GB1530291A - Electric impulse transmitters for telephone instruments - Google Patents

Electric impulse transmitters for telephone instruments

Info

Publication number
GB1530291A
GB1530291A GB276475A GB276475A GB1530291A GB 1530291 A GB1530291 A GB 1530291A GB 276475 A GB276475 A GB 276475A GB 276475 A GB276475 A GB 276475A GB 1530291 A GB1530291 A GB 1530291A
Authority
GB
United Kingdom
Prior art keywords
electric
instrument
impulse
digit
line current
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
GB276475A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB276475A priority Critical patent/GB1530291A/en
Publication of GB1530291A publication Critical patent/GB1530291A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/272—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial
    • H04M1/2725—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial using electronic memories

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

1530291 Digit storage in senders GENERAL ELECTRIC CO Ltd 31 Oct 1975 [22 Jan 1975] 2764/75 Heading H4K An electric impulse transmitter for a telephone instrument including an electric storage arrangement for storing selected digit values includes circuitry 14-19 responsive to cessation of line current to the instrument for any period longer than a predetermined one to provide a clear signal for the storage arrangement. The digit values are selected by operation of push buttons or other number-selecting means and corresponding loop break impulse trains are provided by an impulse generator in the instrument. When line current ceases (at line terminals 2) capacitor 19 begins to charge and when a predetermined voltage is reached transistors 14 and 15 are switched ON and the clearance pulse is generated at the collector of 15.
GB276475A 1975-10-31 1975-10-31 Electric impulse transmitters for telephone instruments Expired GB1530291A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB276475A GB1530291A (en) 1975-10-31 1975-10-31 Electric impulse transmitters for telephone instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB276475A GB1530291A (en) 1975-10-31 1975-10-31 Electric impulse transmitters for telephone instruments

Publications (1)

Publication Number Publication Date
GB1530291A true GB1530291A (en) 1978-10-25

Family

ID=9745462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB276475A Expired GB1530291A (en) 1975-10-31 1975-10-31 Electric impulse transmitters for telephone instruments

Country Status (1)

Country Link
GB (1) GB1530291A (en)

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Legal Events

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