ON ACOUSTIC INFORMATION FOR MOTION

Specific details of acoustic information that support the perception o f moving sound sources are presented. The analyses demonstrate that hi gher order variables related to moving sound sources such as position, velocity, and time-to arrival are observable from conjoint measuremen t of the time-varying acoustic variables of interaural-time-delay, Dop pler shift, and average sound intensity. Motion structures the ambient acoustic array in such a way that the measured variables under consid eration sufficiently specify motion kinematics when the system of forw ard equations, combined with their first-order differentials with resp ect to time, are inverted.