SG44843A1 - Device for detecting the activation of a parallel connected telephone set - Google Patents

Device for detecting the activation of a parallel connected telephone set

Info

Publication number
SG44843A1
SG44843A1 SG1996008565A SG1996008565A SG44843A1 SG 44843 A1 SG44843 A1 SG 44843A1 SG 1996008565 A SG1996008565 A SG 1996008565A SG 1996008565 A SG1996008565 A SG 1996008565A SG 44843 A1 SG44843 A1 SG 44843A1
Authority
SG
Singapore
Prior art keywords
activation
detecting
telephone set
parallel connected
connected telephone
Prior art date
Application number
SG1996008565A
Inventor
Peter Sattler
Original Assignee
Philips Electronics Nv
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 Philips Electronics Nv filed Critical Philips Electronics Nv
Publication of SG44843A1 publication Critical patent/SG44843A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Telephone Function (AREA)
SG1996008565A 1992-10-14 1993-10-06 Device for detecting the activation of a parallel connected telephone set SG44843A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92203159 1992-10-14

Publications (1)

Publication Number Publication Date
SG44843A1 true SG44843A1 (en) 1997-12-19

Family

ID=8210972

Family Applications (1)

Application Number Title Priority Date Filing Date
SG1996008565A SG44843A1 (en) 1992-10-14 1993-10-06 Device for detecting the activation of a parallel connected telephone set

Country Status (4)

Country Link
EP (1) EP0593120A1 (en)
JP (1) JPH06205102A (en)
KR (1) KR940010617A (en)
SG (1) SG44843A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69628671T2 (en) * 1995-12-22 2003-12-18 Thomson Consumer Electronics, Inc. TELEPHONE INTERFACE CIRCUIT FOR FORK SWITCHES
KR100281540B1 (en) * 1996-07-08 2001-02-15 윤종용 Video telephone apparatus having line usage control function and line usage control method
KR100216264B1 (en) * 1996-07-12 1999-08-16 구본준 Telephone controlling apparatus
KR100833233B1 (en) 2005-10-05 2008-05-28 삼성전자주식회사 Method and apparatus for detecting off-hook of a parallel-connected telephone

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2014826B (en) * 1978-02-21 1982-03-31 Cohen E Telephone intruder alarm system
DE3715580A1 (en) * 1987-05-09 1988-11-24 Standard Elektrik Lorenz Ag CIRCUIT ARRANGEMENT FOR MONITORING A TELEPHONE CONNECTION LINE
JPH01209852A (en) * 1988-02-18 1989-08-23 Tenshiyou Denki Kogyo Kk Busy state detector for parallel connection telephone set and privacy call device
US4998271A (en) * 1989-08-28 1991-03-05 Venture Technologies, Inc. Telephone accessory
EP0454262A1 (en) * 1990-04-26 1991-10-30 Koninklijke KPN N.V. Electronic circuit for signalling and/or preventing improper use of a telephone subscriber line
FR2672757B1 (en) * 1991-02-08 1999-02-26 France Telecom DEVICE FOR DETECTING AN UNAUTHORIZED CONNECTION ON A SUBSCRIBER TELEPHONE LINE.

Also Published As

Publication number Publication date
JPH06205102A (en) 1994-07-22
KR940010617A (en) 1994-05-26
EP0593120A1 (en) 1994-04-20

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