TR24261A - FREQUENCY ADJUSTABLE (FM) LINE CIRCUIT - Google Patents

FREQUENCY ADJUSTABLE (FM) LINE CIRCUIT

Info

Publication number
TR24261A
TR24261A TR88/0199A TR19988A TR24261A TR 24261 A TR24261 A TR 24261A TR 88/0199 A TR88/0199 A TR 88/0199A TR 19988 A TR19988 A TR 19988A TR 24261 A TR24261 A TR 24261A
Authority
TR
Turkey
Prior art keywords
frequency
track circuit
receiver
track
bandwidth
Prior art date
Application number
TR88/0199A
Other languages
Turkish (tr)
Original Assignee
Standard Elektrik Lorenz Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz Ag filed Critical Standard Elektrik Lorenz Ag
Publication of TR24261A publication Critical patent/TR24261A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/18—Railway track circuits
    • B61L1/181—Details
    • B61L1/188—Use of coded current

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Circuits Of Receivers In General (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Superheterodyne Receivers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Amplifiers (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Amplitude Modulation (AREA)
  • Details Of Television Scanning (AREA)
  • Transmitters (AREA)

Abstract

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>
TR88/0199A 1987-03-18 1988-03-16 FREQUENCY ADJUSTABLE (FM) LINE CIRCUIT TR24261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873708788 DE3708788A1 (en) 1987-03-18 1987-03-18 FREQUENCY MODULATED TRACK CIRCUIT

Publications (1)

Publication Number Publication Date
TR24261A true TR24261A (en) 1991-07-29

Family

ID=6323367

Family Applications (1)

Application Number Title Priority Date Filing Date
TR88/0199A TR24261A (en) 1987-03-18 1988-03-16 FREQUENCY ADJUSTABLE (FM) LINE CIRCUIT

Country Status (6)

Country Link
EP (1) EP0282932B1 (en)
AT (1) ATE140194T1 (en)
DE (2) DE3708788A1 (en)
ES (1) ES2091745T3 (en)
TR (1) TR24261A (en)
YU (1) YU53188A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19816581A1 (en) * 1998-04-08 1999-10-21 Siemens Ag Train control device
DE102007030598A1 (en) * 2007-06-28 2009-01-15 Siemens Ag Method and device for evaluating an INDUSI signal
DE102009010906A1 (en) 2009-03-02 2010-09-16 Siemens Aktiengesellschaft Devices for detecting the occupancy or free state of a track section and method for operating such devices

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715669A (en) * 1970-08-13 1973-02-06 Gen Signal Corp Receiver for a frequency modulated overlay track circuit
AT311413B (en) * 1971-01-05 1973-11-12 Itt Austria Track monitoring device for railway systems
US4417229A (en) * 1980-10-15 1983-11-22 Safetran Systems Corporation Means for use on a railroad to distinguish between traction current and signal current
DE3325249C2 (en) * 1983-07-13 1987-01-15 Standard Elektrik Lorenz Ag, 7000 Stuttgart Track circuit receiver
DE3403946A1 (en) * 1984-02-04 1985-08-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Presence-of-trains indicating device with track current coding

Also Published As

Publication number Publication date
ES2091745T3 (en) 1996-11-16
EP0282932A2 (en) 1988-09-21
EP0282932A3 (en) 1989-12-06
EP0282932B1 (en) 1996-07-10
DE3708788A1 (en) 1988-09-29
DE3855407D1 (en) 1996-08-14
YU53188A (en) 1990-12-31
ATE140194T1 (en) 1996-07-15

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