GB2071963A - Electronic toner ringer - Google Patents

Electronic toner ringer

Info

Publication number
GB2071963A
GB2071963A GB8112103A GB8112103A GB2071963A GB 2071963 A GB2071963 A GB 2071963A GB 8112103 A GB8112103 A GB 8112103A GB 8112103 A GB8112103 A GB 8112103A GB 2071963 A GB2071963 A GB 2071963A
Authority
GB
United Kingdom
Prior art keywords
ringer
line
current
current sources
insensitivity
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.)
Granted
Application number
GB8112103A
Other versions
GB2071963B (en
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB2071963A publication Critical patent/GB2071963A/en
Application granted granted Critical
Publication of GB2071963B publication Critical patent/GB2071963B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current 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)
  • Telephone Function (AREA)
  • Electrotherapy Devices (AREA)

Abstract

An electronic tone ringer responds to ringing signals on a telephone line while being unresponsive to dialing pulses or other signals on the line. Powered directly from the telephone line the ringer uses current sources to provide a high impedance to the ringer circuitry and an insensitivity to line voltage variations so that reliable operation of the ringer is maintained on long loops and with multiple ringers terminated on the line. A multitone signal for activating an electroacoustic transducer (300) is provided by frequency modulating a single oscillator (500) within the tone ringer. Frequency stability of the oscillator is insured by the use of interrelated constant current sources that provide an insensitivity to supply voltage variations over a wide range. Two of the current sources determine the duty cycle by controlling the charge and discharge current of a capacitor in the circuit. A third current source determines the voltage swing on the capacitor. By varying the current output from the third current source, the generator circuit provides a variable frequency signal.
GB8112103A 1979-08-20 1980-08-01 Electronic toner ringer Expired GB2071963B (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 (2)

Publication Number Publication Date
GB2071963A true GB2071963A (en) 1981-09-23
GB2071963B GB2071963B (en) 1983-07-27

Family

ID=26748187

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8112103A Expired GB2071963B (en) 1979-08-20 1980-08-01 Electronic toner ringer

Country Status (5)

Country Link
JP (1) JPS56501185A (en)
DE (1) DE3049811T1 (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
SE8102406L (en) 1981-04-14
WO1981000657A1 (en) 1981-03-05
DE3049811T1 (en) 1982-02-25
SE428986B (en) 1983-08-01
JPS56501185A (en) 1981-08-20
SE8204441L (en) 1982-07-23
SE429707B (en) 1983-09-19
SE8204441D0 (en) 1982-07-23
GB2071963B (en) 1983-07-27
DE3049811C2 (en) 1987-04-16

Similar Documents

Publication Publication Date Title
CA2035411A1 (en) Ringing circuit for use in portable telephone set
US4292604A (en) Relaxation oscillator with plural constant current sources
US3867585A (en) Electronic tone ringer
US4001816A (en) Electronic chime
US4315109A (en) Electronic ring sounder for a speaker telephone
US3808379A (en) Telephone tone ringer
GB2071963A (en) Electronic toner ringer
KR860000747A (en) Sine wave ring generator
US4359610A (en) Telephone ringing circuit
JPS61120558A (en) Call signal transmission circuit
US3740490A (en) Tone ringer
CA1142662A (en) Electronic tone ringer
US3919493A (en) Telephone ringing circuit
US3849606A (en) Tone ringer
CN85103135A (en) Circuit of telephone bell with electronic music
GB989232A (en) Improvements in or relating to signalling circuits
JPS57119527A (en) Radio with digital clock
GB1524107A (en) Circuit arrangement for an acoustic generator
JPH0143760Y2 (en)
KR820001698B1 (en) Tone ringer circuit
JPH01142247U (en)
JPS5687971A (en) Electronic ring trip circuit
KR810000817Y1 (en) Tone-ringer
KR900011242Y1 (en) Circuit to control audio system
RU4877U1 (en) TELEPHONE MICRO TRANSMITTER

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee