| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device for performing pitch search without calculating a correlation function value of an input speech signal in an entire frame. SOLUTION: One method includes the steps of: obtaining a characteristic function value of a residual signal, where the residual signal is a result of having removed a Long-Term Prediction (LTP) contribution signal from input speech signals; and obtaining a pitch according to the characteristic function value of the residual signal. The other method for the pitch search includes the steps of: searching a pulse of a maximum amplitude in the input speech signal; setting a target window for the input speech signal according to a position of the pulse of the maximum amplitude; obtaining the maximum value of the correlation coefficient by calculating the correlation coefficient of the input speech signals in a sliding window and the target window, by obtaining the sliding window by sliding the target window; and obtaining the pitch on the basis of the maximum value of the correlation coefficient. COPYRIGHT: (C)2010,JPO&INPIT
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