| 摘要 |
PURPOSE:To prevent the titled system from malfunction due to optical noise by reproducing a transmitted reader pulse signal based on dummy pulses added to positions preceding from the reader pulse signal for a remote control signal. CONSTITUTION:The dummy pulse signals DM1, DM2 are added to the positions preceding from the reader pulse signal LP and the signals DM1, DM2, the signal LP and a data pulse signal DP are modulated by carriers and the modulated signals are sent from a transmitter. When an optical noise LN is inputted, a switching transistor for detection is turned off by the discharge characteristics of a detecting circuit at the rapid reduction of the amplitude of the noise LN and no output is generated during the period if the amplitudes of the signals DM1, DM2 and LP are set up sufficiently larger than that of the noise LN. Since the signal LP is reproduced with the prescribed pulse width T, the signal is decided as a remote control signal and prescribed control based upon the signal DP can be executed. |
