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    • 4. 发明授权
    • Redundant clock system utilizing nonsynchronous oscillators
    • 冗余时钟系统利用非同步振荡器
    • US4254492A
    • 1981-03-03
    • US25816
    • 1979-04-02
    • Thomas C. McDermott, III
    • Thomas C. McDermott, III
    • G04C13/04G04G7/00G06F11/16G04F8/00G04B17/12H03B27/00
    • G06F11/1604G04C13/0409G04G7/00G06F11/1608G06F11/20
    • A clock system is disclosed having two identical clocks not synchronized with each other. Each of the clocks includes a circuit for selecting the output of one of the clocks as the present system output. Further, each clock includes logic for detecting errors in the operation of itself, and of the other. When an error is detected in the operation of the clock selected to be the present system output, a switchover sequence control switches the output signal of the nonselected clock to become the new system output. The switchover sequence control includes a feature which ensures that the interval between pulses in the system output is greater than a predetermined period in order to minimize detrimental effects on circuitry utilizing the clock system output.
    • 公开了一种具有彼此不同步的两个相同时钟的时钟系统。 每个时钟包括用于选择其中一个时钟的输出作为当前系统输出的电路。 此外,每个时钟包括用于检测其自身的操作中的错误的逻辑和另一个的逻辑。 当在选择为当前系统输出的时钟的操作中检测到​​错误时,切换顺序控制切换非选定时钟的输出信号,成为新的系统输出。 切换顺序控制包括确保系统输出中的脉冲之间的间隔大于预定周期的特征,以便最小化利用时钟系统输出的电路的不利影响。