| 摘要 |
PURPOSE:To facilitate the understanding as well as enhance the controllability without increasing the size by providing the switch board to the keyboard to the case of the remote control transmitter. CONSTITUTION:When switch board 19 is closed, the button of switch 17 is pushed to secure the closure state. Thus the subcarrier is generated for the 1st frequency which is modulated by the pulse produced in accordance with the indication input through operation of key top 21 of keyboard 18. With this subcarrier, infrared-ray LED4 is driven to attain the remote control such as the channel switching, the sound volume control and others. On the other hand, the button of switch 17 is released when board 19 is opened. And thus the subcarrier is generated for the 2nd frequeny which is modulated by the pulse produced in accordance with the indication input through operation of key top 21 of board 18. As a result, LED4 is driven to emit the remote control signal for the control of the tint, color, sound volume, etc. |
