EP0065904B1 - Zustandsermittlungsverfahren eines alles oder nichts modulierten Wechselsignales in gestörter Umgebung - Google Patents
Zustandsermittlungsverfahren eines alles oder nichts modulierten Wechselsignales in gestörter Umgebung Download PDFInfo
- 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
Links
- 238000000034 method Methods 0.000 title claims description 13
- 241000270722 Crocodylidae Species 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- LNNWVNGFPYWNQE-GMIGKAJZSA-N desomorphine Chemical compound C1C2=CC=C(O)C3=C2[C@]24CCN(C)[C@H]1[C@@H]2CCC[C@@H]4O3 LNNWVNGFPYWNQE-GMIGKAJZSA-N 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- 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.
Landscapes
- 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)
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)
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 |
US20070257873A1 (en) * | 2004-10-04 | 2007-11-08 | Koninklijke Philips Electronics, N.V. | Brightness control of a lighting unit of a matrix display device |
BE1019445A3 (fr) * | 2010-08-11 | 2012-07-03 | Reza Yves | Procede d'extraction d'information audio. |
Family Cites Families (10)
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 |
BE501695A (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 |
-
1981
- 1981-05-19 FR FR8109919A patent/FR2506544A1/fr active Granted
-
1982
- 1982-04-30 CA CA000402024A patent/CA1189917A/fr not_active Expired
- 1982-05-03 BR BR8202530A patent/BR8202530A/pt unknown
- 1982-05-10 AU AU83535/82A patent/AU553426B2/en not_active Ceased
- 1982-05-10 EP EP82400854A patent/EP0065904B1/de not_active Expired
- 1982-05-10 DE DE8282400854T patent/DE3265208D1/de not_active Expired
- 1982-05-13 US US06/377,803 patent/US4555791A/en not_active Expired - Fee Related
- 1982-05-19 ZA ZA823474A patent/ZA823474B/xx unknown
Also Published As
Publication number | Publication date |
---|---|
ZA823474B (en) | 1983-03-30 |
AU553426B2 (en) | 1986-07-17 |
US4555791A (en) | 1985-11-26 |
CA1189917A (fr) | 1985-07-02 |
EP0065904A1 (de) | 1982-12-01 |
FR2506544A1 (fr) | 1982-11-26 |
FR2506544B1 (de) | 1983-10-28 |
AU8353582A (en) | 1982-11-25 |
DE3265208D1 (en) | 1985-09-12 |
BR8202530A (pt) | 1983-04-19 |
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