WO1999043132A3 - A method and a circuit for am demodulation - Google Patents
A method and a circuit for am demodulation Download PDFInfo
- Publication number
- WO1999043132A3 WO1999043132A3 PCT/DK1999/000076 DK9900076W WO9943132A3 WO 1999043132 A3 WO1999043132 A3 WO 1999043132A3 DK 9900076 W DK9900076 W DK 9900076W WO 9943132 A3 WO9943132 A3 WO 9943132A3
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- fed
- mixer
- input
- document
- 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.)
- Ceased
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
Definitions
- IPC6 H04L 27/06, G01V 3/10
- IPC6 G01V, H04L, H03D
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
- Near-Field Transmission Systems (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention relates to a method for simultaneous AM demodulation of data which are transferred between a transponder and an interrogator in connection with metal detection. The carrier wave signal is amplitude modulated by the information signal and is fed to an input of a receiver where it is branched into two parts, so that the first part is fed to a severe limiter, while the second part is fed to a first input of a mixer whose second input receives the output signal from the severe limiter. The two signal parts are multiplied in the mixer. A DC signal used for metal detection and an AC signal used for determining a possible information signal occur on the output of the mixer. The AM signal is fed to the receiver from an antenna which contains an adjusted circuit, which receives a signal galvanically separated from a generator. Signals from objects which partly contain a tag with identification data and partly do not contain a tag, may be used for detection and identification of objects.
Description
INTERNATIONAL SEARCH REPORT International application No.
PCT/DK 99/00076
A. CLASSIFICATION OF SUBJECT MAΪTΕR
IPC6: H04L 27/06, G01V 3/10
According lo International Patent Classification (I PC) or lo both national classification and IPC
B. FIELDS SEARCHED
Minimum documentation searched (classification system followed by classification symbols)
IPC6: G01V, H04L, H03D
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched
SE,DK,FI ,N0 classes as above
Electronic data base consulted duπng the international search (name of data base and, where practicable, search terms used)
C. DOCUMENTS CONSIDERED I O BE RELLVAN I
Categoiy" Citation of document, with indication, wlici e appi opπate, of the t elevant passages Relevant to claim No.
WO 9807052 Al (WEAVER , JON NEAL) , 19 February 1998 1-6 (19.02.98) , page 2 , l ine 30 - page 4, l ine 5
Derwent' s abstract, No SU-115059/06, week SU06, 1-6 ABSTRACT OF SU, 1150596 (GEOPHYS PROSPECTING) , 15 Apri l 1985 (15.04.85)
US 4147973 A (HAROLD J. WEBER) , 3 Apri l 1979 1-6 (03.04.79) , column 1 , l ine 6 - l ine 67
US 5418447 A (CHRISTIAN BEHA ET AL) , 23 May 1995 1-6 (23.05.95) , abstract
Further documents are listed in the continuation of Box C. y\ See patent family annex.
* Special categories of cited documents: ' T" later document published afler the internaUonal filing date or pπoπty
"A" document defining the general state of the art which is not considered date and not in conflict with the application but cited to understand to be of particular relevance the pπnciple or theory underlying the invention "E" er er document but published on or after the international filing dale 'X" document of particular relevance: the claimed invention cannot be
"L" document which may throw doubts on pπoπty claιm(s) or which is considered novel or cannot be considered to involve an inventive cited to establish the publication date of another citation or olher step when the document is taken alone special reason (as specified) "Y" document of particular relevance: the claimed invention cannot be
"O" document referring to an oral disclosure, use, exhibition or other considered to involve an inventive step when the document is means combined with one or more other such documents, such combination "P" document published pπor to the international filing date but lalcr than being ohvious to a person skilled in the art the pπonty date claimed "&" document member of the same patent family
Date of the actual completion of the international seai ch Date of mailing of the international seai c repoit
11 August 1999 3 0 -08- 1999
Name and mailing address of the ISA/ Authoiized officer
Swedish Patent Office
Box 5055, S-102 42 STOCKHOLM Peder Gjervaldsaeter/MN
Facsimile No. + 46 8 666 02 86 Telephone No. + 46 8 782 25 00
INTERNATIONAL SEARCH REPORT International application No.
PCT/DK 99/00076
C (Continuation). DOCUMEN TS CONSIDERIiD TO BE RELEVANT
Category* Citation of document, with indication, where appropriate, of fhe relevant passages Relevant to claim No.
US 5257403 A (LUIS A. ROVIRA ET AL) , 3-5
26 October 1993 (26.10.93), column 3, line 46 - column 4, line 3; column 4, line 55 - column 5, line 19, figure 3
Form PCT/ISA/210 (continuation of second sheet) (July 1992)
INTERNATIONAL SEARCH REPORT International application No.
Information on patent family members
01/07/99 PCT/DK 99/00076
Patent document Publication Patent family Publication cited in search report date member(s) date
WO 9807052 Al 19/02/98 AU 4070697 A 06/03/98 EP 0919002 A 02/06/99 US 5703566 A 30/12/97 US 5900816 A 04/05/99
US 4147973 A 03/04/79 NONE US 5418447 A 23/05/95 DE 4103234 A,C 13/08/92 US 5257403 A 26/10/93 AT 114918 T 15/12/94
AU 636636 B 06/05/93
AU 6050590 A 22/02/91
CA 2021481 A 21/01/91
CN 1049584 A 27/02/91
DE 69014634 D,T 04/05/95
DK 483234 T 24/04/95
EP 0483234 A,B 06/05/92
SE 0483234 T3
ES 2064746 T 01/02/95
JP 4506891 T 26/11/92
WO 9101611 A 07/02/91
Form PCT/ISA/210 (patent family annex) (July 1992)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002320699A CA2320699A1 (en) | 1998-02-23 | 1999-02-23 | A method and a circuit for am demodulation |
| BR9908174-1A BR9908174A (en) | 1998-02-23 | 1999-02-23 | Method and circuit for demodulation of am |
| EP99903597A EP1050141A2 (en) | 1998-02-23 | 1999-02-23 | A method and a circuit for am demodulation |
| JP2000532954A JP2003527754A (en) | 1998-02-23 | 1999-02-23 | Method and circuit for AM demodulation |
| AU24121/99A AU2412199A (en) | 1998-02-23 | 1999-02-23 | A method and a circuit for am demodulation |
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 |
| DK0247/98 | 1998-02-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1999043132A2 WO1999043132A2 (en) | 1999-08-26 |
| WO1999043132A3 true WO1999043132A3 (en) | 1999-10-28 |
Family
ID=8091396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DK1999/000076 Ceased WO1999043132A2 (en) | 1998-02-23 | 1999-02-23 | A method and a circuit for am demodulation |
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)
| 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 |
Citations (5)
| 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 |
| US5418447A (en) * | 1991-02-02 | 1995-05-23 | Ch. Beha Gmbh | Process and apparatus for electromagnetically locating and identifying electrical lines using a high frequency carrier wave |
| WO1998007052A1 (en) * | 1996-08-16 | 1998-02-19 | Jon Neal Weaver | Anti-shoplifting security system |
-
1998
- 1998-02-23 DK DK24798A patent/DK24798A/en not_active Application Discontinuation
-
1999
- 1999-02-23 EP EP99903597A patent/EP1050141A2/en not_active Withdrawn
- 1999-02-23 JP JP2000532954A patent/JP2003527754A/en not_active Withdrawn
- 1999-02-23 BR BR9908174-1A patent/BR9908174A/en not_active Application Discontinuation
- 1999-02-23 CN CN 99803259 patent/CN1292189A/en active Pending
- 1999-02-23 AU AU24121/99A patent/AU2412199A/en not_active Abandoned
- 1999-02-23 WO PCT/DK1999/000076 patent/WO1999043132A2/en not_active Ceased
- 1999-02-23 CA CA002320699A patent/CA2320699A1/en not_active Abandoned
Patent Citations (5)
| 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 |
| US5418447A (en) * | 1991-02-02 | 1995-05-23 | Ch. Beha Gmbh | Process and apparatus for electromagnetically locating and identifying electrical lines using a high frequency carrier wave |
| WO1998007052A1 (en) * | 1996-08-16 | 1998-02-19 | Jon Neal Weaver | Anti-shoplifting security system |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Derwent World Patents Index; Class S03, AN 1985-262296/42 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1292189A (en) | 2001-04-18 |
| JP2003527754A (en) | 2003-09-16 |
| WO1999043132A2 (en) | 1999-08-26 |
| AU2412199A (en) | 1999-09-06 |
| DK24798A (en) | 1998-03-03 |
| BR9908174A (en) | 2000-10-31 |
| CA2320699A1 (en) | 1999-08-26 |
| EP1050141A2 (en) | 2000-11-08 |
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