EP0366871A2
Expired / Lapsed
EP
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Apparatus for processing video signal
Assignee: Mitsubishi Electric Corp
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Filing: 1989-07-21
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Granted: —
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Expires: 2009-07-21
Abstract
Abstract An apparatus for processing a video signal related to signal processing for use in superimposing a graphic image such as characters and patterns on a video signal, in which two buses being conventionally necessary for controlling displaying contents are decreased to a single bus (20) over which the graphic image data and process control command are transmitted by time-division multiplexing at the timings in synchronism with the video signal, whereby its hardware structure is simplified and, in addition, it is made possible to perform smooth switching over between different display contents.
Inventors
- 👤 Zenichiro Hara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 03:22
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/272; H04N5/44; H04N5/445; H04N5/44504
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
An apparatus for processing a video signal comprising: a first memory for storing video image data obtained from a video signal; a second memory for storing graphic image data such as characters and patterns; a first bus connected to both said first and said second memories for selectively reading and outputting one of both the image data stored in said first and said second memories; a second bus connected to both said first and said second memories for transmitting said graphic image data stored in said second memory and transmitting necessary data for processing both said image data, control command signals, and others by time-division multiplexing; and a signal generating unit for synchronous control over the time-division multiplexing transmission of said second bus in such a way that said graphic image data is transmitted to said second memory during the scanning period of said video signal and the data necessary for processing said video image data, control command signals, and others are transmitted to said first memory during the flyback period of said video signal.
Claim 2
Independent Claim
175 words
An apparatus for processing a video signal comprising: a first memory for storing video image data obtained from a video signal; a second memory for storing graphic image data such as characters and patterns; a first bus connected to both said first and said second memories for selectively reading and outputting one of both the image data stored in said first and said second memories; a second bus connected to both said first and said second memories for transmitting said graphic image data stored in said second memory and transmitting necessary data for processing both said image data, control command signals, and others by time-division multiplexing; and a signal generating unit for synchronous control over the time-division multiplexing transmission of said second bus in such a way that said graphic image data is transmitted to said second memory during the scanning period of said video signal and the data necessary for processing said video image data, control command signals, and others are transmitted to said first memory during the flyback period of said video signal.
Claim 3
Dependent Claim
38 words
An apparatus for processing a video signal according to claim 1, wherein said signal generating unit is connected to control means through a simple, standardized interface and said control means is adapted to control said signal generating unit.
Claim 4
Dependent Claim
28 words
An apparatus for processing a video signal according to claim 2, wherein said control means is constituted of general-purpose hardware such as a personal computer on the market.
Claim 5
Dependent Claim
28 words
An apparatus for processing a video signal according to claim 2, wherein said signal generating unit has a third memory for storing graphic image data of plural frames.
Claim 6
Dependent Claim
31 words
An apparatus for processing a video signal according to claim 2 or claim 4, wherein said signal generating unit has a disk unit for storing graphic image data of plural frames.
References Cited (Backward Citations)
No citation records indexed.
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