| 摘要 |
A multiple television screen processing circuit having the teletext function. The circuit comprises a TV video signal generator for producing a TV video signal; a PIP signal generator for producing a PIP signal, an ON screen display signal generator for producing an ON screen display signal, and a teletext signal generator for producing a teletext signal, each of them being controlled by a microcomputer; a selection controller for combing logically said selection-controlling signals; a signal selector for selecting and outputting, under the control of the selection-controlling signals and the output signal of the selection controller, the TV video signal, the PIP signal, the ON screen display video signal or the teletext signal; an amplifier for amplifing the output signal of the signal selector; and a Braun tube for displaying the output signal of the amplifier. Thereby, on a screen can be simultaneously or separately displayed the TV video signal, the PIP signal and/or ON screen display signal; the teletext signal can be displayed on a screen with the ON screen display signal; or the teletext signal can be displayed on a screen with the PIP signal and the ON screen display signal. |
