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1. 发明授权

US07072344B2 Redistribution of excess bandwidth in networks for optimized performance of voice and data sessions: methods, systems and program products 失效
标题翻译：在网络中重新分配超额带宽，以优化语音和数据会话的性能：方法，系统和程序产品
公开(公告)号：US07072344B2
公开(公告)日：2006-07-04
申请号：US09906485
申请日：2001-07-16
申请人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Dongming Hwang , Clark Debs Jeffries , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Dongming Hwang , Clark Debs Jeffries , Malcolm Scott Ware , Hua Ye
IPC分类号： H04L12/56
CPC分类号： H04L65/80 , H04L29/06027 , H04L47/70 , H04L47/745 , H04L47/748 , H04L47/765 , H04L47/801
摘要： A packet network redistributes excess bandwidth for voice and data sessions applying a Quality of Service (QoS) algorithm. The network includes interacting client stations using H.323 protocol managing bit rate according to an algorithm as voice and data sessions are added or removed from the network. The client stations include codecs coupled to the network. The codecs provide voice sessions at a minimum bandwidth using a voice codec bit rate and preferred bandwidth using another voice codec bit rate. A first algorithm applies the QoS algorithm allocating bandwidth between interacting client stations after the addition of a new voice or data session when there is insufficient bandwidth for the new session to receive preferred bandwidth. A second algorithm is applied when a voice or data session is removed from the interacting client stations. If any session is allocated minimum bandwidth the QoS increases a voice session at minimum bandwidth to preferred bandwidth if excess bandwidth is available.
摘要翻译：分组网络重新分配应用服务质量（QoS）算法的语音和数据会话的多余带宽。该网络包括使用H.323协议的交互式客户端站，根据算法管理比特率，因为语音和数据会话被从网络添加或删除。客户端站包括耦合到网络的编解码器。编解码器使用语音编解码器比特率和使用另一语音编解码器比特率的优选带宽以最小带宽提供语音会话。第一种算法在增加新的语音或数据会话之后，在新会话接收到优先带宽的带宽不足的情况下，应用QoS算法在交互的客户端站之间分配带宽。当从交互的客户端站移除语音或数据会话时，应用第二种算法。如果任何会话被分配最小带宽，则QoS会将最小带宽的语音会话增加到优先带宽，如果有超额带宽可用。

2. 发明授权

US07068601B2 Codec with network congestion detection and automatic fallback: methods, systems & program products 失效
公开(公告)号：US07068601B2
公开(公告)日：2006-06-27
申请号：US09906406
申请日：2001-07-16
申请人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Dongming Hwang , Clark Debs Jeffries , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Dongming Hwang , Clark Debs Jeffries , Malcolm Scott Ware , Hua Ye
IPC分类号： H04L12/26 , H04L12/66 , G01R31/08
CPC分类号： H04L65/607 , H04L12/6418 , H04L29/06027 , H04L47/10 , H04L47/12 , H04L47/2425 , H04L47/263 , H04L47/70 , H04L47/745 , H04L47/748 , H04L47/762 , H04L65/1009 , H04L65/80 , H04L2012/6481 , H04L2012/6497
摘要： A codec detects congestion in a packet network and responds via a session control protocol to re-negotiate codec-type and/or parameters with the receiving codec to reduce bit rate for supporting a session. Once the connection and session are established, encoded packets start flowing between the two codecs. A control entity sends and receives network congestion control packets periodically in the session. The congestion control packets provide a “heartbeat” signal to the receiving codec. When the network is not congested, all “heartbeat” packets will be passed through the network As network congestion increases, routers within the network discard excess packets to prevent network failure. The codecs respond to the missing packets by slowing down the bit rate or proceeding to renegotiate a lower bit rate via the session control protocol. If there are no missing packets, the codecs detect if the session is operating at the highest bit rate, and if not, re-negotiate a higher bit rate.

3. 发明授权

US07042841B2 Controlling network congestion using a biased packet discard policy for congestion control and encoded session packets: methods, systems, and program products 有权
公开(公告)号：US07042841B2
公开(公告)日：2006-05-09
申请号：US09906499
申请日：2001-07-16
申请人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Dongming Hwang , Clark Debs Jeffries , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Dongming Hwang , Clark Debs Jeffries , Malcolm Scott Ware , Hua Ye
IPC分类号： H04L12/26
CPC分类号： H04L47/10 , H04L47/263
摘要： A packet network congestion control system using a biased packet discard policy includes a plurality of end points having codecs operating in a framework, e.g. ITU-T H.323 protocol to establish a communication session. The protocol enables the codecs to negotiate codec type and associated parameters. Once a connection and session are established, compressed voice and data packets start flowing between the two end points. A control entity supplies congestion control packets periodically. The control packets provide a “heartbeat” signal to the codec at the other end of the session. Each codec receiver uses the “heartbeat” signal as an indication of network congestion. As network congestion increases, routers within the network discard excess packets to prevent network failure. The network discards all packets classified as congestion control packets whenever a flow control mechanism detects congestion or a trend toward congestion. As packets are discarded, the end points renegotiate codec type and/or parameters to realize lower bit rates.

4. 发明授权

US06823004B1 Methods, systems and computer program products for monitoring performance of a modem during a connection 失效
标题翻译：用于在连接期间监视调制解调器的性能的方法，系统和计算机程序产品
公开(公告)号：US06823004B1
公开(公告)日：2004-11-23
申请号：US09430097
申请日：1999-10-29
申请人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Michelle Chan Granholm , Dongming Hwang , Fredy D. Neeser , Robert John Schule , Malcolm Scott Ware , Hua Ye , Charles Robert Young
发明人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Michelle Chan Granholm , Dongming Hwang , Fredy D. Neeser , Robert John Schule , Malcolm Scott Ware , Hua Ye , Charles Robert Young
IPC分类号： H04B138
CPC分类号： G06F11/3485 , H04M11/066 , H04W24/00 , H04W48/16 , H04W76/10
摘要： Methods, systems and computer program products are provided for monitoring performance of a modem which obtain diagnostic data directly from memory associated with the modem's digital signal processor (DSP). A secondary path to the DSP memory is utilized for the monitoring operations so that real time data can be obtained during connection startup procedures and during an active connection. First-in first-out (FIFO) buffers are incorporated in the DSP memory to track state transitions of one or more of the state machines within the modem and various performance data measurements may be obtained directly from the DSP memory responsive to different state transition events. The real time collected data may be stored in a file and provided to a remote location for use in diagnosing customer problems with specific customer line connections. Accordingly, real time monitoring of digital and analog line conditions and modem performance may be utilized to diagnose problems with modems and line connections.
摘要翻译：提供了方法，系统和计算机程序产品，用于监视直接从与调制解调器的数字信号处理器（DSP）相关联的存储器获取诊断数据的调制解调器的性能。利用DSP存储器的辅助路径进行监视操作，以便在连接启动过程期间和在主动连接期间可以获得实时数据。先进先出（FIFO）缓冲器被并入DSP存储器中以跟踪调制解调器内的一个或多个状态机的状态转换，并且可以响应于不同的状态转换事件从DSP存储器直接获得各种性能数据测量。实时收集的数据可以存储在文件中并提供给远程位置以用于诊断具有特定客户线路连接的客户问题。因此，可以利用数字和模拟线路条件和调制解调器性能的实时监测来诊断调制解调器和线路连接的问题。

5. 发明授权

US06661837B1 MODEMS, METHODS, AND COMPUTER PROGRAM PRODUCTS FOR SELECTING AN OPTIMUM DATA RATE USING ERROR SIGNALS REPRESENTING THE DIFFERENCE BETWEEN THE OUTPUT OF AN EQUALIZER AND THE OUTPUT OF A SLICER OR DETECTOR 失效
公开(公告)号：US06661837B1
公开(公告)日：2003-12-09
申请号：US09264475
申请日：1999-03-08
申请人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Evangelos Stavros Eleftheriou , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Evangelos Stavros Eleftheriou , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
IPC分类号： H04B1700
CPC分类号： H04L1/0021 , H04L1/0002 , H04L25/03057 , H04L25/4927 , H04L2025/03388 , Y02D50/10
摘要： Modems, methods, and computer program products select a data rate based on error signals in a modem. In an illustrative embodiment, error signals representing the difference between an output of an equalizer and an output of a detector are accumulated and an average error value is computed therefrom. A signal to noise ratio is determined using the average error value. The signal to noise ratio is then used to select a data rate. In another illustrative embodiment, the mean squared error at the output of the equalizer is determined and then used, along with the probability of error in correctly detecting a symbol, to select a data rate. Incorrect decisions in detecting received data symbols can cause a catastrophic failure in a decision feedback equalizer used in a modem receiver as errors are repeatedly fed back causing the tap coefficients for the equalizer filters to be shifted from their normal operating values. By adjusting the data rate in accordance with the error signals generated in a modem receiver, the decision feedback equalizer can operate with greater stability as the data rate can be reduced in response to increased noise conditions.

6. 发明授权

US06967995B1 Methods, systems and computer program products for carrier drop detection using a variable threshold 有权
标题翻译：方法，系统和计算机程序产品，用于使用可变阈值进行载波丢失检测
公开(公告)号：US06967995B1
公开(公告)日：2005-11-22
申请号：US09430501
申请日：1999-10-29
申请人： Dongming Hwang , Robert John Schule , Malcolm Scott Ware , Hua Ye
发明人： Dongming Hwang , Robert John Schule , Malcolm Scott Ware , Hua Ye
IPC分类号： H04L5/16 , H04M11/06
CPC分类号： H04M11/066 , H04L43/16
摘要： Methods, systems and computer program products are provided which utilize a variable threshold for carrier drop detection. The carrier drop detection threshold is updated based on a recognized data sequence contained within the signal received by the modem. The received signal is demodulated to obtain the signal data and an updated threshold is latched when a desired data sequence is recognized in the demodulated data. Accordingly, the threshold may be updated and set as an offset from or a percentage of the carrier signal level at the time of receipt of the desired data sequence. For example, in a V.90 modem using a V.8 phase 1 sequence, receipt of the CM signal (for the answer modem) or the JM signal (for the call modem) may be used to latch an updated level for the carrier drop detection threshold, which may then be used for detecting carrier drop during the silence transmission at the end of phase 1 to allow reliable preparation of the modem for receipt of the INFO0 signal at the start of phase 2.
摘要翻译：提供了方法，系统和计算机程序产品，其利用用于载波掉落检测的可变阈值。基于由调制解调器接收的信号中包含的识别数据序列来更新载波丢失检测阈值。解调接收到的信号以获得信号数据，并且当在解调数据中识别期望的数据序列时，锁存更新的阈值。因此，可以更新阈值并将其设置为在接收期望数据序列时与载波信号电平的偏移量或百分比。例如，在使用V.8阶段1序列的V.90调制解调器中，可以使用CM信号（用于应答调制解调器）或JM信号（对于呼叫调制解调器）的接收来锁存用于载波的更新级别丢失检测阈值，其可以用于在相位1结束时的静音传输期间检测载波丢失，以允许在阶段2开始时可靠地准备用于接收INFO0信号的调制解调器。

7. 发明授权

US06757325B1 Methods, modems and computer program products for identification of a modem type and adjustment of a communication configuration based on modem type 有权
标题翻译：用于识别调制解调器类型的调制解调器和计算机程序产品以及基于调制解调器类型的通信配置的调整
公开(公告)号：US06757325B1
公开(公告)日：2004-06-29
申请号：US09430698
申请日：1999-10-29
申请人： Youssef Abdelilah , Gordon Taylor Davis , Ajay Dholakia , Dongming Hwang , Fredy D. Neeser , Robert John Schule , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Ajay Dholakia , Dongming Hwang , Fredy D. Neeser , Robert John Schule , Malcolm Scott Ware , Hua Ye
IPC分类号： H04L516
CPC分类号： H04L25/4927
摘要： Methods, modems and computer program products for detecting whether a remote modem is of a particular design type and for adjusting the communication configuration for a communication session based on a type of the remote modem. The modem type is recognized based on a knowledge that the modem design of certain manufacturers has a unique associated data pattern contained within the startup communication sequence which is not specified by the protocol but which can be demodulated and detected to thereby recognize that the remote modem is a particular manufacturer's design type. Based on knowledge of the characteristics of the remote modem design, various steps are taken which may improve performance of the communication connection in light of the particular modem design's characteristics. For example, a different Total Harmonic Distortion (THD) threshold may be used for falling back to V.34 communications when the remote modem design only supports up to 2 look ahead for spectrum shaping.
摘要翻译：用于检测远程调制解调器是否是特定设计类型的方法，调制解调器和计算机程序产品，以及用于基于远程调制解调器的类型来调整通信会话的通信配置。基于知道某些制造商的调制解调器设计具有包含在启动通信序列内的唯一关联数据模式的知识，可以识别调制解调器类型，该数据模式不是由协议规定的，而是可以被解调和检测，从而识别远程调制解调器特定制造商的设计类型。基于对远程调制解调器设计的特征的了解，采取了各种步骤，可以根据特定的调制解调器设计的特性改善通信连接的性能。例如，当远程调制解调器设计仅支持最多2个前进用于频谱整形时，可以使用不同的总谐波失真（THD）阈值来回退到V.34通信。

8. 发明授权

US06665336B2 MODEMS, METHODS, AND COMPUTER PROGRAM PRODUCTS FOR SELECTING AN OPTIMUM DATA RATE USING ERROR SIGNALS REPRESENTING THE DIFFERENCE BETWEEN THE OUTPUT OF AN EQUALIZER AND THE OUTPUT OF A SLICER OR DETECTOR 失效
标题翻译：使用错误信号选择最佳数据速率的方式，方法和计算机程序产品，表示均衡器的输出与切换器或检测器的输出之间的差异
公开(公告)号：US06665336B2
公开(公告)日：2003-12-16
申请号：US10428357
申请日：2003-05-02
申请人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Evangelos Stavros Eleftheriou , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Evangelos Stavros Eleftheriou , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
IPC分类号： H04B1700
CPC分类号： H04L1/0021 , H04L1/0002 , H04L25/03057 , H04L25/4927 , H04L2025/03388 , Y02D50/10
摘要： Modems, methods, and computer program products select a data rate based on error signals in a modem. In an illustrative embodiment, error signals representing the difference between an output of an equalizer and an output of a detector are accumulated and an average error value is computed therefrom. A signal to noise ratio is determined using the average error value. The signal to noise ratio is then used to select a data rate. In another illustrative embodiment, the mean squared error at the output of the equalizer is determined and then used, along with the probability of error in correctly detecting a symbol, to select a data rate. Incorrect decisions in detecting received data symbols can cause a catastrophic failure in a decision feedback equalizer used in a modem receiver as errors are repeatedly fed back causing the tap coefficients for the equalizer filters to be shifted from their normal operating values. By adjusting the data rate in accordance with the error signals generated in a modem receiver, the decision feedback equalizer can operate with greater stability as the data rate can be reduced in response to increased noise conditions.
摘要翻译：调制解调器，方法和计算机程序产品根据调制解调器中的错误信号选择数据速率。在说明性实施例中，代表均衡器的输出和检测器的输出之间的差的误差信号被累加，并且从其计算出平均误差值。使用平均误差值确定信噪比。然后使用信噪比来选择数据速率。在另一说明性实施例中，确定均衡器的输出处的均方误差，然后与正确检测符号的误差概率一起使用以选择数据速率。检测接收到的数据符号时的不正确决定可能导致在调制解调器接收机中使用的判决反馈均衡器中的灾难性故障，因为错误被反复反馈，导致均衡器滤波器的抽头系数从其正常操作值偏移。通过根据在调制解调器接收机中产生的误差信号来调整数据速率，当响应于增加的噪声条件可以减小数据速率时，判决反馈均衡器可以更稳定地工作。

9. 发明授权

US06650657B1 Systems, methods and computer program products for identifying digital impairments in modem signals 失效
标题翻译：用于识别调制解调器信号数字损伤的系统，方法和计算机程序产品
公开(公告)号：US06650657B1
公开(公告)日：2003-11-18
申请号：US09429859
申请日：1999-10-29
申请人： Youssef Abdelilah , Gordon Taylor Davis , Ajay Dholakia , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Ajay Dholakia , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
IPC分类号： H04J324
CPC分类号： H04J3/125
摘要： Robbed Bit Signaling (RBS) and PAD digital impairments in sets of Digital Impairment Learning (DIL) signals that are repeatedly transmitted from a server modem to a client modem during DIL intervals are identified by identifying a PAD level for the sets of DIL signals in the DIL intervals and then identifying an RBS type for individual sets of DIL signals based upon the PAD levels so identified. The PAD level may be identified using model DIL signals that correspond to PAD levels that are not subject to RBS. The RBS type may be identified using model DIL signals that correspond to multiple RBS types that are subject to the identified PAD level. More specifically, one of the DIL intervals that contains DIL signals that are not subject to RBS is identified. A PAD level for the DIL signals in the one of the DIL intervals so identified then is determined. The PAD level that was determined is applied to the DIL signals in remaining ones of the DIL intervals, to identify an RBS for the DIL signals in the remaining ones of the DIL intervals.
摘要翻译：通过在DIL间隔期间从服务器调制解调器重复发送到客户端调制解调器的数字损伤学习（DIL）信号中的Robbed位信令（RBS）和PAD数字损伤被识别为DIL信号组中的PAD电平 DIL间隔，然后基于所识别的PAD水平识别用于各组DIL信号的RBS类型。可以使用对应于不受RBS的PAD电平的模型DIL信号来识别PAD电平。可以使用对应于经受所识别的PAD电平的多个RBS类型的模型DIL信号来识别RBS类型。更具体地，识别包含不受RBS的DIL信号的DIL间隔之一。确定如此识别的DIL间隔之一中的DIL信号的PAD电平。将确定的PAD电平应用于DIL间隔中剩余的DIL信号，以识别DIL间隔中剩余的DIL信号中的DBS信号的RBS。

10. 发明授权

US06341360B1 Decision feedback equalizers, methods, and computer program products for detecting severe error events and preserving equalizer filter characteristics in response thereto 失效
标题翻译：用于检测严重错误事件的决策反馈均衡器，方法和计算机程序产品，并且响应于此而保持均衡器滤波器特性
公开(公告)号：US06341360B1
公开(公告)日：2002-01-22
申请号：US09264094
申请日：1999-03-08
申请人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Evangelos Stavros Eleftheriou , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
发明人： Youssef Abdelilah , Gordon Taylor Davis , Jeffrey Haskell Derby , Ajay Dholakia , Evangelos Stavros Eleftheriou , Dongming Hwang , Fredy D. Neeser , Malcolm Scott Ware , Hua Ye
IPC分类号： G06F1100
CPC分类号： H04L25/4927 , H04L25/03057 , H04L2025/03363 , H04L2025/03694
摘要： Decision feedback equalizers having a stabilization capability, and methods and computer program products for stabilizing a decision feedback equalizer under severe error conditions use output samples from an equalizer to determine whether a severe error event has occurred in accordance with predefined criteria. If a severe error occurs, then a determination is made to evaluate whether the number of severe errors that have occurred has exceeded a threshold. If the threshold has been exceeded, then the coefficients for the filter(s) in the decision feedback equalizer are preserved in their current state. Severe errors can cause the equalizer filter coefficients to be pulled away from their normal operating values, which can result in several modulation cycles passing before the coefficients are restored. By preserving the equalizer filter coefficients under severe error conditions, the present invention prevents sharp or dramatic changes to the coefficient values from their steady state values allowing the decision feedback equalizer to recover more quickly from the errors.
摘要翻译：具有稳定能力的判决反馈均衡器，以及用于在严重误差条件下稳定判决反馈均衡器的方法和计算机程序产品，使用来自均衡器的输出样本来确定是否根据预定标准发生严重错误事件。如果发生严重的错误，则进行判断，以评估发生的严重错误的数量是否超过阈值。如果超过阈值，则判决反馈均衡器中滤波器的系数保持在其当前状态。严重的错误可能导致均衡器滤波器系数从其正常工作值被拉开，这可能导致在系数恢复之前通过的多个调制周期。通过在严重的误差条件下保持均衡器滤波器系数，本发明防止系数值从其稳定状态值的急剧或显着变化，从而允许判决反馈均衡器从错误中更快地恢复。

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