利用在过渡频率之交叉滤波器之编码音频讯号之解码装置与方法;APPARATUS AND METHOD FOR DECODING AN ENCODED AUDIO SIGNAL USING A CROSS-OVER FILTER AROUND A TRANSITION FREQUENCY

摘要

一种解码编码音源讯号装置，该编码音源讯号包含一编码核心讯号(1)，该装置包含：一核心解码器(1400)，系用以解码该核心讯号(1401)，以取得一解码核心讯号；一平铺产生器(1404)，系用以使用该解码核心讯号之一频谱部分，以产生至少一频谱平铺，该至少一频谱平铺具有不包含于该解码核心讯号之复数个频率；以及一交越滤波器(1406)，系用以对解码核心讯号以及一第一频率平铺作频谱上交越滤波，或是对于一第一频率平铺以及一第二频率平铺作频谱上交越滤波，且该第一频率平铺系具有从一间隙填充频率(309)延伸至一上边界频率之复数个频率。; a tile generator (1404) for generating one or more spectral tiles having frequencies not included in the decoded core signal using a spectral portion of the decoded core signal; and a cross-over filter (1406) for spectrally cross-over filtering the decoded core signal and a first frequency tile having frequencies extending from a gap filling frequency (309) to an upper border frequency or for spectrally cross-over filtering a first frequency tile and a second frequency tile.