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    • 4. 发明授权
    • Apparatus and method for correcting jitter in data packets
    • 用于校正数据包抖动的装置和方法
    • US5966387A
    • 1999-10-12
    • US651297
    • 1996-05-22
    • Leo Cloutier
    • Leo Cloutier
    • H04L12/56H04N7/24H04N7/58H04N7/62H04Q11/04H04J3/06
    • H04Q11/0478H04N21/4305H04N21/4344H04N21/44004H04N21/64307H04L2012/5638H04L2012/5649
    • An arrangement (apparatus and method) for detecting jitter caused during transport of digitally-coded information, such as MPEG-encoded data packets, and for correcting time stamp reference values in accordance with the detected jitter. The disclosed arrangement detects program clock reference (PCR) values from an MPEG-encoded transport stream, where each PCR value represents an expected arrival time of a corresponding stream segment. An actual arrival time for the corresponding stream segment is determined in response to detection of the corresponding PCR value and an independent clock signal. The expected arrival time of the stream segment and the actual arrival time are correlated with an accumulation of expected and actual arrival times of previously-received data packet stream segments in order to determine the jitter and the desired expected arrival time of the corresponding stream segment. The jitter is corrected by a combination of adaptive buffering techniques and restamping the PCR value with corrected values coinciding with the actual arrival time of the stream segments. The disclosed arrangement may be implemented in a receiver system, or as part of the network node that minimizes the effects of cell delay variation in an ATM network.
    • 一种用于检测在诸如MPEG编码的数据分组之类的数字编码信息的传送期间引起的抖动的装置(装置和方法),并且用于根据检测到的抖动来校正时间戳参考值。 所公开的布置从MPEG编码的传输流检测程序时钟参考(PCR)值,其中每个PCR值表示相应流段的预期到达时间。 响应于检测到对应的PCR值和独立的时钟信号来确定对应流段的实际到达时间。 流段的预期到达时间和实际到达时间与先前接收的数据分组流段的预期和实际到达时间的累积相关,以便确定相应流段的抖动和期望的预期到达时间。 通过自适应缓冲技术的组合来校正抖动,并且使用与流段的实际到达时间一致的校正值来重建PCR值。 所公开的布置可以在接收机系统中实现,或者作为使ATM网络中的小区延迟变化的影响最小化的网络节点的一部分来实现。
    • 8. 发明授权
    • Network monitoring system for cell delay variation
    • 网络监控系统,用于信元延迟变化
    • US5805602A
    • 1998-09-08
    • US725653
    • 1996-10-01
    • Leo CloutierDavid C. CurtisKathleen P. CurtisDavid D. DeNunzioWilliam P. ReedRobert A. Wolak
    • Leo CloutierDavid C. CurtisKathleen P. CurtisDavid D. DeNunzioWilliam P. ReedRobert A. Wolak
    • H04L12/56H04N21/43H04N21/434H04N21/44H04N21/643H04Q11/04H04J3/06
    • H04N21/44004H04N21/4305H04N21/4344H04N21/64307H04Q11/0478H04L2012/5638H04L2012/5649
    • An arrangement (apparatus and method) for monitoring jitter caused during transport of digitally-coded information in a packet switched network, and for managing network operations in accordance with the detected jitter. The detected jitter is used to determine whether corrective action is necessary, such as rerouting network traffic, or performing network maintenance. The disclosed arrangement detects program clock reference (PCR) values from an MPEG-encoded transport stream, whereby each pair of PCR values represents an expected arrival time of a corresponding stream segment. An actual arrival time for the corresponding stream segment is determined in response to detection of the corresponding PCR values and an independent clock signal. The expected arrival time of the stream segment and the actual arrival time are correlated with an accumulation of expected and actual arrivaimes of previously-received data packet stream segments in order to determine the jitter in the digital data stream. The jitter is corrected by a combination of adaptive buffering techniques and restamping the PCR value with corrected values coinciding with the actual arrival time of the stream segments.
    • 一种用于监视在分组交换网络中传输数字编码信息期间引起的抖动并根据检测到的抖动来管理网络操作的装置(装置和方法)。 检测到的抖动用于确定是否需要纠正措施,如重新路由网络流量或执行网络维护。 所公开的布置从MPEG编码的传输流检测程序时钟参考(PCR)值,由此每对PCR值表示相应流段的预期到达时间。 响应于检测到相应的PCR值和独立的时钟信号来确定相应流段的实际到达时间。 流段的预期到达时间和实际到达时间与先前接收的数据分组流段的预期和实际到达的累积相关联,以便确定数字数据流中的抖动。 通过自适应缓冲技术的组合来校正抖动,并且使用与流段的实际到达时间一致的校正值来重建PCR值。
    • 10. 发明授权
    • Apparatus and method for correcting jitter in data packets
    • 用于校正数据包抖动的装置和方法
    • US5790543A
    • 1998-08-04
    • US533501
    • 1995-09-25
    • Leo Cloutier
    • Leo Cloutier
    • H04L12/56H04N21/43H04N21/434H04N21/44H04N21/643H04Q11/04H04N7/52
    • H04N21/44004H04N21/4305H04N21/4344H04N21/64307H04Q11/0478H04L2012/5638H04L2012/5649
    • An arrangement (apparatus and method) for detecting jitter caused during transport of digitally-coded information, such as MPEG-encoded data packets, and for correcting time stamp reference values in accordance with the detected jitter. The disclosed arrangement detects program clock reference (PCR) values from an MPEG-encoded transport stream, whereby each pair of PCR values represents an expected interarrival time of a corresponding stream segment. An actual interarrival time for the corresponding stream segment is determined in response to detection of the corresponding PCR values and an independent clock signal. The expected interarrival time of the stream segment is compared with the actual interarrival time in order to determine the jitter in the data packet stream. The jitter is corrected by a combination of adaptive buffering techniques and restamping the PCR value with corrected values coinciding with the actual interarrival time of the stream segments. The disclosed arrangement may be implemented in a receiver system, or as part of the network node that minimizes the effects of cell delay variation in an ATM network.
    • 一种用于检测在诸如MPEG编码的数据分组之类的数字编码信息的传送期间引起的抖动的装置(装置和方法),并且用于根据检测到的抖动来校正时间戳参考值。 所公开的布置从MPEG编码的传输流检测程序时钟参考(PCR)值,由此每对PCR值表示相应流段的期望的间隔时间。 响应于检测到相应的PCR值和独立的时钟信号来确定相应流段的实际间隔时间。 为了确定数据分组流中的抖动,将流分段的预期时间间隔与实际的时间间隔进行比较。 通过自适应缓冲技术的组合来校正抖动,并且使用与流片段的实际间隔时间一致的校正值来重建PCR值。 所公开的布置可以在接收机系统中实现,或者作为使ATM网络中的小区延迟变化的影响最小化的网络节点的一部分来实现。