Interface module for superimposing alphanumeric characters upon RGB video signals
First Claim
1. An interface module for superimposing alphanumeric characters upon RGB video signals, said alphanumeric characters and said RGB video signals being supplied to corresponding inputs of a SCART connector of a display device, characterized in that it basically comprises:
- a video signal generator (VDP) relevant to said alphanumeric characters it extracts from a video memory (MEMV), said generator supplying at the output three primary colour components (R, G, B) of said characters and a base-band video composite synchronism signal (SCM);
a video encoder (ENC) converting said three components of primary colours (R, G, B) and said video-composite synchronism signal (SCM) it receives from said video signal generator (VDP) in a base-band standard colour video signal (VID) which supplies at the input for alphanumeric characters of said SCART connector (SCART);
a data processing unit (CPU) which, on the basis of commands it receives from data input devices (TS, TAST, TELC, S), controls said video signal generator (VDP) supplying it with information determining the shape, type and position of the alphanumeric characters of a video page, and information relevant to different display types and such that said video-signal generator (VDP) may control the switching input (CV) of said SCART connector (SCART).
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Abstract
An interface module for superimposing alphanumeric characters upon externalGB video signals received by a SCART connector of a television set is disclosed. The interface includes a central processing unit (CPU) controlling the command input from an alphanumeric keyboard, remote control, touch screen functions, and message exchange with a processing center through the D channel of an ISDN network. The CPU controls a video display processor which outputs a switching signal to the SCART connector and R, G, B video signals to an encoder which encodes a composite color signal in a standard format such as PAL, SECAM or NTSC. The superimposing is done in the SCART connector by switching between the external R, G, B video signals and the composite color video from the encoder.
27 Citations
6 Claims
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1. An interface module for superimposing alphanumeric characters upon RGB video signals, said alphanumeric characters and said RGB video signals being supplied to corresponding inputs of a SCART connector of a display device, characterized in that it basically comprises:
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a video signal generator (VDP) relevant to said alphanumeric characters it extracts from a video memory (MEMV), said generator supplying at the output three primary colour components (R, G, B) of said characters and a base-band video composite synchronism signal (SCM); a video encoder (ENC) converting said three components of primary colours (R, G, B) and said video-composite synchronism signal (SCM) it receives from said video signal generator (VDP) in a base-band standard colour video signal (VID) which supplies at the input for alphanumeric characters of said SCART connector (SCART); a data processing unit (CPU) which, on the basis of commands it receives from data input devices (TS, TAST, TELC, S), controls said video signal generator (VDP) supplying it with information determining the shape, type and position of the alphanumeric characters of a video page, and information relevant to different display types and such that said video-signal generator (VDP) may control the switching input (CV) of said SCART connector (SCART). - View Dependent Claims (2, 3, 4, 5, 6)
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Specification