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    • 1. 发明申请
    • Method and apparatus for defending against denial of service attacks in IP networks by target victim self-identification and control
    • 通过目标受害者自我识别和控制来防御IP网络中的拒绝服务攻击的方法和装置
    • US20070033650A1
    • 2007-02-08
    • US11197842
    • 2005-08-05
    • Eric GrosseThomas Woo
    • Eric GrosseThomas Woo
    • G06F12/14G06F11/00G06F12/16G06F15/18G08B23/00
    • H04L63/1458H04L63/0236H04L63/0263H04L63/1408H04L2463/141
    • A method and apparatus for defending against a Denial of Service attack wherein a target victim of an attack recognizes the existence of an attack, identifies the source of the attack, and automatically instructs its carrier network to limit (e.g., block) transmission of packets from the identified source to the victim. The victim may identify the existence of an attack based on various criteria determined within the victim's site's infrastructure, and may employ event correlation techniques to make the determination. The victim then communicates one or more source/destination IP (Internet Protocol) address pairs to the carrier, which will then limit the transmission of packets from a specified destination IP address to a corresponding source IP address. The victim may advantageously communicate the source/destination IP address pairs with use of security signatures and by using redundant connections to the carrier network to ensure delivery even under congested network conditions.
    • 一种用于防御拒绝服务攻击的方法和装置,其中攻击的目标受害者识别攻击的存在,识别攻击源,并自动指示其载波网络限制(例如,阻塞)来自 确定的来源给受害者。 受害者可以根据受害者场所基础设施内确定的各种标准来识别攻击的存在,并可采用事件相关技术进行确定。 然后,受害者将一个或多个源/目的地IP(因特网协议)地址对传送到运营商,然后这将限制从指定的目的地IP地址到相应的源IP地址的分组的传输。 受害者可以有利地使用安全签名传送源/目的地IP地址对,并且通过使用到运营商网络的冗余连接来确保即使在拥塞的网络条件下的传送。
    • 6. 发明申请
    • Data-driven method and apparatus for real-time mixing of multichannel signals in a media server
    • 用于在媒体服务器中实时混合多信道信号的数据驱动方法和装置
    • US20050286664A1
    • 2005-12-29
    • US10875553
    • 2004-06-24
    • Jingdong ChenYiteng HuangThomas Woo
    • Jingdong ChenYiteng HuangThomas Woo
    • H03D1/04H04L1/00H04L29/06H04M3/56H04M7/00
    • H04M7/006H04L29/06027H04L65/4038H04L65/605H04M3/56H04M3/568
    • An apparatus for mixing audio signals in a voice-over-IP teleconferencing environment comprises a preprocessor, a mixing controller, and a mixing processor. The preprocessor is divided into a media parameter estimator and a media preprocessor. The media parameter estimator estimates signal parameters such as signal-to-noise ratios, energy levels, and voice activity (i.e., the presence or absence of voice in the signal), which are used to control how different channels are mixed. The media preprocessor employs signal processing algorithms such as silence suppression, automatic gain control, and noise reduction, so that the quality of the incoming voice streams is optimized. Based on a function of the estimated signal parameters, the mixing controller specifies a particular mixing strategy and the mixing processor mixes the preprocessed voice streams according the strategy provided by the controller.
    • 一种用于在IP语音电话会议环境中混合音频信号的装置包括预处理器,混合控制器和混合处理器。 预处理器被分为媒体参数估计器和媒体预处理器。 媒体参数估计器估计用于控制如何混合不同信道的信号参数,例如信噪比,能级和语音活动(即信号中的语音的存在或不存在)。 媒体预处理器采用静音抑制,自动增益控制,降噪等信号处理算法,优化了传入语音流的质量。 基于估计的信号参数的函数,混合控制器指定特定的混合策略,并且混合处理器根据控制器提供的策略来混合预处理的语音流。