| 摘要 |
PURPOSE: To unnecessitate a memory by which plural noise excitation sources are stored by selecting a noise excitation source with less quantity of arithmetic processing. CONSTITUTION: In a voice prediction coding method by which a voice is coded utilizing reproducing a voice by driving a synthetic filter 4 of which a quantized filter coefficient calculated based on sampling of plural input voices is set per frame unit by a time series vector component outputted from two excitation sources of a pitch excitation source 11 expressing a pitch component and a noise excitation source 31 expressing a noise component, a frame is further divided into plural sub-frames, the noise excitation source 31 is expressed by making a pulse for each sub-frame, and a position and amplitude of this pulse is quantized and coded for each sub-frame. |
