Design and validation on a multiple sound source fast-measurement system of near-field head-related transfer functions

Near-field head-related transfer functions （HRTFs） are essential to scientific re- searches of binaural hearing and practical applications of virtual auditory display. High ef- ficiency, accuracy and repeatability are required in a near-field HRTF measurement. Hence, there is no reference which intents on solving the measuring difficulties of near-field HRTF for human subjects. In present work, an efficient near-field HRTF measurement system based on computer control is designed and implemented, and a fast calibration method for the system is proposed to first solve the measurement of near-field HRTF for human subjects. The efficiency of measurement is enhanced by a comprehensive design on the acoustic, electronic and mechanical parts of the system. And the accuracy and repeatability of the measurement are greatly im- proved by carefully calibrating the positions of sound source, subject and binaural microphones. This system is suitable for near-field HRTF measurement at various source distances within 1.0 m, for both human subject and artificial head. The time costs of HRTF measurement at a single sound source distance and full directions has been reduced to less than 20 minutes. The measurement results indicate that the accuracy of the system satisfies the actual requirements. The system is applicable to scientific research and can be used to establish an individualized near-field HRTF database for human subjects.

Design and verification of a transfer path optimization method

This paper studies the transfer path planning problem for safe transfer of an aircraft on the aircraft carrier flight deck under a poor visibility condition or at night.First,we analyze the transfer path planning problem for carrier-based aircraft on the flight deck,and define the objective to be optimized and the constraints to be met.Second,to solve this problem,the mathematical support models for the flight deck,carrier aircraft entity,entity extension,entity posture,entity conflict detection,and path smoothing are established,as they provide the necessary basis for transfer path planning of the aircraft on the aircraft carrier.Third,to enable automatic transfer path planning,we design a multi-habitat parallel chaos algorithm(called KCMPSO),and use it as the optimization method for transfer path planning.Finally,we take the Kuznetsov aircraft carrier as a verification example,and conduct simulations.The simulation results show that compared with particle swarm optimization,this method can solve the transfer path planning problem for an aircraft on the aircraft carrier flight deck better.