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    Television interval timer employing digital techniques
    6.
    发明授权
    Television interval timer employing digital techniques 失效
    电视间隔定时器采用数字技术

    公开(公告)号：US4240100A

    公开(公告)日：1980-12-16

    申请号：US18457

    申请日：1979-03-08

    Applicant: Jonathan M. Gorbold ,  David H. Slim

    Inventor： Jonathan M. Gorbold ,  David H. Slim

    IPC: H04N17/02 ,  H04N9/62

    CPC classification number: H04N17/02

    Abstract: A television interval timer generates a plurality of gating waveforms which when applied to digital circuitry, serve to gate out various portions of a television waveform determinative of a parameter to be measured. The parameter to be measured is selected by means of a selector panel which assigns a predetermined address to that parameter. The address is employed to select the proper gating waveform, the reference level at which the measurement is to be made, and the transition at the start and finish of the measurement. A counter is controlled to count a number of transitions which occur during the selected interval and which is a direct indication of the duration or timing interval associated with the parameter selected. The contents of the counter are directly displayed on a digital display to enable the user to directly view the parameter measured. The interval timer is capable of performing measurements on selected parameters which occur on a line to line basis and on parameters which occur on a field basis. Certain parameters are measured in a minimum mode. In this mode, the smallest value of the parameter as occuring during a number of samples is displayed. In an average mode, the average value of the parameter is displayed. Certain other parameters are measured by a direct measurement such as an analog to digital conversion. All measurements are made between standard operating levels and hence, the user is assured that the measurement displayed is not only correct in regard to its time, but also has been made between specific amplitude levels.

    Abstract translation: 电视间隔定时器产生多个选通波形，当施加到数字电路时，用于对要测量的参数确定的电视波形的各个部分进行选通。 要测量的参数通过选择面板来选择，该选择器面板为该参数分配预定的地址。 该地址用于选择合适的门控波形，进行测量的参考电平以及测量开始和结束时的转换。 控制计数器以计数在所选间隔期间发生的转换次数，并且其是与所选参数相关联的持续时间或定时间隔的直接指示。 计数器的内容直接显示在数字显示屏上，使用户能够直接查看测量的参数。 间隔定时器能够对在线对准的基于现场发生的参数的选定参数进行测量。 某些参数以最小模式进行测量。 在该模式下，显示在多个采样期间发生的参数的最小值。 在平均模式下，显示参数的平均值。 某些其他参数通过诸如模数转换的直接测量来测量。 所有测量都在标准操作水平之间进行，因此用户确保所显示的测量值不仅对于其时间而言是正确的，而且在具体的幅度水平之间进行。

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