| 摘要 |
PURPOSE:To ensure an effective prevention for the malfunction of the remote control device by detecting the code pulse row of the received control signal and then eliminating the noise component mixing in the pause period between the code pulse rows during which the control signal is repeated. CONSTITUTION:The control signal sent from the transmission side via reception part 1 is converted into the electric signal and then applied to detector 3 after amplification through amplifier 2, and the digital code by the order information is demodulated by detector 3. Additional circuit 20 connected across resistor 4 which detects the pause period during the repetitive code pulse of the control signal is installed between detector 3 and decoder 5. Then the 1st and 2nd rectangular waves between the code pulses are generated at the output of transistor 11 by the functions of latch circuits 16 and 19, NAND gate 18 plus momostable multivibrators 17 and 10 which are installed to circuit 20. And in case the noise component is mixed into the 1st rectangular wave, the width of the 2nd rectangular wave is controlled to apply the noise component to decoder 5. Thus the noise component mixing to decoder 5 in the pause period can be eliminated effectively. |
