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    • 2. 发明授权
    • Receiver-driven layered error correction multicast over heterogeneous packet networks
    • 接收器驱动的分层纠错多播在异构分组网络上
    • US07697514B2
    • 2010-04-13
    • US11109250
    • 2005-04-18
    • Philip ChouAlbert WangSanjeev MehrotraAlexander Mohr
    • Philip ChouAlbert WangSanjeev MehrotraAlexander Mohr
    • H04L12/56
    • H04L1/007H04L1/0009H04L1/0017H04L1/06H04L1/1812H04L2001/0093
    • A system and method for correcting errors and losses occurring during a receiver-driven layered multicast (RLM) of real-time media over a heterogeneous packet network such as the Internet. This is accomplished by augmenting RLM with one or more layers of error correction information. This allows each receiver to separately optimize the quality of received audio and video information by subscribing to at least one error correction layer. Ideally, each source layer in a RLM would have one or more multicasted error correction data streams (i.e., layers) associated therewith. Each of the error correction layers would contain information that can be used to replace lost packets from the associated source layer. More than one error correction layer is proposed as some of the error correction packets contained in the data stream needed to replace the packets lost in the associated source stream may themselves be lost in transmission. A preferred process for generating the error correction streams involves the use of a unique adaptation of the Forward Error Correction (FEC) techniques. This process encodes the transmission data using a linear transform which adds redundant elements. The redundancy permits losses to be corrected because any of the original data elements can be derived from any of the encoded elements. Thus, as long as enough of the encoded data elements are received so as to equal the number of the original data elements, it is possible to derive all the original elements.
    • 一种用于在异构分组网络(例如因特网)下校正在实时媒体的接收机驱动分层多播(RLM)期间发生的错误和损失的系统和方法。 这是通过用一层或多层纠错信息增强RLM来实现的。 这允许每个接收机通过订阅至少一个纠错层来分别优化所接收的音频和视频信息的质量。 理想地,RLM中的每个源层将具有与其相关联的一个或多个多播的纠错数据流(即,层)。 每个纠错层将包含可用于替换相关源层丢失的分组的信息。 提出了多于一个纠错层,因为包含在替换相关源流中丢失的分组所需的数据流中的一些纠错分组本身可能在传输中丢失。 用于产生纠错流的优选过程涉及使用前向纠错(FEC)技术的唯一适配。 该过程使用添加冗余元素的线性变换对传输数据进行编码。 冗余允许修正损失,因为任何原始数据元素可以从任何编码元素导出。 因此,只要接收到足够的编码数据元素以便等于原始数据元素的数量,就有可能导出所有的原始元素。
    • 3. 发明申请
    • Receiver-driven layered error correction multicast over heterogeneous packet networks
    • 接收器驱动的分层纠错多播在异构分组网络上
    • US20050249211A1
    • 2005-11-10
    • US11177258
    • 2005-07-08
    • Philip ChouAlbert WangSanjeev MehrotraAlexander Mohr
    • Philip ChouAlbert WangSanjeev MehrotraAlexander Mohr
    • H04L1/00H04L1/06H04L1/08G06K5/04H04J3/24H04L12/28H04L12/56
    • H04L1/007H04L1/0009H04L1/0017H04L1/06H04L1/1812H04L2001/0093
    • A system and method for correcting errors and losses occurring during a receiver-driven layered multicast (RLM) of real-time media over a heterogeneous packet network such as the Internet. This is accomplished by augmenting RLM with one or more layers of error correction information. This allows each receiver to separately optimize the quality of received audio and video information by subscribing to at least one error correction layer. Ideally, each source layer in a RLM would have one or more multicasted error correction data streams (i.e., layers) associated therewith. Each of the error correction layers would contain information that can be used to replace lost packets from the associated source layer. More than one error correction layer is proposed as some of the error correction packets contained in the data stream needed to replace the packets lost in the associated source stream may themselves be lost in transmission. A preferred process for generating the error correction streams involves the use of a unique adaptation of the Forward Error Correction (FEC) techniques. This process encodes the transmission data using a linear transform which adds redundant elements. The redundancy permits losses to be corrected because any of the original data elements can be derived from any of the encoded elements. Thus, as long as enough of the encoded data elements are received so as to equal the number of the original data elements, it is possible to derive all the original elements.
    • 一种用于在异构分组网络(例如因特网)下校正在实时媒体的接收机驱动分层多播(RLM)期间发生的错误和损失的系统和方法。 这是通过用一层或多层纠错信息增强RLM来实现的。 这允许每个接收机通过订阅至少一个纠错层来分别优化所接收的音频和视频信息的质量。 理想地,RLM中的每个源层将具有与其相关联的一个或多个多播的纠错数据流(即,层)。 每个纠错层将包含可用于替换相关源层丢失的分组的信息。 提出了多于一个纠错层,因为包含在替换相关源流中丢失的分组所需的数据流中的一些纠错分组本身可能在传输中丢失。 用于产生纠错流的优选过程涉及使用前向纠错(FEC)技术的唯一适配。 该过程使用添加冗余元素的线性变换对传输数据进行编码。 冗余允许修正损失,因为任何原始数据元素可以从任何编码元素导出。 因此,只要接收到足够的编码数据元素以便等于原始数据元素的数量,就有可能导出所有的原始元素。
    • 6. 发明授权
    • System and method for restricting data access
    • 用于限制数据访问的系统和方法
    • US07644286B1
    • 2010-01-05
    • US11070907
    • 2005-03-03
    • Alexander MohrScott E. PetersenEdward R. Rowe
    • Alexander MohrScott E. PetersenEdward R. Rowe
    • G06F21/00
    • H04L63/20G06F21/6209
    • A system and method for restricting data access from an electronic document configured to access external data resources (e.g., websites, disk storage). To restrict unwanted data sharing, the document is prohibited from accessing external data resources unless it has a token corresponding to the resource. “Get” tokens and “send” tokens are granted, respectively, whenever the document is permitted to receive data from or send data to a data resource. Every attempt to receive data is automatically approved. An attempt to send data is approved automatically only if the document: (a) has no get tokens, (b) has only one get token and is attempting to send to the same resource, or (c) already has a send token corresponding to the resource and the set of get tokens has not changed since data was last sent to the resource. Otherwise, the attempt must be approved by an operator or data access policy.
    • 一种用于限制从被配置为访问外部数据资源(例如,网站,磁盘存储)的电子文档的数据访问的系统和方法。 为了限制不需要的数据共享,除非具有与资源对应的令牌,否则禁止文档访问外部数据资源。 每当允许文档从数据资源接收数据或发送数据时,分别授予“获取”令牌和“发送”令牌。 每次接收数据的尝试都会自动获得批准。 仅当文档(a)没有获得令牌,(b)只有一个获取令牌并尝试发送到相同的资源时,才会自动批准发送数据的尝试,或者(c)已经具有对应于 资源和一组get令牌从数据上次发送到资源以来没有改变。 否则,尝试必须经过运营商或数据访问策略的批准。
    • 7. 发明授权
    • Receiver-driven layered error correction multicast over heterogeneous packet networks
    • 接收器驱动的分层纠错多播在异构分组网络上
    • US07366172B2
    • 2008-04-29
    • US11177258
    • 2005-07-08
    • Philip ChouAlbert WangSanjeev MehrotraAlexander Mohr
    • Philip ChouAlbert WangSanjeev MehrotraAlexander Mohr
    • H04L12/56
    • H04L1/007H04L1/0009H04L1/0017H04L1/06H04L1/1812H04L2001/0093
    • A system and method for correcting errors and losses occurring during a receiver-driven layered multicast (RLM) of real-time media over a heterogeneous packet network such as the Internet. This is accomplished by augmenting RLM with one or more layers of error correction information. This allows each receiver to separately optimize the quality of received audio and video information by subscribing to at least one error correction layer. Ideally, each source layer in a RLM would have one or more multicasted error correction data streams (i.e., layers) associated therewith. Each of the error correction layers would contain information that can be used to replace lost packets from the associated source layer. More than one error correction layer is proposed as some of the error correction packets contained in the data stream needed to replace the packets lost in the associated source stream may themselves be lost in transmission. A preferred process for generating the error correction streams involves the use of a unique adaptation of the Forward Error Correction (FEC) techniques. This process encodes the transmission data using a linear transform which adds redundant elements. The redundancy permits losses to be corrected because any of the original data elements can be derived from any of the encoded elements. Thus, as long as enough of the encoded data elements are received so as to equal the number of the original data elements, it is possible to derive all the original elements.
    • 一种用于在异构分组网络(例如因特网)下校正在实时媒体的接收机驱动分层多播(RLM)期间发生的错误和损失的系统和方法。 这是通过用一层或多层纠错信息增强RLM来实现的。 这允许每个接收机通过订阅至少一个纠错层来分别优化所接收的音频和视频信息的质量。 理想地,RLM中的每个源层将具有与其相关联的一个或多个多播的纠错数据流(即,层)。 每个纠错层将包含可用于替换相关源层丢失的分组的信息。 提出了多于一个纠错层,因为包含在替换相关源流中丢失的分组所需的数据流中的一些纠错分组本身可能在传输中丢失。 用于产生纠错流的优选过程涉及使用前向纠错(FEC)技术的唯一适配。 该过程使用添加冗余元素的线性变换对传输数据进行编码。 冗余允许修正损失,因为任何原始数据元素可以从任何编码元素导出。 因此,只要接收到足够的编码数据元素以便等于原始数据元素的数量,就有可能导出所有的原始元素。