IT1071838B - Soppressore di impulsi di suoneria indesiderati per apparecchi telefonici - Google Patents

Soppressore di impulsi di suoneria indesiderati per apparecchi telefonici

Info

Publication number
IT1071838B
IT1071838B IT69699/76A IT6969976A IT1071838B IT 1071838 B IT1071838 B IT 1071838B IT 69699/76 A IT69699/76 A IT 69699/76A IT 6969976 A IT6969976 A IT 6969976A IT 1071838 B IT1071838 B IT 1071838B
Authority
IT
Italy
Prior art keywords
telephone equipment
ring pulse
pulse suppressor
unwanted ring
unwanted
Prior art date
Application number
IT69699/76A
Other languages
English (en)
Inventor
Rodolfo Ceruti
Oreste Malerba
Original Assignee
Cselt Centro Studi Lab Telecom
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 Lab Telecom filed Critical Cselt Centro Studi Lab Telecom
Priority to IT69699/76A priority Critical patent/IT1071838B/it
Priority to NLAANVRAGE7709731,A priority patent/NL172909C/xx
Priority to FR7732877A priority patent/FR2371100A1/fr
Priority to JP13091077A priority patent/JPS5361903A/ja
Priority to GB45623/77A priority patent/GB1586690A/en
Priority to DE2749458A priority patent/DE2749458C3/de
Priority to SE7712613A priority patent/SE7712613L/xx
Priority to US05/850,809 priority patent/US4152549A/en
Application granted granted Critical
Publication of IT1071838B publication Critical patent/IT1071838B/it

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)
  • Telephonic Communication Services (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)
IT69699/76A 1976-11-12 1976-11-12 Soppressore di impulsi di suoneria indesiderati per apparecchi telefonici IT1071838B (it)

Priority Applications (8)

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
NLAANVRAGE7709731,A NL172909C (nl) 1976-11-12 1977-09-02 Inschakelketen voor een wekker van een telefoontoesel.
FR7732877A FR2371100A1 (fr) 1976-11-12 1977-11-02 Dispositif de suppression d'impulsions de sonnerie non desirees pour des appareils telephoniques
JP13091077A JPS5361903A (en) 1976-11-12 1977-11-02 Unnecessary signal sound suppressor for telephone set
GB45623/77A GB1586690A (en) 1976-11-12 1977-11-02 Suppressors for telephone sets
DE2749458A DE2749458C3 (de) 1976-11-12 1977-11-04 Vorrichtung zum Unterdrücken unerwünschter Klingeltöne an Fernsprechgeräten
SE7712613A SE7712613L (sv) 1976-11-12 1977-11-08 Telefonapparat
US05/850,809 US4152549A (en) 1976-11-12 1977-11-11 Suppressor of spurious ringing currents for telephone apparatus

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
IT1071838B true IT1071838B (it) 1985-04-10

Family

ID=11312657

Family Applications (1)

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

Country Status (8)

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

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
EP0756409B1 (en) * 1995-07-28 2004-04-14 STMicroelectronics S.r.l. Spurious ting suppression device particularly for auxiliary ringers in socket telephone systems
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

Family Cites Families (6)

* 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
JPS5148847B2 (it) * 1971-11-10 1976-12-23
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

Also Published As

Publication number Publication date
NL7709731A (nl) 1978-05-17
JPS5361903A (en) 1978-06-02
DE2749458A1 (de) 1978-05-18
SE7712613L (sv) 1979-05-13
NL172909C (nl) 1983-11-01
DE2749458B2 (de) 1979-02-01
US4152549A (en) 1979-05-01
GB1586690A (en) 1981-03-25
FR2371100A1 (fr) 1978-06-09
FR2371100B1 (it) 1981-09-11
DE2749458C3 (de) 1986-07-31

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