Patent ID: 6564182
Filing Date: 2003-05-13
Classification: G10L

Abstract:
A method of pitch determination for a speech signal, said speech signal having a plurality of frames, each of said plurality of frames having a first subframe and a second subframe, said plurality of frames including a present frame, a previous frame, and a subsequent frame, wherein said present frame is between said previous frame and said subsequent frame, wherein a first subframe of said present frame is a look-ahead subframe of said previous frame, and wherein a first subframe of said subsequent frame is a look-ahead subframe of said present frame, said method comprising the steps of:calculating a look-ahead pitch of said look-ahead subframe of said present frame; storing said look-ahead pitch of said look-ahead subframe of said present frame to be retrieved for calculating a pitch of a second subframe of said subsequent frame; retrieving a look-ahead pitch of said look-ahead subframe of said previous frame; and using said look-ahead pitch of said look-ahead subframe of said previous frame and said look-ahead pitch of said look-ahead subframe of said present frame to determine a pitch of said second subframe of said present frame; wherein said steps of calculating, storing, retrieving and using are repeated for each of said plurality of frames.