vertical retrace

vertical retrace

[′vərd·ə·kəl ′rē‚trās]
(electronics)
The return of the electron beam to the top of the screen at the end of each field in television.
References in periodicals archive ?
Even if each line were unique, this easily accommodates the video lines, dummy lines and vertical retrace for the 1,080 format.
The monitor had a refresh rate of 60 Hz; the stimulus timing was controlled by use of the vertical retrace flag of the video card and the stimuli were redrawn during the vertical retrace which meant stimuli were presented for durations that were multiples of approximately 17 ms.