GB665274A - Improvements in or relating to telephone set circuits - Google Patents

Improvements in or relating to telephone set circuits

Info

Publication number
GB665274A
GB665274A GB30248/48A GB3024848A GB665274A GB 665274 A GB665274 A GB 665274A GB 30248/48 A GB30248/48 A GB 30248/48A GB 3024848 A GB3024848 A GB 3024848A GB 665274 A GB665274 A GB 665274A
Authority
GB
United Kingdom
Prior art keywords
transmitter
receiver
wire
line
saturable reactors
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
GB30248/48A
Inventor
James Samuel Paterson Roberton
Lyndall Crossthwaite Pocock
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
Priority to GB30248/48A priority Critical patent/GB665274A/en
Publication of GB665274A publication Critical patent/GB665274A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F9/00—Magnetic amplifiers
    • H03F9/02—Magnetic amplifiers current-controlled, i.e. the load current flowing in both directions through a main coil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

665,274. Anti-side-tone circuits. STANDARD TELEPHONES & CABLES, Ltd. Nov. 18, 1949 [Nov. 22, 1948], No. 30248/48. Class 40 (iv). Sub-station sets make use of saturable reactors as voice operated switches. A receiver Rec, Fig. 3, is normally operative but when the sound received by a transmitter Tm exceeds a predetermined threshold level, a rectifier bridge BR1 applies direct current to the control windings A1, A2 of saturable reactors MSR1, MSR2 to reduce the impedance of the controlled windings B1, B2. B2 then has a large shunting effect on the receiver Rec, which becomes inoperative, and B1 increases the coupling between the transmitter and line. A modification, Fig. 8, includes a line balancing impedance X, the transmitter and receiver being in series and shunt respectively with the saturable reactors MSR1, MSR2. A low residual side tone exists. In Fig. 9, the line balancing impedance is replaced by a rectifier bridge BR2 which also feeds the saturable reactor, so reducing the power taken directly from the transmitter. Fig. 13 shows a 4- wire system, the output of a transmitter, before amplification, controlling the impedances of both outgoing and incoming circuits. Fig. 14 shows a 2-way radio link system in which receiver and transmitter are connected to a desk set and then by a 2-wire line to a hybrid circuit, the outgoing side of the 4-wire circuit leading through an echo-suppressor type voicooperated switch VOS to a radio sender and the return side of the 4-wire circuit coming from a radio receiver.
GB30248/48A 1948-11-22 1948-11-22 Improvements in or relating to telephone set circuits Expired GB665274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB30248/48A GB665274A (en) 1948-11-22 1948-11-22 Improvements in or relating to telephone set circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30248/48A GB665274A (en) 1948-11-22 1948-11-22 Improvements in or relating to telephone set circuits

Publications (1)

Publication Number Publication Date
GB665274A true GB665274A (en) 1952-01-23

Family

ID=10304633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30248/48A Expired GB665274A (en) 1948-11-22 1948-11-22 Improvements in or relating to telephone set circuits

Country Status (1)

Country Link
GB (1) GB665274A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136864A (en) * 1959-10-05 1964-06-09 Automatic Elect Lab Loudspeaking telephone with electronic voice switching

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136864A (en) * 1959-10-05 1964-06-09 Automatic Elect Lab Loudspeaking telephone with electronic voice switching

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