| 摘要 |
<p>A system, transmitter and receiver for the supervision and control of a railbound vehicle where a transmitter feeds a low frequency, pulse modulated signal current into the rails corresponding to certain allowed speed limits for the vehicle. A phase generating device (11) transmits signals having a phase shift of zero and/or where at least a portion of the signal contains phase shift. The phase shift may, e.g., be 180°.</p> |
