Edge of Chaos
Introduction
This repository contains libraries including some essential building blocks for the implementation of musical complex adaptive systems in the Faust programming environment. (https://faust.grame.fr.)
It includes a set of time-domain algorithms, some of which are original, for the processing of low-level and high-level information as well as the processing of sound using standard and non-conventional techniques. It also includes functions for the realisation of networks with different topologies, linear and nonlinear mapping strategies to render positive and negative feedback relationships, and different kinds of energy-preserving techniques for the stability of self-oscillating systems.
Edge of Chaos is being developed and maintained by Dario Sanfilippo, and it is the library through which he creates his music.
Overview of the library modules
allEOC.lib: access to all Edge of Chaos library modules from a
single point.
auxiliaryEOC.lib: auxiliary functions library for testing, analysis,
inspection, and debugging.
delaysEOC.lib: delay line functions library with
samplerate-independent delay parameters based on
aust's delay lines for integer and fractional delays.
edgeofchaos.lib: this file provides access to all the Edge of Chaos
library modules through a series of environments.
filtersEOC.lib: filters library containing bilinear transform and
topology preserving transform implementations
(zero-delay feedback) of allpass, lowpass, highpass,
bandpass, bandstop, shelving, and state-variable
filters. Furthermore, there are implementations of
crossovers, comb-integrator circuits, analytic filters,
and integrators, among others.
informationEOC.lib: information processing functions library including
low-level and high-level algorithms both based on
hard-coded and adaptive mechanisms. The low-level
functions provide time-domain techniques for feature
extraction that are normally based on FFT processing,
such as spectral centroid and spectral flatness
(noisiness). The high-level functions provide an
analysis of the state space of low-level information
signals to determine, based on notions of complexity
theory and music perception, characteristics such as
dynamicity, heterogeneity, and complexity of audio
streams.
mathsEOC.lib: math library containing functions for statistics,
linear and nonlinear fuzzy logic, interpolators,
network topologies, matrices, linear and nonlinear
mapping, windowing functions, hysteresis, angular
frequency, and several time constants for exponential
decays in one-pole systems.
oscillatorsEOC.lib: mainly oscillators based on band-limited impulse
trains and an excellent recursive quadrature
oscillator.
outformationEOC.lib:audio processing library containing standard and
original techniques for audio transformations.
The functions include delay-line granulators with
non-homogenous windowing, windowless granulation
through zero-crossing detection, modulations,
FDN-based processes, and time-variant transfer
functions. The library also includes dynamical
systems such as chaotic systems and cellular
automata.
stabilityEOC.lib: stability processing functions including standard
dynamics processing as well as self-regulating designs.
Coding conventions
β 80 characters per line.
β Infix syntax should be used when possible to increace conciseness.
β Spacing should be used between operands and operators to increase readability.
β Spacing should be used between operators and arguments for partial application with infix operators (see the Faust manual for a complete list of such operators).
β No spacing should be used between operators and arguments for partial application with functions.
β Spacing should be used between the first operand and the parallel composition operator (comma operator), while the second operand should be on a new line indented with the first one.
β When separating arguments, there should be no spacing between the comma and the argument on its left to distinguish it from the parallel composition operator (comma).
β The recursive composition operator and its right-operand should be on a new line and indented with the operator where the recursion is connected.