| 摘要 |
PURPOSE:To reduce power consumption, to eliminate disturbance and to simplify circuit constitution by controlling a television receiver so as to supply power only to an FM receiver and a voice circuit when a control signal for FM broadcast reception from a transmitter is inputted. CONSTITUTION:When a control signal for receiving FM broadcast is applied from a transmitter, terminals 11, 24 and 25 go both to a high level, transistors (TRs) 12, 16 are turned on and a TR 20 is turned off. Thus, no current flows to a relay coil 22, a relay contact 4 remains opened, switch circuits 29, 35 are both closed, and a power voltage is applied from a rectifier circuit 10 to a voice demodulating circuit 30 and a voice output circuit 31 through a switch circuit 29. Further, the power voltage is applied to an FM broadcast reception section 33 and a demodulator 34 through the switch circuit 35 so as to activate an FM receiver. The operation of the television receiver is stopped and only the FM receiver is operated in this case. |
