Stack filtering and smoothing to pitch contrail of Chinese speech
Dongsheng Zhang · Ha'erbin gongye daxue xuebao · 2008
For the sake of getting more accurate pitch period,a method of stack filtering and smoothing was investigated.The pitch is the vocal vibratile periodicity of voiced speech,the reciprocal of vocal vibratile frequency is the pitch period.It is important to get accurate pitch period in speech signal processing,and the detection of pitch period is important for the synthesis,coding and recognition of speech.Based on the characteristic of speech signals,a new stack filtering algorithm is proposed and a new stack filter with suitable structuring elements is designed to get the preferable accurate pitch contrail of speech signals.Simulation results show that this new approach is better than the combination filter based on the median filter and linear filter on the stochastic incorrect value,and furthermore,it has been proved that the stack filter is feasible for the speech signal research.