On Acoustic Information for Motion

Specific details of acoustic information that support the perception of moving sound sources are presented. The analyses demonstrate that higher order variables related to moving sound sources such as position, velocity, and time-to-arrival are observable from conjoint measurement of the time-varying acoustic variables of interaural-time delay, Doppler shift, and average sound intensity. Motion structures the ambient acoustic array in such a way that the measured variables under consideration sufficiently specify motion kinematics when the system of forward equations, combined with their first-order differentials with respect to time, are inverted.