| 摘要 |
A demodulating means receiving television broadcasting electric waves and demodulating the received television video signal and multiplexed teletext signal respectively to primary color signals of R, G and B and a double speed converting means for time-axially compressing within one horizontal period the demodulated R, G and B primary color signals of both are provided so that the television video signal and teletext signal double speed converted within opne horizontal scanning period may be alternately switched by a first switching means and may be displayed on a picture tube through a driving means. Further, in the case of displaying them, by a deflecting means, the vertical amplitude can be made smaller than at the normal time and the vertical picture position can be set in a proper position. Thereby, a television video signal and teletext signal in which the horizontal amplitude and vertical amplitude are set to be, for example, 1/2 those at the normal time can be simultaneously displayed on the picture tube. |
