GB879146A - Transistor oscillators - Google Patents

Transistor oscillators

Info

Publication number
GB879146A
GB879146A GB330/58A GB33058A GB879146A GB 879146 A GB879146 A GB 879146A GB 330/58 A GB330/58 A GB 330/58A GB 33058 A GB33058 A GB 33058A GB 879146 A GB879146 A GB 879146A
Authority
GB
United Kingdom
Prior art keywords
effected
line
jan
capacitor
station
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
GB330/58A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB879146A publication Critical patent/GB879146A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04M15/08—Metering calls to called party, i.e. B-party charged for the communication
    • 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
    • H04M15/36—Charging, billing or metering arrangements for party-lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)

Abstract

879,146. Automatic exchange systems. STANDARD TELEPHONES & CABLES Ltd. Jan. 3, 1958 [Jan. 8, 1957], No. 330/58. Addition to 777,099. Class 40 (4). A party line sub-station has a resistancecapacity coupled transistor oscillator connected across its dial contacts the frequency of oscillation identifying the sub-station. As shown, Fig. 1, the oscillator 11 is shunted across the dial contacts 13 and comprises a junction transistor powered by D.C. received from the line with feedback between collector-emitter and base-emitter circuits effected by a phase-shift circuit comprising capacities C1 . . . C3 and resistances R1 . . . R3. The load resistance RL2 is high compared with the usual leakage resistance of the line. In a modification, Fig. 2, a two-stage transistor circuit 27, 28 is used, zero-phase back-coupling between transistors 28 and 27 being effected by a Wien bridge circuit comprising the series-connected resistor and capacitor 34, 33 and the parallel-connected resistor and capacitor 36, 35. Recognition of the signals at the exchange 21 may be effected as described in the parent Specification.
GB330/58A 1957-01-08 1958-01-03 Transistor oscillators Expired GB879146A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US879146XA 1957-01-08 1957-01-08

Publications (1)

Publication Number Publication Date
GB879146A true GB879146A (en) 1961-10-04

Family

ID=22208013

Family Applications (2)

Application Number Title Priority Date Filing Date
GB24004/55A Expired GB777099A (en) 1957-01-08 1955-08-19 Party line identification system
GB330/58A Expired GB879146A (en) 1957-01-08 1958-01-03 Transistor oscillators

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB24004/55A Expired GB777099A (en) 1957-01-08 1955-08-19 Party line identification system

Country Status (2)

Country Link
DE (1) DE1074669B (en)
GB (2) GB777099A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3036159A (en) * 1954-06-24 1962-05-22 Ralph D Collins Telephone identification system
US3025354A (en) * 1957-12-23 1962-03-13 Itt Party line substation identification system
DE1264519B (en) * 1965-09-10 1968-03-28 Standard Elektrik Lorenz Ag Data transmission in a telephone exchange to which subscriber sets and subscriber sets with a number switch set up for tone-frequency touch dialing are connected
DE1254698B (en) * 1965-09-22 1967-11-23 Siemens Ag Circuit arrangement for subscriber stations in telephone systems with keypad selection

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE862917C (en) * 1951-07-12 1953-01-15 Siemens Ag Telephone station with carbon microphone and power supply from the office

Also Published As

Publication number Publication date
GB777099A (en) 1957-06-19
DE1074669B (en) 1960-02-04

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