ZA811786B - Stage for selection of the alternative signal of greater amplitude between two signals of different frequencies - Google Patents

Stage for selection of the alternative signal of greater amplitude between two signals of different frequencies

Info

Publication number
ZA811786B
ZA811786B ZA00811786A ZA811786A ZA811786B ZA 811786 B ZA811786 B ZA 811786B ZA 00811786 A ZA00811786 A ZA 00811786A ZA 811786 A ZA811786 A ZA 811786A ZA 811786 B ZA811786 B ZA 811786B
Authority
ZA
South Africa
Prior art keywords
selection
stage
signals
different frequencies
greater amplitude
Prior art date
Application number
ZA00811786A
Other languages
English (en)
Inventor
J Salmon
D Laurent
Original Assignee
Jeumont Schneider
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 Jeumont Schneider filed Critical Jeumont Schneider
Publication of ZA811786B publication Critical patent/ZA811786B/xx

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing phase or frequency of 2 mutually independent oscillations in demodulators)
    • 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 vehicle train, e.g. to release brake, 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
    • H04L27/1563—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using transition or level detection
ZA00811786A 1980-03-18 1981-03-18 Stage for selection of the alternative signal of greater amplitude between two signals of different frequencies ZA811786B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8005981A FR2478901B1 (fr) 1980-03-18 1980-03-18 Etage de selection du signal alternatif de plus grande amplitude parmi deux signaux de frequences differentes

Publications (1)

Publication Number Publication Date
ZA811786B true ZA811786B (en) 1982-04-28

Family

ID=9239775

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00811786A ZA811786B (en) 1980-03-18 1981-03-18 Stage for selection of the alternative signal of greater amplitude between two signals of different frequencies

Country Status (12)

Country Link
US (1) US4488238A (it)
AU (1) AU544840B2 (it)
BE (1) BE887913A (it)
BR (1) BR8107468A (it)
CA (1) CA1166707A (it)
DE (1) DE3140626C1 (it)
FR (1) FR2478901B1 (it)
GB (1) GB2083980B (it)
IT (1) IT1170809B (it)
NL (1) NL8120059A (it)
WO (1) WO1981002714A1 (it)
ZA (1) ZA811786B (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625279A (en) * 1984-05-11 1986-11-25 Westinghouse Electric Corp. Vehicle speed control apparatus and method
FR2736225B1 (fr) * 1995-06-27 1997-08-01 Gec Alsthom Transport Sa Dispositif permettant de s'affranchir des problemes de diaphonie lors de la localisation d'un vehicule se deplacant le long de moyens de propagation d'ondes electromagnetiques
US7027897B2 (en) * 2004-01-27 2006-04-11 Bombardier Transportation Gmbh Apparatus and method for suppressing mechanical resonance in a mass transit vehicle

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251391B (it) * 1962-10-01
GB1151614A (en) * 1967-02-22 1969-05-14 Gen Electric & English Elect Improvements in or relating to Electric Signal Receivers
GB1164386A (en) * 1967-05-26 1969-09-17 Standard Telephones Cables Ltd Frequency Separation.
FR2076219A5 (it) * 1970-01-07 1971-10-15 Signaux Entr Electriques
US3760278A (en) * 1970-12-23 1973-09-18 Thomson Csf Limited range radiocommunication system
FR2313812A2 (fr) * 1972-03-17 1976-12-31 Jeumont Schneider Selecteur a securite intrinseque pour signaux a frequence de recurrence
FR2176266A5 (it) * 1972-03-17 1973-10-26 Jeumont Schneider
BE799885R (fr) * 1972-05-26 1973-09-17 Thomson Csf Perfectionnements aux dispositifs d'intercommunication a rayonnement limite,
US3973746A (en) * 1975-05-02 1976-08-10 Walt Disney Productions Collision avoidance system

Also Published As

Publication number Publication date
NL8120059A (en) 1982-02-01
DE3140626C1 (de) 1984-03-08
GB2083980A (en) 1982-03-31
US4488238A (en) 1984-12-11
IT1170809B (it) 1987-06-03
BR8107468A (pt) 1982-02-09
FR2478901A1 (fr) 1981-09-25
CA1166707A (fr) 1984-05-01
BE887913A (fr) 1981-07-01
IT8148032A1 (it) 1982-09-16
AU6786981A (en) 1981-10-09
WO1981002714A1 (fr) 1981-10-01
IT8148032A0 (it) 1981-03-16
FR2478901B1 (fr) 1986-02-07
GB2083980B (en) 1984-06-06
AU544840B2 (en) 1985-06-13

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