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US4070664A Key controlled digital system having separated display periods and key input periods 失效
键控数字系统具有分离的显示周期和键输入周期

Key controlled digital system having separated display periods and key input periods
摘要：
In a digital system including a digital computing module which generates a repeating sequential series of first pulses and a group of second pulses simultaneously with each of first pulses for energizing a dynamic numerical display device and to which key input information is coupled as timing pulses, during a first period of a predetermined time interval the display device is driven by the first and second pulses while during a second period of the predetermined time interval the display device is not driven but the timing pulses are coupled to the computing module.
摘要（中）：

在包括数字计算模块的数字系统中，数字计算模块产生与用于激励动态数字显示装置的每个第一脉冲同时发生的重复的连续的第一脉冲序列和一组第二脉冲，以及哪个键输入信息作为定时脉冲耦合， 在预定时间间隔期间，显示装置由第一和第二脉冲驱动的第一时段，而在预定时间间隔的第二周期期间，显示装置不被驱动，但定时脉冲耦合到计算模块。

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