Inverse filtering of headphones for binaural sound reproduction

In earlier projects the electroacoustic transmission from the headphone terminals to the sound pressure in the ear canals of people was investigated. It was shown that the transmission is strongly dependant on the individual and that it is important where and how the measurement is made. This investigation focuses on the decomposition of the transmission into a minimum phase, linear phase and an all-pass component. In order to make a binaural reproduction acoustically transparent, the system must be inverse-filtered with respect to all three these components. The stability of the inverse filtering with respect to individual differences and changes of headphone and microphone placements were investigated.