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    • 3. 发明申请
    • System and method for low-delay channel hopping
    • 低延迟信道跳频的系统和方法
    • US20050229221A1
    • 2005-10-13
    • US10818335
    • 2004-04-05
    • Louis KerofskyShawmin Lei
    • Louis KerofskyShawmin Lei
    • H04N5/00H04N7/16H04N7/173
    • H04N21/42607H04N21/4331H04N21/4385H04N21/44222
    • A system and method are provided for low-delay channel changes in a multicast/broadcast of compressed video. The method comprises: receiving a multicast/broadcast with a plurality of compressed video channels; buffering information from a plurality of channels; selecting a channel; and, decoding the selected channel in response to the buffered information. In some aspects, the method pre-identifies access points in the buffered information for each channel, prior to selecting the channel. Then, decoding the selected channel in response to the buffered information includes: accessing the buffered information at the pre-identified access point; and, decoding the selected channel, beginning at the access point. Alternately, access points are not pre-identified. Then, decoding the selected channel in response to the buffered information includes: discovering an access point in the information buffered for the selected channel subsequent to selecting the channel; and, decoding the selected channel, beginning at the discovered access point.
    • 提供了一种用于在压缩视频的多播/广播中的低延迟信道改变的系统和方法。 该方法包括:接收具有多个压缩视频信道的组播/广播; 从多个频道缓冲信息; 选择一个频道; 以及响应于所缓冲的信息来解码所选择的信道。 在某些方面,在选择信道之前,该方法预先标识每个信道的缓冲信息中的接入点。 然后,响应于所缓冲的信息解码所选择的信道包括:访问预先识别的接入点处的缓冲信息; 并且从接入点开始对所选频道进行解码。 或者,接入点不是预先识别的。 然后,响应于所缓冲的信息对所选择的信道进行解码,包括:在选择信道之后,发现为所选择的信道缓冲的信息中的接入点; 并从所发现的接入点开始对所选频道进行解码。
    • 7. 发明申请
    • Low-latency random access to compressed video
    • 低延迟随机访问压缩视频
    • US20050117055A1
    • 2005-06-02
    • US10726306
    • 2003-12-01
    • Louis Kerofsky
    • Louis Kerofsky
    • H04N7/26H04B1/66H04N5/44H04N5/50H04N7/12H04N7/24H04N11/04
    • H04N21/4384H04N5/4401H04N5/50H04N21/23439H04N21/2365H04N21/4347H04N21/44016H04N21/8455
    • A method and apparatus for achieving low-latency, and rapidly attained high-resolution, access reception for transmitted and received video data involving the pre-transmission dividing of a source video stream into two downstream-deliverable data streams that differ by, on the one hand, low-latency, low-resolution characteristics for one stream, and on the other hand, higher-latency, higher-resolution characteristics for the other stream. Latency in these streams is determined by the frame spacing created between stream-inserted marker I-frames. The divided streams are multiplexed and transmitted. At the receiving end, monitoring, selecting and video output-signal switching take place under rules whereby the first-encountered marker frame in either stream directs that stream to provide the first content for the video output signal. If the first-encountered marker resides in the higher-resolution stream, the process ends. If it is the lower-resolution stream, a switch to the higher-resolution stream takes place on detection of the next-encountered marker frame in the higher-resolution stream.
    • 一种用于实现低延迟和快速获得的用于发送和接收的视频数据的高分辨率访问接收的方法和装置,该视频数据涉及将源视频流的预传输划分成两个不同的可下载的数据流 一个流的低延迟,低分辨率特性,另一方面,对于其他流,更高延迟,更高分辨率的特性。 这些流中的延迟由流插入标记I帧之间产生的帧间隔确定。 划分的流被复用并传输。 在接收端,监视,选择和视频输出信号切换在规则下进行,由此任一流中的首次遇到的标记帧指示该流提供视频输出信号的第一内容。 如果首次遇到的标记位于较高分辨率的流中,则该过程结束。 如果是较低分辨率的流,则在更高分辨率流中检测到下一次遇到的标记帧时,将切换到较高分辨率的流。