Television system providing wide aspect ratio image information compatible with a standard aspect ratio format
AssigneeTelefunken Fernseh und Rundfunk GmbH
InventorGerhard Holoch
Life of this patent
Estimating the term…
Abstract
A television signal processing system develops a television signal containing wide aspect ratio image information which is compatible with a standard aspect ratio television format. One image line is separated from every group of four successive image lines. The remaining image lines are vertically compressed, whereby vacant regions ("bars") appear along the top and bottom edges of a displayed image. The separated image lines are scrambled and inserted into the vacant regions. An image display including the vacant regions exhibits a standard aspect ratio, while the active image area between the vacant edge regions exhibits a wide aspect ratio.
Claims17
In a system for providing, from a widescreen television signal source, a television signal containing wide image aspect ratio information compatible with a standard television signal containing image information having an aspect ratio less than that of said compatible television signal, apparatus comprising:
- means for separating an image line from every group of N successive image lines within an image scanning interval for producing a separated line and remaining lines for each said group, where N is significantly less than the total number of lines defining an image scan within said scanning interval;
- means for processing said remaining lines of each said group to produce vacated spatial areas along top and bottom edges of an image defined by said remaining lines;
- and
- means for inserting a predetermined number of separated lines into said vacated area along said top edge, and a predetermined number of separated lines in said vacated area along said bottom edge, thereby forming an output compatible television signal for transmission.
In a system for receiving a television signal containing wide aspect ratio image information, said television signal containing a separated line from respective groups of N successive image lines within an image scanning interval and having remaining lines within each said line group, where N is significantly less than the total number of lines defining an image within said image scanning interval, said separated lines having been inserted into vacated spatial regions along top and bottom edges of an image defined by said remaining lines;
- apparatus comprising:
- means for processing said remaining lines within each said line group so as to additionally occupy said spatial regions along said top and bottom image edges;
- means for inserting said separated lines from said top and bottom edge regions into positions within each said line group previously occupied by said separated lines, respectively, to produce a wide aspect ratio signal;
- and
- display signal processing means responsive to said wide aspect ratio signal.
Dependencies are inferred from the claim text.