GB340693A - Improvements in or relating to telephone circuits - Google Patents

Improvements in or relating to telephone circuits

Info

Publication number
GB340693A
GB340693A GB3377029A GB3377029A GB340693A GB 340693 A GB340693 A GB 340693A GB 3377029 A GB3377029 A GB 3377029A GB 3377029 A GB3377029 A GB 3377029A GB 340693 A GB340693 A GB 340693A
Authority
GB
United Kingdom
Prior art keywords
receiver
induction coil
resistance
winding
automatic
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
GB3377029A
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.)
COVENTRY AUTOM TELEPHONES Ltd
Original Assignee
COVENTRY AUTOM TELEPHONES 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 COVENTRY AUTOM TELEPHONES Ltd filed Critical COVENTRY AUTOM TELEPHONES Ltd
Priority to GB3377029A priority Critical patent/GB340693A/en
Publication of GB340693A publication Critical patent/GB340693A/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
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

340,693. Substation circuits. KAHL, A. R. and COVENTRY AUTOMATIC TELEPHONES, Ltd., of General Electric Co., Stoke, Coventry. Nov. 6, 1929, No. 33770. [Class 40 (iv).] In anti-side-tone substation circuits, the receiver R and a third winding C of the induction coil are connected in series across a resistance X, the arrangement being such that during transmission the potential drop across the resistance opposes the voltage induced in the winding C to prevent response of the receiver whilst during reception the potential drop in X assists the induced voltage in C to produce an augmented effect in the receiver. Figs. 3, 6 show respectively circuit arrangements for a centralbattery automatic-exchange substation and a localbattery operator's cir - cuit. Other circuit arrangements are shown for (1) a manualexchange s u b - station, (2) an automaticexchange s u b - station desk set with a fourwire connection between the standard transmitter - receiver - dial unit and the induction coil, resistance X, condenser and bell, and (3) a further automatic set employing a standard unit consisting of bell, condenser and two-winding induction coil connected by a three-wire connection to a modified unit comprising the transmitter, receiver, dial, resistance X, and an additional three-winding induction coil.
GB3377029A 1929-11-06 1929-11-06 Improvements in or relating to telephone circuits Expired GB340693A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3377029A GB340693A (en) 1929-11-06 1929-11-06 Improvements in or relating to telephone circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3377029A GB340693A (en) 1929-11-06 1929-11-06 Improvements in or relating to telephone circuits

Publications (1)

Publication Number Publication Date
GB340693A true GB340693A (en) 1931-01-08

Family

ID=10357212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3377029A Expired GB340693A (en) 1929-11-06 1929-11-06 Improvements in or relating to telephone circuits

Country Status (1)

Country Link
GB (1) GB340693A (en)

Similar Documents

Publication Publication Date Title
GB340693A (en) Improvements in or relating to telephone circuits
McNish The magnetic storm of March 24, 1940
US2990457A (en) Tandem echo suppressor circuits
GB530257A (en) Improvements in telephone instrument circuits
GB353421A (en) Improvements relating to telephone instrument circuits
GB457215A (en) Improvements in or relating to telephone circuits
US1458988A (en) Means for equalizing transmission over lines of different electrical characteristics
US1907147A (en) Transmission circuits
GB448011A (en) Improved circuit arrangements for telephone or like instruments
US1689598A (en) Telephone substation circuits
GB372400A (en) Improvements relating to telephone instrument circuits
US1471388A (en) Signaling circuit
GB511955A (en) Improvements in or relating to telephone subset circuits
GB397551A (en) Improvements in electrical impedance networks and amplifiers
US1930537A (en) Substation telephone circuit
GB450272A (en) Improvements in apparatus for receiving electrical signals
US2024280A (en) Means to reduce the effect of interfering currents on telephone circuits
GB363512A (en) Improvements relating to telephone instrument circuits
US1396760A (en) Signaling-circuit
US2202386A (en) Telephone circuit
US1471404A (en) Signaling circuit
GB525462A (en) Improvements in or relating to two-way telephone and telegraph circuits
US1399775A (en) Common-battery substation
US1624057A (en) Telephone substation circuits
US1362613A (en) Means for neutralizing interfering disturbances