Delay time measurement system

Abstract

To appropriately and efficiently obtain light sensor output levels at the time of blackout and at the time of lighting of a light source before video delay measurement and, furthermore, appropriately cope with a relation between a repeated measurement period and an operation period of a system to be measured.SOLUTION: There is used a delay time measurement system that before delay time measurement, makes a light source repeat OFF / ON and acquires a first signal value from a light sensor before timing of transition from OFF to ON and a second signal value from the light sensor after lapse of a previously set guard time after the transition and, at measurement of a time difference, calculates a delay time from timing of variation of the light source and timing at which a signal from the light sensor crosses a threshold on the basis of the first and second signal values. There is used a delay time measurement system that at the time of the delay time measurement, makes a repeating period at the time of the light source repeating OFF and ON be non-integral multiple of operation repeating of a system to be measured or determined to be a random number.SELECTED DRAWING: Figure 4

Images