| 摘要 |
PURPOSE:To increase the number of channels which can be set and to realize a multichannel remote control system that has the occurrence rate of malfunction decreased, by providing a blank unit in the repetitive period of a control signal. CONSTITUTION:When a control signal formed of a few units of modulated frequency signals F1-F4 is transmitted repeatedly at the side of transmitter 1, two blank units are provided in this repetitive period following a control signal of six units, for example, and then the control signal of six units is newly sent out. At the side of receiver 2, storage is done sequentially from the 1st unit of the control signal following the blank unit and four frequencies F1-F4 are combined into six units, so that all combinations can be utilized for channel setting. Further, when two transmitters 11 and 12 are operated simultaneously, the memory of other receiver 23 is stored with a received pattern as much as six units, so that the probability that the pattern of the channel of receiver 23 agrees will lower as much as blank units. |
