公开(公告)号：US20040098255A1

公开(公告)日：2004-05-20

申请号：US10294923

申请日：2002-11-14

Applicant: France Telecom ,  Conexant Systems, Inc.

Inventor： Balazs Kovesi ,  Dominique Massaloux ,  Claude Lamblin ,  Yang Gao

IPC: G10L019/10 ,  G10L019/04 ,  G10L019/08

CPC classification number: G10L19/13

Abstract: An improved EX-CELP or RCELP encoding scheme is proposed, in which, at the encoder side, a speech signal is perceptually weighted signal prior to entering a time scale modification module, then the modified signal is transformed into another domain, such as the speech or LP short-term residual domain, using the corresponding inverse filtering operation directly or possibly combined with another processing, for instance a short-term LP filtering. A shift function is calculated in the time scale modification process to associate the position of each sample in the modified signal with its original position before the modification. The positions of the samples in the modified signal that correspond to sub-frame boundaries of the original signal are evaluated to switch filters for the inverse filtering at the appropriate instants. Therefore, the synchronization between the inverse filters and the modified signal is maintained.

Abstract translation: 提出了一种改进的EX-CELP或RCELP编码方案，其中在编码器侧，在输入时标修改模块之前，语音信号是感知加权信号，然后将修改的信号转换成另一个域，例如语音 或LP短期残留域，使用相应的逆滤波操作直接或可能与另一处理组合，例如短期LP滤波。 在时间刻度修改处理中计算移位函数，以将修改信号中的每个样本的位置与修改前的原始位置相关联。 对与原始信号的子帧边界对应的修改信号中的样本的位置进行评估，以在适当的时刻切换用于逆滤波的滤波器。 因此，维持逆滤波器与修正信号之间的同步。