Graphics decompression using system ROM indexing in TV set top box
First Claim
1. A system for decompressing graphics data, comprising:
- a central processing unit (CPU),a decoder controlled by said CPU for decompressing the graphics data, anda system ROM coupled to said decoder for storing the graphics data to be decompressed, and for supplying said decoder with the graphics data in response to a graphics address signal provided by said decoder to said system ROM.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. A system for decompressing graphics data, comprising:
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a central processing unit (CPU), a decoder controlled by said CPU for decompressing the graphics data, and a system ROM coupled to said decoder for storing the graphics data to be decompressed, and for supplying said decoder with the graphics data in response to a graphics address signal provided by said decoder to said system ROM. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A television system comprising:
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a transmitter for generating a stream of digital packets representing video and audio signals compressed in accordance with a compression algorithm, and a receiver for receiving said stream of digital packets, decompressing said video and audio signals in accordance with a decompression algorithm, and supplying said decompressed signals to a TV set, said receiver including; a CPU, a system ROM for storing graphics data to be displayed by said TV set, and an MPEG decoder controlled by said CPU for decompressing said graphics data, together with said video and audio signals, said MPEG decoder supplying said system ROM with a graphics address signal to receive said graphics data directly from said system ROM. - View Dependent Claims (17, 18, 19)
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20. A method of graphics data decompression comprising the steps of:
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storing graphics data in a ROM, dividing said graphics data into data blocks identified by index numbers, storing said index numbers in a RAM, reading said index numbers from said RAM to generate an address signal for accessing said ROM, retrieving said graphics data from said ROM in response to said address signal, and decompressing said graphics data.
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Specification