Method and apparatus for pitch search

A method for pitch search, comprising:

• searching the input speech signals for a pulse with the maximum amplitude;
• setting a target window for the input speech signals according to the position of the pulse;
• sliding the target window to obtain a plurality of sliding windows, calculating the correlation coefficient of the input speech signals in each sliding window and in the target window to obtain the maximum value of the correlation coefficients;
• and
• obtaining a pitch according to the maximum value of the correlation coefficients.

An apparatus for pitch search, comprising:

• a searching module, adapted to search the input speech signals for a pulse with the maximum amplitude;
• a target window module, adapted to set a target window for the input speech signals according to the position of the pulse with the maximum amplitude;
• a calculating module, adapted to slide the target window and calculate the correlation coefficient of the input speech signals in each sliding window and in the target window to obtain the maximum value of the correlation coefficients;
• and
• a pitch obtaining module, adapted to obtain a pitch according to the maximum value of the correlation coefficients.