EP 0900485 A1 19990310 - AN ELECTRONIC CIRCUIT FOR RECEIVING AND DISCRIMINATING MODULATED LIGHT AND AN ELECTRONIC PRICE DISPLAY COMPRISING SAID CIRCUIT
Title (en)
AN ELECTRONIC CIRCUIT FOR RECEIVING AND DISCRIMINATING MODULATED LIGHT AND AN ELECTRONIC PRICE DISPLAY COMPRISING SAID CIRCUIT
Title (de)
ELEKTRONISCHE SCHALTUNG ZUM EMPFANG UND ZUR ENTSCHEIDUNG VON MODULIERTEM LICHT UND ELEKTRONISCHE PREISANZEIGE DAMIT AUSGERÜSTETE
Title (fr)
CIRCUIT ELECTRONIQUE DESTINE A RECEVOIR ET A DISTINGUER UNE LUMIERE MODULEE, ET AFFICHAGE ELECTRONIQUE DE PRIX COMPRENANT CE CIRCUIT
Publication
Application
Priority
- DK 9700189 W 19970424
- DK 51296 A 19960429
Abstract (en)
[origin: WO9741651A1] An electronic circuit (50) for receiving and discriminating modulated light of a specific modulation frequency or within a specific modulation frequency range, comprises a photodiode detector (52) responsive to light incident thereto for generating an electric current signal. The electronic circuit further comprises a controllable shunt (54) connected in parallel with the photodiode detector (52) and controllable between a first operational mode in which the electric current is shunted and a second operational mode in which the electric current is not shunted, and a control circuit (56) connected to the photodiode detector (52) and the controllable shunt (54) for controlling the controllable shunt (54) into the first operational mode provided the electric current signal does not include a signal of the specific modulation frequency or within the specific modulation frequency range, or for controlling the controllable shunt (54) into the second operational mode provided the electric current signal includes a signal of the specific modulation frequency or within the specific modulation frequency range.
IPC 1-7
IPC 8 full level
G06F 3/147 (2006.01); H04B 10/69 (2013.01)
CPC (source: EP)
G06F 3/147 (2013.01); H04B 10/6911 (2013.01); G09G 2380/04 (2013.01)
Citation (search report)
See references of WO 9741651A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9741651 A1 19971106; AU 2692697 A 19971119; EP 0900485 A1 19990310
DOCDB simple family (application)
DK 9700189 W 19970424; AU 2692697 A 19970424; EP 97920602 A 19970424