EP 0282932 B1 19960710 - Frequency-modulated track current circuit
Title (en)
Frequency-modulated track current circuit
Title (de)
Frequenzmodulierter Gleisstromkreis
Title (fr)
Circuit de voie modulé en fréquence
Publication
Application
Priority
DE 3708788 A 19870318
Abstract (en)
[origin: EP0282932A2] A circuit is described in which the bandwidth of the track circuit receiver (8) is design to be so narrow that it is virtually impossible for it to be subjected to interference. To permit interpretation of the frequency-modulated track voltage, the frequency deviation of which far exceeds the bandwidth of the receiver, the narrow band characteristic is achieved by means of an adjustable bandpass filter (7), the centre frequency of which is controlled so that it precisely follows the frequency of the track circuit transmitter (2). For this purpose, the output signal from the track circuit transmitter is fed to the track circuit receiver via a special lead (9). <IMAGE>
IPC 1-7
IPC 8 full level
B61L 1/18 (2006.01)
CPC (source: EP)
B61L 1/188 (2013.01)
Designated contracting state (EPC)
AT CH DE ES LI LU
DOCDB simple family (publication)
EP 0282932 A2 19880921; EP 0282932 A3 19891206; EP 0282932 B1 19960710; AT E140194 T1 19960715; DE 3708788 A1 19880929; DE 3855407 D1 19960814; ES 2091745 T3 19961116; TR 24261 A 19910729; YU 53188 A 19901231
DOCDB simple family (application)
EP 88103941 A 19880312; AT 88103941 T 19880312; DE 3708788 A 19870318; DE 3855407 T 19880312; ES 88103941 T 19880312; TR 19988 A 19880316; YU 53188 A 19880316