| 摘要 |
PURPOSE:To facilitate the changing and set of channels and prevent wrong operation due to radio interference by arranging a number of modulation frequencies in time sequence and establishing channels and an arranging channel establishing part on each transmitter and receiver. CONSTITUTION:The modulated-wave generating circuit 6 of a transmitter 1 selects the modulation frequency of a channel establishing part 4, and designates a timing in time sequence to frequency-dive the standard lock signals which are generated by a standard signal generating circuit 10, and said signals are applied to a modulation circuit 7 and transmitted from a carrier-wave generating circuit 11. Said modulated carrier-wave signals are amplified and modulated in the front end 13 of a receiver 2 and applied to the filter circuits 8i - 84 through an amplifier 14, and corresponding outputs are generated in a discriminating circuit 9. The discriminating circuit 9 discriminates output order and compares said order with the establishment order of a channel establishing part 5 and discriminates that the self-channel of the receiver 2 is called, and controls an outside load 3 according to the signal contents. |
