改进庞加莱截面基音检测方法研究

Improved ponicaré pitch detection methods

评述了Kubin等人提出的基于庞加莱截面的基音检测方法,指出其存在周期点筛选难、初始点选择方法不完善、要求时域波形具有明显的周期性等问题,导致其实用性不强。在此基础上,提出了变邻域和变初始点的改进算法,并与归一化互相关方法相结合,解决了上述问题。实验结果表明,改进后的基于庞加莱截面的基音检测方法具有时间分辨率高、误判率低、实用性强等优点。

After the review of speech pitch detection method based on ponicare sections proposed by Kubin, some disadvantages about the method are pointed out. For example it is hard to choose some points to calculate the periodic pitch from all the points that pass through the ponicare map, the way to choose the initial point to locate the map is not good, and the time-domain wave of the speech signal must be visibly periodic. The algorithm suggested in this paper could solve those problems by changing the neighborhood radius, adjusting the initial point, and using normalized cross-correlation method as pre-work. The improved methods are proved to have higher resolution, to be more accurate, so it is more practical.