| 摘要 |
The invention relates to a device for extracting the pulse signal from among parasitic signals in a receiver of a pulsed railway line circuit. According to the invention, it comprises first and second inductive sensors arranged in proximity to a length of rail and a third inductive sensor arranged in proximity to the other length of rail, the first sensor 9 being linked, on the one hand, to a first input of a first comparator 11 at the output of which the extracted pulse signal is picked off and, on the other hand, to a first input of a second comparator 12 by means of a rectifier circuit 14, while the second and third sensors 10, connected in series, are linked, on the one hand to the first input of an analog multiplier-divider circuit 16 and, on the other hand, to the first input of a third comparator 13 whose second input is connected to the output of the analog multiplier-divider circuit 16 and whose output terminal is linked, on the one hand, by means of a rectifier circuit 15, to the second input of the second comparator 12 whose output terminal is linked to the second input of the analog multiplier-divider circuit 16 and, on the other hand, to the second input of the first comparator 11 by means of a divider circuit 17. <IMAGE>
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