Evaluation of Optimal Hierarchical Bandwidth Limitation Method
A listening test was conducted to evaluate the performance of the optimised KLT-based HBL algorithm by comparing it with other bandwidth limitation algorithms, Baseline (Base), Quality Advisor (QA), MSBTF-based HBL. The results showed (see Figure 1) that the hierarchical bandwidth limitation based on MSBTF transforms could be used as an effective preprocessing method prior to reduction of bandwidth to save the overall bandwidth of surround sound without significant quality degradation. The KLT-based HBL with the optimal bandwidth allocation strategy was superior compared to the other traditional bandwidth limitation algorithms used for the limitation of bandwidth of multichannel sound.
Figure 1: Basic Audio Quality of different bandwidth limitation algorithms