FIR Filter implementation, generic and ARM CMSIS DSP based. More...

Classes
class	AdEnv

class	Adsr

class	AnalogBassDrum
	808 bass drum model, revisited. More...

class	AnalogSnareDrum
	808 snare drum model, revisited. More...

class	Autowah

class	Chorus
	Chorus Effect. More...

class	ChorusEngine
	Single Chorus engine. Used in Chorus. More...

class	ClockedNoise

class	CrossFade

class	DcBlock

class	Decimator

class	DelayLine

class	Drip

class	Dust
	Dust Module. More...

class	FIRFilterImplGeneric

struct	FIRMemory

struct	FIRMemory< 0, 0 >

class	Flanger
	Flanging Audio Effect. More...

class	Fm2

class	FormantOscillator
	Formant Oscillator Module. More...

class	FractalRandomGenerator
	Fractal Noise, stacks octaves of a noise source. More...

class	GrainletOscillator
	Granular Oscillator Module. More...

class	GranularPlayer

class	HarmonicOscillator
	Harmonic Oscillator Module based on Chebyshev polynomials. More...

class	HiHat
	808 HH, with a few extra parameters to push things to the CY territory... More...

class	LadderFilter

class	Limiter

class	LinearVCA
	Linear type VCA. More...

class	Looper

class	Maytrig

class	Metro

class	ModalVoice
	Simple modal synthesis voice with a mallet exciter: click -> LPF -> resonator. More...

class	OnePole
	One Pole Lowpass / Highpass Filter. More...

class	Oscillator

class	OscillatorBank
	Oscillator Bank module. More...

class	Overdrive
	Distortion / Overdrive Module. More...

class	Particle
	Random impulse train processed by a resonant filter. More...

class	Phaser
	Phaser Effect. More...

class	PhaserEngine
	Single Phaser engine. Used in Phaser. More...

class	Phasor

class	PitchShifter

class	Resonator
	Resonant Body Simulation. More...

class	ResonatorSvf
	SVF for use in the Resonator Class . More...

class	RingModNoise
	Ring mod style metallic noise generator. More...

class	SampleHold

class	SampleRateReducer
	Sample rate reducer. More...

class	SmoothRandomGenerator
	Smooth random generator for internal modulation. . More...

class	Soap

class	SquareNoise
	808 style "metallic noise" with 6 square oscillators. More...

class	String
	Comb filter / KS string. More...

class	StringVoice
	Extended Karplus-Strong, with all the niceties from Rings. More...

class	Svf

class	SwingVCA
	Swing type VCA. More...

class	SyntheticBassDrum
	Naive bass drum model (modulated oscillator with FM + envelope). More...

class	SyntheticBassDrumAttackNoise
	Attack Noise generator for SyntheticBassDrum. More...

class	SyntheticBassDrumClick
	Click noise for SyntheticBassDrum. More...

class	SyntheticSnareDrum
	Naive snare drum model (two modulated oscillators + filtered noise). More...

class	Tremolo
	Tremolo effect. More...

class	VariableSawOscillator
	Variable Saw Oscillator. More...

class	VariableShapeOscillator
	Variable Waveshape Oscillator. More...

class	VosimOscillator
	Vosim Oscillator Module . More...

class	Wavefolder

class	WhiteNoise

class	ZOscillator
	ZOscillator Module . More...

Typedefs
template<size_t max_size, size_t max_block>
using	FIR = FIRFilterImplGeneric<max_size, max_block>

Enumerations
enum	AdEnvSegment { ADENV_SEG_IDLE , ADENV_SEG_ATTACK , ADENV_SEG_DECAY , ADENV_SEG_LAST }

enum	{ ADSR_SEG_IDLE = 0 , ADSR_SEG_ATTACK = 1 , ADSR_SEG_DECAY = 2 , ADSR_SEG_RELEASE = 4 }

enum	{ CROSSFADE_LIN , CROSSFADE_CPOW , CROSSFADE_LOG , CROSSFADE_EXP , CROSSFADE_LAST }

enum class	Mapping { LINEAR , EXP , LOG }

Functions
uint32_t	myrand ()

float	fmax (float a, float b)

float	fmin (float a, float b)

float	fclamp (float in, float min, float max)

float	fastpower (float f, int n)

float	fastroot (float f, int n)

float	fastmod1f (float x)

float	pow10f (float f)

float	fastlog2f (float f)

float	fastlog10f (float f)

float	mtof (float m)

void	fonepole (float &out, float in, float coeff)

float	fmap (float in, float min, float max, Mapping curve=Mapping::LINEAR)

template<typename T >
T	median (T a, T b, T c)

float	ThisBlepSample (float t)

float	NextBlepSample (float t)

float	NextIntegratedBlepSample (float t)

float	ThisIntegratedBlepSample (float t)

float	SoftLimit (float x)

float	SoftClip (float x)

void	TestFloat (float &x, float y=0.f)

float	soft_saturate (float in, float thresh)

constexpr bool	is_power2 (uint32_t x)

uint32_t	get_next_power2 (uint32_t x)

Detailed Description

FIR Filter implementation, generic and ARM CMSIS DSP based.

Author: Alexander Petrov-Savchenko (axp@s.nosp@m.oft-.nosp@m.amp.c.nosp@m.om)

Date: February 2021

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Distinct stages that the phase of the envelope can be located in.

IDLE = located at phase location 0, and not currently running
ATTACK = First segment of envelope where phase moves from 0 to 1
DECAY = Second segment of envelope where phase moves from 1 to SUSTAIN value
RELEASE = Fourth segment of envelop where phase moves from SUSTAIN to 0

◆ anonymous enum

anonymous enum

Curve applied to the CrossFade

LIN = linear
CPOW = constant power
LOG = logarithmic
EXP exponential
LAST = end of enum (used for array indexing)

◆ AdEnvSegment

enum daisysp::AdEnvSegment

Distinct stages that the phase of the envelope can be located in.

See also: AdEnv

Enumerator
ADENV_SEG_IDLE	located at phase location 0, and not currently running
ADENV_SEG_ATTACK	First segment of envelope where phase moves from MIN value to MAX value
ADENV_SEG_DECAY	Second segment of envelope where phase moves from MAX to MIN value
ADENV_SEG_LAST	The final segment of the envelope (currently decay)

◆ Mapping

enum class daisysp::Mapping

strong

Curves to use with the fmap function

Function Documentation

◆ fastmod1f()

float daisysp::fastmod1f ( float x )

inline

Significantly more efficient than fmodf(x, 1.0f) for calculating the decimal part of a floating point value.

◆ fastpower()

float daisysp::fastpower	(	float	f,
		int	n )

inline

From Musicdsp.org "Fast power and root estimates for 32bit floats) Original code by Stefan Stenzel These are approximations

◆ fclamp()

float daisysp::fclamp	(	float	in,
		float	min,
		float	max )

inline

quick fp clamp

◆ fmap()

float daisysp::fmap	(	float	in,
		float	min,
		float	max,
		Mapping	curve = Mapping::LINEAR )

inline

Maps a float between a specified range, using a specified curve.

Parameters

in	a value between 0 to 1 that will be mapped to the new range.
min	the new minimum value
max	the new maxmimum value
curve	a Mapping Value to adjust the response curve of the transformation defaults to Linear.

See also: Mapping

When using the log curve min and max, must be greater than zero.

Return values

returns the transformed float within the new range.

◆ fmax()

float daisysp::fmax	(	float	a,
		float	b )

inline

efficient floating point min/max c/o stephen mccaul

◆ fonepole()

void daisysp::fonepole	(	float &	out,
		float	in,
		float	coeff )

inline

one pole lpf out is passed by reference, and must be retained between calls to properly filter the signal coeff can be calculated: coeff = 1.0 / (time * sample_rate) ; where time is in seconds

◆ get_next_power2()

uint32_t daisysp::get_next_power2 ( uint32_t x )

inline

Prior to C++14 constexpr functions were required to be a single return statement. So this clause guards against that behavior to allow the library, and this function to continue to work with C++11. The function itself is not currently (12 May 2021) used within the library itself.

◆ median()

template<typename T >

T daisysp::median	(	T	a,
		T	b,
		T	c )

Simple 3-point median filter c/o stephen mccaul

◆ mtof()

float daisysp::mtof ( float m )

inline

Midi to frequency helper

◆ NextBlepSample()

float daisysp::NextBlepSample ( float t )

inline

Ported from pichenettes/eurorack/plaits/dsp/oscillator/oscillator.h

◆ NextIntegratedBlepSample()

float daisysp::NextIntegratedBlepSample ( float t )

inline

Ported from pichenettes/eurorack/plaits/dsp/oscillator/oscillator.h

◆ pow10f()

float daisysp::pow10f ( float f )

inline

From http://openaudio.blogspot.com/2017/02/faster-log10-and-pow.html No approximation, pow10f(x) gives a 90% speed increase over powf(10.f, x)

◆ soft_saturate()

float daisysp::soft_saturate	(	float	in,
		float	thresh )

inline

Based on soft saturate from: musicdsp.org Bram de Jong (2002-01-17) This still needs to be tested/fixed. Definitely does some weird stuff described as: x < a: f(x) = x x > a: f(x) = a + (x-a)/(1+((x-a)/(1-a))^2) x > 1: f(x) = (a + 1)/2

◆ SoftClip()

float daisysp::SoftClip ( float x )

inline

Soft Clipping function extracted from pichenettes/stmlib

◆ SoftLimit()

float daisysp::SoftLimit ( float x )

inline

Soft Limiting function ported extracted from pichenettes/stmlib

◆ TestFloat()

void daisysp::TestFloat	(	float &	x,
		float	y = 0.f )

inline

Quick check for Invalid float values (NaN, Inf, out of range)

Parameters

x	value passed by reference, replaced by y if invalid.
y	value to replace x if invalidity is found.

When DEBUG is true in the build, this will halt execution for tracing the reason for the invalidity.

◆ ThisBlepSample()

float daisysp::ThisBlepSample ( float t )

inline

Ported from pichenettes/eurorack/plaits/dsp/oscillator/oscillator.h

◆ ThisIntegratedBlepSample()

float daisysp::ThisIntegratedBlepSample ( float t )

inline

Ported from pichenettes/eurorack/plaits/dsp/oscillator/oscillator.h

Classes

Typedefs

Enumerations

Functions

Detailed Description

Enumeration Type Documentation

◆ anonymous enum

◆ anonymous enum

◆ AdEnvSegment

◆ Mapping

Function Documentation

◆ fastmod1f()

◆ fastpower()

◆ fclamp()

◆ fmap()

◆ fmax()

◆ fonepole()

◆ get_next_power2()

◆ median()

◆ mtof()

◆ NextBlepSample()

◆ NextIntegratedBlepSample()

◆ pow10f()

◆ soft_saturate()

◆ SoftClip()

◆ SoftLimit()

◆ TestFloat()

◆ ThisBlepSample()

◆ ThisIntegratedBlepSample()