Conversion of predicted results to angle
Existing IACC-based measurements output the raw coefficient values as the result, which are not intuitive and can be difficult to interpret. An alternative output method that produces results on an intuitive scale, such as the width and location of the sounds as an angle, would be much more intuitive and would allow simpler and more effective analysis of the results. In view of this, the results from the binaural hearing model are converted to an angle before display.
The stage that combines the predictions of the perceived location and width outputs the results as ITD values. These are then converted to an angle by inverting the results of Kuhn [Kuhn 1977
]. This algorithm creates values for the angles of the left and right edges of the sound in each frequency band for each measurement window over time. The data are then ready for display.
As it is difficult to discern whether the sound is behind or in front from a single measurement at a single head position, the results are currently limited to a scale of ±180 degrees in front of the head. It is anticipated that research into head movement and advanced binaural capture techniques will allow this to be developed to cover the whole 360 degrees of the horizontal plane in future.