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    • 2. 发明授权
    • Apparatus and method for clock synchronization
    • 时钟同步的装置和方法
    • US07817758B2
    • 2010-10-19
    • US11965731
    • 2007-12-27
    • Xiaoyu Gao
    • Xiaoyu Gao
    • H04L7/00
    • G06F1/12
    • Techniques for synchronizing clocks are disclosed. According to one aspect of the present invention, a pair of dividing coefficients a1 and a2 is obtained from a ratio of a theoretical frequency fs1 of the first source signal to a theoretical frequency fs_local of a desired local clock signal. A least common multiple expressed as T_c is obtained from the theoretical periods T1 and T2 of the first source signal and the second source signal. A relative error expressed as k is calculated from the first and second source clock signals in a period of T_c. The first source clock signal is then divided into a first local clock signal with a period equal to T1*a1 and a second local clock signal with a period equals to T1*a2 according to the dividing coefficients a1 and a2, respectively. The clock number m of the first local clock signal and the clock number n of the second local clock signal in the period of T_c are calculated according to the relative error k and the dividing coefficients a1 and a2. The m clocks of the first local clock signal is mixed with the n clocks of the second local clock signal as m+n clocks of the desired local clock signal with the period of T_c. Thus, the local clock signal obtained as such is synchronized with both of the first and second source clock signals.
    • 公开了同步时钟的技术。 根据本发明的一个方面,从第一源信号的理论频率fs1与期望的本地时钟信号的理论频率fs_local的比率获得一对分频系数a1和a2。 从第一源信号和第二源信号的理论周期T1和T2获得表示为T_c的最小公倍数。 在T_c的周期内,从第一和第二源时钟信号计算表示为k的相对误差。 然后,第一源时钟信号分别根据分频系数a1和a2被分成周期等于T1 * a1的第一本地时钟信号和周期等于T1 * a2的第二本地时钟信号。 根据相对误差k和分割系数a1和a2,计算T_c周期中第一本地时钟信号的时钟数m和第二本地时钟信号的时钟数n。 第一个本地时钟信号的m个时钟与第二个本地时钟信号的n个时钟作为期望本地时钟信号的m + n个时钟与T_c周期混合。 因此,本来得到的本地时钟信号与第一和第二源时钟信号同步。
    • 3. 发明申请
    • Apparatus and Method for Clock Synchronization
    • 时钟同步的装置和方法
    • US20090168933A1
    • 2009-07-02
    • US11965731
    • 2007-12-27
    • Xiaoyu Gao
    • Xiaoyu Gao
    • H04L7/00
    • G06F1/12
    • Techniques for synchronizing clocks are disclosed. According to one aspect of the present invention, a pair of dividing coefficients a1 and a2 is obtained from a ratio of a theoretical frequency fs1 of the first source signal to a theoretical frequency fs_local of a desired local clock signal. A least common multiple expressed as T_c is obtained from the theoretical periods T1 and T2 of the first source signal and the second source signal. A relative error expressed as k is calculated from the first and second source clock signals in a period of T_c. The first source clock signal is then divided into a first local clock signal with a period equal to T1*a1 and a second local clock signal with a period equals to T1*a2 according to the dividing coefficients a1 and a2, respectively. The clock number m of the first local clock signal and the clock number n of the second local clock signal in the period of T_c are calculated according to the relative error k and the dividing coefficients a1 and a2. The m clocks of the first local clock signal is mixed with the n clocks of the second local clock signal as m+n clocks of the desired local clock signal with the period of T_c. Thus, the local clock signal obtained as such is synchronized with both of the first and second source clock signals.
    • 公开了同步时钟的技术。 根据本发明的一个方面,从第一源信号的理论频率fs1与期望的本地时钟信号的理论频率fs_local的比率获得一对分频系数a1和a2。 从第一源信号和第二源信号的理论周期T1和T2获得表示为T_c的最小公倍数。 在T_c的周期内,从第一和第二源时钟信号计算表示为k的相对误差。 然后,第一源时钟信号分别根据分频系数a1和a2被分成周期等于T1 * a1的第一本地时钟信号和周期等于T1 * a2的第二本地时钟信号。 根据相对误差k和分割系数a1和a2,计算T_c周期中第一本地时钟信号的时钟数m和第二本地时钟信号的时钟数n。 第一个本地时钟信号的m个时钟与第二个本地时钟信号的n个时钟作为期望本地时钟信号的m + n个时钟与T_c周期混合。 因此,本来得到的本地时钟信号与第一和第二源时钟信号同步。
    • 4. 发明申请
    • Apparatus and Method for Synchronizing Video and Audio Data
    • 用于同步视频和音频数据的装置和方法
    • US20090167943A1
    • 2009-07-02
    • US11965728
    • 2007-12-27
    • Xiaoyu GaoFen Zhou
    • Xiaoyu GaoFen Zhou
    • H04N9/475
    • H04N21/4341H04N5/04H04N21/2368H04N21/4143H04N21/4223H04N21/4305H04N21/4307H04N21/43632H04N21/4425
    • Techniques for synchronizing audio and video data being transferred from one device to another device are disclosed. According to one aspect of the present invention, a periodic signal is generated in a host device (e.g., a personal computer) and transferred to a thin device (e.g., a PC camera) via an interface (e.g., a USB). The periodic signal is used to adjust local clocks in the thin device to generate audio and video data. As a result, the audio and video data is synchronized. According to another aspect of the present invention, an error detection unit and a correction unit are provided to ensure that there is no error in the periodic signal being transferred from the host device. If an error is detected, a patch to the signal is generated.
    • 公开了将从一个设备传送到另一个设备的音频和视频数据同步的技术。 根据本发明的一个方面,在主机设备(例如,个人计算机)中产生周期性信号,并且经由接口(例如,USB)将其传送到薄设备(例如,PC摄像机)。 周期信号用于调整薄设备中的本地时钟以产生音频和视频数据。 结果,音频和视频数据被同步。 根据本发明的另一方面,提供了错误检测单元和校正单元,以确保在从主机设备传送的周期信号中没有错误。 如果检测到错误,则生成信号的补丁。