| 摘要 |
A first channel selection signal generating circuit 3 successively indicates selection of channels which can be received by an electronic tuner 1. A second channel selection signal generating circuit 4 indicates selection of a particular channel. A channel selection signal switching circuit 2 effects switching between these two outputs so as to output one of them to the electronic tuner 1. A digitizing circuit 6 converts the output from the electronic tuner 1 and a scan line converting circuit 7 outputs a signal which has been formed from the digital signal by reducing the number of horizontal scan lines so that the output is stored into a texture memory 8, as one sub-frame image for each channel. A graphics engine 9 subjects the image data loaded from the texture memory 8 to a 3D image process, forms a polyhedral icon with the sub-frame for each channel on a respective face, and stores it into a video image memory 10. A video signal selecting circuit 11 switches the output between the video signal from the electronic tuner 1 and the video signal loaded from the video image memory 10 so as to output the selected one on a display unit 12. |
