GB346004A - Improvements in electrical signalling systems - Google Patents

Improvements in electrical signalling systems

Info

Publication number
GB346004A
GB346004A GB54/30A GB5430A GB346004A GB 346004 A GB346004 A GB 346004A GB 54/30 A GB54/30 A GB 54/30A GB 5430 A GB5430 A GB 5430A GB 346004 A GB346004 A GB 346004A
Authority
GB
United Kingdom
Prior art keywords
devices
compensating
relay
circuit
west
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
GB54/30A
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 GB54/30A priority Critical patent/GB346004A/en
Priority to NL51917A priority patent/NL30726C/xx
Priority to DE1930549974D priority patent/DE549974C/en
Priority to FR714383D priority patent/FR714383A/en
Priority to US501797A priority patent/US1953462A/en
Publication of GB346004A publication Critical patent/GB346004A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Soil Working Implements (AREA)

Abstract

346,004. Repeating systems. STANDARD TELEPHONES & CABLES, Ltd. and BONE, R. S., Columbia House, Aldwych, London. Jan. 1, 1930, No. 54. [Class 40 (iv).] In an electric signalling system in which a plurality of devices (e.g. gain regulators) are provided to compensate for changes in the characteristics of the signals when said signals have departed from a predetermined form (e.g. strength) for a predetermined time, the different compensating devices are given substantially different time constants so as to prevent hunting between the compensating devices. The time constants of these devices preferably progressively increase in the direction of transmission so that each device performs its compensating function before the succeeding device commences its compensating function. The Figure shows one form of delay device comprising a valve V the bias of which is removed by relay B under the control of marginal relay A which is operated by rectified pilot carrier current. The operating time constant is varied by varying resistance R through which condenser C discharges when relay B is operated. Alternatively a bi-metal strip type of thermostat may be employed, or the motors or other driving means may be arranged to run at different speeds. In a two-way system the timing of the compensating devices for the east to west circuit is arranged as in a single circuit and the west to east circuit is similarly arranged with the fastest operating device at the transmitting end.
GB54/30A 1930-01-01 1930-01-01 Improvements in electrical signalling systems Expired GB346004A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB54/30A GB346004A (en) 1930-01-01 1930-01-01 Improvements in electrical signalling systems
NL51917A NL30726C (en) 1930-01-01 1930-05-31
DE1930549974D DE549974C (en) 1930-01-01 1930-06-12 Electrical transmission system with a plurality of amplifiers
FR714383D FR714383A (en) 1930-01-01 1930-07-24 Improvements to electrical signaling systems
US501797A US1953462A (en) 1930-01-01 1930-12-12 Signaling system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB54/30A GB346004A (en) 1930-01-01 1930-01-01 Improvements in electrical signalling systems
NL51917A NL30726C (en) 1930-01-01 1930-05-31
DE549974T 1930-06-12
FR714383T 1930-07-24

Publications (1)

Publication Number Publication Date
GB346004A true GB346004A (en) 1931-04-01

Family

ID=9697578

Family Applications (1)

Application Number Title Priority Date Filing Date
GB54/30A Expired GB346004A (en) 1930-01-01 1930-01-01 Improvements in electrical signalling systems

Country Status (5)

Country Link
US (1) US1953462A (en)
DE (1) DE549974C (en)
FR (1) FR714383A (en)
GB (1) GB346004A (en)
NL (1) NL30726C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748784C (en) * 1937-09-24 1944-11-09 Process for automatic level control of especially wide frequency bands that are transmitted over lines with frequency-dependent damping
DE859489C (en) * 1942-09-23 1952-12-15 Siemens Ag Transmission system with several, separately regulated amplifier sections
DE866354C (en) * 1943-05-13 1953-02-09 Aeg Procedure for level control
US2860180A (en) * 1953-04-27 1958-11-11 Times Facsimile Corp Remote control system for continuous facsimile recorder
US2927165A (en) * 1955-01-25 1960-03-01 Fairstein Edward Non-blocking stabilized feed back amplifier

Also Published As

Publication number Publication date
US1953462A (en) 1934-04-03
DE549974C (en) 1932-05-11
FR714383A (en) 1931-11-20
NL30726C (en) 1933-09-15

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