公开(公告)号：US20090003570A1

公开(公告)日：2009-01-01

申请号：US11819171

申请日：2007-06-26

申请人： Manoj Sindhwani ,  Piyush Shankerbhai Patel

发明人： Manoj Sindhwani ,  Piyush Shankerbhai Patel

IPC分类号： H04M1/00 ,  H04L12/16

CPC分类号： H04L65/1069 ,  H04L65/103 ,  H04L69/24 ,  H04M7/0072 ,  H04M7/124 ,  H04W28/18 ,  H04W88/181

摘要： In a method, system and apparatus for providing an endpoint-to-endpoint transcoding free connection, a customer premises equipment (CPE) at a first or second endpoint encodes and decodes voice data received from and sent to a respective one of first and second media gateways according to an initial codec type. The first and second media gateways perform a Transcoding Free Operation (TFO) negotiation to determine if there is a common codec type among the first and second media gateways and first and second endpoints. If such a common codec type is determined, the first and second media gateways switch from encoding voice data according to the initial codec type to the common codec type and send an indication of the switch to the respective one of the first and second endpoints.

摘要翻译： 在用于提供端点到端点转码自由连接的系统和装置中，第一或第二端点处的客户驻地设备（CPE）对从第一和第二媒体中的相应一个接收的语音数据进行编码和解码 网关根据初始编解码器类型。 第一和第二媒体网关执行无转码自由操作（TFO）协商，以确定在第一和第二媒体网关以及第一和第二端点之间是否存在公共编解码器类型。 如果确定了这样的通用编解码器类型，则第一和第二媒体网关根据初始编解码器类型从编码语音数据切换到公共编解码器类型，并且将交换机的指示发送到第一和第二端点中的相应一个。

公开(公告)号：US06795405B1

公开(公告)日：2004-09-21

申请号：US09472031

申请日：1999-12-27

申请人： Zoran Mladenovic ,  Piyush Shankerbhai Patel

发明人： Zoran Mladenovic ,  Piyush Shankerbhai Patel

IPC分类号： H04B323

CPC分类号： H04L5/14 ,  H04B3/23 ,  H04L25/4927

摘要： A modem-based echo cancellation enhancement for digital communications networks is provided. The effects on echo cancellation of non-linearity in a far end echo path in a digital telephone system are reduced by introduction of non-linearities into the near end signal prior to generation of the echo cancellation signal. Near end signal is sampled after linear to PCM conversion. A PCM to linear conversion is added prior to the echo canceler. The near end delay line can be provided between the converters to delay the signal as PCM samples, thereby reducing delay line memory requirements.

摘要翻译： 提供了一种用于数字通信网络的基于调制解调器的回声消除增强。 在产生回波消除信号之前，通过在近端信号中引入非线性来减少在数字电话系统中的远端回波路径中对非线性的回波消除的影响。 近端信号在线性到PCM转换后采样。 在回波消除器之前添加PCM到线性转换。 可以在转换器之间提供近端延迟线，以将信号延迟为PCM采样，从而减少延迟线存储器的需求。