GB673788A - Improvements in or relating to circuit-arrangements for use in automatic signalling systems of telephone systems - Google Patents

Improvements in or relating to circuit-arrangements for use in automatic signalling systems of telephone systems

Info

Publication number
GB673788A
GB673788A GB25998/50A GB2599850A GB673788A GB 673788 A GB673788 A GB 673788A GB 25998/50 A GB25998/50 A GB 25998/50A GB 2599850 A GB2599850 A GB 2599850A GB 673788 A GB673788 A GB 673788A
Authority
GB
United Kingdom
Prior art keywords
relay
systems
wire
arrangements
relating
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
GB25998/50A
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 Electrical Industries Ltd
Original Assignee
Philips Electrical 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 Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB673788A publication Critical patent/GB673788A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses
    • H04Q1/36—Pulse-correcting arrangements, e.g. for reducing effects due to interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/10—Metering calls from calling party, i.e. A-party charged for the communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

673,788. Telephone exchange systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Oct. 25, 1950 [Oct. 28, 1949], No. 25998/50. Class 40 (iv). A relay which has to be operated over a conversation wire while conversation is taking place comprises a short - circuited winding. This winding damps out the currents induced in the wire due to the change of flux in the relay on operation and also slows up the rate of operation of the relay so reducing the rate of change of flux. The relay may also comprise a thick residual stop for the same purpose. The relay in question Z may be a metering relay operated by metering pulses from a time zone transmitter TZO which are smoothed by the network R, C6, L4, C5, L3 and applied to the b-wire.
GB25998/50A 1949-10-28 1950-10-25 Improvements in or relating to circuit-arrangements for use in automatic signalling systems of telephone systems Expired GB673788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL673788X 1949-10-28

Publications (1)

Publication Number Publication Date
GB673788A true GB673788A (en) 1952-06-11

Family

ID=19802212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25998/50A Expired GB673788A (en) 1949-10-28 1950-10-25 Improvements in or relating to circuit-arrangements for use in automatic signalling systems of telephone systems

Country Status (3)

Country Link
DE (1) DE828997C (en)
FR (1) FR1026583A (en)
GB (1) GB673788A (en)

Also Published As

Publication number Publication date
DE828997C (en) 1952-01-21
FR1026583A (en) 1953-04-29

Similar Documents

Publication Publication Date Title
GB1067210A (en) Telephone hold program system
CH300209A (en) Electronic discriminator device for telecommunications installations.
GB673788A (en) Improvements in or relating to circuit-arrangements for use in automatic signalling systems of telephone systems
US2041964A (en) Telephone system
GB1023832A (en) Signaling repeaters
US2275352A (en) Call notifying signaling device for engaged telephones
GB655682A (en) Improvements in telephone exchange systems
GB597163A (en) Telephone systems
US1812984A (en) Lockout for outgoing calls for telephone systems
US2094151A (en) Remote control system
GB418903A (en) Improvements in or relating to telephone or like systems
US1652645A (en) Substation circuit
US2511865A (en) Telephone recorder
GB1354796A (en) Control device for dictating equipment
GB1065367A (en) Improvements in or relating to telephone systems
GB669412A (en) Improvements in or relating to impulse-responding circuits for use in telephone or like signalling systems
CA459020A (en) Telephone call transmitter
DE917129C (en) Device to prevent unwanted eavesdropping on telephone calls
GB526833A (en) Improvements in or relating to arrangements for receiving telegraph impulses
AU2988349A (en) Two-wire repeater for toll switching apparatus in telecommunication systems
GB712227A (en) Improvements in or relating to telecommunication systems
JPS51144503A (en) Telephone set
CA455983A (en) Loudspeaking telephone system
GB544276A (en) Improvements in or relating to devices for coin apparatus for telephone plants
GB682579A (en) Improvements in or relating to selective call equipment