Television – Format conversion – Line doublers type
Patent
1995-02-17
1996-07-09
Kostak, Victor R.
Television
Format conversion
Line doublers type
348458, 348910, H04N 701
Patent
active
055349366
ABSTRACT:
An improved apparatus for reducing flickers of an encoder capable of advantageously reducing flickers occurred when video signals are converted from a non-interlace scanning method to an interlace scanning method in the digital method, which includes a graphic controller for outputting a pixel signal by a line unit and for outputting a pixel clock, a horizontal synchronous signal and a vertical synchronous signal; a synchronous signal converter for converting a pixel clock, a horizontal synchronous signal and a vertical synchronous signal outputted from the graphic controller to a pixel clock, a horizontal synchronous signal and a vertical synchronous signal of an interlace scanning method; a control signal generator for outputting a control signal by receiving a pixel clock, a horizontal synchronous signal and a vertical synchronous signal of an interlace scanning method outputted from the synchronous signal converter; a line store unit for selecting a pixel data corresponding to nth even scanning line among the output signals of the graphic controller and for writing/reading the selected pixel data in accordance with a control signal of the control signal generator; a multiplexer for selecting and outputting a pixel data of a scanning line adjacent thereto among the output signals of the line store unit; a digital added for adding a pixel data of a scanning line adjacent thereto outputted from the multiplexer; a shifting unit for computing average value of pixel data at a scanning line adjacent thereto by receiving an output signal of the digital adder; an encoder for encoding a signal outputted from the shifting unit; and an oscillator for transmitting clocks to the control signal generator and the shifting unit.
REFERENCES:
patent: 4455572 (1984-01-01), Malden
patent: 4720745 (1988-01-01), Deforest et al.
patent: 5182643 (1993-01-01), Futscher
Acosta Juan G.
Goldstar Co. Ltd.
Kostak Victor R.
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