EP 1050141 A2 20001108 - A METHOD AND A CIRCUIT FOR AM DEMODULATION
Title (en)
A METHOD AND A CIRCUIT FOR AM DEMODULATION
Title (de)
VERFAHREN UND SCHALTUNG ZUM DEMODULIEREN VON AM-SIGNALEN
Title (fr)
PROCEDE ET CIRCUIT DE DEMODULATION AM
Publication
Application
Priority
- DK 9900076 W 19990223
- DK 24798 A 19980223
Abstract (en)
[origin: WO9943132A2] 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.
IPC 1-7
IPC 8 full level
H03D 1/00 (2006.01); H04B 1/59 (2006.01); H04L 27/06 (2006.01)
CPC (source: EP)
H04L 27/06 (2013.01)
Citation (search report)
See references of WO 9943132A2
Designated contracting state (EPC)
DE DK FR GB IT
DOCDB simple family (publication)
WO 9943132 A2 19990826; WO 9943132 A3 19991028; AU 2412199 A 19990906; BR 9908174 A 20001031; CA 2320699 A1 19990826; CN 1292189 A 20010418; DK 24798 A 19980303; EP 1050141 A2 20001108; JP 2003527754 A 20030916
DOCDB simple family (application)
DK 9900076 W 19990223; AU 2412199 A 19990223; BR 9908174 A 19990223; CA 2320699 A 19990223; CN 99803259 A 19990223; DK 24798 A 19980223; EP 99903597 A 19990223; JP 2000532954 A 19990223