Patent ID: 6262775
Filing Date: 2001-07-17
Classification: H04N

Abstract:
A caption data processing circuit, comprising:an extracting circuit that extracts presentation information and caption data from an input transport stream to generate a control signal when caption data has been extracted;a caption decoder that decodes the extracted caption data in response to the control signal, to control timing of presentation of the decoded caption data based on the presentation information; anda memory for storing the extracted presentation information and caption data,wherein the extracting circuit comprises:a video decoder for extracting the presentation information and the caption data from the input transport stream to output the presentation information, information about the amount of caption data, and the caption data, and generating said control signal when caption data has been extracted;a first buffer for temporarily storing the information about the amount of caption data extracted by the video decoder; anda second buffer for reading from the memory the presentation information and the caption data, in units of a predetermined number of bytes, wherein presentation information and caption data, in units of said predetermined number of bytes, are temporarily stored in said second buffer.