METHOD AND APPARATUS FOR JUDGING PITCH ACCORDING TO FREQUENCY ANALYSIS

摘要

PURPOSE: A method and an apparatus for judging a pitch according to frequency analysis are provided to judge whether a maximum peak frequency obtained through frequency analysis is a pitch or a harmonic frequency corresponding to n times of the pitch to determine the pitch according to the judged result. CONSTITUTION: A digital signal inputted from the outside is decomposed into frequency components by predetermined time units(S100), and peak positions of the signal are detected according to the frequency component values(S200). It is judged whether the frequency at the maximum peak position among the peak positions is a pitch or a harmonic frequency corresponding to n times of the pitch, and the pitch is determined according to the judged result(S300). The range of the pitch is decided on the basis of the range of the harmonic frequency of the detected pitch(S400).