Closed-caption scrolling method and apparatus suitable for syllable characters

DETAILED DESCRIPTION It is an object of the present invention to solve the problems involved in the prior art, and to provide a method of scrolling a closed-caption especially including syllable characters.
It is another object of the present invention to provide a method of scrolling a closed-caption which can reduce the memory capacity of a receiving buffer by scrolling the pop-on caption words.
In one aspect of the present invention, there is provided a closed-caption scrolling method wherein a broadcasting station encodes a caption signal in a line of each field of a television broadcasting signal which does not affect the broadcasting signal to transmit the encoded caption signal, and a receiver receives and displays the caption signal on a screen, the method comprising the steps of producing a control code for controlling a size of a scroll region and a scroll direction, and displaying character information following the control code on the scroll region determined by the control code, by scrolling the character information in a direction determined by the control signal.
In another aspect of the present invention, there is provided a closed caption pop-on scrolling method wherein a broadcasting station encodes a caption signal in a line of each field of television broadcasting signal which does not affect the broadcasting signal to transmit the encoded caption signal, and a receiver receives and displays the caption signal on a screen, the method comprising the steps of extracting the caption signal from a received television video signal, restoring digital data from the extracted caption signal, checking whether or not the restored data corresponds to a pop-on mode, deleting commands for receive/store and off-display from a control code if it is checked that the restored data corresponds to the pop-on mode, reading out character data corresponding to a character code from a font read only memory (ROM) which stores therein the character data complying with a syllable character completion type code to store the read-out character data in a display memory; converting the character data stored in the display memory into a video signal to display the video signal on the screen, and scrolling pop-on characters displayed on the screen in response to a row-change control code