Importance

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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.

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First Claim