GB740258A - Electronic ringing current generator - Google Patents

Electronic ringing current generator

Info

Publication number
GB740258A
GB740258A GB12356/53A GB1235653A GB740258A GB 740258 A GB740258 A GB 740258A GB 12356/53 A GB12356/53 A GB 12356/53A GB 1235653 A GB1235653 A GB 1235653A GB 740258 A GB740258 A GB 740258A
Authority
GB
United Kingdom
Prior art keywords
valve
oscillator
ringing
generator
valves
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.)
Expired
Application number
GB12356/53A
Other languages
English (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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories 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
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Publication of GB740258A publication Critical patent/GB740258A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
    • H03B5/22—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being vacuum tube

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB12356/53A 1952-06-13 1953-05-04 Electronic ringing current generator Expired GB740258A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US293293A US2667632A (en) 1952-06-13 1952-06-13 Electronic ringing current generator

Publications (1)

Publication Number Publication Date
GB740258A true GB740258A (en) 1955-11-09

Family

ID=23128502

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12356/53A Expired GB740258A (en) 1952-06-13 1953-05-04 Electronic ringing current generator

Country Status (4)

Country Link
US (2) US2667632A (en:Method)
BE (1) BE520260A (en:Method)
DE (1) DE934711C (en:Method)
GB (1) GB740258A (en:Method)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884488A (en) * 1952-07-28 1959-04-28 Gen Dynamics Corp Telephone system
US2832838A (en) * 1952-07-28 1958-04-29 Gen Dynamics Corp Electronic ringing apparatus
US2834954A (en) * 1953-04-15 1958-05-13 Gen Dynamics Corp Multi-frequency ringing machine
US3047736A (en) * 1957-12-02 1962-07-31 Warren Mfg Company Inc Transistor switching amplifier
US3003041A (en) * 1958-01-06 1961-10-03 Automatic Elect Lab Electronic telephone system and ringing tone generator therefor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502687A (en) * 1944-12-30 1950-04-04 Rca Corp Multivibrator and control of same
US2561747A (en) * 1945-09-18 1951-07-24 Bell Telephone Labor Inc Volume limiting amplifier
US2457131A (en) * 1946-09-25 1948-12-28 Faximile Inc Facsimile overload control with nonlinear resistance in output
IT454187A (en:Method) * 1948-05-31 1900-01-01
US2585022A (en) * 1948-08-19 1952-02-12 Standard Telephones Cables Ltd Ringing current supply system for telephones

Also Published As

Publication number Publication date
BE520260A (en:Method)
DE934711C (de) 1955-11-03
US2667632A (en) 1954-01-26
USRE24096E (en) 1955-11-22

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