An Approach of Fundamental Frequencies Smoothing for Chinese Tone Recognition
Zhu Qiang Xiao · Zhongwen xinxi xuebao · 2001
Mandarin is a tonal language.The tones are recognized by using the pitch contour information which can be expressed by fundamental frequencies.The classic approaches for fundamental frequencies smoothing,such as linear smoothing,median smoothing and linear interpolation,can not work well in the case of that fundamental frequency is not detected correctly and several continulus frames.In this paper,a new smoothin approach is presented,in which a searching method is used to get a preferable accurate pitch contour.This approach is characterized by its simple,reliable and fast performance.Experimental results show that the new approach can decrease the recognition error rate by 40%.