Dis-Chorde

intersection

Dis-Chorde

by Alvaro Cassinelli, Philippe Chatelain and Daito Manabe (2007)

Dis-chorde is a tangible audio-visual interface through which a single individual can control a matrix of 64 audio/video channels as if directing a real human chorus – but with an extreme precise control of each of the performers “parameters”.

The content of each channel can be different, but here we were more interested on the possiblity to construct complex audio-visual experiences using a single audio/visual “seed” (granular or “cellular video” synthesis, as explored in previous expriments, see video below).

cellular video

venndiagram64
vol We tried both a singing sequence and prose (the later is left for further experimentation, as it is an extremely rich area to explore, related to generative litterature…).

The interest of this highly spatial interaction paradigm (with respect to a normal sequencer) resides in the fact that the pressure on the (deformable) screen will:

  • affect the speed (fps) of a video channel, and also the pitch of the audio signal;
  • influence parameters of channels in a local neighborhood around the site of pressure.

That means that as the user presses the screen, overlapping areas of pressure are formed; these are spatial interference patterns both visible as “waves” on the video matrix, but also audible (the more video channels are in perfect synch, the lowder the playback; inversely, the more uncorrelated (phase/speed), the less audible). This creates spatial and temporal “rythms” that can be precisely controlled by the user (additional controls are possible using a keyboard or midi-controller, for instance to “reset” the matrix, choose to modify speed or phase, etc).

The system was designed by modifying the Khronos Projector interface, adding OSC over ethernet control, and generating the sound on MAX/MSP.

Exhibition history:

  • Museum of Contemporary Art Tokyo (MOT), 29 May 2007. Video extract [wmv-13MB] (simplified setup using a touch-screen, see image on the right).

Credits:

  • Alvaro Cassinelli: concept, software and hardware development.
  • Philippe Chatelain: video and audio content, performer.
  • Daito Manabe: sound programming
setupMOT