公开(公告)号：US5940072A

公开(公告)日：1999-08-17

申请号：US698104

申请日：1996-08-15

申请人： Musa Jahanghir ,  Steve Blonstein ,  Ikram Jahangiri ,  Steve Jeck

发明人： Musa Jahanghir ,  Steve Blonstein ,  Ikram Jahangiri ,  Steve Jeck

IPC分类号： H04N5/445 ,  H04N21/40 ,  H04N21/434 ,  H04N7/16

CPC分类号： H04N21/40 ,  H04N21/434

摘要： A graphics data decompression arrangement in a TV set top box that includes a system ROM for storing graphics data broken down into tiles, each of which is identified by a unique index number. The index numbers that identify the tiles of graphics data required to be included in a current picture on a TV set screen are written into a DRAM. An MPEG decoder reads the index numbers to convert them into a graphics address signal supplied via a ROM address bus to the system ROM to indicate the addresses of the required tiles of graphics data. In response, the required tiles are fed to the MPEG decoder for decompression in accordance with an MPEG decompression algorithm. A time-division multiplexing scheme allows the ROM address bus to be used for transmitting to the system ROM an address signal from a CPU that indicates where information required for CPU operations is located in the system ROM. In response to the CPU address signal, the required information is fed to the CPU.

摘要翻译： 一种电视机顶盒中的图形数据解压缩装置，其包括用于存储分解成瓦片的图形数据的系统ROM，每个图形数据由唯一的索引号码标识。 识别需要包括在电视机屏幕上的当前照片中的图形数据的瓦片的索引号被写入到DRAM中。 MPEG解码器读取索引编号以将它们转换成通过ROM地址总线提供的图形地址信号到系统ROM，以指示图形数据所需的瓦片的地址。 作为响应，根据MPEG解压缩算法将所需的瓦片馈送到MPEG解码器以进行解压缩。 时分复用方案允许ROM地址总线用于向系统ROM发送指示CPU操作所需信息位于系统ROM中的CPU的地址信号。 响应于CPU地址信号，所需的信息被馈送到CPU。