| 摘要 |
PURPOSE: A two screen display device of an SD grade video using an HD grade video decoder is provided to simultaneously decode two SD grade bit streams using a video decoder which is used in a digital TV of an ATSC standard. CONSTITUTION: A sequence header is transferred by greater than a picture data level of an MPEG-2 video stream. The first and second register sets(107,108) store parameters of each bit stream which have a sequence extension, an extension and user data, and a picture header. A bit stream controller(109) selects one of two SD grade bit streams, and selects and outputs parameters stored in the first and second register sets(107,108) suited to the selected bit stream. The bit stream controller(109) includes a multiplexor. An MPEG-2 video decoder outputs the encoded bit stream and parameters from the bit stream controller(109) as two decoded videos formed by a variable length coding, a reverse quantization, a reverse discrete cosine conversion and a motion compensation. |
