公开(公告)号：US20080069090A1

公开(公告)日：2008-03-20

申请号：US11984490

申请日：2007-11-19

申请人： Rafi Rabipour ,  Chung Chu ,  Pierre Gendron ,  William Navarro ,  Paul Boudreaux

发明人： Rafi Rabipour ,  Chung Chu ,  Pierre Gendron ,  William Navarro ,  Paul Boudreaux

IPC分类号： H04L12/66

CPC分类号： H04L12/66 ,  H04L12/6418 ,  H04L69/08 ,  H04L69/24 ,  H04L2012/6486 ,  H04M3/08 ,  H04M7/0027 ,  H04W76/12

摘要： A data communication apparatus, comprising an interface for enabling communication with a remote entity via a network and a control entity in communication with said interface. The control entity is operative to establish a packet-switched connection with the remote entity through the network and to negotiate with the remote entity using in-band signaling entry into a codec-bypass mode of operation. In this way, a codec-bypass connection, which enhances speech quality, can be established over a packet network, which reduces bandwidth.

摘要翻译： 一种数据通信装置，包括用于经由网络和与所述接口通信的控制实体与远程实体进行通信的接口。 控制实体可操作以通过网络与远程实体建立分组交换连接，并使用带内信令进入编解码器旁路操作模式与远程实体进行协商。 以这种方式，可以通过分组网络建立增强语音质量的编解码器旁路连接，从而降低带宽。

公开(公告)号：US5644679A

公开(公告)日：1997-07-01

申请号：US462209

申请日：1995-06-05

申请人： Sophie Scott ,  William Navarro

发明人： Sophie Scott ,  William Navarro

IPC分类号： G10L19/06 ,  G10L9/00

CPC分类号： G10L19/06

摘要： The input acoustic signal is subjected to high-pass filtering. The energy of the high-pass filtered signal is compared with that of the unfiltered signal in order to determine a state of the signal from among a first state for which the energy of the high-pass filtered signal is above a predetermined fraction of the energy of the unfiltered signal and a second state for which the energy of the high-pass filtered signal is below the predetermined fraction of the energy of the unfiltered signal. The high-pass filtered signal subjected to pre-emphasis of the high frequencies is addressed to the input of the coder when the signal is in its second state.

摘要翻译： 对输入声信号进行高通滤波。 将高通滤波信号的能量与未滤波信号的能量进行比较，以便确定从高通滤波信号的能量高于能量的预定分数的第一状态中的信号的状态 以及高通滤波信号的能量低于未滤波信号的能量的预定分数的第二状态。 经过高频预加重的高通滤波信号在信号处于其第二状态时寻址到编码器的输入端。

公开(公告)号：US5642465A

公开(公告)日：1997-06-24

申请号：US465263

申请日：1995-06-05

申请人： Sophie Scott ,  William Navarro

发明人： Sophie Scott ,  William Navarro

IPC分类号： G10L19/038 ,  G10L3/00

CPC分类号： G10L19/038

摘要： A speech signal digitized as successive frames is subjected to analysis-by-synthesis in order to obtain, for each frame, quantization values of synthesis parameters allowing reconstruction of an estimate of the speech signal. The analysis-by-synthesis includes short-term linear prediction of the speech signal in order to determine the quantization values of the coefficients of a short-term synthesis filter. A spectral state of the speech signal is determined from among first and second states such that the signal contains proportionally less energy at the low frequencies in the first state than in the second state, and one or the other of two modes of quantization is applied to obtain the quantization values of the coefficients of the short-term synthesis filter depending on the determined spectral state of the speech signal.

摘要翻译： 数字化为连续帧的语音信号经过综合分析，以便为每个帧获得允许重建语音信号的估计的合成参数的量化值。 综合分析包括语音信号的短期线性预测，以便确定短期合成滤波器的系数的量化值。 从第一状态和第二状态确定语音信号的频谱状态，使得信号在第一状态下的低频处比在第二状态中具有成比例地较少的能量，并且将两种量化模式中的一种或另一种应用于 根据确定的语音信号的频谱状态，获得短期合成滤波器的系数的量化值。