These Bells are Physical Sonifications of the Head Related Transfer Functions (HRTF) measured from a Kemar Dummy Head. They were made in response to György Wersényi’s sonification challenge for the ICAD 2011 Conference in Budapest. The HRTF dataset is a spatial array of spectral filters measured from the left and right ears of a dummy head.

HRTF Bells

The construction of the bells is described in this paper presented at the ICAD 2011 conference in Budapest.

The Left and Right Bells sound different from each other, and from the template Control Bell.

Spectrograms of the Left and Right Bells show the superposition of doubled harmonics that causes timbral differences and dissonance. It is not easy to see any difference in the shape of these two datasets consisting of 100K data points but can be heard immediately when they are rung. This immediately audible difference suggests that the Bell could characterize an entire dataset in a way that could be useful for classification and recognition of HRTF datasets.

The HRTF Bells are currently being shown in the Creative Practice exhibition curated by Diane Firth at the Belconnen Arts Centre in Canberra from 22 July – 7 August 2011.

These physical sonification data forms can be ordered online from at this URL