GB532180A - Improvements in or relating to modulator circuits suitable for use in facsimile and like telegraph systems - Google Patents

Improvements in or relating to modulator circuits suitable for use in facsimile and like telegraph systems

Info

Publication number
GB532180A
GB532180A GB23925/39A GB2392539A GB532180A GB 532180 A GB532180 A GB 532180A GB 23925/39 A GB23925/39 A GB 23925/39A GB 2392539 A GB2392539 A GB 2392539A GB 532180 A GB532180 A GB 532180A
Authority
GB
United Kingdom
Prior art keywords
tone
pull
push
output
taken
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
GB23925/39A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB532180A publication Critical patent/GB532180A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • H04N5/40—Modulation circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00095—Systems or arrangements for the transmission of the picture signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimiles In General (AREA)
  • Amplifiers (AREA)

Abstract

532,180. Valve modulating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Aug. 18, 1939, No. 23925. Convention date, Aug. 31, 1938. [Classes 40 (iii) and 40 (v)] A facsimile or like signal transmission system comprises a pair of double-grid valves with the signal applied in parallel to one grid of each valve, and the tone or carrier frequency applied in push-pull to the other grids, the output being taken in push-pull from the anodes, and combined in the load circuit with tone or carrier frequency directly applied thereto. A light beam reflected from the picture is projected on the light-sensitive cathode 13 of an electron-multiplier 15, the output voltage being taken either from the last secondary-emitter 21 or from the final anode 23. The output is applied in parallel to the inner grids of two pentode valves 37, 38, the screen grids of which are coupled in pushpull to a source 43 of tone or carrier frequency. The modulated output is taken in push-pull from the anodes and is fed to an amplifier 55, which is also fed with unmodulated carrier through a phase-adjusting circuit 61, 62.
GB23925/39A 1938-08-31 1939-08-18 Improvements in or relating to modulator circuits suitable for use in facsimile and like telegraph systems Expired GB532180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227644A US2252752A (en) 1938-08-31 1938-08-31 Modulating and amplifying system

Publications (1)

Publication Number Publication Date
GB532180A true GB532180A (en) 1941-01-20

Family

ID=22853908

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23925/39A Expired GB532180A (en) 1938-08-31 1939-08-18 Improvements in or relating to modulator circuits suitable for use in facsimile and like telegraph systems

Country Status (2)

Country Link
US (1) US2252752A (en)
GB (1) GB532180A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457787A (en) * 1944-06-02 1948-12-28 Farnsworth Res Corp Potential divider
US2541187A (en) * 1947-11-13 1951-02-13 Picker X Ray Corp Waite Mfg Photoelectric timer for x-ray apparatus
US2541060A (en) * 1948-05-18 1951-02-13 Faximile Inc Tone and density compensating device
US2561219A (en) * 1950-03-21 1951-07-17 Alden Products Co Photoelectric modulator
US3244890A (en) * 1963-03-22 1966-04-05 Bell Telephone Labor Inc Photosensitive broadband coupler using wave guide

Also Published As

Publication number Publication date
US2252752A (en) 1941-08-19

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