procedures for the transfer of a fernsehsignals, a begleitsignals and steuersignals to grossbild / kleinbilddarstellung

摘要

At the transmitter a TV signal, an accompanying videotext signal and a screen display control signal generated by separate circuits (1-3) are combined (4) into a TDM digital signal for conversion (5) into a high-frequency signal and transmission from the antenna (7). The receiving antenna (8) feeds a tuner and IF stage (9), a picture signal processing circuit (10) and memory (11), and a videotext decoder (14) with memory which separates the control signal (S5) for a microprocessor (16) linked to a remote control receiver (15). The memories are read (S6,S7) selectively for presentation (12) of three-colour images and text in separate areas on the screen (13).