JPS5361903A - Unnecessary signal sound suppressor for telephone set - Google Patents

Unnecessary signal sound suppressor for telephone set

Info

Publication number
JPS5361903A
JPS5361903A JP13091077A JP13091077A JPS5361903A JP S5361903 A JPS5361903 A JP S5361903A JP 13091077 A JP13091077 A JP 13091077A JP 13091077 A JP13091077 A JP 13091077A JP S5361903 A JPS5361903 A JP S5361903A
Authority
JP
Japan
Prior art keywords
telephone set
signal sound
unnecessary signal
sound suppressor
suppressor
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP13091077A
Other languages
English (en)
Inventor
Serutsuchi Rodorufuo
Mareruba Oresute
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecom Italia SpA
Original Assignee
CSELT Centro Studi e Laboratori Telecomunicazioni SpA
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 CSELT Centro Studi e Laboratori Telecomunicazioni SpA filed Critical CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Publication of JPS5361903A publication Critical patent/JPS5361903A/ja
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
JP13091077A 1976-11-12 1977-11-02 Unnecessary signal sound suppressor for telephone set Pending JPS5361903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT69699/76A IT1071838B (it) 1976-11-12 1976-11-12 Soppressore di impulsi di suoneria indesiderati per apparecchi telefonici

Publications (1)

Publication Number Publication Date
JPS5361903A true JPS5361903A (en) 1978-06-02

Family

ID=11312657

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13091077A Pending JPS5361903A (en) 1976-11-12 1977-11-02 Unnecessary signal sound suppressor for telephone set

Country Status (8)

Country Link
US (1) US4152549A (ja)
JP (1) JPS5361903A (ja)
DE (1) DE2749458C3 (ja)
FR (1) FR2371100A1 (ja)
GB (1) GB1586690A (ja)
IT (1) IT1071838B (ja)
NL (1) NL172909C (ja)
SE (1) SE7712613L (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213012A (en) * 1978-11-03 1980-07-15 General Signal Corporation Discriminating means for telephone circuits
US4529844A (en) * 1983-09-26 1985-07-16 Dong Jun Industrial Co., Ltd. Pulse output telephone system with ring tap elimination
SE459138B (sv) * 1987-10-08 1989-06-05 Ericsson Telefon Ab L M Anordning i ett telekommunikationssystem vid inkoppling och urkoppling av en ringsignal
IT1254795B (it) * 1992-02-17 1995-10-11 St Microelectronics Srl Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina.
US5465297A (en) * 1994-03-11 1995-11-07 Design Tech International Inc. Telephone line seizure circuit
DE69532885D1 (de) * 1995-07-28 2004-05-19 St Microelectronics Srl Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen
JP2006325088A (ja) * 2005-05-20 2006-11-30 Nec Infrontia Corp 電話装置、電話交換機及び電話回線接続方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4855605A (ja) * 1971-11-10 1973-08-04

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1465926A (fr) * 1966-01-26 1967-01-13 Ericsson Telefon Ab L M Dispositif semi-conducteur à seuil utilisé dans un circuit téléphonique pour empêcher le courant continu de passer et éteindre les étincelles
GB1318870A (en) * 1969-07-09 1973-05-31 Gen Electric Co Ltd Telephone apparatus incorporating a tone caller
DE2205559C3 (de) * 1972-02-07 1980-08-14 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Schaltungsanordnung für Wechselstrom-Anrufempfangsstrecken zur Verhinderung der Einwirkung von Gleichstromimpulsen
FR2269251A1 (en) * 1974-04-26 1975-11-21 Trt Telecom Radio Electr Telephone receiver with ringing apparatus - has bell permanently across line with shunt to prevent outgoing calls ringing local bell
US4031332A (en) * 1976-02-02 1977-06-21 Cook Electric Company Telephone ringer insolator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4855605A (ja) * 1971-11-10 1973-08-04

Also Published As

Publication number Publication date
SE7712613L (sv) 1979-05-13
NL172909C (nl) 1983-11-01
DE2749458B2 (de) 1979-02-01
US4152549A (en) 1979-05-01
NL7709731A (nl) 1978-05-17
DE2749458A1 (de) 1978-05-18
DE2749458C3 (de) 1986-07-31
GB1586690A (en) 1981-03-25
FR2371100A1 (fr) 1978-06-09
IT1071838B (it) 1985-04-10
FR2371100B1 (ja) 1981-09-11

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