audio signal processing with pure data.
asp workshop organised by so-on
monday july 11, 2005
The ASP Introduction workshop from goto10 and hosted by okno.be intends to introduce the students to the basics of Audio Signal Processing in the fields of realtime music production. The workshop is specifically made for people willing to develop their work in the digital sound field and for people curious about the processes involved behind audio software they already use. The workshop will also teach and demonstrate which free technologies are available for audio and video streaming. The workshop will end with an open placard event (headphone live festival - more infos soon).
ASP and Audio Synthesis Audio processing is the manipulation, either measurement or filtering, of an analog (voltage level) or digital (binary numbers) representation of sound. In the Digital Signal Processing field, this implies the conversion of the signal from an analog to a digital one and vice versa with a focus on one particular domain (time, space, frequency,...).
Audio Synthesis is the art of producing artificially generated sounds using various techniques. This creation can be done either in the analog world (current manipulation) or digital world (discrete values manipulation).
1. understanding the physical sound
1.1 the phenomenon of sound
1.2 perceived qualities (duration, pitch, loudness) of sound
1.3 quantitative measurements (time, frequency, amplitude) of such qualities
2. understanding the digital representation of physical sound
2.1 basic sampling theory
2.2 ADC & DAC
2.3 binary numbers
3. basic audio signal processing
3.1 adding signals
3.2 multiplying signals
4.1 simple FM
4.2 simple wavetable
4.3 simple granular
5.1 different soundfiles
5.2 loss vs. lossless compression
PD (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical processing. It is the third major branch of the family of patcher programming languages known as Max (Max/FTS, ISPW Max, Max/MSP, jMax, etc.) originally developed by Miller Puckette and company at IRCAM. The core of Pd is written and maintained by Miller Puckette and includes the work of many developers, making the whole package very much a community effort.
It's hard to describe the possibilities of such an environment as its field of creation is almost infinite. From audio processing, to video, 2D/3D, interactivity, on-line experimentation, streaming and sensors, Pure-Data can handle all of these and provide a rock stable system which is perfect for performances and installations of any kind.
1. messages vs. audio signals
1.1 how audio signal differs from message signal
1.2 how to see audio signals
2. audio building blocks and operators
2.2 [+~], [-~] and others
2.3 ramping and envelopes
3. delay & filters
3.1 introducing delay
3.2 various types of filters
4. let's make
4.1 a FM patch
4.2 a sample playing patch
4.3 an effect patch
The aim of My First Packet is to provide graphical high-level modules dedicated to quickly build an audio/video mixing and streaming platform on linux and eventually OSX. MFP works like a high level and friendly environment built on top of PD, PDP and PiDiP.
- what is an abstraction
- presentation of the different possibilities
- presentation of Open Sound Control
- presentation of icecast, ogg, vorbis, and theora
- building an audio and video streaming system
DAY 1 12h-19h // chun lee [tw/uk] + aymeric mansoux [f/nl]
| ASP and Audio Synthesis
| one day with the blackboard ...
DAY 2 12h-19h // chun lee [tw/uk] + aymeric mansoux [f/nl]
| Pure Data
| Applied theory and osc~ fun
DAY 3 12h-19h // chun lee [tw/uk] + aymeric mansoux [f/nl]
| let's connect and stream
DAY 4 14h-2h
| GOTO10/OKNO placard // headphone festival // more infos soon.
:DATE: JULY 11th-14th 2005
:FEE: 60 euros
:LOCATION: OKNO brussels 1080 - koolmijnenkaai 30/34 quai aux charbonnages
:FOOD&DRINKS: free tea+coffee - softdrinks 1€
:HOUSING: not included
:HARDWARE: bring your own laptop