GB514099A - Improvements in or relating to long distance telephony systems - Google Patents

Improvements in or relating to long distance telephony systems

Info

Publication number
GB514099A
GB514099A GB265138A GB265138A GB514099A GB 514099 A GB514099 A GB 514099A GB 265138 A GB265138 A GB 265138A GB 265138 A GB265138 A GB 265138A GB 514099 A GB514099 A GB 514099A
Authority
GB
United Kingdom
Prior art keywords
relating
long distance
telephony systems
jan
distance telephony
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
GB265138A
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 AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 AG filed Critical Siemens and Halske AG
Publication of GB514099A publication Critical patent/GB514099A/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
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Tyre Moulding (AREA)
  • Credit Cards Or The Like (AREA)
  • Tires In General (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

514,099. Volume controlling systems. SIEMENS & HALSKE AKT.-GES. Jan. 27, 1938, No. 2651. Void. Convention date, Jan. 30, 1937. [Class 40 (iv)] When a connection has been established over a number of junctions in tandem, each junction having means whereby its attenuation is kept constant, a pilot current is sent over the connection and controls a volume indicating or volume controlling device at the receiving end.
GB265138A 1937-01-31 1938-01-27 Improvements in or relating to long distance telephony systems Expired GB514099A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES125883D DE718894C (en) 1937-01-31 1937-01-31 Device for automatic level control in a long-distance telephone system, in particular a carrier current system

Publications (1)

Publication Number Publication Date
GB514099A true GB514099A (en) 1939-10-30

Family

ID=25944985

Family Applications (1)

Application Number Title Priority Date Filing Date
GB265138A Expired GB514099A (en) 1937-01-31 1938-01-27 Improvements in or relating to long distance telephony systems

Country Status (2)

Country Link
DE (1) DE718894C (en)
GB (1) GB514099A (en)

Also Published As

Publication number Publication date
DE718894C (en) 1942-03-24

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