| 摘要 |
A television set having more than one tuner and a multi-image displaying feature which controls the location of images on the television screen such that the characters and graphics transmitted in the form of teletext/data transmission signals or supplementary programs are displayed in predetermined locations of the screen to avoid confusion with the conventional television program. The first video signal from a first video tuner is fed through a video processing circuit to a teletext/data transmission decoder, which decodes the transmission or supplementary program. The data transmission or supplementary program is synthesized with the video signal to display the conventional television program with the data transmission or supplementary program text or graphics, which are placed at a predetermined location on the display screen. The second video signal from a second video tuner is fed through a video processing circuit to a data transmission or supplementary program detector. Upon detecting a data transmission signal or supplementary program, the data transmission detector alerts the main controller. If the seconds video signal contains a data transmission signal or supplementary program, whereas the first video signal does not, the main controller tunes the first tuner to receive the supplementary program. With this arrangement, the characters and graphics of supplementary programs are automatically displayed on a predetermined location on the television screen to avoid confusion with the conventional television program.
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