Apparatus and method for creating digitally remodulated video fr

Details Apparatus and method for creating digitally remodulated video fr Apparatus and method for creating digitally remodulated video fr

1989-04-14

1991-04-16

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 22, H04N 965

Patent

active

050087401

ABSTRACT:
Apparatus and methods for remodulating digital luminance and color difference components for display as PIP information, or together with other composite video components for multi-PIP and test pattern applications are disclosed. A digital encoder is used for conducting a digital quadrature modulation on the color difference components and for digitally adding the luminance signal thereto prior to the converting of the remodulated information into an analog format. Preferably, the digital video information output by the encoder is in the form Y1+(R-Y)1, Y1 +(B-Y)1, Y2-(R-Y)1, Y2-(B-Y)1, Y3+(R-Y)2. Y3+(b-Y)2, Y4 -(R-Y)2, . . . , where Y is the luminance component, R-Y and B-Y are color difference components, and where the numbers index received samples of the video components with the luminance component being sampled at twice the frequency of the color difference components. Where digitally modulated composite video is desired, fixed black level, burst, and background values are multiplexed with the active R-Y and B-Y signals, while fixed sync tip, black level, and background values are multiplexed with the active Y signals prior to encoding.

REFERENCES:
patent: 4063280 (1977-12-01), Hattori et al.
patent: 4352122 (1982-09-01), Reitmeier et al.
patent: 4533936 (1985-08-01), Tiemann et al.
patent: 4712130 (1987-12-01), Casey
patent: 4782391 (1988-11-01), McNeely et al.

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