Digital broadcast receiving apparatus and digital broadcast receiving method

A digital broadcast receiving apparatus that receives electrical wave of a digital broadcast and outputs video data of the digital broadcast, said digital broadcast receiving apparatus comprising:

• a first channel selection control unit configured to select a first channel of the digital broadcast;
• a second channel selection control unit configured to select a second channel of the digital broadcast;
• a first front-end unit configured to demodulate the electrical wave of the digital broadcast of the channel selected by said first channel selection control unit into first digital signals;
• a second front-end unit configured to demodulate the electrical wave of the digital broadcast of the channel selected by said second channel selection control unit into second digital signals;
• a first demultiplexing unit configured to demultiplex encoded video data and data broadcast data from the first digital signals;
• a second demultiplexing unit configured to demultiplex encoded video data and data broadcast data from the second digital signals;
• a video decoder which decodes the encoded video data demultiplexed by said first demultiplexing unit;
• a data broadcast accumulation unit having a storage region for each channel and configured to accumulate the data broadcast data demultiplexed by said second demultiplexing unit in the storage region of the channel selected by said second channel selection control unit;
• a rendering unit configured to generate picture data of data broadcast data of at least one channel which includes a channel different from the channel of the electrical wave of the digital broadcast demodulated by said first front-end unit in accordance with the data broadcast data accumulated in said data broadcast accumulation unit;
• and
• a video composition unit configured to generate synthesized video data by combining the video data decoded by said video decoder and the picture data generated by said rendering unit.

A digital broadcast receiving apparatus that receives electrical wave of a digital broadcast and outputs video data of the digital broadcast, said digital broadcast receiving apparatus comprising:

• a first channel selection control unit configured to select a first channel of the digital broadcast;
• a second channel selection control unit configured to select a second channel of the digital broadcast;
• a first front-end unit configured to demodulate the electrical wave of the digital broadcast of the channel selected by said first channel selection control unit into first digital signals;
• a second front-end unit configured to demodulate the electrical wave of the digital broadcast of the channel selected by said second channel selection control unit into second digital signals;
• a first demultiplexing unit configured to demultiplex encoded video data and data broadcast data from the first digital signals;
• a second demultiplexing unit configured to demultiplex encoded video data and data broadcast data from the second digital signals;
• a video decoder which decodes the encoded video data demultiplexed by said first demultiplexing unit or said second demultiplexing unit;
• a data broadcast accumulation unit having a storage region for each channel and configured to accumulate the data broadcast data demultiplexed by said first demultiplexing unit in the storage region of the channel selected by said first channel selection control unit and accumulate the data broadcast data demultiplexed by said second demultiplexing unit in the storage region of the channel selected by said second channel selection control unit;
• a rendering unit configured to generate picture data of data broadcast data of at least one channel which includes a channel different from the channel of the electrical wave of the digital broadcast demodulated by said first front-end unit or said second front-end unit in accordance with the data broadcast data accumulated in said data broadcast accumulation unit;
• and
• a video composition unit configured to generate composite video data by combining the video data decoded by the video decoder and the picture data generated by said rendering unit.

A digital broadcast receiving method of receiving electrical wave of a digital broadcast and outputting video data of the digital broadcast, comprising:

• selecting a channel of the digital broadcast;
• obtaining video data and data broadcast data from electrical wave of the digital broadcast of the channel selected in said selecting;
• accumulating, for each channel, the data broadcast data obtained in said obtaining in a data broadcast accumulation unit;
• and
• generating composite video data by reading out the data broadcast data of at least one channel that includes a channel different from a channel of the video data obtained in said obtaining from said data broadcast accumulation unit and combining the readout data broadcast data and the video data obtained in said obtaining.