Hierarchical Bandwidth Limitation Of Surroundsound-part Ii: Optimization Of Bandwidthrnallocation Strategy

摘要

In order to restrict the transmission bandwidth of surround sound, a technique called hierarchical bandwidth limitation (HBL) was proposed. In HBL a psychoacoustically hierarchical transform is used as the preprocessing algorithm prior to bandwidth limitation. In earlier studies it was found that the Karhunen-Loeve transform (KLT) is a suitable hierarchical transform for HBL. Besides the hierarchical transform, the choice of an appropriate strategy for bandwidth allocation is also essential from the point of view of the resultant audio quality. In order to find the optimal bandwidth allocation strategy (BAS) that achieves the best audio quality, an attempt was made to establish a mathematical relationship between audio quality and the bandwidth allocation strategy using a listening test and a regression modeling technique. The performance of HBL with the optimized BAS was also evaluated.