Video signal generating circuit for use in video tape recorder a

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358 22, 358183, H04N 514, H04N 974, H04N 5262

Patent

active

050459449

ABSTRACT:
A sub-screen generator used in displaying a single or a plurality of sub-screens concurrently with a main screen when reproducing video signals on TV. The sub-screen generator includes a microcomputer for producing ON/OFF signals to enable or disable a sub-screen and a plurality of signals including a signal directing a start position of the present sub-screen; a destination location decoder coupled to the microcomputer for decoding a destination location of the sub-screen on the main screen and generating control signals; a first register for storing row starting locations of a plurality of sub-screens; a second register for storing column starting locations of said sub-screens; first and second multiplexers which respectively receive the control signals of said destination location decoder and the data according to the row and column starting locations of said registers, and therefrom deliver each output to third and fourth registers; the third and fourth registers respectively provide the starting location data from the multiplexers the adjusting means providing starting location data for display, as output signals at respective output terminals, output terminals providing the output signals as feedback data to the third and fourth registers, respectively offset stages for providing control deviation data to the adjusting means to be added to or subtracted from the feedback data to produce further output signals at respective outputs for display and feedback, thereby adjusting the row and column position thereby adjusting the row and column of the sub-screens; and a counter which generates a signal for controlling the period of the data applied from the registers to the adjusting means.

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