Key signal producing apparatus for video picture composition

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

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358 22, H04N 5275

Patent

active

049910140

ABSTRACT:
First and second memories are provided for receiving key signals which control a display to output a video composition made up of a plurality of video signals. The key signals are received from a key signal generator in synchronism with the speed of the key signal generator. The first memory receives a key signal directly, while the second memory receives a gated key signal for storing a key signal related to, for example, a still image, and the gating is controlled so that the key signal in the second memory is only overwritten when it is expressly intended to do so. A read address generator controls the reading out of key signals from both memories, in synchronism with the speed of the display apparatus which displays the video images. A further gate may be provided to control input of key signals into the first memory, this further gate being controlled by the state of the output key signal coming from the second memory. Another aspect of the invention relates to a system comprising a plurality of first memories for receiving, storing, and outputting a plurality of key signals, respectively. A selector is provided for selecting one of the plurality of output key signals, and the selected key signal is received and stored in a second memory and outputted as a second output key signal. A priority order setting system selects and outputs the first output key signals from the first memory and the second output key signal from the second memory according to a first priority order. A second priority order setting system may select and output the first output key signals according to a second priority order.

REFERENCES:
patent: 4751579 (1988-06-01), Okunishi
patent: 4758892 (1988-07-01), Bloomfield
patent: 4831447 (1989-05-01), Lake, Jr.

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