JPS56501185A - - Google Patents

Info

Publication number
JPS56501185A
JPS56501185A JP50180880A JP50180880A JPS56501185A JP S56501185 A JPS56501185 A JP S56501185A JP 50180880 A JP50180880 A JP 50180880A JP 50180880 A JP50180880 A JP 50180880A JP S56501185 A JPS56501185 A JP S56501185A
Authority
JP
Japan
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
JP50180880A
Other languages
Japanese (ja)
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
Priority claimed from US06/067,717 external-priority patent/US4292604A/en
Priority claimed from US06/067,718 external-priority patent/US4276448A/en
Application filed filed Critical
Publication of JPS56501185A publication Critical patent/JPS56501185A/ja
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M19/00Current supply arrangements for telephone systems
    • H04M19/02Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
  • Dc-Dc Converters (AREA)
  • Electrotherapy Devices (AREA)
  • Telephone Function (AREA)
JP50180880A 1979-08-20 1980-08-01 Pending JPS56501185A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/067,717 US4292604A (en) 1979-08-20 1979-08-20 Relaxation oscillator with plural constant current sources
US06/067,718 US4276448A (en) 1979-08-20 1979-08-20 Electronic tone ringer

Publications (1)

Publication Number Publication Date
JPS56501185A true JPS56501185A (en) 1981-08-20

Family

ID=26748187

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50180880A Pending JPS56501185A (en) 1979-08-20 1980-08-01

Country Status (5)

Country Link
JP (1) JPS56501185A (en)
DE (1) DE3049811C2 (en)
GB (1) GB2071963B (en)
SE (2) SE428986B (en)
WO (1) WO1981000657A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4508937A (en) * 1983-02-28 1985-04-02 At&T Information Systems Inc. Method and circuitry for encoding telephone ringing signals
JPS61237559A (en) * 1985-04-15 1986-10-22 Ricoh Co Ltd Call signal detection circuit
FR2693335B1 (en) * 1992-07-02 1994-08-05 Matra Communication RINGER CIRCUIT, PARTICULARLY FOR TELEPHONE SET.

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740490A (en) * 1971-01-18 1973-06-19 Bell Telephone Labor Inc Tone ringer
CA952634A (en) * 1971-01-18 1974-08-06 Robert F. Mcalonie Tone ringer
DE2205559C3 (en) * 1972-02-07 1980-08-14 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuitry for AC call receiving lines to prevent the effects of DC pulses
US3808379A (en) * 1972-05-30 1974-04-30 Gte Automatic Electric Lab Inc Telephone tone ringer
US3860764A (en) * 1973-01-12 1975-01-14 Itt Electronic tone generator
FR2235556B1 (en) * 1973-06-28 1978-09-08 Person Jean Michel
US3867585A (en) * 1973-08-02 1975-02-18 Gte Automatic Electric Lab Inc Electronic tone ringer
US3965307A (en) * 1974-05-28 1976-06-22 Gte Automatic Electric Laboratories Incorporated Electronic tone ringer
US4046970A (en) * 1976-04-12 1977-09-06 Magnetic Controls Company Ringing detector for telephone circuits
US4081617A (en) * 1976-10-29 1978-03-28 Technex International Ltd. Electronic ringing circuit for telephone systems

Also Published As

Publication number Publication date
SE8204441L (en) 1982-07-23
DE3049811C2 (en) 1987-04-16
GB2071963A (en) 1981-09-23
SE8204441D0 (en) 1982-07-23
GB2071963B (en) 1983-07-27
SE429707B (en) 1983-09-19
WO1981000657A1 (en) 1981-03-05
SE428986B (en) 1983-08-01
SE8102406L (en) 1981-04-14
DE3049811T1 (en) 1982-02-25

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