EP0065904B1 - Zustandsermittlungsverfahren eines alles oder nichts modulierten Wechselsignales in gestörter Umgebung - Google Patents

Zustandsermittlungsverfahren eines alles oder nichts modulierten Wechselsignales in gestörter Umgebung Download PDF

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Publication number
EP0065904B1
EP0065904B1 EP82400854A EP82400854A EP0065904B1 EP 0065904 B1 EP0065904 B1 EP 0065904B1 EP 82400854 A EP82400854 A EP 82400854A EP 82400854 A EP82400854 A EP 82400854A EP 0065904 B1 EP0065904 B1 EP 0065904B1
Authority
EP
European Patent Office
Prior art keywords
signal
useful
amplitude
alternating signal
modulated
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP82400854A
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English (en)
French (fr)
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EP0065904A1 (de
Inventor
Jean-François Gabillet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jeumont Schneider SA
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Jeumont Schneider SA
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Filing date
Publication date
Application filed by Jeumont Schneider SA filed Critical Jeumont Schneider SA
Publication of EP0065904A1 publication Critical patent/EP0065904A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
    • B61L3/16—Continuous control along the route
    • B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/24—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation employing different frequencies or coded pulse groups, e.g. in combination with track circuits
    • B61L3/243—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation employing different frequencies or coded pulse groups, e.g. in combination with track circuits using alternating current

Definitions

  • the present invention relates to a method for determining, on reception, the state of an alternating signal the amplitude of which is modulated in all or nothing circulating in a disturbed medium, as well as the reception and determination circuit for setting up work of this process.
  • the determination of the state of such a signal is obtained by comparison of the amplitude of the signal with a previously determined reference level.
  • the state of the signal is then given by the sign of a difference.
  • a disturbed environment there is a risk of falsely interpreting the state of the signal, for example during a permanent or temporary weakening of the signal, due to the environment in the band of the transmitted frequency. When such attenuations are random, it is not possible to determine an optimal reference level.
  • the object of the present invention is to obviate these drawbacks by using an environment-dependent reference in the same way as the signal whose state is to be determined.
  • the amplitude of the useful alternating signal is compared at all times with that of at least one non-reference signal.
  • the value of the difference in amplitudes of these signals, on reception, then makes it possible, with respect to a previously fixed value, to determine with certainty the state of the useful signal.
  • the useful AC signal whose state is to be determined is framed by two permanently transmitted signals having frequencies respectively slightly higher and slightly lower than that of the useful signal.
  • Such a method can in particular be implemented in a system for punctual transmission of information in the railway field including fixed track contacts otherwise called "crocodiles".
  • Such a system is generally constituted by a device on board the train and comprising, on the one hand, a transmitter which permanently transmits on two conducting wires, a plurality of signals of different frequencies, and on the other hand, a detector of these signals connected to the two conducting wires.
  • One of these two wires is connected to a rail line by means of at least one train wheel, while the other wire is connected to a friction shoe.
  • each crocodile is connected to the rail file by the intermediary of a resonant circuit, in such a way that the latter circuit shunts the detector when the wiper comes into contact with the crocodile. Therefore, the detector, during the passage of the train at the crocodile level, no longer detects the signal whose frequency corresponds to that of the resonant circuit.
  • the reception and determination circuit for implementing the method is connected to the two conductive wires on board the train. It includes, when the useful signal whose state is to be determined is framed by two signals continuously transmitted and having frequencies respectively slightly higher and slightly lower than that of the useful signal, three selective filters arranged in parallel respectively tuned on the three frequencies used, at the output of which are connected two operational amplifiers respectively by the intermediary of a diode so as to effect the difference of the amplitude of each of the reference signals from that of the useful signal, and the outputs of which are at their tower, connected to the inputs of two comparators to the other inputs to which a constant voltage is applied determining a difference threshold, and an AND gate whose inputs are respectively connected to the output terminals of the two comparators, and whose state of the terminal output is representative of the state of the wanted signal.
  • the single figure schematically represents an embodiment of the circuit for implementing the method according to the invention.
  • the method for determining the state of a useful alternating signal modulated in all or nothing in disturbed medium is based on the use of a reference in the same disturbed medium, that is to say dependent of the environment in the same way as the useful alternating signal as for its amplitude.
  • This reference is obtained by means of at least one alternating reference signal continuously transmitted, having a frequency close to that of the useful signal and the same amplitude on transmission.
  • two alternating signals are used having frequencies respectively slightly higher and slightly lower than that of the useful signal.
  • the amplitude of the useful signal is compared to that of the signal or of the reference signals, since these signals will simultaneously undergo the same attenuations in disturbed medium, their frequencies being very close.
  • An embodiment of a reception circuit tion and determination using this method is shown schematically in the single figure in the case of a useful signal framed by two reference signals.
  • the signals are sent on line 1 which crosses a disturbed environment.
  • Three selective filters 2, 3, 4 are arranged in parallel so as to ensure the separation of the signals.
  • the bandpass filters 2 and 4 are intended to isolate the reference signals framing the useful signal isolated by the bandpass filter 3.
  • the output terminals of these filters are connected to the input terminals of two operational amplifiers 5, 6 by means of full-wave rectifiers symbolized schematically by the diodes 7, 8, 9 in the figure.
  • Filters 2 and 4 corresponding to the reference signals are respectively connected to the positive (non-inverting) terminal of amplifiers 5, 6, while filter 3 is connected to the negative (inverting) terminal of these two amplifiers. Therefore, there is at the output of these two amplifiers a signal proportional to the difference of the amplitudes of one of the reference signals and the useful signal.
  • each of the comparators 10, 11 is connected to one of the two inputs of an AND gate 13 at the output 14 from which there is a signal representative of the state of the useful signal.
  • the comparators 10 and 11 only deliver a signal on their output terminals if the amplitude of the signal representative of the difference from the amplifiers 5 and 6 is greater than the determined threshold, and the AND gate does not deliver a signal at its output 14 only if the two comparators 10, 11 simultaneously deliver a signal.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Claims (3)

1. Verfahren der beim Empfang und in gestörter Umgebung erfolgenden Bestimmung des Zustandes eines Nutz-Wechselsignals, dessen Amplitude digital moduliert ist, dadurch gekennzeichnet,.daß die Amplitude des genannten Nutz-Wechselsignals jederzeit von der wenigstens eines nicht modulierten Referenzsignals subtrahiert wird, welches dauernd mit derselben Amplitude und einer benachbarten Frequenz ausgesendet wird und derselben gestörten Umgebung ausgesetzt ist, und daß der Wert des Differenzsignales mit einem zuvor festgelegten Wert verglichen wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Bezugsgröße zwei nicht modulierte Signale verwendet werden, die dauernd mit derselben Amplitude wie die des Nutzsignals und mit Frequenzen ausgesendet werden, von denen die eine etwas größer und die andere etwas kleiner als die des Nutzsignales ist, und welche derselben gestörten Umgebung ausgesetzt sind.
3. Empfangs- und Bestimmungsschaltung zur Durchführung des Verfahrens nach Anspruch 2, dadurch gekennzeichnet, daß sie umfaßt : drei selektive Bandpaßfilter (2, 3, 4) von denen jedes auf eine der drei verwendeten Frequenzen abgestimmt ist ; zwei Operationsverstärker (5, 6) ; zwei Komparatoren (10, 11) und eine AND-Torschaltung (13) ; wobei die genannten Filter (2, 3, 4) an ihren Eingängen parallel geschaltet und an ihren Ausgängen mit den Eingängen der genannten Operationsverstärker (5, 6) über gleichrichter (7, 8, 9) verbunden sind ; wobei die Ausgänge der Filter (2, 4), die den Referenzsignalen entsprechen, jeweils mit dem nicht investierenden Anschluß des entsprechenden Operationsverstärkers (5, 6) verbunden sind, während der Ausgangsanschluß des Filters (3), welches dem Nutz-Wechselsignal entspricht, an die invertierenden Anschlüsse der genannten Verstärker (5, 6) angeschlossen ist, deren Ausgangsanschluß jeweils mit einem der Eingangsanschlüsse eines Komparators (10, 11) verbunden ist, dessen anderer Eingangsanschluß mit einer Gleichspannungsquelle (12) von zuvor festgelegtem Spannungswert verbunden ist, während der Ausgangsanschluß mit einem der zwei Eingangsanschlüsse der genannten AND-Torschaltung (13) verbunden ist, an deren Ausgang (14) das Signal abgenommen wird, welches der Zustand des genannten Nutz-Wechselsignales darstellt.
EP82400854A 1981-05-19 1982-05-10 Zustandsermittlungsverfahren eines alles oder nichts modulierten Wechselsignales in gestörter Umgebung Expired EP0065904B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8109919 1981-05-19
FR8109919A FR2506544A1 (fr) 1981-05-19 1981-05-19 Procede de determination de l'etat d'un signal alternatif module en tout ou rien en milieu perturbe

Publications (2)

Publication Number Publication Date
EP0065904A1 EP0065904A1 (de) 1982-12-01
EP0065904B1 true EP0065904B1 (de) 1985-08-07

Family

ID=9258620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400854A Expired EP0065904B1 (de) 1981-05-19 1982-05-10 Zustandsermittlungsverfahren eines alles oder nichts modulierten Wechselsignales in gestörter Umgebung

Country Status (8)

Country Link
US (1) US4555791A (de)
EP (1) EP0065904B1 (de)
AU (1) AU553426B2 (de)
BR (1) BR8202530A (de)
CA (1) CA1189917A (de)
DE (1) DE3265208D1 (de)
FR (1) FR2506544A1 (de)
ZA (1) ZA823474B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214920A1 (de) * 1992-05-11 1993-11-18 Thomson Brandt Gmbh Verfahren und Vorrichtung zur Sensorsignal-Aufbereitung
CN101036178A (zh) * 2004-10-04 2007-09-12 皇家飞利浦电子股份有限公司 矩阵显示装置的发光单元的亮度控制
BE1019445A3 (fr) * 2010-08-11 2012-07-03 Reza Yves Procede d'extraction d'information audio.

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1752325A (en) * 1928-11-15 1930-04-01 American Telephone & Telegraph Reduction of static interference in carrier systems
DE540850C (de) * 1930-01-03 1934-01-05 Telefunken Gmbh Verfahren zur gleichzeitigen UEbermittlung von Buchstaben- und Bildtelegraphie auf dem gleichen drahtlosen Verbindungswege
US2070418A (en) * 1933-05-19 1937-02-09 Rca Corp Multiplex cable code telegraphy with diversity reception
BE458361A (de) * 1945-03-15
US2602852A (en) * 1947-05-23 1952-07-08 Motorola Inc Selective calling system
BE486300A (de) * 1947-07-09
US3413608A (en) * 1964-06-12 1968-11-26 Warwick Electronics Inc Noise immune detector
US3571522A (en) * 1968-11-29 1971-03-16 Bell Telephone Labor Inc Tone detector
DE2444251A1 (de) * 1974-09-16 1976-03-25 Siemens Ag Gleisstromkreis, insbesondere fuer gleichstrombahnen mit chopper-gesteuerten triebfahrzeugen
FR2302640A1 (fr) * 1975-02-25 1976-09-24 Thomson Csf Systeme de transmission d'informations utilisant une modulation par deplacement de frequence

Also Published As

Publication number Publication date
DE3265208D1 (en) 1985-09-12
FR2506544A1 (fr) 1982-11-26
AU8353582A (en) 1982-11-25
AU553426B2 (en) 1986-07-17
FR2506544B1 (de) 1983-10-28
US4555791A (en) 1985-11-26
EP0065904A1 (de) 1982-12-01
BR8202530A (pt) 1983-04-19
CA1189917A (fr) 1985-07-02
ZA823474B (en) 1983-03-30

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