公开(公告)号：US20020123885A1

公开(公告)日：2002-09-05

申请号：US10084714

申请日：2002-02-25

Applicant: U.S. PHILIPS CORPORATION

Inventor： Robert J. Sluijter ,  Rakesh Taori

IPC: G10L021/00 ,  G10L019/00

CPC classification number: G10L19/04 ,  G10L19/22

Abstract: In a speech transmission system, an input speech signal is applied to a speech encoder (12, 36) for encoding the input speech signal. The encoded speech signal is transmitted via a communication channel (10) to a speech decoder (30, 48). In order to improve the performance of the transmission system in the presence of background noise, it is proposed to introduce background noise dependent processing elements in the speech encoder (12, 36) and/or in the speech decoder (30, 48) In a first embodiment of the invention, the parameters of the perceptual weighting filter (124) in the speech encoder (12, 36) are derived by calculating linear prediction coefficients (null) from a speech signal which is processed by means of a high-pass filter (82). In a second embodiment of the invention, an adaptive post filter (150) in a speech decoder (30, 48) is by-passed when the noise level exceeds a threshold value.

Abstract translation: 在语音传输系统中，输入语音信号被应用于用于编码输入语音信号的语音编码器（12,36）。 经编码的语音信号通过通信信道（10）发送到语音解码器（30,48）。 为了在背景噪声的存在下提高传输系统的性能，提出了在语音编码器（12,36）和/或语音解码器（30,48）中引入背景噪声相关处理元件。在 本发明的第一实施例中，语音编码器（12,36）中的感知加权滤波器（124）的参数是通过从通过高通滤波器处理的语音信号的线性预测系数（â） （82）。 在本发明的第二实施例中，当噪声电平超过阈值时，语音解码器（30,48）中的自适应后置滤波器（150）被旁路。