| 摘要 |
<p>PURPOSE:To facilitate the collation of the speed of a train and to enhance the fail-safety by constructing to apply a frequency signal multiplied by a frequency multiplier to a speed checker to check the speed. CONSTITUTION:A frequency signal of a speed command signal applied from an envelope detector 4 is converted by a frequency multiplier 8 to a frequency signal proportional to the allowable speed of a train to be meant, discriminated at a level by a level detector 10 through a variable filter 9, and outputted as the output of a receiver to a speed checker 6. Since a speed detection signal from a speed detector 7 of another input of the checker 6 is inputted as a frequency signal proportional to the speed of a train, the checker 6 eventually checks the frequency signal proportional to the allowable speed of the train from a train control receiver similarly as the frequency signal proportional to the speed of the train, thereby very facilitating the check of the speed in the checker 6. Further, the fail-safety can be enhanced.</p> |
