Patent ID: 6417888
Filing Date: 2002-07-09
Classification: H04N

Abstract:
An apparatus for scrolling an on screen display using on screen display data, wherein the on screen display data is included in an encoded video signal representing a video image, the apparatus comprising:means for receiving the encoded video signal and decoding the on screen display data as a sequence of lines of on screen display data; memory means including a first buffer and a second buffer; on screen display processing means for storing a group of lines of the sequence of lines of the on screen display data in the first buffer and alternately storing successive groups of lines of the sequence of lines of the on screen display data in the second buffer and the first buffer, wherein each successive group of lines includes a plurality of lines from the previous group of lines and is shifted by at least one line in the sequence of lines of on screen display data with respect to the previous group of lines; display means for alternately displaying the on screen display data from the first buffer and the second buffer synchronized with the storage of the successive groups of lines of the sequence of lines of the on screen display data in the second and first buffers, respectively, whereby the most recently stored group of lines is displayed.