GB504460A - Production of synchronising impulses in a television transmitter - Google Patents

Production of synchronising impulses in a television transmitter

Info

Publication number
GB504460A
GB504460A GB29072/37A GB2907237A GB504460A GB 504460 A GB504460 A GB 504460A GB 29072/37 A GB29072/37 A GB 29072/37A GB 2907237 A GB2907237 A GB 2907237A GB 504460 A GB504460 A GB 504460A
Authority
GB
United Kingdom
Prior art keywords
impulses
line
framing
valve
signals
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
GB29072/37A
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
Publication of GB504460A publication Critical patent/GB504460A/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
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/0675—Arrangements or circuits at the transmitter end for mixing the synchronising signals with the picture signal or mutually
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Endoscopes (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Details Of Television Scanning (AREA)

Abstract

504,460. Television. RADIOAKT.-GES. D. S. LOEWE. Oct. 25, 1937, No. 29072. Convention date, Oct. 26, 1936. [Class 40 (iii)] Line-synchronizing impulses 6 are suppressed during, and a short time 9 before, each framing impulse 10 in order to prevent interference between the impulses at the receiver: The line and framing impulses have the same amplitude but different durations, and the interval between the line impulses is at least the period of one line. The line impulses generated by a valve 21 are suppressed when framing impulses are applied to that valve from a framing generator 22. The impulses are mixed in a valve 5 with two grids, to which the respective impulses are applied to suppress the anode current. By reducing the framing impulses by a potentiometer 18, the time of suppression 10 in the valve 5 is made less than the time of suppression 8 in the valve 21. Alternatively, the synchronizing signals are generated by a light syren, the line impulses are interrupted by cutting off the light by a shutter, and the framing impulse is derived from this modulation of the line signals by rectification, as described in Specification 471,286. The rectifier has so great an inertia that the framing signal does not begin until the line signals have faded, and the duration of the framing signal is so shortened by biassing or by division of the potential as to last for less than the period of the interruption.
GB29072/37A 1936-09-05 1937-10-25 Production of synchronising impulses in a television transmitter Expired GB504460A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE487560X 1936-09-05
DEL7408D DE1033257B (en) 1936-09-05 1936-10-26 Method for mixing picture change and line pulses in television

Publications (1)

Publication Number Publication Date
GB504460A true GB504460A (en) 1939-04-25

Family

ID=41349324

Family Applications (2)

Application Number Title Priority Date Filing Date
GB24290/37A Expired GB487560A (en) 1936-09-05 1937-09-06 Television transmitter
GB29072/37A Expired GB504460A (en) 1936-09-05 1937-10-25 Production of synchronising impulses in a television transmitter

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB24290/37A Expired GB487560A (en) 1936-09-05 1937-09-06 Television transmitter

Country Status (7)

Country Link
US (2) US2248549A (en)
BE (1) BE423429A (en)
CH (2) CH199610A (en)
DE (1) DE1033257B (en)
FR (2) FR826231A (en)
GB (2) GB487560A (en)
NL (1) NL58560C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416424A (en) * 1939-03-16 1947-02-25 Hazeltine Research Inc Synchronizing-signal separator
US2883659A (en) * 1942-03-18 1959-04-21 Sylvania Electric Prod Timing and phase-control circuits
US2485665A (en) * 1943-07-16 1949-10-25 Sperry Corp Mixing circuit
US2572849A (en) * 1945-01-04 1951-10-30 Oliver T Francis Vacuum tube impulse pattern producer
US2508923A (en) * 1946-06-27 1950-05-23 Rca Corp Synchronizing system
FR959234A (en) * 1947-12-26 1950-03-25
US2561817A (en) * 1950-02-02 1951-07-24 Avco Mfg Corp Automatic frequency control circuit
FR1407806A (en) * 1964-06-25 1965-08-06 Thomson Houston Comp Francaise Improvements to television cameras

Also Published As

Publication number Publication date
GB487560A (en) 1938-06-22
FR828271A (en) 1938-05-13
NL58560C (en) 1946-12-16
DE1033257B (en) 1958-07-03
BE423429A (en) 1937-10-30
US2248549A (en) 1941-07-08
CH219593A (en) 1942-02-15
FR826231A (en) 1938-03-25
CH199610A (en) 1939-08-31
US2227023A (en) 1940-12-31

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