daisysp

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

Classes

	Name
class	daisysp::AdEnv
class	daisysp::Adsr
class	daisysp::Line
class	daisysp::Phasor
class	daisysp::AnalogBassDrum 808 bass drum model, revisited.
class	daisysp::AnalogSnareDrum 808 snare drum model, revisited.
class	daisysp::SquareNoise 808 style "metallic noise" with 6 square oscillators.
class	daisysp::RingModNoise Ring mod style metallic noise generator.
class	daisysp::SwingVCA Swing type VCA.
class	daisysp::LinearVCA Linear type VCA.
class	daisysp::HiHat 808 HH, with a few extra parameters to push things to the CY territory...
class	daisysp::SyntheticBassDrumClick Click noise for SyntheticBassDrum.
class	daisysp::SyntheticBassDrumAttackNoise Attack Noise generator for SyntheticBassDrum.
class	daisysp::SyntheticBassDrum Naive bass drum model (modulated oscillator with FM + envelope).
class	daisysp::SyntheticSnareDrum Naive snare drum model (two modulated oscillators + filtered noise).
class	daisysp::Balance
class	daisysp::Compressor
class	daisysp::CrossFade
class	daisysp::Limiter
class	daisysp::Autowah
class	daisysp::Bitcrush
class	daisysp::ChorusEngine Single Chorus engine. Used in Chorus.
class	daisysp::Chorus Chorus Effect.
class	daisysp::Decimator
class	daisysp::Flanger Flanging Audio Effect.
class	daisysp::Fold
class	daisysp::Overdrive Distortion / Overdrive Module.
class	daisysp::PhaserEngine Single Phaser engine. Used in Phaser.
class	daisysp::Phaser Phaser Effect.
class	daisysp::PitchShifter
struct	daisysp::ReverbScDl
class	daisysp::ReverbSc
class	daisysp::SampleRateReducer Sample rate reducer.
class	daisysp::Tremolo Tremolo effect.
class	daisysp::Wavefolder
class	daisysp::Allpass
class	daisysp::ATone
class	daisysp::Biquad
class	daisysp::Comb
struct	daisysp::FIRMemory
struct	daisysp::FIRMemory< 0, 0 >
class	daisysp::FIRFilterImplGeneric
class	daisysp::Mode
class	daisysp::MoogLadder
class	daisysp::NlFilt
class	daisysp::Soap
class	daisysp::Svf
class	daisysp::Tone
class	daisysp::ClockedNoise
class	daisysp::Dust Dust Module.
class	daisysp::FractalRandomGenerator Fractal Noise, stacks octaves of a noise source.
class	daisysp::GrainletOscillator Granular Oscillator Module.
class	daisysp::Particle Random impulse train processed by a resonant filter.
class	daisysp::WhiteNoise
class	daisysp::Drip
class	daisysp::String Comb filter / KS string.
class	daisysp::ModalVoice Simple modal synthesis voice with a mallet exciter: click -> LPF -> resonator.
class	daisysp::Pluck
class	daisysp::PolyPluck
class	daisysp::ResonatorSvf SVF for use in the Resonator Class .
class	daisysp::Resonator Resonant Body Simulation.
class	daisysp::StringVoice Extended Karplus-Strong, with all the niceties from Rings.
class	daisysp::GranularPlayer
class	daisysp::BlOsc
class	daisysp::Fm2
class	daisysp::FormantOscillator Formant Oscillator Module.
class	daisysp::HarmonicOscillator Harmonic Oscillator Module based on Chebyshev polynomials.
class	daisysp::Oscillator
class	daisysp::OscillatorBank Oscillator Bank module.
class	daisysp::VariableSawOscillator Variable Saw Oscillator.
class	daisysp::VariableShapeOscillator Variable Waveshape Oscillator.
class	daisysp::VosimOscillator Vosim Oscillator Module .
class	daisysp::ZOscillator ZOscillator Module .
class	daisysp::DcBlock
class	daisysp::DelayLine
class	daisysp::Jitter
class	daisysp::Looper
class	daisysp::Maytrig
class	daisysp::Metro
class	daisysp::Port
class	daisysp::SampleHold
class	daisysp::SmoothRandomGenerator Smooth random generator for internal modulation. .

Types

	Name
enum	AdEnvSegment
enum	@0
enum	@1
enum	@2
enum class	Mapping
template <size_t max_size,size_t max_block> using FIRFilterImplGeneric< max_size, max_block >	FIR

Functions

	Name
uint32_t	hash_xs32(uint32_t x)
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)

Attributes

	Name
constexpr float	kRandFrac
constexpr float	kOneTwelfth

Detailed Description

FIR Filter implementation, generic and ARM CMSIS DSP based.

Author: Alexander Petrov-Savchenko ([email protected])

Date: February 2021

Types Documentation

enum AdEnvSegment

Enumerator	Value	Description
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)

See: AdEnv

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

enum @0

Enumerator	Value	Description
ADSR_SEG_IDLE	0
ADSR_SEG_ATTACK	1
ADSR_SEG_DECAY	2
ADSR_SEG_RELEASE	4

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

enum @1

Enumerator	Value	Description
CROSSFADE_LIN
CROSSFADE_CPOW
CROSSFADE_LOG
CROSSFADE_EXP
CROSSFADE_LAST

Curve applied to the CrossFade

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

enum @2

Enumerator	Value	Description
PLUCK_MODE_RECURSIVE
PLUCK_MODE_WEIGHTED_AVERAGE
PLUCK_LAST

The method of natural decay that the algorithm will use.

• RECURSIVE: 1^st order recursive filter, with coefs .5.
• WEIGHTED_AVERAGE: weighted averaging.

enum Mapping

Enumerator	Value	Description
LINEAR
EXP
LOG

Curves to use with the fmap function

using FIR

template <size_t max_size,
size_t max_block>
using daisysp::FIR = typedef FIRFilterImplGeneric<max_size, max_block>;

Functions Documentation

function hash_xs32

static inline uint32_t hash_xs32(
    uint32_t x
)

function myrand

inline uint32_t myrand()

function fmax

inline float fmax(
    float a,
    float b
)

efficient floating point min/max ℅ stephen mccaul

function fmin

inline float fmin(
    float a,
    float b
)

function fclamp

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

quick fp clamp

function fastpower

inline float fastpower(
    float f,
    int n
)

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

function fastroot

inline float fastroot(
    float f,
    int n
)

function fastmod1f

inline float fastmod1f(
    float x
)

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

function pow10f

inline float pow10f(
    float f
)

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)

function fastlog2f

inline float fastlog2f(
    float f
)

function fastlog10f

inline float fastlog10f(
    float f
)

function mtof

inline float mtof(
    float m
)

Midi to frequency helper

function fonepole

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

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

function fmap

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

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.

Returns:

• returns the transformed float within the new range.

See: Mapping

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

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

function median

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

Simple 3-point median filter ℅ stephen mccaul

function ThisBlepSample

inline float ThisBlepSample(
    float t
)

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

function NextBlepSample

inline float NextBlepSample(
    float t
)

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

function NextIntegratedBlepSample

inline float NextIntegratedBlepSample(
    float t
)

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

function ThisIntegratedBlepSample

inline float ThisIntegratedBlepSample(
    float t
)

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

function SoftLimit

inline float SoftLimit(
    float x
)

Soft Limiting function ported extracted from pichenettes/stmlib

function SoftClip

inline float SoftClip(
    float x
)

Soft Clipping function extracted from pichenettes/stmlib

function TestFloat

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

Parameters:

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

Quick check for Invalid float values (NaN, Inf, out of range) When DEBUG is true in the build, this will halt execution for tracing the reason for the invalidity.

function soft_saturate

inline float soft_saturate(
    float in,
    float thresh
)

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

function is_power2

constexpr bool is_power2(
    uint32_t x
)

function get_next_power2

inline uint32_t get_next_power2(
    uint32_t x
)

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.

Attributes Documentation

variable kRandFrac

static constexpr float kRandFrac = 1.f / (float)RAND_MAX;

variable kOneTwelfth

static constexpr float kOneTwelfth = 1.f / 12.f;

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Updated on 2024-01-03 at 19:38:46 +0000