JPS55132144A - Circuit selection system for television signal - Google Patents

Abstract

PURPOSE:To attain simplification and economization by eliminating the need for the conventionally-needed remote control function by transmitting signal transmission circuit information of another television station via the same transmission line as a circuit switching signal. CONSTITUTION:With regard to main circuits 4(stand-by circuit), 5(in-use telephone circuit) and 6(in-use television circuit), signals are transmitted from transmitting station 1 to receiving station 2 via intermediate repeating station 3 and as for control line 33, they are sent in the opposite direction to main circuits. Then, a B station signal can be transmitted by using the in-use television circuit (In-use television circuit input is 24 and B station signal input is 25 with television stand-by operation input.) by closing in-use television circuit selective transmitting terminal switch 26 for another television station signal (b station signal) and in-use television circuit selective receiving terminal switch 30 for the signal. Further, repeating station 3, equipped with demodulator 10 and circuit selective switches 31 and 32 selecting the B station signal transmitted via the in-use television circuit or stand-by circuit, controls switches 31 and 32 to send a B station signal video output from output 40.