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1. WO1997026633 - MOBILE TELEPHONE WARNING DEVICE

Publication Number WO/1997/026633
Publication Date 24.07.1997
International Application No. PCT/SE1997/000034
International Filing Date 14.01.1997
Chapter 2 Demand Filed 09.07.1997
IPC
G08B 21/24 2006.01
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
21Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
18Status alarms
24Reminder alarms, e.g. anti-loss alarms
H04M 19/04 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
19Current supply arrangements for telephone systems
02providing ringing current or supervisory tones, e.g. dialling tone or busy tone
04the ringing-current being generated at the substations
CPC
G08B 21/023
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
21Alarms responsive to a single specified undesired or abnormal operating condition and not elsewhere provided for
02Alarms for ensuring the safety of persons
0202Child monitoring systems using a transmitter-receiver system carried by the parent and the child
023Power management, e.g. system sleep and wake up provisions
G08B 21/0247
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
21Alarms responsive to a single specified undesired or abnormal operating condition and not elsewhere provided for
02Alarms for ensuring the safety of persons
0202Child monitoring systems using a transmitter-receiver system carried by the parent and the child
0241Data exchange details, e.g. data protocol
0247System arrangements wherein the alarm criteria uses signal strength
G08B 21/24
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
21Alarms responsive to a single specified undesired or abnormal operating condition and not elsewhere provided for
18Status alarms
24Reminder alarms, e.g. anti-loss alarms
H04M 19/04
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
19Current supply arrangements for telephone systems
02providing ringing current or supervisory tones, e.g. dialling tone, busy tone
04ringing-current generated at substation
Applicants
  • DUHS, Henry [SE]/[SE] (AllExceptUS)
  • OLSSON, Tonny [SE]/[SE] (UsOnly)
Inventors
  • OLSSON, Tonny
Agents
  • SUNDSTRÖM, Per
Priority Data
9600126-815.01.1996SE
Publication Language English (EN)
Filing Language Swedish (SV)
Designated States
Title
(EN) MOBILE TELEPHONE WARNING DEVICE
(FR) AVERTISSEUR POUR TELEPHONE MOBILE
Abstract
(EN)
A mobile telephone warning device has a battery-operated (3) detector circuit of low current consumption which is comprised of a transistor switch (2-8, C1, C2, R1, R2, R3, D) that is operative in detecting radio frequency signals captured via an antenna (1). The transistor is connected regeneratively via a low-pass filter (5, 7, C1, C2, R1, R2, D), which enables the transistor to self-adjust its operating point and therewith obtain optimal sensitivity.
(FR)
La présente invention concerne un avertisseur pour téléphone mobile. Il possède un circuit détecteur (3) alimenté par pile(s), de faible consommation, constitué par un commutateur à transistor (2-8, C1, C2, R1, R2, R3, D) et dont le rôle est de détecter la présence des signaux HF reçus par une antenne (1). Le transistor est connecté en montage régénérateur, par l'intermédiaire d'un filtre passe-bas (5, 7, C1, C2, R1, R2, D), ce qui lui permet d'autorégler son point de fonctionnement et, ainsi, d'obtenir la sensibilité optimale.
Also published as
Latest bibliographic data on file with the International Bureau