GB422824A - Improvements in and relating to signalling systems, such for example as television systems - Google Patents

Improvements in and relating to signalling systems, such for example as television systems

Info

Publication number
GB422824A
GB422824A GB1052234A GB1052234A GB422824A GB 422824 A GB422824 A GB 422824A GB 1052234 A GB1052234 A GB 1052234A GB 1052234 A GB1052234 A GB 1052234A GB 422824 A GB422824 A GB 422824A
Authority
GB
United Kingdom
Prior art keywords
signals
synchronizing signals
picture
television
osborne
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
GB1052234A
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.)
HILDA EMILY FLORENCE OSBORNE
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
HILDA EMILY FLORENCE OSBORNE
EMI Ltd
Electrical and Musical Industries 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
Priority to BE402568D priority Critical patent/BE402568A/xx
Application filed by HILDA EMILY FLORENCE OSBORNE, EMI Ltd, Electrical and Musical Industries Ltd filed Critical HILDA EMILY FLORENCE OSBORNE
Priority to GB11204/33A priority patent/GB422906A/en
Priority to GB1052234A priority patent/GB422824A/en
Priority to DEE2315D priority patent/DE939510C/en
Priority to US720205A priority patent/US2252746A/en
Priority to FR771789D priority patent/FR771789A/en
Publication of GB422824A publication Critical patent/GB422824A/en
Priority to US376827A priority patent/US2307249A/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
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals

Abstract

422,824. Television. ELECTRIC & MUSICAL INDUSTRIES, Ltd., Blyth Road, Hayes, Middlesex, WILLANS, P. W., 18, Park Hill Road, Hampstead, London, PERCIVAL, W. S., 6, York Mansions, York Avenue, Hanwell, WHITE, E. L. C., 18, The Drive, Hillingdon, both in Middlesex, and OSBORNE, H. E. F., (Representative of OSBORNE, C. P.), 56, Alcester Street, Devonport. April 13, 1933, Nos. 10522 /34 (divided out of 422,906), and 3945/34. [Class 40 (iii)] The circuits of a television system are such that the amplitude of the separated synchronizing signals is unaffected by changes in the average intensity of the picture signals. At the transmitter a direct-current amplifier is used, or, if an ordinary amplifier is used, the lost direct-current component is re-inserted by a circuit described in Specification 422,906 and based on the fact that the synchronizing signals, which exceed the signals corresponding to black in the picture, are of constant amplitude, Figs. 1-7 (not shown). At the receiver the anode of a detecting pentode 48 is connected directly to the grid of a valve 59. The potentials supplied to the valves from potentiometers 49, 53, are such that the valve 59 passes current only in response to the synchronizing signals. The line-control signals are separated from the framing impulses by a filter 62 and control a saw-tooth oscillator 67. According to a modification, separate detectors are used for the picture and synchronizing signals, each designed to operate on the appropriate amplitudes, Fig. 9 (not shown). The saw-tooth oscillations are generated by gas-discharge tubes as described in Specification 400,976. Specification 413,561 also is referred to.
GB1052234A 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems Expired GB422824A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE402568D BE402568A (en) 1933-04-13
GB11204/33A GB422906A (en) 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems
GB1052234A GB422824A (en) 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems
DEE2315D DE939510C (en) 1933-04-13 1934-04-10 Circuit arrangement for reintroducing the direct current component lost during transmission into the composite picture signal in television systems
US720205A US2252746A (en) 1933-04-13 1934-04-12 Television device
FR771789D FR771789A (en) 1933-04-13 1934-04-12 Improvements to signaling systems, such as those for television
US376827A US2307249A (en) 1933-04-13 1941-01-31 Television device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1052234A GB422824A (en) 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems

Publications (1)

Publication Number Publication Date
GB422824A true GB422824A (en) 1935-01-14

Family

ID=9969368

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1052234A Expired GB422824A (en) 1933-04-13 1933-04-13 Improvements in and relating to signalling systems, such for example as television systems

Country Status (1)

Country Link
GB (1) GB422824A (en)

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