Loudspeaker equalization based on multi-location observation with reliable time-frequency region selection and its evaluation using sound propagation measurement

A new loudspeaker equalization method that is robust against listening environment and listener's movement is proposed based on a new criteria for making use of multi location measurement and reliable time-frequency region selection. The time-frequency region selection is implemented by low-pass filtering operation on an nonlinearly stretched time axis for computational efficiency. The proposed criteria for equalization is based on average energy distribution and average temporal spread of equalized multiple responses. A high-density measurement of wave propagation radiated from the loudspeaker under study was used for evaluating and demonstrating effectiveness of the proposed method.