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    • 16. 发明申请
    • Transport delay and jitter measurements
    • 传输延迟和抖动测量
    • US20080080605A1
    • 2008-04-03
    • US11529856
    • 2006-09-28
    • Kan TanJohn C. CalvinKalev Sepp
    • Kan TanJohn C. CalvinKalev Sepp
    • H04B3/46
    • H04L1/205G01R29/26G01R31/31709
    • A method of measuring transport delay and jitter with a realtime oscilloscope using cross-correlation acquires waveforms from two test points in a system under test. Clock recovery is run on both waveforms to obtain respective rates and offsets. A time offset between the two waveforms is computed. The jitter from the two test points is filtered and a mean-removed cross-correlation coefficient is computed from the filtered jitters. A fractional delay is computed using interpolation based on LMS error, and the respective computational components are summed to compute a transport delay between the two test points. The transport delay may be used to adjust clock edges from one waveform for comparison with data transition edges of the other waveform to measure jitter.
    • 使用互相关的实时示波器测量传输延迟和抖动的方法从被测系统的两个测试点获取波形。 在两个波形上运行时钟恢复以获得相应的速率和偏移量。 计算两个波形之间的时间偏移。 对两个测试点的抖动进行滤波,并从滤波的抖动中计算平均去除的互相关系数。 使用基于LMS误差的插值计算分数延迟,并将相应的计算组件相加以计算两个测试点之间的传输延迟。 传输延迟可用于从一个波形调整时钟边沿,以便与其他波形的数据转换边沿进行比较,以测量抖动。
    • 20. 发明申请
    • HIGH-LEVEL DATABASE MANAGEMENT SYSTEM
    • 高级数据库管理系统
    • WO2006113903A2
    • 2006-10-26
    • PCT/US2006/015039
    • 2006-04-20
    • THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISLEETARU, KalevCRAIG, Alan
    • LEETARU, KalevCRAIG, Alan
    • G06F7/00
    • G06F17/30893Y10S707/99935
    • A method and system for allowing end users to create a database and a user interface to interact with database data are provided. The database management system provides a database abstraction layer that hides the complexities of a database and vendor-specific implementation details from the end user, while still allowing the end user to perform powerful database tasks. The database management system allows an end user with little or no knowledge about databases to create, edit, and maintain a database without understanding the details behind the database. The database management system also provides a facility for the easy creation of web pages to access the database to provide features such as searching, data entry, and browsing data stored in the database.
    • 提供了一种用于允许最终用户创建数据库和用于与数据库数据交互的用户界面的方法和系统。 数据库管理系统提供一个数据库抽象层,它从最终用户隐藏数据库的复杂性和供应商特定的实现细节,同时仍允许最终用户执行强大的数据库任务。 数据库管理系统允许具有很少或根本没有关于数据库知识的最终用户在不了解数据库背后的细节的情况下创建,编辑和维护数据库。 数据库管理系统还提供了一种便于创建网页以访问数据库以提供诸如搜索,数据输入和浏览存储在数据库中的数据的特征的设施。