公开(公告)号：US20130106984A1

公开(公告)日：2013-05-02

申请号：US13287155

申请日：2011-11-02

申请人： Duanpei Wu ,  Kavitha Velusamy

发明人： Duanpei Wu ,  Kavitha Velusamy

IPC分类号： H04N7/15

CPC分类号： H04N7/15

摘要： Techniques are provided for sending and receiving key frames and key frame request messages. At a video conference bridge, a key frame request message is received from a first endpoint device. The key frame request message comprises a request for a key frame from a second endpoint device. When a prior key frame request message is received before the key frame request message, a key frame request time value is determined that corresponds to an amount of time between receiving the key frame request message and receiving the prior key frame request message. This value is compared to a threshold time value. When the key frame request time is greater than the threshold time, a key frame request forwarding message is generated, and the key frame request forwarding message is sent to the second endpoint device to request the key frame from the second endpoint device.

摘要翻译： 提供了发送和接收关键帧和关键帧请求消息的技术。 在视频会议桥上，从第一端点设备接收关键帧请求消息。 关键帧请求消息包括对来自第二端点设备的关键帧的请求。 当在关键帧请求消息之前接收到先前的关键帧请求消息时，确定对应于接收到关键帧请求消息和接收先前关键帧请求消息之间的时间量的关键帧请求时间值。 该值与阈值时间值进行比较。 当关键帧请求时间大于阈值时间时，生成关键帧请求转发消息，并将关键帧请求转发消息发送到第二终端设备，从第二终端设备请求关键帧。

公开(公告)号：US20080068449A1

公开(公告)日：2008-03-20

申请号：US11948031

申请日：2007-11-30

申请人： Duanpei Wu ,  Nermin Ismail ,  Shantanu Sarkar ,  Walter Friedrich

发明人： Duanpei Wu ,  Nermin Ismail ,  Shantanu Sarkar ,  Walter Friedrich

IPC分类号： H04N7/14

CPC分类号： H04N7/152

摘要： A method, an apparatus and a medium encoded with instructions for providing layout selection, participant selection, and/or participant-to-participant far end camera control of the selected participant for use in a continuous presence multipoint videoconference. The method includes receiving one or more far end camera control messages over a packet network from a first participant of a multipoint videoconference; maintaining an indication of a far end camera control mode for the first participant, the mode being one of a set of modes; and depending on the far end camera control mode and on controls possible, carrying out a control according to one ore more the camera control messages.

摘要翻译： 一种编码有指令的方法，装置和介质，所述指令用于提供所选参与者的布局选择，参与者选择和/或参与者至参与者远端相机控制，以用于连续存在多点视频会议。 该方法包括从多点视频会议的第一参与者通过分组网络接收一个或多个远端相机控制消息; 保持第一参与者的远端相机控制模式的指示，该模式是一组模式之一; 并且根据远端摄像机控制模式和可控的控制方式，根据摄像机控制消息一次进行控制。

公开(公告)号：US20070280194A1

公开(公告)日：2007-12-06

申请号：US11421622

申请日：2006-06-01

申请人： Duanpei Wu ,  Walter R. Friedrich ,  Shantanu Sarkar ,  Steven G. Fry

发明人： Duanpei Wu ,  Walter R. Friedrich ,  Shantanu Sarkar ,  Steven G. Fry

IPC分类号： H04L12/28

CPC分类号： H04L12/66

摘要： Marking a keyframe of a media stream in a communication system involves one or more entry media switches in communication with one or more endpoints. An entry media switch receives a media stream from an endpoint, where the media stream comprises a sequence of packets with a keyframe. The keyframe is detected and marked with a keyframe indicator. The keyframe indicator is operable to notify a downstream device of the keyframe. An output media stream is outputted.

摘要翻译： 在通信系统中标记媒体流的关键帧涉及与一个或多个端点通信的一个或多个入口媒体交换机。 入口介质交换机从端点接收媒体流，其中媒体流包括具有关键帧的分组序列。 检测到关键帧并用关键帧指示器标记​​。 关键帧指示器可操作以向下游设备通知关键帧。 输出输出媒体流。

公开(公告)号：US20050078170A1

公开(公告)日：2005-04-14

申请号：US10680918

申请日：2003-10-08

申请人： Scott Firestone ,  Walter Friedrich ,  Nermin Ismail ,  Keith Lantz ,  Shantanu Sarkar ,  Luke Surazski ,  Duanpei Wu

发明人： Scott Firestone ,  Walter Friedrich ,  Nermin Ismail ,  Keith Lantz ,  Shantanu Sarkar ,  Luke Surazski ,  Duanpei Wu

IPC分类号： H04N7/15 ,  H04N7/14

CPC分类号： H04N7/14 ,  H04L12/1822 ,  H04L65/4046 ,  H04L65/605 ,  H04M3/567 ,  H04M2207/20 ,  H04N7/15

摘要： A method for executing a video conference is provided that includes receiving one or more audio streams associated with a video conference from one or more end points and determining an active speaker associated with one of the end points. Audio information associated with the active speaker may be received at one or more media switches. One or more video streams may be suppressed except for a selected video stream associated with the active speaker, the selected video stream propagating to one or more of the media switches during the video conference. The selected video stream may be replicated such that it may be communicated to one or more of the end points associated with a selected one of the media switches.

公开(公告)号：US06778959B1

公开(公告)日：2004-08-17

申请号：US09691877

申请日：2000-10-18

申请人： Duanpei Wu ,  Lex Olorenshaw ,  Xavier Menendez-Pidal ,  Ruxin Chen

发明人： Duanpei Wu ,  Lex Olorenshaw ,  Xavier Menendez-Pidal ,  Ruxin Chen

IPC分类号： G10L1314

CPC分类号： G10L15/08

摘要： A system and method for speech verification using out-of-vocabulary models includes a speech recognizer that has a model bank with system vocabulary word models, a garbage model, and one or more noise models. The model bank may reject an utterance or other sound as an invalid vocabulary word when the model bank identifies the utterance or other sound as corresponding to the garbage model or the noise models. Initial noise models may be selectively combined into a pre-determined number of final noise model clusters to effectively reduce the number of noise models that are utilized by the model bank of the speech recognizer to verify system vocabulary words.

摘要翻译： 使用词汇外模型的语音验证的系统和方法包括语音识别器，其具有具有系统词汇词模型的模型库，垃圾模型和一个或多个噪声模型。 当模型库识别与垃圾模型或噪声模型相对应的话语或其他声音时，模型库可以拒绝话语或其他声音作为无效词汇单词。 初始噪声模型可以选择性地组合到预定数量的最终噪声模型群集中，以有效地减少由语音识别器的模型库利用以验证系统词汇单词的噪声模型的数量。

公开(公告)号：US06272460B1

公开(公告)日：2001-08-07

申请号：US09264288

申请日：1999-03-08

申请人： Duanpei Wu ,  Miyuki Tanaka ,  Lex Olorenshaw

发明人： Duanpei Wu ,  Miyuki Tanaka ,  Lex Olorenshaw

IPC分类号： G10L1900

CPC分类号： G10L25/78

摘要： A method for implementing a speech verification system for use in a noisy environment comprises the steps of generating a confidence index for an utterance using a speech verifier, and controlling the speech verifier with a processor, wherein the utterance contains frames of sound energy. The speech verifier includes a noise suppressor, a pitch detector, and a confidence determiner. The noise suppressor suppresses noise in each frame in the utterance by summing a frequency spectrum for each frame with frequency spectra of a selected number of previous frames to produce a spectral sum. The pitch detector applies a spectral comb window to each spectral sum to produce correlation values for each frame in the utterance. The pitch detector also applies an alternate spectral comb window to each spectral sum to produce alternate correlation values for each frame in the utterance. The confidence determiner evaluates the correlation values to produce a frame confidence measure for each frame in the utterance. The confidence determiner then uses the frame confidence measures to generate the confidence index for the utterance, which indicates whether the utterance is or is not speech.

摘要翻译： 用于实现在噪声环境中使用的语音验证系统的方法包括以下步骤：使用语音验证器产生用于话语的置信度指标，以及用处理器控制语音检验器，其中所述话语包含声能帧。 语音检验器包括噪声抑制器，音调检测器和置信度确定器。 噪声抑制器通过将每帧的频谱与选定数量的先前帧的频谱相加来抑制每个帧中的噪声，以产生频谱和。 音调检测器将频谱梳窗口应用于每个频谱和，以产生话音中每帧的相关值。 音调检测器还对每个频谱和应用替代频谱梳窗口，以产生话音中每帧的交替相关值。 置信度确定器评估相关值以产生话语中的每个帧的帧置信度量。 然后，置信度确定器使用帧置信度度量来产生话语的置信指数，这表明语音是否是语音。

公开(公告)号：US08760490B2

公开(公告)日：2014-06-24

申请号：US13307521

申请日：2011-11-30

申请人： Duanpei Wu ,  Jing Li ,  Shih-cheng Stan Yang ,  Herbert M. Wildfeuer ,  Anand Oswal

发明人： Duanpei Wu ,  Jing Li ,  Shih-cheng Stan Yang ,  Herbert M. Wildfeuer ,  Anand Oswal

IPC分类号： H04N7/15

CPC分类号： H04N7/15 ,  H04N21/23439 ,  H04N21/23655

摘要： A rate adaptive video conference bridge and related techniques are provided. At a video conference bridge, a source video stream is received from a source endpoint device in a network. The source video stream is encoded using a first encoder unit and second encoder unit to generate respective first and second encoded video streams. A determination is made whether to decrease or increase a bit rate of the source video stream based on network condition information. If the bit rate is to be decreased, the first encoder unit is instructed to send the first encoded video stream to a destination endpoint device. If the bit rate is to be increased, the second encoder unit is instructed to send the second encoded video stream to the destination endpoint device.

摘要翻译： 提供了速率自适应视频会议桥和相关技术。 在视频会议桥上，从网络中的源端点设备接收源视频流。 使用第一编码器单元和第二编码器单元对源视频流进行编码，以生成相应的第一和第二编码视频流。 根据网络条件信息确定是否减少或增加源视频流的比特率。 如果要降低比特率，则指示第一编码器单元将第一编码视频流发送到目的地端点设备。 如果要提高比特率，则指示第二编码器单元将第二编码视频流发送到目的地端点设备。

公开(公告)号：US08619118B2

公开(公告)日：2013-12-31

申请号：US13471288

申请日：2012-05-14

申请人： Duanpei Wu ,  Shantanu Sarkar ,  Nermin M. Ismail

发明人： Duanpei Wu ,  Shantanu Sarkar ,  Nermin M. Ismail

IPC分类号： H04N7/14

CPC分类号： H04N7/14 ,  H04N7/15

摘要： In one embodiment, an apparatus includes a first module that causes the first endpoint to receive a current speaker's video stream if the first endpoint is not the current speaker and to receive a last speaker's video stream if the first endpoint is the current speaker. The apparatus includes a second module that causes the second endpoint to receive a continuous presence, current speaker video stream if the second endpoint is not the current speaker and to receive a continuous presence, last speaker video stream if the second endpoint is the current speaker. The continuous presence, current speaker video stream comprises two or more video streams, one of which includes at least a portion of the current speaker's video stream. The continuous presence, last speaker video stream comprises two or more video streams, one of which includes at least a portion of a last speaker's video stream.

摘要翻译： 在一个实施例中，一种装置包括第一模块，如果第一端点不是当前的扬声器，则使第一端点接收当前扬声器的视频流，并且如果第一端点是当前的扬声器则接收最后的说话者的视频流。 如果第二端点是当前的说话者，该装置包括使第二端点接收连续存在的第二模块，如果第二端点不是当前的扬声器并且接收连续存在，则最后的扬声器视频流。 连续存在的当前扬声器视频流包括两个或更多个视频流，其中之一包括当前说话者的视频流的至少一部分。 连续存在的最后扬声器视频流包括两个或更多个视频流，其中之一包括最后一个扬声器的视频流的至少一部分。

公开(公告)号：US08576272B2

公开(公告)日：2013-11-05

申请号：US13102332

申请日：2011-05-06

申请人： Duanpei Wu ,  Nermin M. Ismail ,  Shantanu Sarkar ,  Walter R. Friedrich

发明人： Duanpei Wu ,  Nermin M. Ismail ,  Shantanu Sarkar ,  Walter R. Friedrich

IPC分类号： H04N7/14

CPC分类号： H04N7/152

摘要： A method, an apparatus and a medium encoded with instructions for providing layout selection, participant selection, and/or participant-to-participant far end camera control of the selected participant for use in a continuous presence multipoint videoconference. The method includes receiving one or more far end camera control messages over a packet network from a first participant of a multipoint videoconference; maintaining an indication of a far end camera control mode for the first participant, the mode being one of a set of modes; and depending on the far end camera control mode and on controls possible, carrying out a control according to one ore more the camera control messages.

摘要翻译： 一种编码有指令的方法，装置和介质，所述指令用于提供所选参与者的布局选择，参与者选择和/或参与者至参与者远端相机控制，以用于连续存在多点视频会议。 该方法包括从多点视频会议的第一参与者通过分组网络接收一个或多个远端相机控制消息; 保持第一参与者的远端相机控制模式的指示，该模式是一组模式之一; 并且根据远端摄像机控制模式和可控的控制方式，根据摄像机控制消息一次进行控制。

公开(公告)号：US20130205002A1

公开(公告)日：2013-08-08

申请号：US13365122

申请日：2012-02-02

申请人： Wenyi Wang ,  Juiping Liao ,  Rong Wang ,  Duanpei Wu ,  Shih-cheng Yang ,  Jing Hu

发明人： Wenyi Wang ,  Juiping Liao ,  Rong Wang ,  Duanpei Wu ,  Shih-cheng Yang ,  Jing Hu

IPC分类号： G06F15/173

CPC分类号： H04L41/5022 ,  H04L41/145 ,  H04L47/25 ,  H04L69/16

摘要： In one embodiment, a method includes receiving application traffic at a network device from one or more endpoints, measuring performance of applications at the network device, optimizing TCP (Transmission Control Protocol) applications and UDP (User Datagram Protocol) applications based on the measured performance and policy input received at the network device, queuing the application traffic at the network device such that the application traffic shares available bandwidth in accordance with the measured performance and the policy input, and transmitting the application traffic over a wide area network. An apparatus is also disclosed.

摘要翻译： 在一个实施例中，一种方法包括从一个或多个端点在网络设备处接收应用业务，测量网络设备上的应用的性能，基于所测量的性能优化TCP（传输控制协议）应用和UDP（用户数据报协议）应用 以及在网络设备接收到的策略输入，对网络设备上的应用流量进行排队，使得应用流量根据测量的性能和策略输入共享可用带宽，并通过广域网传输应用流量。 还公开了一种装置。