| 摘要 |
<p>PURPOSE:To provide a train security device integrated in an electric circuit manner and structure capable of commonly using in ATS section and ATC section by forming an ATS signal receiver of a digital circuit. CONSTITUTION:A speed signal from a tachometer generator 1 is applied through a waveform shaper 20 and a variable frequency divider 21 to a speed counter 23. When the oscillation frequency oscillated between a train element 6 and a feedback amplifier 49 varies due to electromagnetic coupling with a ground element, a set command is outputted from a band pass filter 50. A modulated signal wave is sorted through a waveform shaper 55 by a frequency counter 56 at this time, is detected by a detector 58 and is held in a modulation holding circuit 57. A pattern speed is outputted from a memory circuit by the detected signal in this manner. A comparator 24 compares both speed signals to produce a brake command.</p> |
