Circulating Sounds

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Circulating Sounds – Deep Doppler meets mathematical socialism.

An exhibition of Tim Otto Roth at the Goethe Institut Hanoi
13.10.2017 - 03.11.2017

The Goethe Institut Hanoi will premiere two new sound installations by the German artist and composer Tim Otto Roth: aura calculata and Deep doppler.

Both installations, hanging from the ceiling above the visitor, describe a circular motion but in different ways. In aura calculata, sine tones circulate in a ring of 23 illuminated "sound pixels". The activity and the pitch of the tones are the result of a simple self-organization/neighbor rule: Each loudspeaker obeys the same rules on how to react to its neighbor's activity – the same principle driving the "wave" in a stadium. So the driving force behind this system is a kind of mathematical socialism equalizing all sound pixels. By varying the neighbor rules, the interaction interestingly can produce various spatio-temporal patterns, be it an oscillation, regular patterns or simply chaotic noise. During years of extended simulations, Roth explored the behavior of these minimalistic systems and discovered that over time some pixels are more active and others less. These tendencies are finally translated into variations in pitch and in the colors of the sound pixels, weaving a continuously changing sound carpet. Here Tim Otto Roth explores new harmonics, playing with microtonal scales such as 31-tone or 51-tone scales developed by Huygens or Mercator hundreds of years ago.

Deep Doppler circulates more physically. It consists of six translucent tubes of different lengths fixed to a hexagonal body circulating slowly above the heads of the audience. This horn-like construction permits the playing of saturated deep tones, which change their pitches slightly due to their relative motion – also described as the so-called Doppler effect. By rotation and by switching tones on and off, which can be followed by illumination, a rotating sound field is created traveling through the space and also the listener like a vibrating sound field, which might be followed by moments of local extinction of the sound. The installations play alternately.
For the premiere on 12 October, Tim Otto Roth has developed a composition for aura calculata accompanied by a live graphics projection translating the history of the system's development. Such a history of the development of hundreds of steps is also presented as a 13m-long paper strip along the longest wall of the space. In the display cases, printouts of his simulations are presented, being the source for Roth's compositions and showing the whole dynamics of these self-organizing systems.

13.10.2017 - 03.11.2017 @ Goethe-Institut Hanoi
56-58 Nguyen-Thai-Hoc-Str.
Ba Dinh

Please finde further informations on the Homepage of Goethe Institut Hanoi.