Television picture overlay management device

Details Television picture overlay management device Television picture overlay management device

1988-01-21

1989-09-12

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340734, H04N 5272

Patent

active

048665240

ABSTRACT:
In a system in which there are available several pictures the device according to the invention enables the management of the overlays of pictures by implementing a mechanism according to which transition points are defined during the scanning. At these transition points, the mode of display changes. The horizontal position of these points and the nature of the display change are contained in a special register (13). An abscissa comparator (12) continuously compares the current abscissa and the abscissa indicated in the register (13) and, after an abscissa identity has been found and a new overlay mode has been set up, the next word in the register (13) is taken into account. Means (5, 8) enable the content of the register (13) to be reloaded during the line scan return periods.

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patent: 4768083 (1988-08-01), Romesburg
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