Three dimensional sound simulation using DSP techniques

A method for generating three-dimensional sonic images is investigated. The method uses the point-in-space-to-ear-canal transfer functions. These transfer functions were measured by placing a reference microphone at a point in space, placing microphones in the ears of a subject and measuring the two transfer functions, one between the left ear and the reference microphone and the other between the right ear and the reference microphone. The transfer functions were then convolved with a mono signal which produced two signals, one for the left ear and one for the right ear. These signals were then presented to a subject over headphones for evaluation of the three-dimensional effect