WO1992014332A3 - An emergency call unit - Google Patents

An emergency call unit Download PDF

Info

Publication number
WO1992014332A3
WO1992014332A3 PCT/GB1992/000218 GB9200218W WO9214332A3 WO 1992014332 A3 WO1992014332 A3 WO 1992014332A3 GB 9200218 W GB9200218 W GB 9200218W WO 9214332 A3 WO9214332 A3 WO 9214332A3
Authority
WO
WIPO (PCT)
Prior art keywords
call unit
circuit
seizing
actuating circuit
pstn
Prior art date
Application number
PCT/GB1992/000218
Other languages
French (fr)
Other versions
WO1992014332A2 (en
Inventor
Duncan Miles Johnson
Michael Henley
Steven Paul Crompton
Original Assignee
Modern Vitalcall Ltd
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 Modern Vitalcall Ltd filed Critical Modern Vitalcall Ltd
Publication of WO1992014332A2 publication Critical patent/WO1992014332A2/en
Publication of WO1992014332A3 publication Critical patent/WO1992014332A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)

Abstract

In the combination of a call unit (20) for an emergency call system with a remote trigger device (54), the call unit incorporates means for transmitting and receiving speech and/or data via the public switched telephone network (PSTN) in a hands-free mode. The remote trigger device (54), which may be a pendant (54) includes a keyboard (56) connected to a signal transmitter for remote operation of the transmitting and receiving means. The call unit includes a telephone line seizing system which comprises an actuating circuit and a seizing circuit. The actuating circuit comprises a resistor (82) for limiting current drawn from the PSTN, a switch (86) to make and break the actuating circuit and a darlington transistor (90) actuated by the actuating circuit to complete the seizing circuit and thereby seize the telephone line. The system will work to allow outgoing calls even if there is a mains electricity power cut.
PCT/GB1992/000218 1991-02-08 1992-02-05 An emergency call unit WO1992014332A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919102705A GB9102705D0 (en) 1991-02-08 1991-02-08 An emergency call unit
GB9102705.2 1991-02-08

Publications (2)

Publication Number Publication Date
WO1992014332A2 WO1992014332A2 (en) 1992-08-20
WO1992014332A3 true WO1992014332A3 (en) 1992-10-01

Family

ID=10689733

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/000218 WO1992014332A2 (en) 1991-02-08 1992-02-05 An emergency call unit

Country Status (3)

Country Link
EP (1) EP0570425A1 (en)
GB (1) GB9102705D0 (en)
WO (1) WO1992014332A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1271639B (en) * 1994-05-06 1997-06-04 Italtel Spa INTERACTIVE TELEVISION SYSTEM

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3324517A1 (en) * 1983-07-07 1985-01-17 ANT Nachrichtentechnik GmbH, 7150 Backnang Emergency call system
GB2166321A (en) * 1984-11-02 1986-04-30 Tunstall Telecom Ltd Emergency call unit
EP0210889A1 (en) * 1985-06-27 1987-02-04 AZUR ELECTRONIQUE SERVICE Société à Responsabilité Limitée High-security modular monitoring and alarm centre and operating method therefor
GB2207836A (en) * 1987-07-17 1989-02-08 Raitel Communications Limited Telecommunication equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3324517A1 (en) * 1983-07-07 1985-01-17 ANT Nachrichtentechnik GmbH, 7150 Backnang Emergency call system
GB2166321A (en) * 1984-11-02 1986-04-30 Tunstall Telecom Ltd Emergency call unit
EP0210889A1 (en) * 1985-06-27 1987-02-04 AZUR ELECTRONIQUE SERVICE Société à Responsabilité Limitée High-security modular monitoring and alarm centre and operating method therefor
GB2207836A (en) * 1987-07-17 1989-02-08 Raitel Communications Limited Telecommunication equipment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Nachrichten Elektronik + Telematik (NET), vol. 40, no. special 1, March 1986, Heidelberg, DE; "Sicherheit am Handgelenk", pages 22-24, see page 23, middle column, line 6 - page 24, left-hand column, line 26; figures *

Also Published As

Publication number Publication date
GB9102705D0 (en) 1991-03-27
WO1992014332A2 (en) 1992-08-20
EP0570425A1 (en) 1993-11-24

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