BE884833A - Sonnerie electronique a tonalite - Google Patents

Sonnerie electronique a tonalite

Info

Publication number
BE884833A
BE884833A BE0/201793A BE201793A BE884833A BE 884833 A BE884833 A BE 884833A BE 0/201793 A BE0/201793 A BE 0/201793A BE 201793 A BE201793 A BE 201793A BE 884833 A BE884833 A BE 884833A
Authority
BE
Belgium
Prior art keywords
electronic tone
tone ringer
ringer
electronic
tone
Prior art date
Application number
BE0/201793A
Other languages
English (en)
Original Assignee
Western Electric Co
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 Western Electric Co filed Critical Western Electric Co
Publication of BE884833A publication Critical patent/BE884833A/fr

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)
BE0/201793A 1979-08-20 1980-08-19 Sonnerie electronique a tonalite BE884833A (fr)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
BE884833A true BE884833A (fr) 1980-12-16

Family

ID=22077909

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/201793A BE884833A (fr) 1979-08-20 1980-08-19 Sonnerie electronique a tonalite

Country Status (3)

Country Link
US (1) US4292604A (fr)
BE (1) BE884833A (fr)
CA (1) CA1142609A (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336507A (en) * 1981-01-29 1982-06-22 Motorola, Inc. Current output relaxation oscillator
US4567333A (en) * 1983-02-28 1986-01-28 At&T Technologies Electronic tone ringer with distinctive signaling circuitry
US4599494A (en) * 1984-10-10 1986-07-08 Motorola, Inc. Ring sense telephone tone ringer circuit
US5481228A (en) * 1993-10-15 1996-01-02 Hewlett-Packard Corporation Method and apparatus for controlling oscillator duty cycle
US6060957A (en) * 1998-12-08 2000-05-09 Stmicroelectronics S.A. Relaxation oscillator with low phase noise
US8040142B1 (en) 2006-03-31 2011-10-18 Cypress Semiconductor Corporation Touch detection techniques for capacitive touch sense systems
US8004497B2 (en) * 2006-05-18 2011-08-23 Cypress Semiconductor Corporation Two-pin buttons
US8547114B2 (en) 2006-11-14 2013-10-01 Cypress Semiconductor Corporation Capacitance to code converter with sigma-delta modulator
US8058937B2 (en) * 2007-01-30 2011-11-15 Cypress Semiconductor Corporation Setting a discharge rate and a charge rate of a relaxation oscillator circuit
US9500686B1 (en) 2007-06-29 2016-11-22 Cypress Semiconductor Corporation Capacitance measurement system and methods
US8570053B1 (en) 2007-07-03 2013-10-29 Cypress Semiconductor Corporation Capacitive field sensor with sigma-delta modulator
US8169238B1 (en) 2007-07-03 2012-05-01 Cypress Semiconductor Corporation Capacitance to frequency converter
US8525798B2 (en) 2008-01-28 2013-09-03 Cypress Semiconductor Corporation Touch sensing
US8358142B2 (en) 2008-02-27 2013-01-22 Cypress Semiconductor Corporation Methods and circuits for measuring mutual and self capacitance
US8319505B1 (en) 2008-10-24 2012-11-27 Cypress Semiconductor Corporation Methods and circuits for measuring mutual and self capacitance
US9104273B1 (en) 2008-02-29 2015-08-11 Cypress Semiconductor Corporation Multi-touch sensing method
US8321174B1 (en) 2008-09-26 2012-11-27 Cypress Semiconductor Corporation System and method to measure capacitance of capacitive sensor array

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE441810A (fr) * 1940-06-21
US3886485A (en) * 1972-11-25 1975-05-27 Victor Company Of Japan Linear voltage controlled oscillator including a timing capacitor charged and discharged through current mirror circuits
US3831113A (en) * 1973-06-01 1974-08-20 Rca Corp Relaxation oscillator
JPS5634427Y2 (fr) * 1974-04-08 1981-08-14
US3924202A (en) * 1974-08-21 1975-12-02 Rca Corp Electronic oscillator
DE2712369C2 (de) * 1977-03-22 1981-09-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Oszillator zur Erzeugung von Rechteckimpulsen
US4205279A (en) * 1977-09-12 1980-05-27 Motorola, Inc. CMOS Low current RC oscillator

Also Published As

Publication number Publication date
US4292604A (en) 1981-09-29
CA1142609A (fr) 1983-03-08

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: WESTERN ELECTRIC CY INC.

Effective date: 19880831