GB521559A - Improvements relating to carrier transmission systems - Google Patents

Improvements relating to carrier transmission systems

Info

Publication number
GB521559A
GB521559A GB33583/38A GB3358338A GB521559A GB 521559 A GB521559 A GB 521559A GB 33583/38 A GB33583/38 A GB 33583/38A GB 3358338 A GB3358338 A GB 3358338A GB 521559 A GB521559 A GB 521559A
Authority
GB
United Kingdom
Prior art keywords
transmission systems
carrier transmission
improvements relating
control
carrier
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
GB33583/38A
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.)
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
Publication of GB521559A publication Critical patent/GB521559A/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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

521,559. Volume control. STANDARD TELEPHONES & CABLES, Ltd., and JACOBSEN, B. B: Nov. 18, 1938, No. 33583. [Class 40 (iv)] In a carrier-wave transmission system, control of a gain-adjuster or level indicator is effected by the sum or difference frequency current derived from two pilot currents which preferably 'differ in frequency by a small amount, e.g., 15 or 30 cycles. Preferably the pilots are filtered from the main transmission and fed to a bridge rectifier or other device having a square law. The control circuit may be coupled to the transmission line by means of a hybred coil or like arrangement such as that employed for coupling the negative feedback path to the amplifier described in Specification 506,791.
GB33583/38A 1938-11-18 1938-11-18 Improvements relating to carrier transmission systems Expired GB521559A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB231367X 1938-11-18

Publications (1)

Publication Number Publication Date
GB521559A true GB521559A (en) 1940-05-24

Family

ID=10190735

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33583/38A Expired GB521559A (en) 1938-11-18 1938-11-18 Improvements relating to carrier transmission systems

Country Status (4)

Country Link
BE (1) BE437073A (en)
CH (1) CH231367A (en)
FR (1) FR861689A (en)
GB (1) GB521559A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9716521B2 (en) 2015-04-17 2017-07-25 Telefonaktiebolaget Lm Ericsson (Publ) Optimization of automatic gain control for narrow bandwidth operation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9716521B2 (en) 2015-04-17 2017-07-25 Telefonaktiebolaget Lm Ericsson (Publ) Optimization of automatic gain control for narrow bandwidth operation
US11239871B2 (en) 2015-04-17 2022-02-01 Telefonaktiebolaget Lm Ericsson (Publ) Optimization of automatic gain control for narrow bandwidth operation
US11901926B2 (en) 2015-04-17 2024-02-13 Telefonaktiebolaget Lm Ericsson (Publ) Optimization of automatic gain control for narrow bandwidth operation

Also Published As

Publication number Publication date
CH231367A (en) 1944-03-15
BE437073A (en)
FR861689A (en) 1941-02-14

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