BR9908174A - Method and circuit for demodulation of am - Google Patents

Method and circuit for demodulation of am

Info

Publication number
BR9908174A
BR9908174A BR9908174-1A BR9908174A BR9908174A BR 9908174 A BR9908174 A BR 9908174A BR 9908174 A BR9908174 A BR 9908174A BR 9908174 A BR9908174 A BR 9908174A
Authority
BR
Brazil
Prior art keywords
signal
fed
input
mixer
circuit
Prior art date
Application number
BR9908174-1A
Other languages
Portuguese (pt)
Inventor
Freddy Petersen
Arne Midtgaard
Heine Ewi Pedersen
Original Assignee
Tss Traffic Supervision System
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 Tss Traffic Supervision System filed Critical Tss Traffic Supervision System
Publication of BR9908174A publication Critical patent/BR9908174A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

Patente de Invenção: <B>''MéTODO E CIRCUITO PARA DEMODULAçãO DE AM''<D>. A invenção refere-se a um método para demodulação simultânea de AM de dados que são transferidos entre um transponder e um interrogador em relação com detecção de metal. O sinal de onda portadora é modulado em amplitude pelo sinal de informação e é alimentado a uma entrada de um receptor onde ele é ramificado em duas partes, de modo que a primeira parte é alimentada a um limitador severo, enquanto a segunda parte é alimentada a uma primeira entrada de um misturador, cuja segunda entrada recebe o sinal de saída do limitador severo. As duas partes de sinais são multiplicadas no misturador. Um sinal de CC usado para detecção de metal e um sinal de CA usado para determinação de um sinal de informação possível ocorre na saída do misturador. O sinal de AM é alimentado para o receptor de uma antena que contém um circuito ajustado, que recebe um sinal separado galvanicamente de um gerador. Sinais de objetos que contêm , parcialmente, uma etiqueta com dados de identificação e, parcialmente, não contêm uma etiqueta podem ser usados para detecção e identificação de objetos.Invention Patent: <B> '' METHOD AND CIRCUIT FOR DEMODULATING AM '' <D>. The invention relates to a method for simultaneous AM demodulation of data that is transferred between a transponder and an interrogator in connection with metal detection. The carrier wave signal is modulated in amplitude by the information signal and is fed to an input of a receiver where it is branched in two parts, so that the first part is fed to a severe limiter, while the second part is fed to a first input from a mixer, the second input of which receives the output signal from the severe limiter. The two parts of signals are multiplied in the mixer. A DC signal used for metal detection and an AC signal used for determining a possible information signal occurs at the mixer output. The AM signal is fed to the receiver of an antenna that contains an adjusted circuit, which receives a signal galvanically separated from a generator. Signals of objects that partially contain a label with identification data and partially do not contain a label can be used for object detection and identification.

BR9908174-1A 1998-02-23 1999-02-23 Method and circuit for demodulation of am BR9908174A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK24798A DK24798A (en) 1998-02-23 1998-02-23 Method for simultaneous AM demodulation of data and signals generated by interaction with metal
PCT/DK1999/000076 WO1999043132A2 (en) 1998-02-23 1999-02-23 A method and a circuit for am demodulation

Publications (1)

Publication Number Publication Date
BR9908174A true BR9908174A (en) 2000-10-31

Family

ID=8091396

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9908174-1A BR9908174A (en) 1998-02-23 1999-02-23 Method and circuit for demodulation of am

Country Status (8)

Country Link
EP (1) EP1050141A2 (en)
JP (1) JP2003527754A (en)
CN (1) CN1292189A (en)
AU (1) AU2412199A (en)
BR (1) BR9908174A (en)
CA (1) CA2320699A1 (en)
DK (1) DK24798A (en)
WO (1) WO1999043132A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4680093B2 (en) * 2006-02-27 2011-05-11 三菱電機株式会社 Electronic tag system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4147973A (en) * 1976-12-20 1979-04-03 Weber Harold J Frequency dependent amplitude modulated translator apparatus
SU1150596A1 (en) * 1983-10-27 1985-04-15 Всесоюзный Научно-Исследовательский Институт Геофизических Методов Разведки Geophone device
US5257403A (en) * 1989-07-20 1993-10-26 Scientific-Atlanta, Inc. Method of subcarrier multiplication which preserves AM Information in FM systems
DE4103234C2 (en) * 1991-02-02 1994-07-14 Beha C Gmbh Method and line finder for the contactless search and identification of electrical lines
WO1998007052A1 (en) * 1996-08-16 1998-02-19 Jon Neal Weaver Anti-shoplifting security system

Also Published As

Publication number Publication date
AU2412199A (en) 1999-09-06
DK24798A (en) 1998-03-03
WO1999043132A3 (en) 1999-10-28
CN1292189A (en) 2001-04-18
EP1050141A2 (en) 2000-11-08
CA2320699A1 (en) 1999-08-26
JP2003527754A (en) 2003-09-16
WO1999043132A2 (en) 1999-08-26

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Legal Events

Date Code Title Description
FA10 Dismissal: dismissal - article 33 of industrial property law
B11Y Definitive dismissal acc. article 33 of ipl - extension of time limit for request of examination expired