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GB501234A - Improvements in or relating to two-directional electric telephony systems - Google Patents

Improvements in or relating to two-directional electric telephony systems

Info

Publication number
GB501234A
GB501234A GB10433/38A GB1043338A GB501234A GB 501234 A GB501234 A GB 501234A GB 10433/38 A GB10433/38 A GB 10433/38A GB 1043338 A GB1043338 A GB 1043338A GB 501234 A GB501234 A GB 501234A
Authority
GB
United Kingdom
Prior art keywords
voltage
amplifier
line
suppressor
gli
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
GB10433/38A
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.)
Siemens and Halske AG
Siemens Corp
Original Assignee
Siemens and Halske AG
Siemens Corp
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 Siemens and Halske AG, Siemens Corp filed Critical Siemens and Halske AG
Publication of GB501234A publication Critical patent/GB501234A/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)
  • Testing Relating To Insulation (AREA)

Abstract

501,234. Two - way transmission. SIEMENS & HALSKE AKT.-GES. April 5, 1938; No. 10433. Convention date, April 5, 1937. [Class 40 (iv)] In a two-directional system comprising a two-wire line which branches through forks 3 and 4 to the two sides 1 and 2'of a four-wire system, suppressors S1 and S2 are associated with the side channels in such a manner that when signals are passing along one channel, the suppressor associated with the other channel blocks the latter channel only for signals that are no stronger than the echo signals. The output of an amplifier or amplifier-detector V3 connected to line 1 controls the suppressor 82 and a corresponding amplifier V4 connected to line 2. A steady alternating voltage G of a frequency outside the operating range of frequency of the system is applied to the input of the amplifiers V3 and V4 to ensure that the system remains in a stable rest condition when signalling ceases. The suppressors S1 and S2 may be contacts for making or breaking the respective lines, operated by a polarized relay having two windings energized respectively by the output currents of the amplifiers V3 and V4. The relay may have holding windings so that when signalling ceases the system remains in a stable condition of rest. Alternatively, a non-polarized relay can be used. In the modification shown in Fig. 1a the output of. the amplifier V3 is applied through a transformer 9 to a rectifier circuit and produces a voltage across a resistance W. The amplifier V4 similarly produces an opposing voltage across a resistance W1. The resistances W and W1 are arranged in series with a gas-filled discharge device Gli, a resistance R, and a battery B1. When line 1 is used, the voltage produced across the device Gli is greater than the striking voltage of the device and a current passes through R. The voltage across R is utilized to operate the suppressor S2. When line 2 is used, the voltage across the device Gli is reduced to below the extinguishing voltage and the suppressor is not operated. Specification 430,567 is referred to. Reference has been directed by the Comptroller to Specifications 335,937, [Class 40 (iv)], and 439,752.
GB10433/38A 1937-04-05 1938-04-05 Improvements in or relating to two-directional electric telephony systems Expired GB501234A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202984X 1937-04-05

Publications (1)

Publication Number Publication Date
GB501234A true GB501234A (en) 1939-02-23

Family

ID=5774183

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10433/38A Expired GB501234A (en) 1937-04-05 1938-04-05 Improvements in or relating to two-directional electric telephony systems

Country Status (3)

Country Link
CH (1) CH202984A (en)
FR (1) FR836160A (en)
GB (1) GB501234A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615997A (en) * 1946-12-13 1952-10-28 Kellogg Switchboard & Supply Telephone repeater

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE759529C (en) * 1940-04-26 1954-05-03 Hell Rudolf Dr Ing Feedback lock

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615997A (en) * 1946-12-13 1952-10-28 Kellogg Switchboard & Supply Telephone repeater

Also Published As

Publication number Publication date
CH202984A (en) 1939-02-15
FR836160A (en) 1939-01-12

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