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Daisuke Ishida

Die akustische Erforschung des Raums Nr.1 (2011)

Die akustische Erforschung des Raumes Nr.1 (2011)

A room’s dimensions and materiality have influence on sound governed by the laws of physics. A sound reflects, diffuses, refracts, diffracts and is absorbed by the individuality of the room. Room acoustics are often measured by Impulse Response, which excites a space to obtain the response data of the room. The result of the response is meant to be used as a guidance for designing a building, for comparing rooms and it enables the reproduction of the acoustic model of the room in the virtual domain through a mathematical convolution operation. The measurement reveals the acoustic characteristics of the room, which are rarely experienceable on a daily basis through the full audible spectrum of sounds of equal energetic level, nor singularly through specific frequencies. Generally, sound has a direction and an emission angle which depend on the features of a loudspeaker, the structure of a sounding object and the frequency of the sound. The methodology of the Impulse Response though does not record any directional information from the source.

One aspect of my motivation for this work is to respect the essence of space. Rather than the english term though, I prefer to use the broader german term der Raum which does not distinguish between room or space. Every room, either manmade or natural, has its own characteristics which may have a varying impact on a person within the space.

Die Akustische Erforschung des Raumes Nr.1 is an installation which allows the spectator to experience the audible character of a room by means of a modified acoustic measurement method. In order to modify the procedure of the Impulse Response, I appointed the two most relevant aspects of it, which are the impulse-like sound and the swept sine wave. I decided to combine these. As a result the short sound of the sine wave will be triggered by a rhythm with the repeating sweep line as a guidance of the frequency value. The room will be excited with a rotating source emitting short sine waves. Each variously directed sine wave consists of only one frequency, so that the specific response spectrum of the room can be heard. At some case of sound parameter settings, the sound may be perceived as a pattern, each of the sounds will be difficult to distinguish from one another. Depending on the number of sine cycles and triggering rate, a sound may be triggered before the last sound ends. They may overlap on the time axis. This installation is a universal medium to reveal the acoustic character of a room and is meant to allow exploration of multiple spaces. Therefore room number 19 at Homebase Berlin is case number one.

Technical support: Kathrin Scheidt and Wilm Thoben