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    Video Decoder with an Adjustable Video Clock
    3.
    发明申请
    Video Decoder with an Adjustable Video Clock 审中-公开
    具有可调视频时钟的视频解码器

    公开(公告)号：US20090109988A1

    公开(公告)日：2009-04-30

    申请号：US11925013

    申请日：2007-10-26

    申请人： Chowdhary Musunuri ,  David J. Mackie ,  Richard T. Wales ,  J. William Mauchly

    发明人： Chowdhary Musunuri ,  David J. Mackie ,  Richard T. Wales ,  J. William Mauchly

    IPC分类号： H04L12/56

    CPC分类号： H04L12/1827 ,  G06F3/14 ,  G06F3/1454 ,  G09G5/12 ,  G09G2340/02 ,  H04N19/132 ,  H04N19/436 ,  H04N19/44 ,  H04N19/587 ,  H04N19/61 ,  H04N21/23406 ,  H04N21/4305 ,  H04N21/4307 ,  H04N21/44004

    摘要： A method, an apparatus, and logic encoded in a computer-readable medium to carry out a method. The method includes receiving packets containing compressed video information, storing the received packets in a buffer memory, timestamping the received packets according to an adjustable clock; and removing packets from the buffer for decoding and playout of the video information, the removing according to playback order and at a time determined by the adjustable clock. The method includes adjusting the adjustable clock from time to time according to a measure the amount of time that the packets reside in the buffer memory, such that time latency caused by the buffer memory is limited. An overrun or an underrun of the buffer memory is unlikely.

    摘要翻译： 一种在计算机可读介质中编码以执行方法的方法，装置和逻辑。 该方法包括接收包含压缩视频信息的分组，将接收到的分组存储在缓冲存储器中，根据可调节时钟对接收的分组进行时间戳; 以及从缓冲器中去除数据包以解码和播放视频信息，按照播放顺序和由可调节时钟确定的时间进行移除。 该方法包括根据测量数据包驻留在缓冲存储器中的时间量来不时地调整可调节时钟，使得由缓冲存储器引起的时间延迟受到限制。 缓冲存储器的溢出或欠载不太可能。

    Automatic Display Latency Measurement System for Video Conferencing
    4.
    发明申请
    Automatic Display Latency Measurement System for Video Conferencing 有权
    视频会议自动显示延迟测量系统

    公开(公告)号：US20110018959A1

    公开(公告)日：2011-01-27

    申请号：US12509870

    申请日：2009-07-27

    申请人： Joseph T. Friel ,  Philip R. Graham ,  Richard T. Wales ,  Tor A. Sundsbarm ,  Paul J. Randall

    发明人： Joseph T. Friel ,  Philip R. Graham ,  Richard T. Wales ,  Tor A. Sundsbarm ,  Paul J. Randall

    IPC分类号： H04N7/15

    CPC分类号： H04N7/142 ,  H04N21/2368 ,  H04N21/4223 ,  H04N21/4307 ,  H04N21/4341 ,  H04N21/44008

    摘要： Methods and systems that compensate for display latency when separate speakers are used during video conferencing. A method includes determining whether speakers, which are not controlled by a display, are to be used in connection with a video conferencing session. The method further includes sending, to the display, data that causes the display to generate a predetermined pattern, capturing imagery of the effects of the predetermined pattern shown on the display, calculating a latency of the display based on a difference in a time the data was sent and the imagery of the effects is received, and storing a value of the latency of the display in a device that enables the video conferencing. When the speakers, which are not controlled by the display are selected, are selected, the audio portion of the video conferencing session is redirected to those speakers, but delayed for an amount of time substantially equivalent to the value of the latency of the display. In this way audio and video synchronization may be improved.

    摘要翻译： 在视频会议中使用独立扬声器时，可补偿显示延迟的方法和系统。 一种方法包括确定是否将与视频会议会话结合使用不是由显示器控制的扬声器。 该方法还包括向显示器发送导致显示器产生预定图案的数据，捕获显示器上显示的预定图案的效果的图像，基于数据的时间差来计算显示器的等待时间 被发送并且接收到影响的图像，并且将显示器的等待时间的值存储在能够进行视频会议的设备中。 当选择不由显示器控制的扬声器时，视频会议会话的音频部分被重定向到那些扬声器，但延迟了与显示器的等待时间值基本上相当的时间量。 这样可以改善音频和视频同步。

    Automatic display latency measurement system for video conferencing
    5.
    发明授权
    Automatic display latency measurement system for video conferencing 有权
    用于视频会议的自动显示延迟测量系统

    公开(公告)号：US08599235B2

    公开(公告)日：2013-12-03

    申请号：US12509870

    申请日：2009-07-27

    申请人： Joseph T. Friel ,  Philip R. Graham ,  Richard T. Wales ,  Tor A. Sundsbarm ,  Paul J. Randall

    发明人： Joseph T. Friel ,  Philip R. Graham ,  Richard T. Wales ,  Tor A. Sundsbarm ,  Paul J. Randall

    IPC分类号： H04N7/14

    CPC分类号： H04N7/142 ,  H04N21/2368 ,  H04N21/4223 ,  H04N21/4307 ,  H04N21/4341 ,  H04N21/44008

    摘要： Methods and systems that compensate for display latency when separate speakers are used during video conferencing. A method includes determining whether speakers, which are not controlled by a display, are to be used in connection with a video conferencing session. The method further includes sending, to the display, data that causes the display to generate a predetermined pattern, capturing imagery of the effects of the predetermined pattern shown on the display, calculating a latency of the display based on a difference in a time the data was sent and the imagery of the effects is received, and storing a value of the latency of the display in a device that enables the video conferencing. When the speakers, which are not controlled by the display are selected, are selected, the audio portion of the video conferencing session is redirected to those speakers, but delayed for an amount of time substantially equivalent to the value of the latency of the display. In this way audio and video synchronization may be improved.

    摘要翻译： 在视频会议中使用独立扬声器时，可补偿显示延迟的方法和系统。 一种方法包括确定是否将与视频会议会话结合使用不是由显示器控制的扬声器。 该方法还包括向显示器发送导致显示器产生预定图案的数据，捕获显示器上显示的预定图案的效果的图像，基于数据的时间差来计算显示器的等待时间 被发送并且接收到影响的图像，并且将显示器的等待时间的值存储在能够进行视频会议的设备中。 当选择不由显示器控制的扬声器时，视频会议会话的音频部分被重定向到那些扬声器，但延迟了与显示器的等待时间值基本上相当的时间量。 这样可以改善音频和视频同步。

    Video synchronization system
    8.
    发明授权
    Video synchronization system 有权
    视频同步系统

    公开(公告)号：US08102470B2

    公开(公告)日：2012-01-24

    申请号：US12035637

    申请日：2008-02-22

    申请人： Chowdhary Musunuri ,  Richard T. Wales

    发明人： Chowdhary Musunuri ,  Richard T. Wales

    IPC分类号： H04N5/06 ,  H03L7/00

    CPC分类号： H04N5/0733

    摘要： In one embodiment, a method for synchronizing a plurality of video signals received from one or more video sources is provided. The method includes providing one or more video sources and providing a codec including an internal reference oscillator. The method also includes generating a plurality of horizontal and vertical synchronization pulses based on the reference frequency of the internal reference oscillator, generating a composite synchronization pulse based on the plurality of horizontal and vertical synchronization pulses, and transmitting the composite synchronization pulse to the one or more video sources via a communication link. The method further includes separating the composite synchronization pulse back into the plurality of horizontal and vertical synchronization pulses, generating a pixel clock signal for the one or more video sources based on one or more of the plurality of horizontal and vertical synchronization pulses, and genlocking the one or more video sources based on the generated clock signal.

    摘要翻译： 在一个实施例中，提供了用于同步从一个或多个视频源接收的多个视频信号的方法。 该方法包括提供一个或多个视频源并提供包括内部参考振荡器的编解码器。 该方法还包括基于内部参考振荡器的参考频率产生多个水平和垂直同步脉冲，基于多个水平和垂直同步脉冲产生复合同步脉冲，并将复合同步脉冲发送到一个或 通过通信链接获得更多视频源。 该方法还包括将复合同步脉冲分离回多个水平和垂直同步脉冲，基于多个水平和垂直同步脉冲中的一个或多个产生一个或多个视频源的像素时钟信号，并将 基于生成的时钟信号的一个或多个视频源。