Patent ID: 6380984
Filing Date: 2002-04-30
Classification: H04N

Abstract:
A digital-television-broadcast receiving apparatus comprising:a tuner for selecting a carrier-wave component including a signal of a broadcast program selected by a command issued by the user; a front-end unit for demodulating said carrier-wave component selected by said tuner and outputting a transport stream; a selected-program extracting unit for extracting compressed data of said broadcast program selected by said command issued by the user from said transport stream output by said front-end unit; a decompression unit for decompressing said compressed data extracted by said selected-program extracting unit and for outputting a signal for presenting said selected broadcast program; a graphic processing unit for generating a signal for presenting a image based on input data by conversion of said input data into display data such as characters, figures and symbols provided in advance; and a working memory with a storage capacity large enough for storing image data of the amount of at least 1 screen to be shared by said decompression unit and said graphic processing unit as a storage unit common to said decompression unit and said graphic processing unit wherein: said selected-program extracting unit is capable of extracting presentation information included in said transport stream in accordance with a command issued by said user; a data converting unit receives said presentation information extracted by said selected-program extracting unit, converts said presentation information into input data with a format acceptable to said graphic processing unit and supplies said input data to said graphic processing unit; and said graphic processing unit generates image data for presenting images for said presentation information from said input data generated by said data converting unit by using said working memory as a work area.