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    • 7. 发明授权
    • Data communication apparatus and method
    • 数据通信装置及方法
    • US08254372B2
    • 2012-08-28
    • US10782754
    • 2004-02-23
    • Rafi RabipourChung Cheung Chu
    • Rafi RabipourChung Cheung Chu
    • H04L12/66H04L27/00G06F15/16G06F15/177G06F17/28G10L19/12
    • H04W88/181H04L29/06H04L29/06027H04L65/103H04L65/104H04L65/1069H04L65/605H04L69/14H04L69/24H04L69/40
    • Communication apparatus having interfaces for exchanging data with first and second neighbors, a memory for storing codec information regarding the communication apparatus and a control entity operative to detect a message from the first neighbor, the first message being indicative of codec information regarding an originating entity. In response, the control entity assesses compatibility between the codec information regarding the originating entity and the codec information regarding the communication apparatus. If the assessment is positive, the control entity self-identifies the communication apparatus as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity. If the assessment is negative, the control entity self-identifies the communication apparatus as a candidate for non-terminally supporting such negotiation. The invention thus capitalizes on the realization that although an end-to-end codec-bypass connection may not be possible, it may nevertheless be possible to achieve bandwidth savings by establishing a codec-bypass connection along only a portion of the path.
    • 具有用于与第一和第二邻居交换数据的接口的通信设备,用于存储关于通信设备的编解码器信息的存储器和可操作以检测来自第一邻居的消息的控制实体,第一消息指示关于发起实体的编解码器信息。 作为响应,控制实体评估关于发起实体的编解码器信息与关于通信设备的编解码器信息之间的兼容性。 如果评估是肯定的,则控制实体将通信设备自身识别为用于终止支持与始发实体的后续编解码器 - 旁路协商的候选者。 如果评估是否定的,则控制实体将通信设备自身识别为非终端支持该协商的候选者。 因此,本发明实现了尽管端到端编解码器旁路连接可能是不可能的,但是仍然可以通过仅沿路径的一部分建立编解码器旁路连接来实现带宽节省。
    • 8. 发明授权
    • Method and apparatus for time alignment along a multi-node communication link
    • 用于沿着多节点通信链路进行时间对准的方法和装置
    • US07817678B2
    • 2010-10-19
    • US11839861
    • 2007-08-16
    • Chung Cheung ChuRafi Rabipour
    • Chung Cheung ChuRafi Rabipour
    • H04J3/06
    • H04L12/66H04N21/2335H04N21/23805H04N21/6181H04N21/64307H04N21/64322
    • A network entity, which comprises an input configured to receive from an upstream network entity a stream of first media data elements; an output configured to release towards a downstream network entity a stream of second media data elements; a processing engine configured to effect processing tasks on the first media data elements, thereby to generate the second media data elements, the processing tasks being effected in a set of processing intervals; and a control entity. The control entity is configured for receiving a request for a first phase adjustment from the downstream network entity; modifying the set of processing intervals in which are effected the processing tasks in an attempt to accommodate the first phase adjustment; determining a second phase adjustment based on arrival characteristics of the first media data elements and the modified set of processing intervals; and releasing towards the upstream network entity a request for the second phase adjustment.
    • 网络实体,其包括被配置为从上游网络实体接收第一媒体数据元素流的输入; 被配置为向下游网络实体释放第二媒体数据元素流的输出; 处理引擎被配置为对所述第一媒体数据元素执行处理任务,从而生成所述第二媒体数据元素,所述处理任务在一组处理间隔中进行; 和控制实体。 控制实体被配置为从下游网络实体接收对第一阶段调整的请求; 修改处理间隔的集合,以试图适应第一阶段调整; 基于所述第一媒体数据元素的到达特性和所述经修改的处理间隔集确定第二相位调整; 向上游网络实体发布第二阶段调整请求。
    • 9. 发明授权
    • Methods and apparatus for distinguishing stationary signals from
non-stationary signals
    • 用于区分平稳信号和非平稳信号的方法和装置
    • US5774847A
    • 1998-06-30
    • US933531
    • 1997-09-18
    • Chung Cheung ChuRafi Rabipour
    • Chung Cheung ChuRafi Rabipour
    • G10L11/02G10L19/04G10L9/14
    • G10L25/78G10L19/04
    • In methods and apparatus for distinguishing stationary signals from non-stationary signals, a set of Linear Predictive Coding (LPC) coefficients characterizing spectral properties of the signal for each of a plurality of successive time intervals, including a current time interval, is determined. The LPC coefficients are averaged over a plurality of successive time intervals preceding the current time interval, and a cross-correlation of the LPC coefficients for the current time interval with the averaged LPC coefficients is determined. The signal is declared to be stationary in the current time interval when the cross-correlation exceeds a threshold value, and is declared to be non-stationary in the current time interval when the cross-correlation is less than the threshold value. The methods and apparatus are particularly applicable to detection of transitions between an absence of speech state, characterized by a stationary signal, and a presence-of-speech state characterized by a non-stationary signal.
    • 在用于区分平稳信号和非平稳信号的方法和装置中,确定了表征包括当前时间间隔的多个连续时间间隔中的每一个的信号的频谱特性的一组线性预测编码(LPC)系数。 LPC系数在当前时间间隔之前的多个连续时间间隔中被平均,并且确定当前时间间隔的LPC系数与平均的LPC系数的互相关。 信号在互相关超过阈值的当前时间间隔中被声明为静止,并且当互相关小于阈值时,在当前时间间隔中被声明为不稳定。 所述方法和装置特别适用于检测由不稳定信号表征的语音状态的不存在以及以非平稳信号为特征的语音状态之间的转换。