| 摘要 |
PURPOSE: A method and an apparatus for reformatting auxiliary information included in television signal are provided to display the auxiliary information legibly in a location proximate an auxiliary image in a multi-image display, such as a picture-in-picture (PIP) display. CONSTITUTION: When two new closed caption characters(a character pair) are received, they are first processed by a status detector. The status detector decides which caption mode is being received, whether to keep the characters and if either of the characters is a control code. The two characters are then processed by a control code processor which decides, in response to the control codes (if any), if a carriage return needs to be inserted into the reformatted caption. Concurrently, the characters are coupled one at a time through the new-speaker identifier, character mapper, and the formatting FIFO. During these three stages, any new speakers are identified, characters are re-mapped to a new character set, and redundant spaces are removed from a character stream. Finally, a address generator constructs the reformatted caption in the buffer memory and writes the caption to a circular buffer. The circular buffer is accessible by a display generation hardware such that a comprehensive, closed caption text display is generated that has a format different from that of the standard closed caption text format.
|
