GB269834A - Improvements in or relating to television or like systems and apparatus - Google Patents

Improvements in or relating to television or like systems and apparatus

Info

Publication number
GB269834A
GB269834A GB690327A GB690327A GB269834A GB 269834 A GB269834 A GB 269834A GB 690327 A GB690327 A GB 690327A GB 690327 A GB690327 A GB 690327A GB 269834 A GB269834 A GB 269834A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
apparatus
cells
band
receiving
transmitting
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
GB690327A
Original Assignee
John Logie Baird
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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/04Synchronising

Abstract

269,834. Baird, J. L. Oct. 21, 1925. Television; synchronous movements. - Synchronism is maintained in a television system by the use at the receiving station of an image transmitted or controlled from the transmitting apparatus, such image being separate and of markedly different intensity from the picture being transmitted. In one receiving arrangement, Fig. 1, there is produced along one edge of the reproduced picture 11 a highly illuminated band 12 corresponding to a luminous object such as a lamp filament at the transmitting station, and during synchronous running the band 12 is disposed between light-sensitive cells 13, 14. Any divergence from synchronism produces movement of the band to activate one cell or the other according to the direction of the divergence, and the resulting current is employed to act upon an amplifying and controlling device 15 or 16 to accelerate or retard the receiving apparatus 17. In another arrangement, Fig. 2, a lamp 20, flashed intermittently under the con. trol of a periodic synchronizing impulse from the transmitting apparatus, co-operates with radial slots in a disc 22 driven from the receiving apparatus to produce on a screen 24 a band of illumination 25 coacting with two light-sensitive cells 26, 27. Alternatively the disc 22 may be replaced by a rotating mirror. The distance between the cells 13 and 14 or 26 and 27 may be adjusted. The two cells may be replaced by a single cell positioned so that half of its area from one edge is illuminated during synchronous running.
GB690327A 1925-10-21 1925-10-21 Improvements in or relating to television or like systems and apparatus Expired GB269834A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB690327A GB269834A (en) 1925-10-21 1925-10-21 Improvements in or relating to television or like systems and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB690327A GB269834A (en) 1925-10-21 1925-10-21 Improvements in or relating to television or like systems and apparatus

Publications (1)

Publication Number Publication Date
GB269834A true true GB269834A (en) 1927-04-21

Family

ID=9822924

Family Applications (1)

Application Number Title Priority Date Filing Date
GB690327A Expired GB269834A (en) 1925-10-21 1925-10-21 Improvements in or relating to television or like systems and apparatus

Country Status (1)

Country Link
GB (1) GB269834A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543066A (en) * 1947-02-01 1951-02-27 Farnsworth Res Corp Automatic picture phasing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543066A (en) * 1947-02-01 1951-02-27 Farnsworth Res Corp Automatic picture phasing circuit

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