GB460721A - Improvements in or relating to television and like systems - Google Patents

Improvements in or relating to television and like systems

Info

Publication number
GB460721A
GB460721A GB22303/35A GB2230335A GB460721A GB 460721 A GB460721 A GB 460721A GB 22303/35 A GB22303/35 A GB 22303/35A GB 2230335 A GB2230335 A GB 2230335A GB 460721 A GB460721 A GB 460721A
Authority
GB
United Kingdom
Prior art keywords
picture
frequency
alternating current
light
modulates
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
GB22303/35A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB22303/35A priority Critical patent/GB460721A/en
Priority to US93891A priority patent/US2182043A/en
Priority to FR812117D priority patent/FR812117A/en
Publication of GB460721A publication Critical patent/GB460721A/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
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/36—Scanning of motion picture films, e.g. for telecine

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

460,721. Television. WALTON, G. W. Aug. 7, 1935, No. 22303. [Class 40 (iii)] The average light intensity of the picture 1 modulates an alternating current of a frequency which does not produce a visible effect on the image. The frequency is AB/C, where A is the picture frequency, and B and C are whole numbers such that B is not a multiple of C, as described in Specification 379,552. For example the frequency is a multiple plus one-half of the picture frequency. The output from a light-sensitive cell 9, which is influenced by light from the whole picture, modulates an alternating current, which is generated by a generator 11 run in synchronism with the scanning-device 2. Alternatively, the light falling on the cell 9 is interrupted periodically by a rotating disc with a ring of apertures, each with a transparency which varies sinusoidally in the direction of rotation, Fig. 3 (not shown). At the receiver, Fig. 2, the mixed currents are fed to two parallel circuits, one of which is coupled to means 17, which reconstitute the picture, while the other has a filter 20 for selecting the alternating current, and a rectifier 21. Part of the rectified output across an impedance 23 varies the grid bias of a valve in an amplifier 16 for the picture signals.
GB22303/35A 1935-08-07 1935-08-07 Improvements in or relating to television and like systems Expired GB460721A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB22303/35A GB460721A (en) 1935-08-07 1935-08-07 Improvements in or relating to television and like systems
US93891A US2182043A (en) 1935-08-07 1936-08-01 Television and like system
FR812117D FR812117A (en) 1935-08-07 1936-08-07 Improvements to television and analog systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22303/35A GB460721A (en) 1935-08-07 1935-08-07 Improvements in or relating to television and like systems

Publications (1)

Publication Number Publication Date
GB460721A true GB460721A (en) 1937-02-03

Family

ID=10177195

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22303/35A Expired GB460721A (en) 1935-08-07 1935-08-07 Improvements in or relating to television and like systems

Country Status (3)

Country Link
US (1) US2182043A (en)
FR (1) FR812117A (en)
GB (1) GB460721A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965711A (en) * 1955-11-24 1960-12-20 Emi Ltd Apparatus for correcting for transmission variations in television and other signal transmission systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH332844A (en) * 1954-11-10 1958-09-30 Hell Rudolf Dr Ing Fa Process for the production of screened clichés with automatic tonal value correction and device for carrying out the process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965711A (en) * 1955-11-24 1960-12-20 Emi Ltd Apparatus for correcting for transmission variations in television and other signal transmission systems

Also Published As

Publication number Publication date
FR812117A (en) 1937-04-30
US2182043A (en) 1939-12-05

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