Commit c39c0626 authored by Jens-Christian Fischer's avatar Jens-Christian Fischer
Browse files

Merge branch 'master' of gitlab.switch.ch:grains/grains-presentation

parents b1448cfd c525e2f8
......@@ -110,31 +110,191 @@ Additive
* 1822 Joseph Fourier showed that some functions can be written as a sum of sines
* Using harmonics we can build up a variety of timbres
* Theoretically we could use arbitrary many sines to reconstruct almost all sounds
----
:data-x: r0
:data-y: r500
:data-scale: 0.1
Harmonics
=========
.. image:: img/harmonics.png
:height: 150px
:height: 500px
:align: right
* Theoretically we could use arbitrary many sines to reconstruct almost all sounds
* Practically this is impossible
----
Contra
======
* Gets ressource intensive very fast
* Sound is often too clean, to sterile
* Its not easy to find good sounds, without FFT
----
:data-x: r0
:data-y: r500
:data-scale: 0.1
Saw Wave
========
.. image:: img/sawtooth.png
:height: 350px
:align: right
----
Basic Flowchart
===============
.. image:: img/atom.svg
:height: 500px
:align: center
----
Envelopes
=========
* eternal sound vs defined notes
* most common ist ADSR (attack - delay - sustain - release)
.. image:: img/envelope.svg
:height: 400px
:align: right
----
Combined Flowchart
==================
.. image:: img/env_osc.svg
:height: 450px
:align: right
----
Subtractive
===========
* Source with a broad spectrum -> noise
* Filter too thin out spectrum
* Gives much more "natural" sound than additive synthesis
* Restricted in what is possible
* Needs lots of experience
* Used in a lot of analog synthesizer
* More "natural" sound
* Modular analog synthesizer
* Needs good filters
----
Frequency Modulation
====================
* Modulate frequency inlet with an other oscilator
* 1973 John Chowning
* Multiple oscilators can be arbitraily combined to fm each other
* Lots of possibilities
* Difficult to find a specific sound
----
FM Spectrum
===========
Additional bands appear
.. image:: img/FM.png
:height: 350px
:align: right
----
Yamaha DX7
=========================
* Uses 6 sine oscilators
* In 32 combinations
.. image:: img/DX7.png
:height: 350px
:align: right
----
Amplitude Modulation
====================
* Works similar to FM, but uses amplitude slot
* doesn't have the rich possibilities of FM
----
Physical Modeling
=================
* Best known is Karplus-Strong
* Uses Delaylines
* Simulates Strings and Flutes, both of which base on sine waves reflected back at the boundary
* Various Oscilators are used Van-der-Poole, Chua or strange attractors like Henon, Lorentz
* Chaotic Phenomena in general
----
Granular Synthesis
==================
* also a physical model
* Denis Gabor 1947 : Acoustical quanta and the theory of hearing
* Based on grains or wave packages
* Analog to photons for light, proposed quanta for sound
* Psychoaccoustic : ear like the eye has resolution limits, granular synthesis plays with this
----
A grain
=======
.. image:: img/truax.gif
:height: 200px
:align: right
Has a source wave (with its own frequency), wraped in an envelope.
Both have various parameter that can be changed and influence the timbre.
----
Heaps of grains
===============
There is seldomly one grain, but mostly lots of grains.
How dense, homogenous, etc. this grain clouds are changes the timbre and the way we perceive the sound.
----
Pioneers of Granular Synthesis
==============================
* Curtis Roads : Microsound
* Iannis Xenakis
* Trevor Whishart
* B Truax
* Brandtsegg, Saue, Johansen : Partikkel Opcode in CSound
----
CSound
======
----
History
......@@ -142,10 +302,7 @@ History
* 1957 first computer sound synthesis at Bell Labs by Max Mathews -> MUSIC I
* Until 1970s MUSIC 11 by Barry Vercoe
* Around 1986 Barry Vercoe wrote the first CSound based on C
* CSound constantly incorporates new ideas like
* MIDI / OSC for performances
* GUI - System for controllers
* Python for Live Coding
* CSound constantly incorporates new ideas
----
......@@ -179,6 +336,11 @@ Freeware
* Pure Data
* Supercollider
Commercial
----------
* Max/MSP
----
:data-scale: 1
......
img/DX7.png

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