关键词: 随机森林, 先进音视频编码标准第10部分（AVS-P10）, 模式选择, 特征选择, 信号分类

Abstract: AVS-P10 is Chinese first mobile audio codec standard. To solve the problem of low quality because of low accuracy in open-loop mode selection of the standard, this paper proposes an open-loop mode selection method based on random forest which regards closed-loop mode choice as the benchmark to improve mode selection accuracy of open-loop mode. To keep low computational complexity and high accuracy, the scale of random forest is reduced by two-step feature selection algorithm. Both of the results of objective and subjective testing show that the accuracy rate of mode selection increases dramatically. The quality of audio encoded by the open-loop selection using this method is much better than that by open-loop selection of AVS-P10 and is almost same as that by close-loop selection.

Key words: random forest, Audio Video coding Standard-Part 10（AVS-P10）, mode selection, feature selection, signal classification