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    • 11. 发明申请
    • STREAM CLOCK RECOVERY IN HIGH DEFINITION MULTIMEDIA DIGITAL SYSTEM
    • 高定义多媒体数字系统中的时钟恢复
    • US20110075782A1
    • 2011-03-31
    • US12571210
    • 2009-09-30
    • Xiaoqian ZhangShubing ZhaiYanbo Wang
    • Xiaoqian ZhangShubing ZhaiYanbo Wang
    • H04L7/00
    • H04J3/062G09G5/008H03L7/193H03L7/1978H04N21/4122H04N21/4307
    • The present disclosure provides techniques for recovering source stream clock data at the sink in a high definition multimedia digital content transport system. The disclosure includes a fractional-N Phase-Locked Loop (PLL) based clock generator, a programmable Sigma-Delta Modulator (SDM), and a clock data calibrator to fully recover the original source stream clock data. The fractional-N PLL provides flexible source stream clock recovery. When there is a frequency deviation between the original clock and the regenerated clock, the clock data calibrator control circuit adjusts the clock data, preventing any stream data buffer overflow or underflow problems. The disclosed techniques are compatible with the sink devices based on the standards of DisplayPort and HDMI.
    • 本公开提供了用于在高清晰度多媒体数字内容传输系统中的信宿处恢复源流时钟数据的技术。 本公开包括基于分数N锁相环(PLL)的时钟发生器,可编程Σ-Δ调制器(SDM)和时钟数据校准器,以完全恢复原始源流时钟数据。 分数N PLL提供灵活的源流时钟恢复。 当原始时钟与再生时钟之间存在频率偏差时,时钟数据校准器控制电路调整时钟数据,防止任何流数据缓冲区溢出或下溢问题。 所公开的技术基于DisplayPort和HDMI的标准与宿设备兼容。
    • 16. 发明申请
    • METHOD AND CIRCUIT FOR DISPLAYPORT VIDEO CLOCK RECOVERY
    • 显示视频时钟恢复的方法和电路
    • US20110267116A1
    • 2011-11-03
    • US12675106
    • 2010-01-19
    • Lu YangSibing WangXiaoqian Zhang
    • Lu YangSibing WangXiaoqian Zhang
    • H03L7/08
    • H03L7/0807H03L7/16
    • A method and a circuit are described for recovery of video clocks for a DisplayPort receiver. The disclosure includes two clock dividers, a direct digital synthesis (DDS), a fixed multiplier Phase-Locked Loop (PLL) on a DisplayPort video system. A DisplayPort receiver link clock is divided to a lower frequency as the input of the DDS which can lower the performance requirement on a DDS circuit. The output from a time stamp value indirectly controls a direct digital synthesis device, which then drives a PLL to generate the recovery clock signal. The technique is suitable for implementation on an integrated circuit and Field Programmable Gate array system.
    • 描述了一种用于恢复DisplayPort接收机的视频时钟的方法和电路。 本公开包括两个时钟分频器,直接数字合成(DDS),DisplayPort视频系统上的固定乘法器锁相环(PLL)。 DisplayPort接收器链路时钟被划分为较低频率作为DDS的输入,这可以降低DDS电路的性能要求。 来自时间戳值的输出间接地控制直接数字合成装置,然后驱动PLL以产生恢复时钟信号。 该技术适用于集成电路和现场可编程门阵列系统的实现。