A METHOD AND APPARATUS FOR ADAPTIVE SUB-BAND ALLOCATION OF SPECTRAL COEFFICIENTS

摘要

PURPOSE: A method and an apparatus for adaptive sub-band allocation of spectral coefficients are provided to implement accurate quantization which uses a short sub-band by performing the quantization of a sub-band unit. CONSTITUTION: A short sub bandwidth permission decider(131) determines the usage of a short sub band from an audio signal, and a bandwidth allocation unit(132) allocate a converted spectrum coefficient. A sub bandwidth type decider(133) sets up the usage of a long or short sub bandwidth in each band according to the distribution of spectrum coefficients. When the size of the sub band is determined, a sub bandwidth allocation unit(134) allocates the spectrum coefficient of each band is allocated to each sub band.