GB219927A - - Google Patents

Info

Publication number
GB219927A
GB219927A GB3488/24A GB348824A GB219927A GB 219927 A GB219927 A GB 219927A GB 3488/24 A GB3488/24 A GB 3488/24A GB 348824 A GB348824 A GB 348824A GB 219927 A GB219927 A GB 219927A
Authority
GB
United Kingdom
Prior art keywords
relay
paths
shunt
contact
amplifying
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
GB3488/24A
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.)
WESTERN ELECTRIC Co Ltd
Original Assignee
WESTERN ELECTRIC Co 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 WESTERN ELECTRIC Co Ltd filed Critical WESTERN ELECTRIC Co Ltd
Publication of GB219927A publication Critical patent/GB219927A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Selective Calling Equipment (AREA)

Abstract

219,927. Western Electric Co., Ltd., (Assignees of Blackwell, O. B.). Aug. 3, 1923, [Convention date]. Addition to 211,135. Repeating and amplifying systems.-In a fourwire line comprising paths 3, 10, Fig. 1, with one-way repeaters and echo suppressor circuits which cause a shunt to be connected across one path when transmission takes place in the other, the echo suppressor circuits 19, 17 are connected to the paths 3, 10 near their outgoing ends 8, 2 so that they may be adusted to return to normal almost immediately upon the cessation of currents in one direction. The input leads 30,. 31, Fig. 2, of the suppressor circuit are connected through an amplifying valve 33 and a rectifying valve 35 to a relay 36, the tuned primary of the transformer 32 acting as a highpass filter and a shunt condenser 46 as a lowpass filter. Upon energization of the relay 36, a relay 41 operates in parallel with a relay 39 to close the shunting contact 45, and is locked over a contact of the relay 39, which is made slow to release by means of an auxiliary winding. shunted by an adjustable resistance 44.
GB3488/24A 1923-02-07 1924-02-11 Expired GB219927A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US617512A US1526550A (en) 1923-02-07 1923-02-07 Two-way transmission with repeaters

Publications (1)

Publication Number Publication Date
GB219927A true GB219927A (en) 1925-05-11

Family

ID=24473926

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3101/24A Expired GB211135A (en) 1923-02-07 1924-02-06 Improvements in two-way transmission systems with repeaters, particularly for telephone lines
GB3488/24A Expired GB219927A (en) 1923-02-07 1924-02-11

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB3101/24A Expired GB211135A (en) 1923-02-07 1924-02-06 Improvements in two-way transmission systems with repeaters, particularly for telephone lines

Country Status (2)

Country Link
US (1) US1526550A (en)
GB (2) GB211135A (en)

Also Published As

Publication number Publication date
US1526550A (en) 1925-02-17
GB211135A (en) 1925-05-06

Similar Documents

Publication Publication Date Title
US2273945A (en) Two-way speech transmission
GB219927A (en)
US1865165A (en) Transmission control circuits
GB280957A (en)
US2054906A (en) Transmission control in signaling systems
GB397551A (en) Improvements in electrical impedance networks and amplifiers
US1711562A (en) Echo-suppressor circuits
US2082185A (en) Receiving apparatus for communication systems for railway trains
US2004759A (en) Ringing repeater
US1254472A (en) Signaling-circuit.
US1734121A (en) Electrical wave transmission system
US1695813A (en) Electric-current transmission
US1953496A (en) Long distance telephone system
US1340942A (en) Signaling system
US1903888A (en) Two-way telephone system
US1576561A (en) Arrangement for exercising remote control over repeaters
GB279455A (en) Improvements in telephone and like repeater circuits
GB501234A (en) Improvements in or relating to two-directional electric telephony systems
GB287847A (en) Filter for preventing distortion of currents of telephonic frequencies
US1280969A (en) Through-ringing amplifier.
US1690153A (en) Selective echo suppressor
US2058198A (en) Two-way carrier wave system
US1595142A (en) Means for preventing bias in telegraph systems
US1738536A (en) Echo suppressor
GB412611A (en) Improvements in or relating to telephone and like signalling systems