GB470158A - Automatic phase distortion correcting system for carrier wave signalling systems - Google Patents

Automatic phase distortion correcting system for carrier wave signalling systems

Info

Publication number
GB470158A
GB470158A GB34857/36A GB3485736A GB470158A GB 470158 A GB470158 A GB 470158A GB 34857/36 A GB34857/36 A GB 34857/36A GB 3485736 A GB3485736 A GB 3485736A GB 470158 A GB470158 A GB 470158A
Authority
GB
United Kingdom
Prior art keywords
phase
frequencies
television
pilot
distortion
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
GB34857/36A
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 GB470158A publication Critical patent/GB470158A/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)
  • Filters And Equalizers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Radio Relay Systems (AREA)

Abstract

470,158. Automatic control systems. STANDARD TELEPHONES & CABLES, Ltd. Dec. 18, 1936, No. 34857. Convention date, Feb. 21. [Class 38 (iv)] [Also in Groups XXXIX and XL] Phase displacement.- Variations in phase distortion in the transmission of a wide band of frequencies, e.g. for television, due to temperature &c. changes are automatically compensated by the transmission of pilot currents subject to the same conditions. In the system shown two pilot frequencies f<1>, f<2> on either side of the television band and both harmonics of the same generator 10 are transmitted over the television cable 12 and are separated at an intermediate or receiving repeater by filters 17, 18. The lower frequency f<1> is stepped up by a harmonic generator HG2 and filter 19 to the other frequency f<2> and the two pilot signals, differing now only in phase, are applied to a thermocouple 23 controlling through a biassed double-contact relay 24 a reversible motor 25. By suitable adjustment of a phase-shifter 20 it is arranged that normally a certain number of the phase-distortion-equalizing sections PS0 ... PS3 are inserted, the number being increased or decreased according as the relay of low frequencies relative to high frequencies increases or decreases.
GB34857/36A 1936-02-21 1936-12-18 Automatic phase distortion correcting system for carrier wave signalling systems Expired GB470158A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US470158XA 1936-02-21 1936-02-21

Publications (1)

Publication Number Publication Date
GB470158A true GB470158A (en) 1937-08-10

Family

ID=21946599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34857/36A Expired GB470158A (en) 1936-02-21 1936-12-18 Automatic phase distortion correcting system for carrier wave signalling systems

Country Status (3)

Country Link
DE (1) DE750127C (en)
FR (1) FR820549A (en)
GB (1) GB470158A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157133A (en) * 1984-04-05 1985-10-16 Philips Electronic Associated Closed circuit television system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1511013A (en) * 1920-07-08 1924-10-07 American Telephone & Telegraph Equalization of carrier transmissions
US1709037A (en) * 1924-06-28 1929-04-16 American Telephone & Telegraph Distortion compensator
US1645618A (en) * 1926-02-25 1927-10-18 American Telephone & Telegraph Method and apparatus for measuring transmission delay
US1743132A (en) * 1928-01-28 1930-01-14 American Telephone & Telegraph Equalization of carrier systems
GB394712A (en) * 1932-01-01 1933-07-03 Marconi Wireless Telegraph Co Improvements in or relating to variable attenuation devices suitable for use in connection with thermionic amplifiers
FR787773A (en) * 1934-03-23 1935-09-28 Thomson Houston Comp Francaise Improvements to cathode ray devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157133A (en) * 1984-04-05 1985-10-16 Philips Electronic Associated Closed circuit television system

Also Published As

Publication number Publication date
FR820549A (en) 1937-11-13
DE750127C (en) 1944-12-14

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