Vertical Scanning

sequential (line by line) discrete scanning of a television image in a vertical direction. A vertical scanning generator with a deflecting system moves the electronic beam from top to bottom linearly over time (direct stroke) on the screen of the kinescope or photosensitive (target) electrode of the pick-up tube and then returns rapidly to the initial position (back stroke). The duration of the back stroke is nearly 8 percent of the scan period. The vertical sweep frequency (frame frequency)is equal to the rated frequency of the commercial mains (50 or60 cycles per sec).

单词	vertical scanning
释义	Vertical Scanning Vertical Scanning sequential (line by line) discrete scanning of a television image in a vertical direction. A vertical scanning generator with a deflecting system moves the electronic beam from top to bottom linearly over time (direct stroke) on the screen of the kinescope or photosensitive (target) electrode of the pick-up tube and then returns rapidly to the initial position (back stroke). The duration of the back stroke is nearly 8 percent of the scan period. The vertical sweep frequency (frame frequency)is equal to the rated frequency of the commercial mains (50 or60 cycles per sec).
随便看	nonincumbent nonindependence nonindigenous nonindigenous aquatic nuisance prevention and control act non-indigenous estuarine and marine organisms non-indigenous marine species non-indigenous minority language non-indigenous organism non-indigenous species nonindividual noninductive noninductive capacitor noninductive resistor noninductive winding nonindulgence nonindulgent nonindulgently nonindustrial non-industrial disability insurance non-industrial facilities nonindustrialized nonindustrially non-industrial private forest non-industrial private forest owner nonindustrial timber management plan