Investigation Of Robust Crosstalk Cancdlation System Based On Linear Loudspeaker Array

With the rapid development of large screen television and three-dimension display technologies, increasing higher performance of the corresponding sound reproduction system is required. The sound reproduction system based on loudspeaker array has the potential to create realistic sound environment by optimizing the multi-channel input signals, thus it has attracted many researches’interest. Among all kinds of the loudspeaker arrays, linear array plays an important role in the area of scientific research and engineering, since it is very easy to be mounted on the wall behind the large display devices. One of the biggest problems faced by the binaural playback system based on loudspeaker array is crosstalk, which indicates the sound from the loudspeakers to contralateral ears. It is necessary to preprocess the binaural signals by using the crosstalk cancellation system. An excellent crosstalk cancellation system is supposed to take consideration of the sound source distribution, the frequency range of each loudspeaker, the crosstalk cancellation performance (channel separation) and the dynamic range of the system. In this paper, a crosstalk cancellation system based on linear loudspeaker array is investigated, where we concentrate on the Optimal Source Distribution (OSD) and Direct Multi-Drive Array Configuration (DMDAC) strategies.We firstly introduce the conventional method of the crosstalk cancellation system and the theory of the OSD method. Considering that the OSD method is usually realized in circular array form, which limits its practical implementation, we propose a linear mapping method to extend the OSD method into linear configuration. Accordingly, the corresponding source distribution design and frequency range discretization are investigated, which guarantees good system performance as well as the less dynamic range loss.In order to further increase the robustness of the system and mitigate the influence of the head movement, the technique of multiple control points with optimized positions on both sides of the head, as utilized in the DMDAC method, is combined into the OSD strategy. As a result, both the performance and robustness of the reproduction system improve significantly.Considering there might be another listener in the listening environment, we also investigate the sound reproduction system based on the two-rigid-sphere model. The influence of the interval between two heads of the listeners, as well as the source distribution and multiple control point strategy, is discussed. Furthermore, we propose a robust crosstalk cancellation system for the two-listener scenario and demonstrate the efficacy of this system by the simulations.