Scalable encoding device and scalable encoding method

Increasing the conversion performance from a narrow-band LSP wideband LSP, scalable encoding device capable of realizing high performance band scalable LSP encoding a. In this apparatus, the autocorrelation coefficient conversion section 301 converts the narrowband LSP of Mn order to an autocorrelation coefficients of Mn order and station the time window (Lag Window) unit 302, which takes the autocorrelation coefficients under the time window of the Station Properties window (reverse time window), the extrapolation section 303 is subjected to the extrapolation process for the autocorrelation coefficients in reverse time window hanging and expand car-order the (Mn + Mi) of the autocorrelation coefficients up sample parts 304, (Mn + Mi) performs the up sample processing of the up sample processing equivalent to the autocorrelation domain in the time domain for the autocorrelation coefficients in order to save the autocorrelation coefficients of Mw order, time window portion 305 is , under the time window for the autocorrelation coefficients of Mw order, LSP converting section 306 converts an auto-correlation coefficient time window is hung by LSP.