Dither and noise shaping for bit depth reduction. More...
class	EnvelopeDetector
	Envelope follower for dynamics processing. More...
class	Dynamics
	Dynamics processor supporting compression, limiting, expansion, and gating. More...
struct	LinearEasing
	Linear easing function object (no easing). More...
struct	QuadraticInEasing
	Quadratic In easing function object. More...
struct	QuadraticOutEasing
	Quadratic Out easing function object. More...
struct	QuadraticInOutEasing
	Quadratic InOut easing function object. More...
struct	CubicInEasing
	Cubic In easing function object. More...
struct	CubicOutEasing
	Cubic Out easing function object. More...
struct	CubicInOutEasing
	Cubic InOut easing function object. More...
struct	QuarticInEasing
	Quartic In easing function object. More...
struct	QuarticOutEasing
	Quartic Out easing function object. More...
struct	QuarticInOutEasing
	Quartic InOut easing function object. More...
struct	QuinticInEasing
	Quintic In easing function object. More...
struct	QuinticOutEasing
	Quintic Out easing function object. More...
struct	QuinticInOutEasing
	Quintic InOut easing function object. More...
struct	SineInEasing
	Sine In easing function object. More...
struct	SineOutEasing
	Sine Out easing function object. More...
struct	SineInOutEasing
	Sine InOut easing function object. More...
struct	CircularInEasing
	Circular In easing function object. More...
struct	CircularOutEasing
	Circular Out easing function object. More...
struct	CircularInOutEasing
	Circular InOut easing function object. More...
struct	ExponentialInEasing
	Exponential In easing function object. More...
struct	ExponentialOutEasing
	Exponential Out easing function object. More...
struct	ExponentialInOutEasing
	Exponential InOut easing function object. More...
struct	ElasticInEasing
	Elastic In easing function object. More...
struct	ElasticOutEasing
	Elastic Out easing function object. More...
struct	ElasticInOutEasing
	Elastic InOut easing function object. More...
struct	BackInEasing
	Back In easing function object. More...
struct	BackOutEasing
	Back Out easing function object. More...
struct	BackInOutEasing
	Back InOut easing function object. More...
struct	BounceInEasing
	Bounce In easing function object. More...
struct	BounceOutEasing
	Bounce Out easing function object. More...
struct	BounceInOutEasing
	Bounce InOut easing function object. More...
class	EasedValueSmoother< T, EasingFunction >
	Smooths a value using an easing function for natural-feeling transitions. More...
class	EQ
	Multi-channel, multi-band equalizer with flexible filter types. More...
class	Exciter
	Aural exciter - adds harmonics generated from the top of the signal. More...
class	FastMath< F >
	Fast approximations for trigonometric and hyperbolic functions. More...
class	Filter
	Multi-channel biquad filter with multiple types and slopes. More...
class	GateEffect
	Rhythmic gate effect with programmable step sequencing. More...
class	GraphicEQ
	Multi-band graphic equalizer with configurable band count and per-channel control. More...
class	KickSynth
	Kick reinforcement - synthesises low end triggered by transients. More...
class	LevelTracker
	Track audio levels with decay in dB. More...
class	LFO
	Low-Frequency Oscillator with 18 waveform shapes and modulation features. More...
struct	LFO::Parameters
class	KWeightingFilter
	The two stage K-weighting filter from ITU-R BS.1770: a high shelf that models the acoustic effect of the head followed by a high pass. More...
struct	KWeightingFilter::Coefficients
class	LoudnessMeter
	Loudness meter per ITU-R BS.1770-4 / EBU R128. More...
class	Maximizer
	Zero crossing maximizer. More...
class	MidiFifo
	Simple MIDI buffer for time-shifting MIDI events within a single thread. More...
class	MidiFilePlayer
	Plays back MIDI files with configurable tempo. More...
class	Modulation
	Modulated delay effect for chorus, flanger, and phaser effects. More...
class	MSEG
	Multi-Segment Envelope Generator (MSEG) for complex modulation curves. More...
struct	MSEG::Parameters
struct	MSEG::Point
struct	MSEG::Data
class	WhiteNoise
	White noise generator using a normal distribution. More...
class	PinkNoise
	Pink noise generator using the Voss-McCartney algorithm. More...
class	StereoOscillator
	Virtual analog stereo oscillator with band-limited waveforms. More...
struct	StereoOscillator::Params
struct	VoicedOscillatorParams
	Parameters for VoicedStereoOscillator configuration. More...
class	VoicedStereoOscillator< O, P >
	Stereo oscillator with multiple voices for unison/detuning effects. More...
struct	VoicedStereoOscillatorParams
	Extended parameters for band-limited voiced stereo oscillator. More...
class	BLLTVoicedStereoOscillator
	Band-limited stereo oscillator with multiple voices for unison effects. More...
class	PlateReverb< F, I >
	Plate reverb from Dattorro's paper. More...
class	ResamplingFifo
	High-quality sample rate conversion FIFO using libsamplerate. More...
class	RMSMeter
	Sliding window RMS meter, one reading per channel. More...
class	Sample
	Audio sample container for loading and playing back sample data. More...
class	SampleOscillator
	Sample-based oscillator with pitch tracking and looping capabilities. More...
class	SamplePlayer
class	ScratchBuffer
	Temporary audio buffer allocated from a shared pool to avoid allocations. More...
class	SimpleVerb
	Simple stereo reverb effect with room size and damping controls. More...
class	SoftClipper
	Soft clipper with an adjustable knee, worked out in the dB domain. More...
class	StepLFO
	Step sequencer-style LFO with programmable values per step. More...
class	StereoDelay
	Stereo delay effect with feedback, cross-feedback, and wet/dry mix. More...
class	StereoEnhancer
	Stereo Enhancer. More...
class	StereoProcessor
	Stereo Processor. More...
struct	GlideInfo
	Configuration for pitch glide (portamento/glissando) between notes. More...
class	SynthesiserVoice
	Extended synthesizer voice with glide support and fast-kill capability. More...
class	Synthesiser
	Advanced MPE-capable synthesizer with mono/poly modes, glide, and voice management. More...
class	TextRenderer
	Render audio to ascii waveforms. More...
class	TransientShaper
	Transient shaper - independent control over attack and sustain. More...
class	TruePeakMeter
	True peak meter per ITU-R BS.1770 Annex 2: the signal is oversampled (4x below 96 kHz, 2x below 192 kHz) so peaks that fall between samples are measured. More...
class	ValueSmoother< T >
	Linearly smooths parameter changes over time at a constant rate. More...
class	Wavetable
	Wrapper around juce::OwnedArray<BandLimitedLookupTable> for managing multiple wavetables. More...
class	WTOscillator
	Wavetable oscillator with interpolation and shaping options. More...
struct	WTOscillator::Params
struct	WTVoicedStereoOscillatorParams
	Extended parameters for wavetable voiced stereo oscillator. More...
class	WTVoicedStereoOscillator
	Stereo wavetable oscillator with multiple voices for unison/detuning effects. More...

Enumerations
enum class	Wave {   Wave::silence = 0 , Wave::sine = 1 , Wave::triangle = 2 , Wave::sawUp = 3 ,   Wave::sawDown = 4 , Wave::pulse = 5 , Wave::square = 6 , Wave::whiteNoise = 7 ,   Wave::pinkNoise = 8 }
	Waveform types for band-limited oscillators. More...

Functions
juce::Value	findValue (juce::ValueTree &state, juce::Identifier name, juce::var value)
template<class T>
T	getMidiNoteInHertz (const T noteNumber, const T frequencyOfA=(T) 440.0)
template<class T>
T	getMidiNoteFromHertz (const T freq, const T frequencyOfA=(T) 440.0)
float	velocityToGain (float velocity, float sensitivity=1.0f)
void	applyGain (juce::AudioSampleBuffer &buffer, juce::LinearSmoothedValue< float > &gain)
void	applyGain (juce::AudioSampleBuffer &buffer, int channel, juce::LinearSmoothedValue< float > &gain)
void	clip (juce::AudioSampleBuffer &buffer, float low=-1.0f, float high=1.0f)
juce::String	getMidiMessageType (const juce::MidiMessage &msg)
juce::AudioSampleBuffer	sliceBuffer (juce::AudioSampleBuffer &input, int start, int length)
	Get a section of an audio buffer.
juce::MidiBuffer	sliceMidiBuffer (const juce::MidiBuffer &input, int start, int length)
	Get a section of a MIDI buffer with timestamps adjusted to start from 0.
ScratchBuffer	monoBuffer (const juce::AudioSampleBuffer &input)
	Get a buffer but mono.
template<class T>
T	lerp (T a, T b, T t)
	Computes the linear interpolation between a and b, if the parameter t is inside [0, 1].
template<class T>
int	sign (T x)
	Sign +1 or -1 of number.
float	sine (float phase, float unused1=0, float unused2=0)
	Band-limited sine wave generator.
float	triangle (float phase, float freq, float sampleRate)
	Band-limited triangle wave generator.
float	sawUp (float phase, float freq, float sampleRate)
	Band-limited upward sawtooth wave generator.
float	sawDown (float phase, float freq, float sampleRate)
	Band-limited downward sawtooth wave generator.
float	pulse (float phase, float pw, float freq, float sampleRate)
	Band-limited pulse wave generator with variable pulse width.
float	squareWave (float phase, float freq, float sampleRate)
	Band-limited square wave generator (50% duty cycle pulse).
juce::AudioSampleBuffer	resampleBuffer (juce::AudioSampleBuffer &, double inputRate, double outputRate, int quality=4)
	Resamples an entire audio buffer from one sample rate to another.
bool	loadWavetables (Wavetable &bllt, double playbackSampleRate, juce::AudioSampleBuffer &buffer, double fileSampleRate, int tableSize)

Variables
constexpr float	Q = 0.70710678118655f

Detailed Description

Enumeration Type Documentation

Wave

enum class Wave

strong

Waveform types for band-limited oscillators.

Wave enum defines the available waveform shapes for oscillators using band-limited lookup tables. Each waveform (except noise types) is pre-computed with appropriate band-limiting to prevent aliasing.

Available Waveforms:

• silence: No output (0.0)
• sine: Pure sine wave (fundamental only, no harmonics)
• triangle: Triangle wave with soft harmonics
• sawUp: Upward sawtooth (ramp up from -1 to 1)
• sawDown: Downward sawtooth (ramp down from 1 to -1)
• pulse: Variable pulse width waveform
• square: Square wave (50% duty cycle pulse)
• whiteNoise: White noise (equal energy across all frequencies)
• pinkNoise: Pink noise (equal energy per octave, -3dB/octave)

See also

BandLimitedLookupTables, BandLimitedLookupTable

Enumerator
silence	Silence (outputs 0.0).
sine	Sine wave.
triangle	Triangle wave.
sawUp	Upward sawtooth.
sawDown	Downward sawtooth.
pulse	Pulse wave (variable width).
square	Square wave (50% pulse).
whiteNoise	White noise.
pinkNoise	Pink noise.

Function Documentation

findValue()

juce::Value findValue	(	juce::ValueTree &	state,
		juce::Identifier	name,
		juce::var	value )

getMidiNoteInHertz()

template<class T>

T getMidiNoteInHertz	(	const T	noteNumber,
		const T	frequencyOfA = (T)440.0 )

Referenced by BandLimitedLookupTable::reset().

getMidiNoteFromHertz()

template<class T>

T getMidiNoteFromHertz	(	const T	freq,
		const T	frequencyOfA = (T)440.0 )

velocityToGain()

float velocityToGain	(	float	velocity,
		float	sensitivity = 1.0f )

applyGain() [1/2]

void applyGain	(	juce::AudioSampleBuffer &	buffer,
		juce::LinearSmoothedValue< float > &	gain )

applyGain() [2/2]

void applyGain	(	juce::AudioSampleBuffer &	buffer,
		int	channel,
		juce::LinearSmoothedValue< float > &	gain )

clip()

void clip	(	juce::AudioSampleBuffer &	buffer,
		float	low = -1.0f,
		float	high = 1.0f )

getMidiMessageType()

juce::String getMidiMessageType

(

const juce::MidiMessage &

msg

)

sliceBuffer()

juce::AudioSampleBuffer sliceBuffer	(	juce::AudioSampleBuffer &	input,
		int	start,
		int	length )

Get a section of an audio buffer.

sliceMidiBuffer()

juce::MidiBuffer sliceMidiBuffer	(	const juce::MidiBuffer &	input,
		int	start,
		int	length )

Get a section of a MIDI buffer with timestamps adjusted to start from 0.

monoBuffer()

ScratchBuffer monoBuffer

(

const juce::AudioSampleBuffer &

input

)

Get a buffer but mono.

lerp()

template<class T>

T lerp	(	T	a,
		T	b,
		T	t )

Computes the linear interpolation between a and b, if the parameter t is inside [0, 1].

sign()

template<class T>

int sign

(

T

x

)

Sign +1 or -1 of number.

sine()

float sine	(	float	phase,
		float	unused1 = 0,
		float	unused2 = 0 )

Band-limited sine wave generator.

Generates a pure sine wave at the given phase. No band-limiting is needed for sine waves as they contain only the fundamental frequency.

Parameters

phase	Phase position (0.0 to 1.0)
unused1	Unused parameter for API consistency
unused2	Unused parameter for API consistency

Returns

Sample value (-1.0 to 1.0)

triangle()

float triangle	(	float	phase,
		float	freq,
		float	sampleRate )

Band-limited triangle wave generator.

Generates an anti-aliased triangle wave using pre-computed band-limited wavetables based on the fundamental frequency.

Parameters

phase	Phase position (0.0 to 1.0)
freq	Fundamental frequency in Hz
sampleRate	Current sample rate

Returns

Sample value (-1.0 to 1.0)

sawUp()

float sawUp	(	float	phase,
		float	freq,
		float	sampleRate )

Band-limited upward sawtooth wave generator.

Generates an anti-aliased sawtooth wave that rises from -1 to 1 using pre-computed band-limited wavetables.

Parameters

phase	Phase position (0.0 to 1.0)
freq	Fundamental frequency in Hz
sampleRate	Current sample rate

Returns

Sample value (-1.0 to 1.0)

sawDown()

float sawDown	(	float	phase,
		float	freq,
		float	sampleRate )

Band-limited downward sawtooth wave generator.

Generates an anti-aliased sawtooth wave that falls from 1 to -1 using pre-computed band-limited wavetables.

Parameters

phase	Phase position (0.0 to 1.0)
freq	Fundamental frequency in Hz
sampleRate	Current sample rate

Returns

Sample value (-1.0 to 1.0)

pulse()

float pulse	(	float	phase,
		float	pw,
		float	freq,
		float	sampleRate )

Band-limited pulse wave generator with variable pulse width.

Generates an anti-aliased pulse wave with adjustable pulse width (duty cycle). Uses pre-computed band-limited wavetables for alias-free waveforms.

Parameters

phase	Phase position (0.0 to 1.0)
pw	Pulse width / duty cycle (0.0 to 1.0, 0.5 = square wave)
freq	Fundamental frequency in Hz
sampleRate	Current sample rate

Returns

Sample value (-1.0 to 1.0)

squareWave()

float squareWave	(	float	phase,
		float	freq,
		float	sampleRate )

Band-limited square wave generator (50% duty cycle pulse).

Generates an anti-aliased square wave using pre-computed band-limited wavetables. Equivalent to pulse() with pw = 0.5.

Parameters

phase	Phase position (0.0 to 1.0)
freq	Fundamental frequency in Hz
sampleRate	Current sample rate

Returns

Sample value (-1.0 to 1.0)

resampleBuffer()

juce::AudioSampleBuffer resampleBuffer	(	juce::AudioSampleBuffer &	,
		double	inputRate,
		double	outputRate,
		int	quality = 4 )

Resamples an entire audio buffer from one sample rate to another.

This is a convenience function that resamples a complete audio buffer in one operation, without requiring a ResamplingFifo. Useful for offline processing where you need to convert an entire buffer at once.

Parameters

buffer	The audio buffer to resample (input)
inputRate	The sample rate of the input buffer
outputRate	The desired output sample rate
quality	Resampling quality (0-4, default 4): 0 = SRC_SINC_FASTEST, 1 = SRC_SINC_MEDIUM_QUALITY, 2 = SRC_SINC_BEST_QUALITY, 3 = SRC_ZERO_ORDER_HOLD, 4 = SRC_LINEAR

Returns

A new AudioSampleBuffer at the output sample rate

See also

ResamplingFifo

loadWavetables()

bool loadWavetables	(	Wavetable &	bllt,
		double	playbackSampleRate,
		juce::AudioSampleBuffer &	buffer,
		double	fileSampleRate,
		int	tableSize )

Variable Documentation

Q

float Q = 0.70710678118655f

constexpr

Referenced by Filter::getResponseMagnitude(), BP24State::process(), HP24State::process(), LP24State::process(), Notch24State::process(), and Filter::setParams().