Two stage variable parameter filter time-delay correction approach to acoustic source direction

In the filed of human-robot interaction,Video conference and Military defense,the sound source direction system based on microphone array has already been getting increasing attention.Time-delay estimation point can show a large deviation when both spatial noise and reverberation exist,while the calculation of sound source angle relays on the accurance of time-delay estimation.Therefore,In this paper,we reported on time-delay correction approach used for acoustic source direction based on double microphones model.a two stage variable weighting coefficient filter is used to correct the time-delay point estimated by GCC-PHAT-ργ in algorithm,effectively making bigger deviation time-delay point return to the correct time delay group, thus avoiding impairing further angle estimation caused by wrong time-delay. As the results show,the proposed approach shows a very good perfomance in error average and RMSE without the decrease of sample qualities.It takes less time to locate the positon of angle for each data. Theory analysis and simulation results are provided to show that the proposed algorithm not only improve the estimation precision of angle,but also can track timely the direction of acoustic source when the speaker is moving at normal speed.