GB984580A - Improvements in or relating to circuit arrangements for automatic telephone systems - Google Patents

Improvements in or relating to circuit arrangements for automatic telephone systems

Info

Publication number
GB984580A
GB984580A GB3483762A GB3483762A GB984580A GB 984580 A GB984580 A GB 984580A GB 3483762 A GB3483762 A GB 3483762A GB 3483762 A GB3483762 A GB 3483762A GB 984580 A GB984580 A GB 984580A
Authority
GB
United Kingdom
Prior art keywords
signal
circuit
keysender
relay
winding
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
GB3483762A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB984580A publication Critical patent/GB984580A/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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

984,580. Automatic exchanges. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Sept. 12, 1962 [Sept. 15, 1961], No. 34837/62. Heading H4K. In a system in which a subscriber's set is provided with a keysender for sending audio frequencies indicative of a wanted subscriber's number, the microphone is kept disconneected until a relay is operated by a signal from the exchange, which signal is sent only when all the digits have been received. Closure of the hookswitch H connects up keysender 3 and connects winding R1 of relay R in place of the " tone ringer " 10. When all the digits have been received at the exchange, the receiver 2 reverts a " ringing signal " which brings up relay R over its winding R1. This disconnects keysender 3, connects up the microphone 5 and receiver 7 and completes a holding circuit for R through winding R2. A capacitative shunt across r may be provided to permit passage of " dialling " tone. A circuit which has a high impedance only when the supply to point 14 is removed may be connected in series with capacitor 13 to prevent dissipation of speech signals in signal receiver 9. This circuit may comprise a saturable reactor, a threshold circuit or a diode.
GB3483762A 1961-09-15 1962-09-12 Improvements in or relating to circuit arrangements for automatic telephone systems Expired GB984580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL269292 1961-09-15

Publications (1)

Publication Number Publication Date
GB984580A true GB984580A (en) 1965-02-24

Family

ID=19753285

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3483762A Expired GB984580A (en) 1961-09-15 1962-09-12 Improvements in or relating to circuit arrangements for automatic telephone systems

Country Status (5)

Country Link
BE (1) BE622438A (en)
CH (1) CH395205A (en)
DE (1) DE1159041B (en)
GB (1) GB984580A (en)
NL (1) NL269292A (en)

Also Published As

Publication number Publication date
DE1159041B (en) 1963-12-12
BE622438A (en)
NL269292A (en)
CH395205A (en) 1965-07-15

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