公开(公告)号：US5893056A

公开(公告)日：1999-04-06

申请号：US839830

申请日：1997-04-17

申请人： Madeleine Saikaly ,  Rafi Rabipour

发明人： Madeleine Saikaly ,  Rafi Rabipour

IPC分类号： G10L19/00 ,  G10L19/06 ,  H04B3/20 ,  G10L9/00

CPC分类号： G10L19/012 ,  H04B3/20 ,  G10L19/06

摘要： In methods and apparatus for generating an LPC-encoded noise signal from an LPC-encoded speech signal, excitation parameters of the LPC-encoded speech signal for a current frame are randomized upon detection of speech in the current frame. For frames in which no speech is detected, LPC coefficients and frame energy for the current frame may be replaced with respective averages calculated over the current frame and a plurality of preceding frames. For frames in which speech is detected, LPC coefficients for the current frame may be replaced with respective averages of LPC coefficients used to replace LPC coefficients of an immediately previous frame. The comfort noise generation technique is particularly suitable for use in echo suppressors for digital cellular radio systems.

摘要翻译： 在用于从LPC编码的语音信号产生LPC编码的噪声信号的方法和装置中，当前帧的LPC编码语音信号的激励参数在检测到语音时被随机化。 对于其中没有检测到语音的帧，可以用当前帧和多个先前帧计算的相应平均值替换当前帧的LPC系数和帧能量。 对于其中检测到语音的帧，可以用用于替换紧接在前的帧的LPC系数的LPC系数的相应平均值来替换当前帧的LPC系数。 舒适噪声产生技术特别适用于数字蜂窝无线电系统的回波抑制器。

公开(公告)号：US6011846A

公开(公告)日：2000-01-04

申请号：US881062

申请日：1997-06-24

申请人： Rafi Rabipour ,  Dominic Ho ,  Majid Foodeei ,  Madeleine Saikaly

发明人： Rafi Rabipour ,  Dominic Ho ,  Majid Foodeei ,  Madeleine Saikaly

IPC分类号： G10L21/02 ,  H04B3/20 ,  H04B7/015 ,  G10L9/00

CPC分类号： H04B7/015 ,  H04B3/20 ,  G10L2021/02082

摘要： In methods and apparatus for suppressing echo of a far end signal encoded using LPC-based compression in a near end signal encoded using LPC-based compression, parameters of each frame of the near end encoded signal are processed without synthesizing a speech signal from the near end encoded signal to determine whether sufficient echo to merit echo suppression is present in the frame. Upon determining that insufficient echo to merit echo suppression is present in the frame, the parameters of the frame are passed unmodified. Upon determining that sufficient echo to merit echo suppression is present in said frame, the parameters of the frame are modified without synthesizing a speech signal to suppress echo in the frame. The methods and apparatus are particularly suitable in codec bypass applications.

摘要翻译： 在使用基于LPC的压缩编码的近端信号中抑制使用基于LPC的压缩编码的远端信号的回波的方法和装置中，处理近端编码信号的每帧的参数，而不从近端 结束编码信号以确定帧中是否存在足以有效回波抑制的回波。 在确定帧中存在不足以获得回波抑制的回波的情况下，帧的参数未被修改。 在确定在所述帧中存在足够的回波以获得回波抑制的情况下，修改帧的参数而不合成语音信号以抑制帧中的回波。 该方法和装置特别适用于编解码器旁路应用。