A Study on the Noise-Level Measurement Using the Energy and Relation of Closed Pitch

에너지와 인근 피치간에 유사도를 이용한 잡음레벨 검출에 관한 연구

Human has average pitch-level when speak naturally. That is 'Habitual pitch level'. However, if noise added at speech, the pitch-wave is changed irregularly. We can estimate noise level of speech by using this point. This paper calculates energy level of the input speech, pitch period from of above limited energy level by NAMDF (Normalized Average Magnitude Difference Function) method, after cut each frame by pitch period unit, and propose a method that estimate noise level through closed pitch of input speech.