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深入分析了ＭＢＥ模型分析算法的复杂度，认为原算法中的双闭环基音搜索结构有很大的改进余地，提出了一种基于Ｂ－样条二进离散子波变换（Ｂ－ＳＤｙＷＴ）基音检测法的改进ＭＢＥ模型分析算法．其关键在于利用Ｂ－ＳＤｙＷＴ 基音检测原理将这种双闭环搜索算法改造成先开环后闭环的结构．理论分析说明，这种改造可以大幅度地降低基音搜索的复杂度，而不降低其性能．通过仿真实验对改进前、后的ＭＢＥ模型基音搜索算法的复杂度、准确度以及抗噪声能力等方面进行了全面的对比分析．得出的结论是改进算法与原算法相比各项性能均不低于原算法甚至有所改善，特别是证实了理论分析中的复杂度降低作用．
In-depth analysis of the complexity of MBE model analysis algorithm, that the original algorithm in the double closed-loop pitch search structure has much room for improvement, based on B-spline Binary Discrete Wavelet Transform (B-SDyWT) pitch detection Improved MBE Model Analysis Algorithm. The key lies in the use of B-SDyWT pitch detection principle of this double closed-loop search algorithm into a closed loop after the first open-loop structure. Theoretical analysis shows that such a transformation can significantly reduce the complexity of pitch search without degrading its performance. A comprehensive comparative analysis of the complexity, accuracy and anti-noise ability of the pitch search algorithm of MBE model before and after the improvement is made through simulation experiments. The conclusion is that the performance of the improved algorithm is not lower than that of the original algorithm even better than the original one, especially the complexity reduction in the theoretical analysis is confirmed.