An environment adaptive loudspeaker calibration method for Ambisonics decoding system

In the Ambisonics decoding system, the non-evenly placement of loudspeakers, the non-identical characters of each sound playing channel and the reverberation of the listening room will destroy the spatial perception of the virtual sound. In this paper, an environment adaptive loudspeaker calibration method is proposed for accurately reproducing the sound field by using the Ambisonics system. The transfer function from loudspeaker to the listener position is measured by using the MLS signal firstly, then its reverse function is estimated by the least square algorithm. Finally, the decoded signals calculated by Ambisonics are convolved with the inverse transfer function to generate the signals for the loudspeakers. The subjective experiments based on the MUSHRA method were carried out to evaluate the proposed system. The results showed that the proposed system is significantly better than the baseline system.