Greger Stolt Nilsen


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Untitled (2011)

Commissioned work for music technology at NTNU

Materials

Generative digital graphics printed on acrylics.
6 prints, 134 cm by 150 cm
4 prints, 67 cm by 150 cm

Technique

Sound recordings were processed in scripts written in Processing and graphics were generated and rendered to PDF files that were printed on acrylics. Content Microphones were placed at the locations where the prints were planned to hang, and ambient noise was recorded. Graphics were then generated according to some custom defined rules.

Two or four channels of sound, depending on the location, from the same time span were loaded into the program. Each channel was designated its own colour, from a palette of four. And each print has its main channel. The sounds were fast fourier transformed, grouping frequencies by octave, into 8 octaves. The main channel for a print is then drawn with a curves function, several times, layering thin semi-transparent lines, with some randomly added offset in each control point. The lowest octave is at the top, and time goes from right to left.

All octaves of all sound channels are also compared to each other across time, and at every point in time where one channel's octaves level crosses another, a "collision" is detected. The collisions are drawn over the curves as circles filled with the colour that represents the sound channel that it is colliding with. Black straight lines are also drawn between every collision point.

The scale of the prints are based on a little less than the average walking speed of a human#, about 1.34 meters per second. The large prints then show one second of sound, and the smaller ones, half a second.