| 摘要 |
PROBLEM TO BE SOLVED: To provide AbS (Analysis by Synthesis) coding technology which has excellent sound quality even with a low bit rate. SOLUTION: One embodiment includes the steps of: dividing a sample of a speech signal into frames; classifying the frame into either a silent frame or a non-silent frame, and then classifying the non-silence frame into a voice frame and a transit frame; deriving a residual signal of each frame by using a linear prediction filter; determining a position of at least one window which has a center existing in a frame range, by considering an energy profile of the residual signal of the frame; and coding an excitation signal of the frame so that all or most of non-zero excitation amplitudes may exist within a range of the at least one window by using AbS coding, based on the determined position of at least one window, and the classification regarding the frame. COPYRIGHT: (C)2011,JPO&INPIT
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